src/graphics, src/ui: now capable of generating multiple GLArea and their stack

Users/contributors have to run guix shell -m manifest in order
to build the project

.gitignore

@@ -0,0 +1,3 @@
+**/tags.*
+bin/*
+build/*

LICENSE

@@ -0,0 +1,661 @@
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

Makefile

@@ -0,0 +1,132 @@
+##
+##      Gem-graph OpenGL experiments
+##
+##      Desc: Makefile
+##
+##  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+##  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+##
+##  This file is part of Gem-graph.
+##
+##  This program is free software: you can redistribute it and/or modify
+##  it under the terms of the GNU Affero General Public License as published by
+##  the Free Software Foundation, either version 3 of the License, or
+##  (at your option) any later version.
+##
+##  This program is distributed in the hope that it will be useful,
+##  but WITHOUT ANY WARRANTY; without even the implied warranty of
+##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+##  GNU Affero General Public License for more details.
+##
+##  You should have received a copy of the GNU Affero General Public License
+##  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+.PHONY: all clean install run build_system
+.DELETE_ON_ERROR: $(BINDIR)/gem-graph-client
+.DEFAULT_GOAL := all
+
+#
+# Color codes
+#
+CL='\033[0;32m'
+CL2='\033[1;36m'
+CL3='\033[0m'
+NC='\033[1;37m'
+
+#
+# Variables & constants
+#
+NTHREADS= $(shell nproc)
+
+CC=gcc
+WARNINGS= -Wall
+DEBUG= -ggdb -fno-omit-frame-pointer -fdiagnostics-color=always -fsanitize=bounds -fstack-check
+	#-fsanitize=address \
+	#-fsanitize=pointer-compare -fsanitize=pointer-subtract \
+	#-fsanitize=leak -fsanitize=undefined -fsanitize=null -fsanitize=bounds
+OPTIMIZE= -O3
+INCLUDE= $(shell pkg-config --cflags glib-2.0 libxml-2.0 gtk4)
+LIBS= $(shell pkg-config --libs glib-2.0 libxml-2.0 gtk4) -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
+
+BINDIR=bin
+BUILDDIR=build
+SRCDIR=src
+#vpath %.c $(SRCDIR)
+
+SOURCES= $(shell find $(SRCDIR) -type f -name "*.c")
+BUILDBINS=$(patsubst %.c,$(BUILDDIR)/%.o,$(SOURCES))
+BUILDDEPS=$(patsubst %.c,$(BUILDDIR)/%.d,$(SOURCES))
+
+-include /etc/os-release
+
+#
+# Directories
+#
+$(BUILDDIR):
+	@mkdir -p $@
+	@echo -e ${CL2}[$@] ${CL}folder generated.${CL3}
+
+$(BINDIR):
+	@mkdir -p $@
+	@echo -e ${CL2}[$@] ${CL}folder generated.${CL3}
+
+#
+# Dependencies
+#
+-include $(BUILDDEPS)
+
+$(BUILDDIR)/%.d: %.c | $(BUILDDIR)
+	@mkdir -p $(shell dirname $@)
+	@$(CC) -MM -MT $(@:%.d=%.o) -MF $@ $<
+	@echo -e ${CL2}[$@] ${CL}dependencies generated.${CL3}
+
+#
+# Compilation
+#
+$(BINDIR)/gem-graph-client: $(BUILDBINS) | $(BINDIR)
+	@$(CC) -o $@ $(WARNINGS) $(DEBUG) $(OPTIMIZE) $^ $(INCLUDE) $(LIBS)
+	@echo -e ${CL2}[$@] ${CL}built.${CL3}
+
+
+$(BUILDDIR)/%.o: %.c | $(BUILDDIR)
+	@mkdir -p $(shell dirname $@)
+	@$(CC) $(WARNINGS) $(DEBUG) $(OPTIMIZE) $(INCLUDE) -c $< -o $@
+	@echo -e ${CL2}[$@] ${CL}compiled.${CL3}
+
+
+#
+# Virtual recipes
+#
+clean:
+	@rm -rf $(BINDIR)
+	@rm -rf $(BUILDDIR)
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+install:
+	echo "Installing is not supported"
+
+build_system:
+	@echo -e ${CL2}[$@] ${CL}building...${CL3}
+	@make $(BINDIR)/gem-graph-client -j $(NTHREADS)
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+run: build_system
+	@echo -e ${CL2}[$@] ${CL}executing...${CL3}
+	@$(BINDIR)/gem-graph-client
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+debug: build_system
+	@echo -e ${CL2}[$@] ${CL}executing...${CL3}
+	@gdb $(BINDIR)/gem-graph-client
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+valgrind: build_system
+	@echo -e ${CL2}[$@] ${CL}executing...${CL3}
+	@valgrind $(BINDIR)/gem-graph-client
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+all:	build_system
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
+

TODO (next version).txt

@@ -0,0 +1,46 @@
+L'utilisation d'OpenGL fait que la première version de Gem-graph sera tout naturellement en 3D. Le modèle de marche aléatoire de dimères sera aussi facile à y réaliser que dans un modèle 1D (on pourrait même se servir d'une seule règle au lieu de deux !) (mais deux règles permettront un meilleur rendu).
+
+Modifier la forme des flèches ? 
+Pour cette première version, la forme "central star" + "cône" a l'avantage de la simplicité.
+La "central star" de chaque cube est commune aux six flèches possibles qui sont orientées chacune vers une face différente.
+Dans la version actuelle, elle est redessinée si plusieurs flèches sont dans le même cube.
+Ce dessin est peu coûteux (deux lignes superposées pour chaque nouvelle flèche)
+et ce cas (plusieurs flèches dans le même cube) sera peu fréquent dans les premiers modèles développés. Mais... TODO
+
+Le plus simple serait un trait allant du centre d'un cube au centre d'une de ses faces. Ce serait peu lisible pour des objets mais pourrait avoir un intérêt pour les tags (balises) éventuellement associés aux objets ou situations. Ces tags seraient machine-readable. Nécessairement. Seraient-ils human-readable aussi ? Ce serait idéal ! A inventer ou essayer, en tout cas. 
+Un seul trait aurait sûrement un intérêt dans la représentation de voisinages de Moore 3D (Je préfère ne pas imaginer ça pour l'instant !  Il va falloir choisir de ne représenter ou de ne visualiser qu'une partie des connexions à la fois...).
+
+Le premier objectif des versions à venir est l'extension du voisinage. Un voisinage type von Neumann 3D - le plus simple possible si on le veut symétrique par rapport aux axes de l'espace - est tout à fait indiqué pour cette première version. Mais les versions à venir devraient travailler en priorité avec des voisinages type Moore 3D approximativement spériques de rayon proche de celui de l'espace local. 
+Par ailleurs, Gem-graph ne peut avoir sa puissance théorique maximale que s'il peut utiliser un voisinage étendu à tout l'espace. Mais cette puissance est vraisemblablement inutile, sauf pour les démonstrations mathématiques d'équivalence avec les automates cellulaires, par exemple, ou d'autres formalismes.
+Par ailleurs, il est d'ores et déjà possible d'utiliser pleinement le "poids" (weight) ou la "charge" (load) des flèches.
+
+! WARNING !   J'ai inversé pôle Nord et pôle Sud. Et c'est à corriger, je pense. 👀️
+Ce sera une convention, bien sûr. Mais comment la choisir ? J'ai imaginé superposer repère orthonormé et repère géodésique. 
+Si je regarde un repère orthonormé 3D:
+les +x sont à ma droite, les -x à ma gauche  (Est - Ouest)
+les +y en haut, les -y en bas   (Zénith - Nadir)   et...  si l'axe des z vient vers moi,
+les +z sont derrière moi et les -z devant.   Donc les -z sont au Nord (que je regarde) et les +z sont au Sud.
+
+Les vertex situés aux intersections des "grilles" (X-X, Y-Y et Z-Z) sont-ils utiles ?
+Ils le seraient si ses cubes individuels étaient coloriés ou soulignés pour mettre en valeur des flèches qu'ils contiennent ou d'autres particularités.
+Mais tant qu'il n'est pas possible de rendre sélectivement transparentes les parois de cubes individuels (ou de tel ou tel objet dessiné par les flèches), cette fonction est inutilisable et les vertex situés aux intersections des grilles sont donc inutiles.
+On pourrait ne garder que ceux situés sur les faces de l'espace qui, eux, servent à tracer les grilles X-X, Y-Y et Z-Z.
+Le nombre de vertex de l'espace serait alors de 12 par cube-unité (soit 12 * x * y * z) plus les vertex intersections des seules faces de l'espace (soit (x * y + x * z + y * z) * 2). 
+A raison, bien sûr de trois nombres par vertex plus les couleurs.
+
+Je comprends (maintenant seulement !) que si des régions du buffer lignes (idem pour le buffer triangles) sont laissées vides (occupées par des zéros) elles seront néanmoins redessinées en permanence et que le seul moyen d'éviter cela est de réallouer la taille du buffer à chaque délétion ou chaque ajout de flèche.
+
+Néanmoins, lorsque le nombre de flèches présent dans l'espace est invariant, - cas de mes premiers modèles - il peut être avantageux de travailler dans un buffer de taille fixe. Il faut, pour cela, fixer une "densité maximale de flèches dans l'espace" nécessairement arbitraire. 
+Bien que ce nombre reste toujours arbitraire, on peut estimer que certaines de ses valeurs seront plus utiles/utilisables que d'autres :
+- un espace totalement vide ou totalement saturé ne pourrait rien représenter
+- un espace trop vide ou trop plein (à définir - c'est intuitif) aurait peu de chances de représenter des phénomènes intéressants. La marche aléatoire d'un seul ou de quelques dimères dans un grand espace, par exemple, servira plus de test pour le bon fonctionnement de Gem-graph que de modèle d'étude.
+- on peut considérer un espace rempli de flèches aux 2/3 comme équivalent à un espace repli au tiers (1/3) mais où les flèches seraient écrites "en creux" et, par conséquent, moins lisibles. Inutile, donc, de remplir plus de la moitié de l'espace. 
+D'expérience,
+- les densités de l'ordre du tiers (1/3 des unités de l'espace occupées par au moins une flèche) suffisent à représenter un nombre de phénomènes tel qu'il n'est pas nécessaire, au moins dans un premier temps, de prévoir davantage (mais des réalloc sont toujours possibles) et les densités trop fortes sont peu lisibles.
+Un buffer lignes pourrait donc avoir une taille fixe qui serait calculée selon les paramètres suivants :
+-   x * y * z = nombre de cubes
+-   nombre de flèches moyen par cube  = 2   (il s'agit d'un nombre "moyen" qui surestime très probablement le nombre de flèches utilisé par la plupart des modèles)
+-   dessin d'une flèche seule dans un cube = 3 + 4 traits (soit 14 nombres)
+Faut-il coder cette option ?
+
+

data/hicolor/apps/scalable/gemgraph.svg

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+  </g>
+</svg>

data/models/dimers random walk.xml

@@ -0,0 +1,118 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gem-graph-model version="0.2.1">
+
+    <identity>
+       <name>Modèle de test</name>
+
+       <owner>Léontine Patinette</owner>
+
+       <owner_id>2</owner_id>
+
+       <date>1630000000</date>
+
+       <version>1.0</version>
+
+       <g_ref id="Cause" date="1630000000" author="toujours" lang="en">Ref</g_ref>
+    </identity>
+
+    <parameters id="texte" date="0" author="Léontine Trottine.">
+        <simulation>
+            <max_thread>0</max_thread>
+            <max_cycles>9</max_cycles>
+
+        </simulation>
+
+        <space-param>
+    <!-- loop_on_zero="true"  anything moved before zero reenters at the end of space-->
+    <!-- loop_on_zero="false" anything moved before zero is lost-->
+    <!-- loop_on_max="true"   anything moved beyond max reenters at the zero of space-->
+    <!-- loop_on_max="false"  anything moved beyond max is lost-->
+
+            <dimension x="29"/>
+
+            <!-- Site_multiplicity = number of  sites in a space unit. -->
+            <!-- Each site points towards a neighbouring space unit. -->
+            <!-- Several arrows can be stacked in the same site. -->
+
+            <site_multiplicity>3</site_multiplicity>
+
+        </space-param>
+
+    </parameters>
+
+    <!-- Model objects definition -->
+
+    <objects id="only dimers in this model" date="1630000000" author="inanimés,... âme ?">
+        <object id="a dimer" date="1630000000" author="Alphonse">
+            <arrow site="1" weight="1" x="0"/>
+            <arrow site="2" weight="1" x="1"/>
+        </object>
+
+    </objects>
+
+
+    <!-- Saved space description (initial space is sequence 0) -->
+
+    <savedstates id="texte" date="1630000000" author="Qui courrait dans l'herbe'">
+        <state id="initial" date="1630000000" author="Une souris verte">
+            <arrow site="1" weight="1" x="0"/>
+            <arrow site="2" weight="1" x="1"/>
+            <arrow site="1" weight="1" x="10"/>
+            <arrow site="2" weight="1" x="11"/>
+            <arrow site="1" weight="1" x="20"/>
+            <arrow site="2" weight="1" x="21"/>
+
+          <!-- Three dimers 1-1 are drawn in the global space
+               at locations (0,1) (10,11) and (20,21) -->
+
+      </state>
+
+    </savedstates>
+
+    <!-- Model transitions definition (rules) -->
+    <!-- In this version : <xs:sequence minOccurs="0" maxOccurs="unbounded">-->
+    <!-- Transitions should be edited by hand and written in a 'human-readable' format -->
+
+    <conditions id="random walk of dimers" date="1630000000" author="Zazard le lézard !">
+
+        <condition site="1" weight="1" node_id="1" parent="0" x="0"/>
+        <condition site="2" weight="1" node_id="2" parent="1" x="1"/>
+        <!-- as soon as conditions 1 and 2 are satisfied, a dimer is identified at atation (0,1). -->
+
+        <condition site="1" weight="0" node_id="3" parent="2" x="2"/>
+        <!-- as soon as condition 3 is satisfied,
+             the neighbouring space unit to East of the dimer is empty
+             and the dimer identified by conditions (1,2)  can be moved to East. -->
+
+        <condition site="2" weight="0" node_id="4" parent="2" x="-1"/>
+        <!-- as soon as condition 4 is satisfied,
+             the neighbouring space unit to West of the dimer is empty
+             and  the dimer identified by conditions (1,2) can be moved to West. -->
+
+    </conditions>
+
+    <transitions>
+
+        <transition id="move_a_dimer_to_east" date="1630000000" author="Pas moi..."
+                  parent="3" probability="1">
+
+            <arrow site="1" weight="0" x="0"/>
+            <arrow site="2" weight="0" x="1"/>
+            <arrow site="1" weight="1" x="1"/>
+            <arrow site="2" weight="1" x="2"/>
+
+      </transition>
+
+      <transition id="move_a_dimer_to_west" date="1630000000" author="Ni moi !"
+                  parent="4" probability="1">
+
+            <arrow site="1" weight="0" x="0"/>
+            <arrow site="2" weight="0" x="1"/>
+            <arrow site="2" weight="1" x="0"/>
+            <arrow site="1" weight="1" x="1"/>
+
+      </transition>
+
+    </transitions>
+
+</gem-graph-model>

data/models/dimers_random_walk_recursif.xml

@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gem-graph-model version="0.2.1">
+
+    <identity>
+       <name>Test 21-03-2023</name>
+
+       <owner>J</owner>
+
+       <owner_id>J</owner_id>
+
+       <date>time_stamp</date>
+
+       <version>1.0</version>
+
+       <g_ref id="Cause" date="time_stamp" author="J" lang="en">Ref</g_ref>
+    </identity>
+
+    <parameters id="texte" date="0" author="J">
+        <simulation>
+            <max_thread>0</max_thread>
+            <max_cycles>9</max_cycles>
+
+        </simulation>
+
+        <space-param>
+    <!-- loop_on_zero="true"  anything moved before zero reenters at the end of space-->
+    <!-- loop_on_zero="false" anything moved before zero is lost-->
+    <!-- loop_on_max="true"   anything moved beyond max reenters at the zero of space-->
+    <!-- loop_on_max="false"  anything moved beyond max is lost-->
+
+            <dimension x="22" y="4" z="8"/>
+
+            <!-- Site_multiplicity = number of  sites in a space unit. -->
+            <!-- Each site points towards a neighbouring space unit. -->
+            <!-- Several arrows can be stacked in the same site. -->
+
+            <site_multiplicity>3</site_multiplicity>
+
+        </space-param>
+
+    </parameters>
+
+    <!-- Model objects definition -->
+
+    <objects id="only dimers in this model" date="time_stamp" author="J">
+        <object id="a dimer" date="time_stamp" author="J">
+            <arrow site="1" weight="1" x="0"/>
+            <arrow site="2" weight="1" x="1"/>
+        </object>
+
+    </objects>
+
+
+    <!-- Saved space description (initial space is sequence 0) -->
+
+    <savedstates id="texte" date="time_stamp" author="J">
+        <state id="initial" date="time_stamp" author="J">
+            <arrow site="1" weight="1" x="0"/>
+            <arrow site="2" weight="1" x="1"/>
+            <arrow site="1" weight="1" x="10"/>
+            <arrow site="2" weight="1" x="11"/>
+            <arrow site="1" weight="1" x="20"/>
+            <arrow site="2" weight="1" x="21"/>
+
+          <!-- Three dimers 1-1 are drawn in the global space
+               at locations (0,1) (10,11) and (20,21) -->
+
+      </state>
+
+    </savedstates>
+
+    <!-- Model transitions definition (rules) -->
+    <!-- In this version : <xs:sequence minOccurs="0" maxOccurs="unbounded">-->
+    <!-- Transitions should be edited by hand and written in a 'human-readable' format -->
+
+    <conditions_tree>
+        <condition_anonym site="1" weight="1" x="0">
+            <condition_anonym site="2" weight="1" x="1">
+                <condition_anonym site="1" weight="0" x="2">             
+                    <transition_anonym id="move_a_dimer_to_east" 
+                                date="time_stamp" 
+                                author="J"
+                                probability="0.5"/>
+                    <arrow site="1" weight="0" x="0"/>
+                    <arrow site="2" weight="0" x="1"/>
+                    <arrow site="1" weight="1" x="1"/>
+                    <arrow site="2" weight="1" x="2"/>
+                </condition_anonym>
+                <condition_anonym site="2" weight="0" x="-1">
+                    <transition_anonym id="move_a_dimer_to_west" 
+                                date="time_stamp" 
+                                author="J"
+                                probability="0.5"/>
+                    <arrow site="1" weight="0" x="0"/>
+                    <arrow site="2" weight="0" x="1"/>
+                    <arrow site="2" weight="1" x="0"/>
+                    <arrow site="1" weight="1" x="1"/>
+                </condition_anonym>
+            </condition_anonym>
+        </condition_anonym>
+    </conditions_tree>
+
+    <conditionslist id="random walk of dimers" date="time_stamp" author="J">
+
+        <condition site="1" weight="1" node_id="1" parent="0" x="0"/>
+        <condition site="2" weight="1" node_id="2" parent="1" x="1"/>
+        <!-- as soon as conditions 1 and 2 are satisfied, a dimer is identified at atation (0,1). -->
+
+        <condition site="1" weight="0" node_id="3" parent="2" x="2"/>
+        <!-- as soon as condition 3 is satisfied,
+             the neighbouring space unit to East of the dimer is empty
+             and the dimer identified by conditions (1,2)  can be moved to East. -->
+
+        <condition site="2" weight="0" node_id="4" parent="2" x="-1"/>
+        <!-- as soon as condition 4 is satisfied,
+             the neighbouring space unit to West of the dimer is empty
+             and  the dimer identified by conditions (1,2) can be moved to West. -->
+
+    </conditionslist>
+
+    <transitionslist>
+
+        <transition id="move_a_dimer_to_east" date="time_stamp" author="J"
+                  parent="3" probability="1">
+
+            <arrow site="1" weight="0" x="0"/>
+            <arrow site="2" weight="0" x="1"/>
+            <arrow site="1" weight="1" x="1"/>
+            <arrow site="2" weight="1" x="2"/>
+
+        </transition>
+
+        <transition id="move_a_dimer_to_west" date="time_stamp" author="J"
+                  parent="4" probability="1">
+
+            <arrow site="1" weight="0" x="0"/>
+            <arrow site="2" weight="0" x="1"/>
+            <arrow site="2" weight="1" x="0"/>
+            <arrow site="1" weight="1" x="1"/>
+
+        </transition>
+
+    </transitionslist>
+                             
+</gem-graph-model>

data/schemas/models_0.2.1.xmls

@@ -0,0 +1,194 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+<!-- https://www.freeformatter.com/xml-validator-xsd.html -->
+<xs:attribute name="id" type="xs:string"/>
+<xs:attribute name="node_id" type="xs:integer"/>
+<xs:attribute name="parent" type="xs:integer"/>
+<xs:attribute name="date" type="xs:integer"/>
+<xs:attribute name="name" type="xs:string"/>
+<xs:attribute name="lang" type="xs:string"/>
+<xs:attribute name="owner" type="xs:string"/>
+<xs:attribute name="owner_id" type="xs:integer"/>
+<xs:attribute name="author" type="xs:string"/>
+<xs:attribute name="version" type="xs:float"/>
+<xs:attribute name="probability" type="xs:integer"/>
+<xs:attribute name="site" type="xs:integer" default="0"/>
+<xs:attribute name="weight" type="xs:integer" default="0"/>
+<xs:attribute name="u" type="xs:integer"/>
+<xs:attribute name="v" type="xs:integer"/>
+<xs:attribute name="w" type="xs:integer"/>
+<xs:attribute name="x" type="xs:integer"/>
+<xs:attribute name="y" type="xs:integer"/>
+<xs:attribute name="z" type="xs:integer"/>
+<xs:attribute name="t" type="xs:integer"/>
+
+
+<xs:attributeGroup name="id_date_author">
+      <xs:attribute ref="id"/>
+      <xs:attribute ref="date"/>
+      <xs:attribute ref="author"/>
+</xs:attributeGroup>
+
+<xs:element name="g_ref">
+    <xs:complexType>
+        <xs:simpleContent>
+            <xs:extension base="xs:string">
+              <xs:attributeGroup ref="id_date_author"/>
+              <xs:attribute ref="lang" use="required"/>
+            </xs:extension>
+        </xs:simpleContent>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="quote" substitutionGroup="g_ref"/>
+
+<xs:element name="dimension">
+    <xs:complexType>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="optional"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="arrow">
+    <xs:complexType>
+        <xs:attribute ref="site" use="required"/>
+        <xs:attribute ref="weight" use="required"/>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="optional"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="condition">
+    <xs:complexType>
+        <xs:attribute ref="site" use="required"/>
+        <xs:attribute ref="weight" use="required"/>
+        <xs:attribute ref="node_id" use="required"/>
+        <xs:attribute ref="parent" use="required"/>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="optional"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="state">
+    <xs:complexType>
+    <xs:sequence minOccurs="1" maxOccurs="unbounded">
+        <xs:element ref="arrow"/>
+    </xs:sequence>
+    <xs:attributeGroup ref="id_date_author"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="object" substitutionGroup="state"/>
+
+<xs:element name="transition">
+    <xs:complexType>
+        <xs:sequence minOccurs="1" maxOccurs="unbounded">
+            <xs:element minOccurs="0" ref="quote"/>
+            <xs:element ref="arrow"/>
+        </xs:sequence>
+        <xs:attributeGroup ref="id_date_author"/>
+        <xs:attribute ref="parent" use="required"/>
+        <xs:attribute ref="probability" use="required"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="gem-graph-model">
+<xs:complexType>
+<xs:sequence minOccurs="1" maxOccurs="1">
+    <xs:element name="identity">
+        <xs:complexType>
+          <xs:sequence minOccurs="1" maxOccurs="1">
+              <xs:element name="name" type="xs:string"/>
+              <xs:element name="owner" type="xs:string"/>
+              <xs:element name="owner_id" type="xs:integer"/>
+              <xs:element name="date" type="xs:integer"/>
+              <xs:element name="version" type="xs:float"/>
+              <xs:element ref="g_ref" minOccurs="1" maxOccurs="1"/>
+          </xs:sequence>
+        </xs:complexType>
+    </xs:element>
+
+    <xs:element name="parameters">
+        <xs:complexType>
+        <xs:sequence minOccurs="1" maxOccurs="1">
+
+            <xs:element name="simulation">
+                <xs:complexType>
+                <xs:sequence minOccurs="1" maxOccurs="1">
+                    <xs:element name="max_thread" type="xs:integer"/>
+                    <xs:element name="max_cycles" type="xs:integer"/>
+                </xs:sequence>
+                </xs:complexType>
+            </xs:element>
+
+            <xs:element name="space-param">
+                <xs:complexType>
+                <xs:sequence minOccurs="1" maxOccurs="1">
+                    <xs:element ref="dimension"/>
+                    <xs:element name="site_multiplicity" type="xs:integer"/>
+              </xs:sequence>
+              </xs:complexType>
+          </xs:element>
+
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="objects">
+          <xs:complexType>
+          <xs:sequence minOccurs="1" maxOccurs="unbounded">
+              <xs:element ref="object"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="savedstates">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="state"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="conditions">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element minOccurs="0" ref="quote"/>
+              <xs:element ref="condition"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="transitions">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="transition"/>
+          </xs:sequence>
+          </xs:complexType>
+      </xs:element>
+
+</xs:sequence>
+<xs:attribute ref="version" use="required"/>
+</xs:complexType>
+</xs:element>
+</xs:schema>
+

data/schemas/models_0_recursif.2.1.xmls

@@ -0,0 +1,235 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+<!-- https://www.freeformatter.com/xml-validator-xsd.html -->
+<xs:attribute name="id" type="xs:string"/>
+<xs:attribute name="node_id" type="xs:integer"/>
+<xs:attribute name="parent" type="xs:integer"/>
+<xs:attribute name="date" type="xs:integer"/>
+<xs:attribute name="name" type="xs:string"/>
+<xs:attribute name="lang" type="xs:string"/>
+<xs:attribute name="owner" type="xs:string"/>
+<xs:attribute name="owner_id" type="xs:integer"/>
+<xs:attribute name="author" type="xs:string"/>
+<xs:attribute name="version" type="xs:float"/>
+<xs:attribute name="probability" type="xs:integer"/>
+<xs:attribute name="site" type="xs:integer" default="0"/>
+<xs:attribute name="weight" type="xs:integer" default="0"/>
+<xs:attribute name="u" type="xs:integer"/>
+<xs:attribute name="v" type="xs:integer"/>
+<xs:attribute name="w" type="xs:integer"/>
+<xs:attribute name="x" type="xs:integer"/>
+<xs:attribute name="y" type="xs:integer"/>
+<xs:attribute name="z" type="xs:integer"/>
+<xs:attribute name="t" type="xs:integer"/>
+
+
+<xs:attributeGroup name="id_date_author">
+      <xs:attribute ref="id"/>
+      <xs:attribute ref="date"/>
+      <xs:attribute ref="author"/>
+</xs:attributeGroup>
+
+<xs:element name="g_ref">
+    <xs:complexType>
+        <xs:simpleContent>
+            <xs:extension base="xs:string">
+              <xs:attributeGroup ref="id_date_author"/>
+              <xs:attribute ref="lang" use="required"/>
+            </xs:extension>
+        </xs:simpleContent>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="quote" substitutionGroup="g_ref"/>
+
+<xs:element name="dimension">
+    <xs:complexType>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="optional"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="arrow">
+    <xs:complexType>
+        <xs:attribute ref="site" use="required"/>
+        <xs:attribute ref="weight" use="required"/>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="required"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="condition">
+    <xs:complexType>
+        <xs:attribute ref="site" use="required"/>
+        <xs:attribute ref="weight" use="required"/>
+        <xs:attribute ref="node_id" use="required"/>
+        <xs:attribute ref="parent" use="required"/>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="required"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="condition_anonym">
+    <xs:complexType>
+        <xs:sequence minOccurs="0" maxOccurs="unbounded">
+            <xs:element ref="condition_anonym"/>
+        </xs:sequence>
+        <xs:sequence minOccurs="0" maxOccurs="unbounded">
+            <xs:element ref="arrow"/>
+        </xs:sequence>
+        <xs:attribute ref="site" use="required"/>
+        <xs:attribute ref="weight" use="required"/>
+        <xs:attribute ref="u" use="optional"/>
+        <xs:attribute ref="v" use="optional"/>
+        <xs:attribute ref="w" use="optional"/>
+        <xs:attribute ref="x" use="required"/>
+        <xs:attribute ref="y" use="optional"/>
+        <xs:attribute ref="z" use="optional"/>
+        <xs:attribute ref="t" use="optional"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="state">
+    <xs:complexType>
+    <xs:sequence minOccurs="1" maxOccurs="unbounded">
+        <xs:element ref="arrow"/>
+    </xs:sequence>
+    <xs:attributeGroup ref="id_date_author"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="object" substitutionGroup="state"/>
+
+<xs:element name="transition">
+    <xs:complexType>
+        <xs:sequence minOccurs="1" maxOccurs="unbounded">
+            <xs:element minOccurs="0" ref="quote"/>
+            <xs:element ref="arrow"/>
+        </xs:sequence>
+        <xs:attributeGroup ref="id_date_author"/>
+        <xs:attribute ref="parent" use="required"/>
+        <xs:attribute ref="probability" use="required"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="transition_anonym">
+    <xs:complexType>
+        <xs:attributeGroup ref="id_date_author"/>
+        <xs:attribute ref="probability" use="required"/>
+    </xs:complexType>
+</xs:element>
+
+<xs:element name="gem-graph-model">
+<xs:complexType>
+<xs:sequence minOccurs="1" maxOccurs="1">
+    <xs:element name="identity">
+        <xs:complexType>
+          <xs:sequence minOccurs="1" maxOccurs="1">
+              <xs:element name="name" type="xs:string"/>
+              <xs:element name="owner" type="xs:string"/>
+              <xs:element name="owner_id" type="xs:integer"/>
+              <xs:element name="date" type="xs:integer"/>
+              <xs:element name="version" type="xs:float"/>
+              <xs:element ref="g_ref" minOccurs="1" maxOccurs="1"/>
+          </xs:sequence>
+        </xs:complexType>
+    </xs:element>
+
+    <xs:element name="parameters">
+        <xs:complexType>
+        <xs:sequence minOccurs="1" maxOccurs="1">
+
+            <xs:element name="simulation">
+                <xs:complexType>
+                <xs:sequence minOccurs="1" maxOccurs="1">
+                    <xs:element name="max_thread" type="xs:integer"/>
+                    <xs:element name="max_cycles" type="xs:integer"/>
+                </xs:sequence>
+                </xs:complexType>
+            </xs:element>
+
+            <xs:element name="space-param">
+                <xs:complexType>
+                <xs:sequence minOccurs="1" maxOccurs="1">
+                    <xs:element ref="dimension"/>
+                    <xs:element name="site_multiplicity" type="xs:integer"/>
+              </xs:sequence>
+              </xs:complexType>
+          </xs:element>
+
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="objects">
+          <xs:complexType>
+          <xs:sequence minOccurs="1" maxOccurs="unbounded">
+              <xs:element ref="object"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="savedstates">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="state"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="conditionslist">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element minOccurs="0" ref="quote"/>
+              <xs:element ref="condition"/>
+          </xs:sequence>
+          <xs:attributeGroup ref="id_date_author"/>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="transitionslist">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="transition"/>
+          </xs:sequence>
+          </xs:complexType>
+      </xs:element>
+
+      <xs:element name="conditionstree">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="condition_anonym"/>
+          </xs:sequence>
+          <xs:sequence minOccurs="0" maxOccurs="1">
+              <xs:element ref="transition_anonym"/>
+          </xs:sequence>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="arrow"/>
+          </xs:sequence>
+          </xs:complexType>
+      </xs:element>
+
+</xs:sequence>
+<xs:attribute ref="version" use="required"/>
+</xs:complexType>
+</xs:element>
+</xs:schema>
+

description_modes.txt

@@ -0,0 +1,32 @@
+Home:
+    - Pas de sidebar (inutile)
+    - Récemment ouverts
+        - Permettre d'ouvrir directement sans validation (par un "ne pas redemander")
+    - Logo en grand au centre
+
+Edit:
+    - Sidebar présente
+        - Bibliothèques (par stack)
+            - objets
+            - conditions/transitions (liées)
+            - états sauvegardés
+    - Zone principale
+        - vue état globale 3D (en haut ou en bas) avec zoom sur localité
+        - vue édition (avec split) -> vue 3D aussi ? vue schématique ? 
+            - conditions/transitions
+            - objets
+            - états
+
+Run:
+    - Sidebar
+        - Contrôles
+            - Vitesse
+            - Pas à pas
+            - Avance/Recul/Run/Pause (avec vue buffer)
+    - Bibliothèques (par stack)
+            - objets
+            - conditions/transitions (liées)
+            - états sauvegardés
+    - Zone principale
+        - Vue globale 3D (en haut ou bas)
+        - Mesures (stats par exemple)

draft getters-setters & co (résumé)

@@ -0,0 +1,143 @@
+static GLuint *buffer_lines_origin = NULL;
+---
+long get_buffer_lines_size() {return buffer_lines_size / 2;}
+void inc_buffer_lines_size(long inc) {buffer_lines_size += inc * 2;}
+void dec_buffer_lines_size(long dec) {buffer_lines_size -= dec * 2;}
+
+void xxx_draw_line (GLuint *lines_origin, int a, int b, long lines_index)
+{
+    //  https://docs.gtk.org/glib/func.realloc.html
+    printf("xxx_draw_line %ld\n", lines_index);
+    buffer_lines_origin = g_realloc(lines_origin, sizeof(GLuint) * 2);
+    *(lines_origin + lines_index + 0) = a; // lines_index ++;
+    *(lines_origin + lines_index + 1) = b; // lines_index ++;
+}
+
+/* (gdb) help
+List of classes of commands:
+
+aliases -- User-defined aliases of other commands.
+breakpoints -- Making program stop at certain points.
+data -- Examining data.
+files -- Specifying and examining files.
+internals -- Maintenance commands.
+obscure -- Obscure features.
+running -- Running the program.
+stack -- Examining the stack.
+status -- Status inquiries.
+support -- Support facilities.
+text-user-interface -- TUI is the GDB text based interface.
+tracepoints -- Tracing of program execution without stopping the program.
+user-defined -- User-defined commands.
+*/
+
+
+
+
+
+
+
+
+
+
+
+-------------------------------------------------------------------------------------------
+GLuint arrows[] = {
+     1,    0,  0, 0, 0,
+     /* 1,    1,  1, 0, 0, */
+     /* 1,    2,  2, 1, 1, */
+     /* 1,    3,  2, 2, 1, */
+     /* 1,    4,  3, 0, 1, */
+     /* 1,    5,  3, 0, 2, */
+     /* 1,    1,  3, 0, 2, */
+     /* 1,    0,  2, 0, 2, */
+     /* 1,    5,  2, 1, 1, */
+// load, site, x, y, z
+};
+
+static void get_model_data_and_user_preferences(){
+
+
+    model_space_size_x = 1;    //   0 < model_space_size_x
+    model_space_size_y = 1;    //   0 < model_space_size_y
+    model_space_size_z = 1;    //   0 < model_space_size_z
+
+    // XXX ONLY space drawed, no arrows yet
+
+    model_arrows_nb = sizeof(arrows); //  assert : l'emplacement des flèches est contraint
+                         //  par model_space_size_x, y, z et le nombre de sites
+
+    central_stars_nb = 0;  //  à calculer   TODO
+    // !  WARNING  !  Pour l'instant égal au nombre de flèches ! (central stars réécrites)
+    central_stars_nb = model_arrows_nb;
+
+//    pref_mark_unit_space = 0;       // 0 = no marks, 1 = 1st, 2 = last, 3 = both
+//    pref_style_lines_planes = 0;    // 0 = arrows as lines, 1 = as planes, 2 = mix
+//    pref_style_mix_colors = 0;      // TODO
+    pref_show_grid = 0;             //  0,   1,   2, 3, 5,   6, 10, 15,   30,   etc
+                                    // xyz,  0,   x, y, z,  xy, xz, yz,  xyz
+    pref_test_diagonal = 1;
+}
+-------------------------------------------------------------------------------------------
+
+
+
+
+in buffers.c  (line 283)
+
+static void draw_line (GLuint *lines_origin, int a, int b)
+{
+    xxx_draw_line (lines_origin, a, b, lines_index);
+    lines_index += 2;
+  //  *(lines_origin + lines_index) = a; lines_index ++;
+  //  *(lines_origin + lines_index) = b; lines_index ++;
+}
+
+---------------------------------------------------------------------------
+
+
+
+[ n]  load  site  x    y    z   ----    < arrows array >    ------------------------------------------------------------
+[ 0] =  1,   0,   0,   0,   0        
+[ 1] =  0,   0,   0,  217808480,  32708        
+[ 2] = 217809344,  32708,  217807968,  32708,  217810080        
+[ 3] = 32708,  -69297984,  32707,  229965808,  32708        
+[ 4] = 229944176,  32708,  217808608,  32708,  229970384        
+[ 5] = 32708,  217808576,  32708,  217809024,  32708        
+[ 6] = 217808992,  32708,  -69297888,  32707,  229954976        
+[ 7] = 32708,  217808512,  32708,  229949456,  32708        
+[ 8] = 229942736,  32708,   0,   0,   0        
+[ 9] =  0,   0,   0,  226977440,  32708        
+[10] = 217810048,  32708,  217808352,  32708,  217808704        
+[11] = 32708,  -69297600,  32707,  217808448,  32708        
+[12] = 217807808,  32708,  217808896,  32708,  217809312        
+[13] = 32708,  217807872,  32708,  225561296,  32708        
+[14] = 217814880,  32708,  217814944,  32708,  217807776        
+[15] = 32708,  229974752,  32708,  217811040,  32708        
+[16] = 229947200,  32708,   0,   0,  33506144        
+[17] =  0,   0,   0,   0,   0        
+[18] = 33204048,   0,   0,   0,  33587952        
+[19] =  0,  30217696,   0,  30245088,   0        
+
+[ n]  load  site  x    y    z   ----    < arrows array >    ------------------------------------------------------------
+[ 0] =  1,   0,   0,   0,   0        
+[ 1] =  0,   0,   0,  2105314912,  32683        
+[ 2] = 2105315776,  32683,  2105314400,  32683,  2105316512        
+[ 3] = 32683,  2019551424,  32683,  2117545968,  32683        
+[ 4] = 2117524336,  32683,  2105315040,  32683,  2117550544        
+[ 5] = 32683,  2105315008,  32683,  2105315456,  32683        
+[ 6] = 2105315424,  32683,  2019551520,  32683,  2117535136        
+[ 7] = 32683,  2105314944,  32683,  2117529616,  32683        
+[ 8] = 2117522896,  32683,   0,   0,   0        
+[ 9] =  0,   0,   0,  2114557600,  32683        
+[10] = 2105316480,  32683,  2105314784,  32683,  2105315136        
+[11] = 32683,  2019551808,  32683,  2105314880,  32683        
+[12] = 2105314240,  32683,  2105315328,  32683,  2105315744        
+[13] = 32683,  2105314304,  32683,  2113141456,  32683        
+[14] = 2105321312,  32683,  2105321376,  32683,  2105314208        
+[15] = 32683,  2117554912,  32683,  2105317472,  32683        
+[16] = 2117527360,  32683,   0,   0,  16032608        
+[17] =  0,   0,   0,   0,   0        
+[18] = 15766240,   0,   0,   0,  15950576        
+[19] =  0,  12654048,   0,  12681440,   0        
+

gdb.txt

@@ -0,0 +1,77 @@
+The program is not being run.
+Temporary breakpoint 1 at 0x404740: file src/main.c, line 42.
+Starting program: /home/jean/Gem-Graph/gem-graph-client/bin/gem-graph-client 
+[Thread debugging using libthread_db enabled]
+Using host libthread_db library "/gnu/store/gsjczqir1wbz8p770zndrpw4rnppmxi3-glibc-2.35/lib/libthread_db.so.1".
+
+Temporary breakpoint 1, main (argc=1, argv=0x7fffffffce58) at src/main.c:42
+42	    app = gem_graph_client_application_new("org.alec.gemgraph",
+Continuing.
+[New Thread 0x7fffef5ff640 (LWP 21368)]
+[New Thread 0x7fffee2f5640 (LWP 21369)]
+[New Thread 0x7fffecfeb640 (LWP 21370)]
+[Thread 0x7fffecfeb640 (LWP 21370) exited]
+[New Thread 0x7fffecfeb640 (LWP 21371)]
+[New Thread 0x7fffe49b5640 (LWP 21372)]
+[New Thread 0x7fffe41b4640 (LWP 21373)]
+[New Thread 0x7fffe2eaa640 (LWP 21374)]
+[New Thread 0x7fffe1ba0640 (LWP 21375)]
+[New Thread 0x7fffe0896640 (LWP 21376)]
+[New Thread 0x7fffdf58c640 (LWP 21377)]
+[New Thread 0x7fffde282640 (LWP 21378)]
+[New Thread 0x7fffdcf78640 (LWP 21379)]
+[New Thread 0x7fffdbc6e640 (LWP 21380)]
+[Thread 0x7fffe49b5640 (LWP 21372) exited]
+[Thread 0x7fffde282640 (LWP 21378) exited]
+[Thread 0x7fffdf58c640 (LWP 21377) exited]
+[Thread 0x7fffe0896640 (LWP 21376) exited]
+[Thread 0x7fffe1ba0640 (LWP 21375) exited]
+[Thread 0x7fffe41b4640 (LWP 21373) exited]
+[Thread 0x7fffdbc6e640 (LWP 21380) exited]
+[Thread 0x7fffdcf78640 (LWP 21379) exited]
+[Thread 0x7fffe2eaa640 (LWP 21374) exited]
+[Thread 0x7fffecfeb640 (LWP 21371) exited]
+[New Thread 0x7fffecfeb640 (LWP 21381)]
+[New Thread 0x7fffdbc6e640 (LWP 21382)]
+[New Thread 0x7fffdcf78640 (LWP 21383)]
+[New Thread 0x7fffde282640 (LWP 21384)]
+[New Thread 0x7fffe33ff640 (LWP 21385)]
+[New Thread 0x7fffe20f5640 (LWP 21386)]
+[New Thread 0x7fffe0deb640 (LWP 21387)]
+[New Thread 0x7fffe05ea640 (LWP 21388)]
+[New Thread 0x7fffdda81640 (LWP 21389)]
+[New Thread 0x7fffdb46d640 (LWP 21390)]
+[New Thread 0x7fffd965a640 (LWP 21391)]
+[New Thread 0x7fffd8350640 (LWP 21392)]
+[New Thread 0x7fffd7046640 (LWP 21393)]
+[New Thread 0x7fffd5d3c640 (LWP 21394)]
+[New Thread 0x7fffd4a32640 (LWP 21395)]
+[New Thread 0x7fffd3728640 (LWP 21396)]
+[New Thread 0x7fffd241e640 (LWP 21397)]
+[New Thread 0x7fffd1c1d640 (LWP 21398)]
+[Thread 0x7fffd241e640 (LWP 21397) exited]
+[Thread 0x7fffd1c1d640 (LWP 21398) exited]
+[New Thread 0x7fffd1c1d640 (LWP 21399)]
+[New Thread 0x7fffd241e640 (LWP 21400)]
+[Thread 0x7fffd1c1d640 (LWP 21399) exited]
+[Thread 0x7fffd241e640 (LWP 21400) exited]
+[New Thread 0x7fffd241e640 (LWP 21401)]
+[New Thread 0x7fffd1c1d640 (LWP 21402)]
+[Thread 0x7fffd7046640 (LWP 21393) exited]
+
+Thread 1 "gem-graph-clien" received signal SIGINT, Interrupt.
+0x00007ffff5ab4d4b in __memmove_sse2_unaligned_erms () from /gnu/store/gsjczqir1wbz8p770zndrpw4rnppmxi3-glibc-2.35/lib/libc.so.6
+Breakpoint 2 at 0x4088a5: file src/graphics/graphics.c, line 697.
+Continuing.
+[Thread 0x7fffd5d3c640 (LWP 21394) exited]
+
+Thread 1 "gem-graph-clien" received signal SIGINT, Interrupt.
+0x00007ffff5b77dca in __memset_avx2_unaligned_erms () from /gnu/store/gsjczqir1wbz8p770zndrpw4rnppmxi3-glibc-2.35/lib/libc.so.6
+Breakpoint 3 at 0x408320: file src/graphics/graphics.c, line 873.
+Continuing.
+
+Thread 1 "gem-graph-clien" received signal SIGINT, Interrupt.
+0x00007ffff5ab4e3e in __memmove_sse2_unaligned_erms () from /gnu/store/gsjczqir1wbz8p770zndrpw4rnppmxi3-glibc-2.35/lib/libc.so.6
+Quit
+
+quit

include/base.h

@@ -0,0 +1,108 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: Base header
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <glib-2.0/glib.h>
+#define G_APPLICATION_DEFAULT_FLAGS 0
+
+// Graphical axis
+enum
+{
+    X_AXIS,
+    Y_AXIS,
+    Z_AXIS,
+
+    N_AXIS
+};
+
+// Gem-graph modes
+enum
+{
+    HOME_MODE,
+    RUN_MODE,
+    EDIT_MODE,
+    PRESENTATION_MODE,
+
+    N_MODE
+};
+
+/*
+ * Read a file from filename into a provided buffer
+ *
+ * @param   filename, file name
+ *          contents, target ptr
+ *
+ * @return  void
+ */
+static inline char *read_file(char *filename)
+{
+    int fd;
+    int filesize;
+    char *contents;
+
+    fd = open(filename, O_RDONLY);
+    if(fd < 0) {
+        printf("Couldn't read file: %s\n",filename);
+        return NULL;
+    }
+
+    filesize = lseek(fd, 0, SEEK_END) + 1 ;
+    contents = g_malloc(filesize * sizeof(char));
+    assert (contents);
+
+    lseek(fd, 0, SEEK_SET);
+    read(fd,contents,filesize);
+
+    contents[filesize-1] = '\0';
+
+    close(fd);
+
+    return contents;
+}
+
+/* I'm standing on Earth (any planet or star or spinning spheroid, in fact)
+ * and looking towards its North pole
+ *
+ *  X - X   =   EAST   - WEST    =   rouge - cyan
+ *  Y - Y   =   ZENITH - NADIR   =   vert  - magenta
+ *  Z - Z   =   NORTH  - SOUTH   =   bleu  - jaune
+ */
+
+#define EAST   0 // + x  rouge
+#define WEST   1 // - x  cyan
+#define ZENITH 2 // + y  vert
+#define NADIR  3 // - y  magenta
+#define SOUTH  4 // + z  bleu
+#define NORTH  5 // - z  jaune

include/graphics.h

@@ -0,0 +1,386 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include "base.h"
+#include <unistd.h>
+#include <stdbool.h>
+#include <epoxy/gl.h>
+#include <GL/glu.h>
+#include <GL/glext.h>
+
+#define VERTEX_SHADER_FILE "src/graphics/shaders/shader.vert"
+#define FRAG_SHADER_FILE "src/graphics/shaders/shader.frag"
+#define GL_TARGET_MAJOR_VERSION 0
+#define GL_TARGET_MINOR_VERSION 4
+
+/*
+ * Structure describing a gl_area and its parameters, used to create a table
+ * of Gem-graph client current gl_areas
+ */
+struct graphic_stack_t {
+
+    int id;
+    int mode;
+
+    float rotation_angles[N_AXIS]; // Rotation angles on each axis
+
+    GLuint vao;             //  init_buffers
+    GLuint position_buffer; //  shutdown, draw
+    GLuint color_buffer;    //  shutdown, draw
+    GLuint program;         //  shutdown, init_shaders, draw
+    GLuint m;               //  init_shaders, draw
+    GLuint v;               //  init_shaders, draw
+    GLuint p;               //  init_shaders, draw
+
+    struct arrow_t *arrows_ptr;
+    long arrows_nb;
+
+    GLfloat *buffer_vertex_origin;
+    GLfloat *buffer_colors_origin;
+    GLuint *buffer_lines_origin;
+    GLuint *buffer_plans_origin;
+
+    long buffer_vertex_size;
+    long buffer_colors_size;
+    long buffer_lines_size;
+    long buffer_plans_size;
+
+    long buffer_vertex_0_arrow;
+    long buffer_colors_0_arrow;
+    long buffer_lines_0_arrow;
+    long buffer_plans_0_arrow;
+};
+
+/*
+ * Dynamic array of ptrs to dynamically allocated gl_area_entry
+ */
+extern struct graphic_stack_t *graphic_stack;
+
+/*
+ * Initializes a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if initialized
+ */
+int graphics_init(void *error_buffer);
+
+/*
+ * Draws the current buffer to a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  void
+ */
+void graphics_draw(const int stack_id);
+
+/*
+ * Shutdowns a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if success
+ */
+bool graphics_shutdown(const int stack_id, void *error_buffer);
+
+/*
+ * Initializes the shaders of a gl_area and link them to a program
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if initialized
+ */
+bool graphics_init_shaders(const int stack_id);
+
+/* Initializes the buffer of a gl_area
+ * Calls according to the user preferences
+ * @param   gl_area, ptr to the gl_area widget
+ * @return  void
+ */
+void graphics_init_buffers(const int stack_id);
+
+/*
+ * Draws a vertex (x, y, z)
+ * if (console) prints (x, y, z) values to console
+ *
+ * @param   GLfloat x, GLfloat y, GLfloat z
+ *
+ * @return  void
+ */
+void graphics_draw_vertex (const int stack_id,
+                           GLfloat x,
+                           GLfloat y,
+                           GLfloat z);
+
+/*
+ * Draws the color (r, g, b) associated to a vertex
+ * if (console) prints (r, g, b) values to console
+ *
+ * @param   GLfloat r, GLfloat g, GLfloat b
+ *
+ * @return  void
+ */
+void graphics_draw_color (const int stack_id, GLfloat r, GLfloat g, GLfloat b);
+
+/*
+ *  Writes values to describe a line from a to b into the line buffer
+ *
+ *  @param coords GLuint (a,b)
+ *
+ *  @return void
+ */
+void graphics_draw_line (const int stack_id, GLuint a, GLuint b);
+
+/*
+ *  Writes values to describe an (a,b,c) plan (triangle) into the plan buffer
+ *
+ *  @param coords GLuint (a,b,c)
+ *
+ *  @return void
+ */
+void graphics_draw_plan (const int stack_id, GLuint a, GLuint b, GLuint c);
+
+/*
+ * Initializes an identity matrix
+ *
+ * @param   res, target ptr
+ *
+ * @return  void
+ */
+static inline void compute_i(float *res)
+{
+    /* initialize to the identity matrix */
+    res[0] = 1.f; res[4] = 0.f; res[8] = 0.f; res[12] = 0.f;
+    res[1] = 0.f; res[5] = 1.f; res[9] = 0.f; res[13] = 0.f;
+    res[2] = 0.f; res[6] = 0.f; res[10] = 1.f; res[14] = 0.f;
+    res[3] = 0.f; res[7] = 0.f; res[11] = 0.f; res[15] = 1.f;
+}
+
+/*
+ * Computes the projection matrix
+ *
+ * @param   res, target ptr
+ *          phi, XXX
+ *          theta, XXX
+ *          psi, XXX
+ *
+ * @return  void
+ */
+static inline void compute_mvp(float *res, float phi, float theta, float psi)
+{
+    float x = phi *(G_PI / 180.f);
+    float y = theta *(G_PI / 180.f);
+    float z = psi *(G_PI / 180.f);
+    float c1 = cosf(x), s1 = sinf(x);
+    float c2 = cosf(y), s2 = sinf(y);
+    float c3 = cosf(z), s3 = sinf(z);
+    float c3c2 = c3 * c2;
+    float s3c1 = s3 * c1;
+    float c3s2s1 = c3 * s2 * s1;
+    float s3s1 = s3 * s1;
+    float c3s2c1 = c3 * s2 * c1;
+    float s3c2 = s3 * c2;
+    float c3c1 = c3 * c1;
+    float s3s2s1 = s3 * s2 * s1;
+    float c3s1 = c3 * s1;
+    float s3s2c1 = s3 * s2 * c1;
+    float c2s1 = c2 * s1;
+    float c2c1 = c2 * c1;
+
+    compute_i(res);
+
+    /* apply all three rotations using the three matrices:
+     *
+     * ⎡  c3 s3  0 ⎤ ⎡ c2  0 -s2 ⎤ ⎡ 1   0  0 ⎤
+     * ⎢ -s3 c3  0 ⎥ ⎢  0  1   0 ⎥ ⎢ 0  c1 s1 ⎥
+     * ⎣  0   0  1 ⎦ ⎣ s2  0  c2 ⎦ ⎣ 0 -s1 c1 ⎦
+     */
+    res[0] = c3c2;  res[4] = s3c1 + c3s2s1; res[8] = s3s1 - c3s2c1; res[12] = 0.f;
+    res[1] = -s3c2; res[5] = c3c1 - s3s2s1; res[9] = c3s1 + s3s2c1; res[13] = 0.f;
+    res[2] = s2;    res[6] = -c2s1;         res[10] = c2c1;         res[14] = 0.f;
+    res[3] = 0.f;   res[7] = 0.f;           res[11] = 0.f;          res[15] = 1.f;
+}
+
+/*
+ * Created and compile a shader
+ *
+ * @param   type, shader type
+ *          src, source code of shader
+ *
+ * @return  shader id
+ */
+static inline GLuint create_shader(const int stack_id, int type, const char *src)
+{
+    GLuint shader;
+    int status;
+
+    shader = glCreateShader(type);
+    glShaderSource(shader, 1, &src, NULL);
+    glCompileShader(shader);
+
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+    if(status == GL_FALSE) {
+        int log_len;
+        char *buffer;
+
+        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
+
+        buffer = g_malloc(log_len + 1);
+        assert (buffer);
+        glGetShaderInfoLog(shader, log_len, NULL, buffer);
+
+        g_warning("Compile failure in %s shader:\n%s",
+                             type == GL_VERTEX_SHADER ? "vertex" : "fragment",
+                             buffer);
+
+        g_free(buffer);
+
+        glDeleteShader(shader);
+
+        return 0;
+     }
+
+    return shader;
+}
+
+static inline void print_stack(int stack_id)
+{
+    static int n = 0;
+
+    printf("\n[n=%d]***************", n);
+
+    printf("id = %d\tmode = %d\n",
+           graphic_stack[stack_id].id,
+           graphic_stack[stack_id].mode);
+
+    printf("rotation_angles = ");
+    for (int i = 0; i < N_AXIS; i++) {
+        printf("%f\t", graphic_stack[stack_id].rotation_angles[i]); // Rotation angles on each axis
+    }
+    printf("\n");
+
+    printf("vao = %d\n", graphic_stack[stack_id].vao);
+    printf("position_buffer = %d\n", graphic_stack[stack_id].position_buffer);
+    printf("color_buffer = %d\n", graphic_stack[stack_id].color_buffer);
+    printf("program = %d\n", graphic_stack[stack_id].program);
+    printf("m = %d\n", graphic_stack[stack_id].m);
+    printf("v = %d\n", graphic_stack[stack_id].v);
+    printf("p = %d\n", graphic_stack[stack_id].p);
+
+    printf("arrows_ptr = %p\n", graphic_stack[stack_id].arrows_ptr);
+    printf("arrows_nb = %ld\n", graphic_stack[stack_id].arrows_nb);
+
+    printf("buffer_vertex_origin = %p\n", graphic_stack[stack_id].buffer_vertex_origin);
+    printf("buffer_colors_origin = %p\n", graphic_stack[stack_id].buffer_colors_origin);
+    printf("buffer_lines_origin = %p\n", graphic_stack[stack_id].buffer_lines_origin);
+    printf("buffer_plans_origin = %p\n", graphic_stack[stack_id].buffer_plans_origin);
+
+    printf("buffer_vertex_size = %ld\n", graphic_stack[stack_id].buffer_vertex_size);
+    printf("buffer_colors_size = %ld\n", graphic_stack[stack_id].buffer_colors_size);
+    printf("buffer_lines_size = %ld\n", graphic_stack[stack_id].buffer_lines_size);
+    printf("buffer_plans_size = %ld\n", graphic_stack[stack_id].buffer_plans_size);
+
+    printf("buffer_vertex_0_arrow = %p\n", graphic_stack[stack_id].buffer_vertex_0_arrow);
+    printf("buffer_colors_0_arrow = %p\n", graphic_stack[stack_id].buffer_colors_0_arrow);
+    printf("buffer_lines_0_arrow = %p\n", graphic_stack[stack_id].buffer_lines_0_arrow);
+    printf("buffer_plans_0_arrow = %p\n", graphic_stack[stack_id].buffer_plans_0_arrow);
+
+    printf("********************\n");
+    n++;
+}
+
+/*** TEST ***/
+
+void main_test_graphics (const int stack_id);
+
+/*
+ * Structure describing an arrow
+ */
+struct arrow_t {
+    GLuint load;
+    GLuint site;
+    GLuint x;
+    GLuint y;
+    GLuint z;
+};
+
+int draw_one_arrow_vertex (const int stack_id,
+                           int space_X,
+                           int space_Y,
+                           int space_Z,
+                           int weight,
+                           int site,
+                           int x,
+                           int y,
+                           int z);
+
+int draw_one_arrow_line(const int stack_id,
+                        int offset_vertex);
+
+/*
+ *  Writes grid ridges to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z), step_x, step_y, step_z
+ *
+ *  @return void
+ */
+int draw_space_ridges_vertex (const int stack_id,
+                              long offset_vertex,
+                              long x,
+                              long y,
+                              long z);
+
+int draw_space_ridges_lines (const int stack_id);
+
+/*
+ *  Writes grid lines on space faces
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+long draw_grids_on_space_faces_vertex (const int stack_id,
+                                       long x,
+                                       long y,
+                                       long z);
+
+long draw_grids_on_space_faces_lines (const int stack_id,
+                                      long offset_vertex,
+                                      long x,
+                                      long y,
+                                      long z);
+
+int set_arrow (int stack_id,
+               int arrows_nb,
+               int space_X,
+               int space_Y,
+               int space_Z,
+               int requested_weight,
+               int site,
+               int arrow_x,
+               int arrow_y,
+               int arrow_z);
+

include/parsing.h

@@ -0,0 +1,25 @@
+#include <stdbool.h>
+#include <libxml/parser.h>
+// #define LIBXML_TEST_VERSION 
+// xmlCheckVersion(20912)
+
+bool model_init(char *docname);
+bool model_shutdown(char *docname);
+char model_get_dim(xmlChar *reste);
+char model_get_dim_X(xmlChar *path);
+char model_get_dim_Y(xmlChar *path);
+char model_get_dim_Z(xmlChar *path);
+char model_get_dim_value(xmlChar *path, xmlChar *axis);
+char model_get_cond (xmlChar *path, xmlChar *node_id);
+char model_get_trans (xmlChar *path, xmlChar *node_id);
+char model_get_cond_tree (xmlChar *path);
+char model_get_multiplicity (xmlChar *path);
+char model_get_objects_list(xmlChar *path);
+char model_get_states_list(xmlChar *path);
+long model_get_state_arrows_count(xmlChar *path, long n);
+int model_get_state(xmlChar *path, xmlChar *state_id);
+char model_get_conditions_list(xmlChar *path);
+char model_get_transitions_list(xmlChar *path);
+
+
+

include/ui.h

@@ -0,0 +1,232 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: User interface header
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <unistd.h>
+#include <gtk-4.0/gtk/gtk.h>
+
+#include "../include/base.h"
+
+G_BEGIN_DECLS
+
+#define GEM_GRAPH_CLIENT_TYPE_WINDOW (gem_graph_client_window_get_type())
+
+G_DECLARE_FINAL_TYPE (GemGraphClientWindow,
+                      gem_graph_client_window,
+                      GEM_GRAPH_CLIENT,
+                      WINDOW,
+                      GtkApplicationWindow)
+
+G_END_DECLS
+
+G_BEGIN_DECLS
+
+#define GEM_GRAPH_CLIENT_TYPE_APPLICATION (gem_graph_client_application_get_type())
+
+G_DECLARE_FINAL_TYPE (GemGraphClientApplication,
+                      gem_graph_client_application,
+                      GEM_GRAPH_CLIENT,
+                      APPLICATION,
+                      GtkApplication)
+
+GemGraphClientApplication *gem_graph_client_application_new(const char *application_id,
+                                                             GApplicationFlags flags);
+
+G_END_DECLS
+
+
+void ui_enable_action(const char *name);
+
+void ui_disable_action(const char *name);
+
+//
+// Actions
+//
+void on_about_action(GSimpleAction *action,
+                     GVariant *parameter,
+                     gpointer user_data);
+
+void on_quit_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_preferences_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_togglesidebar_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_editmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_runmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_presentmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_openfile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_closefile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_savefile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+void on_toast_close_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+
+static const GActionEntry app_actions[] = {
+    { "quit", on_quit_action, NULL, NULL, NULL },
+    { "about", on_about_action, NULL, NULL, NULL },
+    { "preferences", on_preferences_action, NULL, NULL, NULL },
+    { "togglesidebar", on_togglesidebar_action, NULL, NULL, NULL },
+    { "editmode", on_editmode_action, NULL, NULL, NULL },
+    { "runmode", on_runmode_action, NULL, NULL, NULL },
+    { "presentmode", on_presentmode_action, NULL, NULL, NULL },
+    { "openfile", on_openfile_action, NULL, NULL, NULL },
+    { "closefile", on_closefile_action, NULL, NULL, NULL },
+    { "savefile", on_savefile_action, NULL, NULL, NULL },
+    { "toastclose", on_toast_close_action, NULL, NULL, NULL },
+};
+
+//
+// Actions responses
+//
+void on_openfile_response(GtkNativeDialog *native,
+                          int response,
+                          GemGraphClientWindow *self);
+
+void on_openfile_response_complete(GObject *source_object,
+                                   GAsyncResult *result,
+                                   GemGraphClientWindow *self);
+
+//
+// General events
+//
+void on_axis_value_change(GtkAdjustment *adjustment, gpointer data);
+
+gboolean on_glarea_render(GtkGLArea * area, GdkGLContext * context);
+
+void on_glarea_realize(GtkWidget *widget);
+
+void on_glarea_unrealize(GtkWidget *widget);
+
+void on_close_window(GtkWidget *widget);
+
+/* -------------------------------------------------------------------------- */
+
+//
+// Window primitives
+//
+
+void ui_set_stack(int mode);
+
+void ui_send_internal_notification(const char *message);
+void ui_close_internal_notification(void);
+void ui_toggle_sidebar();
+
+//
+// Graphical stuff
+//
+
+/*
+ *  Creates GLArea and indexes it
+ *
+ *  @params target_mode, meaning which ui_stack we're on
+ *          target_widget, meaning the box that will host the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_setup_glarea(int target_mode, GtkWidget *target_widget);
+
+
+/*
+ *  Look for stack entry and returns stack_id
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns stack_id
+ */
+long ui_get_graphic_stack(void *container_widget);
+
+/*
+ *  Look for stack entry and initializes OpenGL for it
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_init_graphic_stack(void *container_widget, GError *error_buffer);
+
+/*
+ *  Look for stack entry and shutdowns OpenGL for it
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_shutdown_graphic_stack(void *container_widget, GError *error_buffer);
+
+
+void ui_clean_stack_index(void);
+
+/*
+ *  Look for stack entry and triggers OpenGL for drawing
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_render_stack(GtkWidget *container_widget);
+
+/*
+ *  Look for every stack entry and shutdowns OpenGL for it
+ *
+ *  @params void
+ *
+ *  @returns bool, true if success
+ */
+void ui_shutdown_all_graphic_stacks(void);
+
+/*
+ *  Look for stack entry and triggers OpenGL for drawing
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_update_axis_stack(GtkWidget *container_widget, int axis, int value);
+

manifest.scm

@@ -0,0 +1,29 @@
+;;
+;; Dépendances sous GNU Guix
+;;
+
+
+(specifications->manifest
+  (list
+      "bash"
+      "coreutils"
+      "gcc-toolchain"
+      "pkg-config"
+      "valgrind"
+      "findutils"
+      "gdb"
+      "make"
+      "gtk"
+      "libxml2"
+      "glu"
+      "glew"
+      "glfw"
+      "libepoxy"
+      "pango@1.90.0"
+      "xorgproto"
+      "glib"
+      "mesa-headers"
+      "mesa"
+      "libadwaita"
+   )
+)

src/graphics/arrows.c

@@ -0,0 +1,285 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *  Copyright (C) 2023 Arien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/graphics.h"
+
+/* I'm standing on Earth (any planet or star or spinning spheroid, in fact)
+ * and looking towards its North pole
+ *
+ *  X - X   =   EAST   - WEST    =   rouge - cyan
+ *  Y - Y   =   ZENITH - NADIR   =   vert  - magenta
+ *  Z - Z   =   NORTH  - SOUTH   =   bleu  - jaune
+ */
+
+int draw_one_arrow_vertex (const int stack_id,
+                           int space_X_int,
+                           int space_Y_int,
+                           int space_Z_int,
+                           int weight,
+                           int site,
+                           int arrow_x,
+                           int arrow_y,
+                           int arrow_z)
+{
+    float max = fmax(space_X_int, space_Y_int);
+          max = fmax(max, space_Z_int);
+
+    float i = arrow_x, j = arrow_y, k = arrow_z;
+
+    float vx = (2 * i / space_X_int - 1) * space_X_int / max + (1 / max),
+          vy = (2 * j / space_Y_int - 1) * space_Y_int / max + (1 / max),
+          vz = (2 * k / space_Z_int - 1) * space_Z_int / max + (1 / max);
+
+    graphics_draw_vertex(stack_id, vx, vy, vz);
+    graphics_draw_color(stack_id, 0.4f, 0.4f, 0.4f);
+
+    //    réduit légèrement les longueurs des flèches
+    //    pour qu'elles s'arrêtent avant les faces des cubes
+    GLfloat arrow_tip_padding = (1 / max) / 10;
+
+    switch(site){
+    case EAST:
+        graphics_draw_vertex (stack_id, vx - (site % 2 - 1) * (1 / max) + (site % 2 - 1) * arrow_tip_padding, vy, vz);
+        graphics_draw_color (stack_id, 1.0f, 0.0f, 0.0f);
+        break;
+    case WEST:
+        graphics_draw_vertex (stack_id, vx - (site % 2) * (1 / max) + (site % 2) * arrow_tip_padding, vy, vz);
+        graphics_draw_color (stack_id, 0.0f, 1.0f, 1.0f);
+        break;
+    case ZENITH:
+        graphics_draw_vertex (stack_id, vx, vy - (site % 2 - 1) * (1 / max) + (site % 2 - 1) * arrow_tip_padding, vz);
+        graphics_draw_color(stack_id, 0.0f, 0.6f, 0.1f);
+        break;
+    case NADIR:
+        graphics_draw_vertex (stack_id, vx, vy - (site % 2) * (1 / max) + (site % 2) * arrow_tip_padding, vz);
+        graphics_draw_color(stack_id, 0.6f, 0.1f, 0.7f);
+        break;
+    case SOUTH:
+        graphics_draw_vertex (stack_id, vx, vy, vz - (site % 2 + 1) * (1 / max) + (site % 2 + 1) * arrow_tip_padding);
+        graphics_draw_color(stack_id, 0.05f, 0.4f, 1.0f);
+        break;
+    case NORTH:
+        graphics_draw_vertex (stack_id, vx, vy, vz - (site % 2 - 2) * (1 / max) + (site % 2 - 2) * arrow_tip_padding);
+        graphics_draw_color(stack_id, 1.0f, 1.0f, 0.0f);
+        break;
+    default: break;
+    }
+
+    return 2*3;
+}
+
+
+int draw_one_arrow_line(const int stack_id, int offset_vertex)
+{
+    graphics_draw_line (stack_id, offset_vertex + 0, offset_vertex + 1);
+    return 2;
+}
+
+
+/*
+ * Depends on set_arrow()
+ * Exchanges current and required site values
+ * when the address of the arrow to be set is already occupied
+ */
+static int rewrite_arrow (const int stack_id,
+                          int address,
+                          int load,
+                          int site,
+                          int x,
+                          int y,
+                          int z)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    printf("WARNING in rewrite_arrow()  <>  address  or  address / 5  ?   (et pourquoi ?)\n");
+    stack->arrows_ptr[address].load = load;
+    return 1;
+}
+
+/*
+ * Depends on set_arrow()
+ * Creates the arrow to be set with the required load at the required address
+ */
+static inline int create_arrow (int stack_id,
+                                int arrows_nb,
+                                int space_X,
+                                int space_Y,
+                                int space_Z,
+                                int load,
+                                int site,
+                                int x,
+                                int y,
+                                int z)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    void *newptr = g_realloc(stack->arrows_ptr, (arrows_nb + 1) * sizeof(struct arrow_t));
+
+    if (newptr)
+        stack->arrows_ptr = newptr;
+    else
+        perror("In create arrow, can't allocate new arrow buffer !\n");
+
+    stack->arrows_ptr[arrows_nb].load = load;
+    stack->arrows_ptr[arrows_nb].site = site;
+    stack->arrows_ptr[arrows_nb].x = x;
+    stack->arrows_ptr[arrows_nb].y = y;
+    stack->arrows_ptr[arrows_nb].z = z;
+
+    draw_one_arrow_vertex(stack_id, space_X, space_Y, space_Z, load, site, x, y, z);
+    draw_one_arrow_line (stack_id, stack->buffer_vertex_size / 3 - 2);
+
+    arrows_nb ++;
+
+    return arrows_nb;
+}
+
+/*
+ * Depends on set_arrow()
+ * Erases the arrow at the required address
+ */
+static inline int erase_arrow (const int stack_id,
+                               int arrows_nb,
+                               int arrow_address_in_list,
+                               GLuint site,
+                               GLint x,
+                               GLint y,
+                               GLint z)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    if (arrows_nb == 0) assert (stack->buffer_lines_size ==
+                                stack->buffer_lines_0_arrow);
+    if (arrows_nb == 0) {
+        stack->buffer_lines_size =
+            stack->buffer_lines_0_arrow;
+        return 0;
+    }
+
+    assert (arrows_nb);
+    arrows_nb --;
+
+    if (arrow_address_in_list  <  arrows_nb)
+    {
+        stack->arrows_ptr[arrow_address_in_list].load  =
+                            stack->arrows_ptr[arrows_nb].load;
+        stack->arrows_ptr[arrow_address_in_list].site  =
+                            stack->arrows_ptr[arrows_nb].site;
+        stack->arrows_ptr[arrow_address_in_list].x     =
+                            stack->arrows_ptr[arrows_nb].x;
+        stack->arrows_ptr[arrow_address_in_list].y     =
+                            stack->arrows_ptr[arrows_nb].y;
+        stack->arrows_ptr[arrow_address_in_list].z     =
+                            stack->arrows_ptr[arrows_nb].z;
+    }
+
+    for (long i = 0; i < 6; i++)
+        stack->buffer_vertex_origin [stack->buffer_vertex_0_arrow + arrow_address_in_list * 6 + i]
+      = stack->buffer_vertex_origin [stack->buffer_vertex_size - 6 + i];
+
+    for (long i = 0; i < 6; i++)
+        stack->buffer_colors_origin [stack->buffer_colors_0_arrow + arrow_address_in_list * 6 + i]
+      = stack->buffer_colors_origin [stack->buffer_colors_size - 6 + i];
+
+    stack->buffer_vertex_size -= 6;   // <<<   l'inverse de ce qui est fait dans : graphics_draw_vertex()
+    stack->buffer_colors_size -= 6;   // <<<   l'inverse de ce qui est fait dans : graphics_draw_colors()
+    stack->buffer_lines_size  -= 2;   // <<<   l'inverse de ce qui est fait dans : graphics_draw_line()
+
+    void *new_arrows_vertex_ptr = g_realloc(stack->buffer_vertex_origin, stack->buffer_vertex_size * sizeof(GLfloat));
+    if (new_arrows_vertex_ptr) stack->buffer_vertex_origin = new_arrows_vertex_ptr;
+    else                       perror("In graphics.erase_arrow(), can't re_allocate for arrows vertex buffer.\n");
+
+    void *new_arrows_colors_ptr = g_realloc(stack->buffer_colors_origin, stack->buffer_colors_size * sizeof(GLfloat));
+    if (new_arrows_colors_ptr) stack->buffer_colors_origin = new_arrows_colors_ptr;
+    else                       perror("In graphics.erase_arrow(), can't re_allocate for arrows colors buffer.\n");
+
+    /*  Il ne faut pas réécrire ce qui suit: ces lignes dessinent maintenant à partir d'autres vertex */
+    /* void *new_arrows_lines_ptr = g_realloc(stack->buffer_lines_origin, stack->buffer_lines_size * sizeof(GLfloat)); */
+    /* if (new_arrows_lines_ptr) stack->buffer_lines_origin = new_arrows_lines_ptr; */
+    /* else                      perror("In graphics.erase_arrow(), can't re_allocate for arrows lines buffer.\n"); */
+
+    return arrows_nb;
+}
+
+
+
+/*
+ * Creates or deletes an arrow or modify the load of an existing one
+ * Acts both by writing the list of arrows : (struct arrow_t *arrows_ptr, int arrows_nb)
+ *       and by drawing in the global space
+ *
+ * @param   arrows_ptr and arrows_nb before operation,
+ *          required load and address (site, x, y, z)
+ *
+ *          IF      there is no arrow at the required address,
+ *          AND IF  the load is > 0, an arrow will be created.
+ *
+ *          IF      there is an arrow at the required address
+ *          AND IF  the load is = 0, the existing arrow will be deleted.
+ *
+ *          IF      there is an arrow at the required address
+ *          AND IF  the load is > 0, the load of the existing arrow will be modified.
+ *
+ *          May not call any of these three functions IF :
+ *           - Current_weight of an arrow located at the requested address == requested_weight
+ *           - No arrow was found at the requested addres AND current_weight == requested_weight
+ *
+ * @return  arrows_nb after operation
+ */
+int set_arrow (int stack_id,
+               int arrows_nb,
+               int space_X,
+               int space_Y,
+               int space_Z,
+               int requested_weight,
+               int site,
+               int arrow_x,
+               int arrow_y,
+               int arrow_z)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    int address = -1, current_weight = -1;
+
+    for (int i = 0; i < arrows_nb; i++)
+        if ((site       ==  stack->arrows_ptr[i].site)
+        &&  (arrow_x    ==  stack->arrows_ptr[i].x)
+        &&  (arrow_y    ==  stack->arrows_ptr[i].y)
+        &&  (arrow_z    ==  stack->arrows_ptr[i].z))
+        {
+            address = i;
+            current_weight = stack->arrows_ptr[i].load;
+            break;
+        }
+    assert (address <= arrows_nb);
+
+    if (address == -1 && requested_weight  > 0)
+        return create_arrow (stack_id, arrows_nb, space_X, space_Y, space_Z, requested_weight, site, arrow_x, arrow_y, arrow_z);
+    if (address >=  0 && requested_weight == 0) //   address >=  0  if and only if  arrows_nb > 0
+        return erase_arrow(stack_id, arrows_nb, address, site, arrow_x, arrow_y, arrow_z);
+    if (address >=  0 && current_weight != requested_weight) {
+        rewrite_arrow(stack_id, address, requested_weight, site, arrow_x, arrow_y, arrow_z);
+        return arrows_nb;
+    }
+
+    return arrows_nb;
+}
+

src/graphics/displays.c

@@ -0,0 +1,295 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include "../../include/graphics.h"
+
+/* Prints the arrows[] array
+ *
+ * For each arrow the following parameters are displayed :
+ * - rank in the array
+ * - load (or weight)
+ * - coordinates in space (site, x, y, z)
+ */
+void print_arrows_array (struct arrow_t *arrows, int arrows_nb, int invoked_by)
+{
+    printf("   [rank]   load | site  x    y    z        (");
+    switch (invoked_by) {
+    case 0: printf("after deletion)   arrows_nb : %d", arrows_nb); break;
+    case 1: printf("after creation)   arrows_nb : %d", arrows_nb); break;
+    case 2: printf("after modification)  arrows_nb : %d", arrows_nb); break;
+    case 3: printf("address >=  0 && current_weight == requested_weight)"); break;
+    case 4: printf("address == -1 && requested_weight == 0)"); break;
+    case 5: printf("print_user_choices)"); break;
+    case 6: printf("print_evolution)"); break;
+    case 7: printf("before deletion)  arrows_nb : %d", arrows_nb); break;
+    }
+    for (int i = 0; i < arrows_nb; i++)
+        printf("\n   [%4d] =  %2d  | %2d,  %2d,  %2d,  %2d", i, arrows[i].load,\
+               arrows[i].site, arrows[i].x, arrows[i].y, arrows[i].z);
+    if (arrows_nb == 0) printf("\n   [NULL]   ---- | ---- ---  ---  ---");
+    printf("\n");
+}
+
+
+/* Prints the initial user choices :
+ * - space dimension size and appearance (grids)
+ * - arrows[] array
+ *   NB The space may be empty or saturated with arrows or any value in between
+ *      Only one arrow per possible coordinates with a load max equal to ? TODO
+ */
+void print_user_choices(struct arrow_t *arrows, int max_arrows_nb, int arrows_nb,
+                        int space_size_x, int space_size_y, int space_size_z,
+                        int show_array, int show_space_design)
+{
+    printf("model + user constraints :\tspace size x,y,z (%d,%d,%d)\tinitial (max) arrows nb : %d",\
+           space_size_x, space_size_y, space_size_z, max_arrows_nb);
+
+    if (show_space_design)      printf(" (grilles alternées)");
+    printf("\n");
+
+    if (show_array) print_arrows_array (arrows, arrows_nb, 5);
+}
+
+/* Prints the evolution after adding / removing arrows :
+ * - arrows[] array
+ *   NB The space may be empty or saturated with arrows or any value in between
+ *      Only one arrow per possible coordinates with a load max equal to ? TODO
+ *
+ *
+ * print_evolution (arrows, added, mem, deleted, print_arrows_data);
+ */
+void print_evolution (struct arrow_t *arrows, int arrows_nb, int modified, int deleted, int show_array)
+{
+    printf("evolution\t\t\t\t\t\t\tarrows nb > %6d\t (%d added  /  %d deleted)  (modified : %d)\n",\
+           arrows_nb + modified - deleted * 2, modified - deleted, deleted, modified);
+    if (show_array) print_arrows_array (arrows, arrows_nb, 6);
+}
+
+/*
+ * Prints the arrows[] array
+ *
+ * For each arrow the following parameters are displayed :
+ * - rank in the array
+ * - weight (or load)
+ * - coordinates in space (site, x, y, z)
+ */
+void show_arrows_array_head(int one_batch_size, long nb_batches_specified, int verbose) {
+    printf("\n   [rank]   load | site  x    y    z");
+    if (verbose) printf("        one batch size = %d  nb_batches_specified = %ld",\
+           one_batch_size, nb_batches_specified);
+}
+void show_one_arrow_in_array(struct arrow_t *arrows, int i) {
+    printf("\n   [%4d] =  %2d  | %2d,  %2d,  %2d,  %2d",\
+        i, arrows[i].load, arrows[i].site, arrows[i].x, arrows[i].y, arrows[i].z);
+}
+void show_empty_arrows_array() {printf("\n   [NULL]   ---- | ---- ---  ---  ---");}
+
+void show_arrows_array (struct arrow_t *arrows, int arrows_nb, int x, int y, int z)
+{
+    show_arrows_array_head (0,0,0);
+    for (int i = 0; i < arrows_nb; i++)
+        show_one_arrow_in_array(arrows, i);
+    if (arrows_nb == 0) show_empty_arrows_array();
+}
+
+
+
+/*
+ * Prints the initial user choices :
+ * - space dimension size and appearance (grids)
+ * - arrows[] array
+ *   NB The space may be empty or saturated with arrows or any value in between
+ *      To assert : Only one arrow per possible coordinates with a load max equal to ?
+ */
+void show_user_choices(long copy_nb_arrows_specified,
+                       int space_size_x, int space_size_y, int space_size_z,
+                       int prefer, int arbitrary, int one_batch_size)
+{
+    printf("\nnb arrows specified = %ld", copy_nb_arrows_specified);
+    printf("     space size (x,y,z) = (%d,%d,%d)", space_size_x, space_size_y, space_size_z);
+    printf("     arbitrary = %d     one_batch_size = %d", arbitrary, one_batch_size);
+    if (prefer == 0)    printf("     prefer = %d <> show all grids",  prefer);
+    if (prefer == 1)    printf("     prefer = %d <> show no grid",    prefer);
+    if (prefer  > 1)    printf("     show grids according rule (%d)", prefer);
+}
+
+
+/*
+ * Prints the result of the function set_arrow()
+ * and indicates the reasons of the choice (call) this function makes (see this function)
+ */
+#define TEST 0
+void show_user_action(struct arrow_t *arrows, int arrows_nb, int address, int requested_weight,
+                             int current_weight, int site, int x, int y, int z)
+{
+    if (address == -1 && requested_weight  > 0) {   //  *(arrows + i * 5 + 0)
+        printf("no such arrow found (%2d,%2d,%2d,%2d)", site, x, y, z); //arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4]);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  CREATE"); return;}
+
+    if (address >=  0 && requested_weight == 0) {
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;  current_weight = %2d;", site, x, y, z, address, current_weight); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  ERASE"); return;}
+
+    if (address >=  0 && current_weight != requested_weight) {
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;  current_weight = %2d;", site, x, y, z, address, current_weight); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  MODIFY"); return;}
+
+    if (address >=  0 && current_weight == requested_weight){
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;", site, x, y, z, address); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("requested_weight == current_weight  =>  END"); return;}
+
+    if (address == -1 && requested_weight == 0) {
+        printf("no such arrow found (%2d,%2d,%2d,%2d)", site, x, y, z); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4]);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  END"); return;}
+}
+
+
+
+/*
+ * Prints vertex and lines buffers_states (sizes) at major one_batch_sizes and at the end of a session.
+ * Major one_batch_sizes are creation of grids and creation of arrows
+ * Arithmetic verification is provided at each one_batch_size
+ */
+void show_buffers_states(int space_X, int space_Y, int space_Z,
+                         long nb_batches_specified, int one_batch_size,
+                         int offset_after_grids, int buffer_vertex_size,
+                         int buffer_lines_size_after_cubes, int buffer_lines_size)
+{
+    int offset_after_arrows = buffer_vertex_size / 3, difference = offset_after_arrows - offset_after_grids;
+
+    printf("\n       -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -");
+
+    printf("\n      buffer_vertex_offset_after grids = %9d\t%9d  = (x+1)*(y+1)*(z+1);  <-->  (x,y,z = %d,%d,%d)",\
+           offset_after_grids, (space_X + 1)*(space_Y + 1)*(space_Z + 1), space_X, space_Y, space_Z);
+
+    printf("\n     buffer_vertex_offset_after arrows = %9d\t%9d  = %d + %d;  <-->  %d = 12 x %d  (%d cubes)",\
+           offset_after_arrows, offset_after_arrows, offset_after_grids,\
+                  difference, difference, difference / 12, difference / 12);
+
+    printf("\n       buffer_lines_offset after cubes = %9d\t%9d  = 2 * (%dx%d + %dx%d + %dx%d);  <-->  2 * (x*y + x*z + y*z)",\
+           buffer_lines_size_after_cubes, ((space_X+1) * (space_Y+1) + (space_X+1) * (space_Z+1) + (space_Y+1) * (space_Z+1)) * 2,
+           space_X+1, space_Y+1, space_X+1, space_Z+1, space_Y+1, space_Z+1);
+
+    printf("\n      buffer_lines_offset after arrows = %9d\t%9d  = %d + %d;  <-->  %d = 14 x %d  (%d arrows drawned)",\
+           buffer_lines_size, buffer_lines_size, buffer_lines_size_after_cubes,\
+           buffer_lines_size - buffer_lines_size_after_cubes,\
+           buffer_lines_size - buffer_lines_size_after_cubes, (buffer_lines_size - buffer_lines_size_after_cubes) / 14,\
+           (buffer_lines_size - buffer_lines_size_after_cubes) / 14);
+
+    if (nb_batches_specified * one_batch_size == 0) printf("\n");
+    else printf("\n     WARNING  Arrows of the same address, whatever their weight, are drawn in superimposition. Check their list.");
+
+    printf("\n   It happens that NOT all the specified arrows (%ld) = (%ld x %d) are drawned (%d) !  WHY ?  (d = %ld)\n",\
+           nb_batches_specified * one_batch_size, nb_batches_specified, one_batch_size, (buffer_lines_size - buffer_lines_size_after_cubes) / 14,\
+           nb_batches_specified * one_batch_size - (buffer_lines_size - buffer_lines_size_after_cubes) / 14);
+}
+
+
+
+/*
+ * Prints the result of the function set_arrow()
+ * and indicates the reasons of the choice (call) this function makes (see this function)
+ */
+void print_user_action(struct arrow_t *arrows, int arrows_nb, int address, int requested_weight,
+                             int current_weight, int site, int x, int y, int z)
+{
+    if (address == -1 && requested_weight  > 0) {   //  *(arrows + i * 5 + 0)
+        printf("no such arrow found (%2d,%2d,%2d,%2d)", site, x, y, z); //arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4]);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  CREATE"); return;}
+
+    if (address >=  0 && requested_weight == 0) {
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;  current_weight = %2d;", site, x, y, z, address, current_weight); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  ERASE"); return;}
+
+    if (address >=  0 && current_weight != requested_weight) {
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;  current_weight = %2d;", site, x, y, z, address, current_weight); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  MODIFY"); return;}
+
+    if (address >=  0 && current_weight == requested_weight){
+        printf("arrow (%2d,%2d,%2d,%2d) found at address %2d;", site, x, y, z, address); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("requested_weight == current_weight  =>  END"); return;}
+
+    if (address == -1 && requested_weight == 0) {
+        printf("no such arrow found (%2d,%2d,%2d,%2d)", site, x, y, z); // arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4]);
+        if (! TEST) printf("\n                                                  "); else printf("  ");
+        printf("=>  END"); return;}
+}
+
+
+
+
+
+static inline void print_buffers_array_head ()  {printf("   [rank]   load | site  x    y    z       [address]          buffer-vertex-1           buffer-vertex-2            buffer-lines\n");}
+static inline void print_empty_buffers_array () {printf("   [NULL]   ---- | ---- ---  ---  ---         -1                   ---                       ---                        ---\n");}
+
+static void print_one_arrow_in_buffers (struct arrow_t *arrows,
+    GLfloat *buffer_vertex_origin, long buffer_vertex_0_arrow,
+    GLfloat *buffer_lines_origin, long buffer_lines_0_arrow,
+    int i, int arrows_nb, int address)
+{
+    printf("   [%4d] =  %2d  | %2d,  %2d,  %2d,  %2d,        (%2d)        %6.2f  %6.2f  %6.2f    %6.2f  %6.2f  %6.2f           %4f  %4f\n",\
+        i,
+        arrows[i].load,        arrows[i].site,        arrows[i].x,        arrows[i].y,        arrows[i].z,
+        address,
+
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 0],
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 1],
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 2],
+
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 3],
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 4],
+        buffer_vertex_origin [buffer_vertex_0_arrow + i * 6 + 5],
+
+        buffer_lines_origin  [buffer_lines_0_arrow  + i * 2 + 0],
+        buffer_lines_origin  [buffer_lines_0_arrow  + i * 2 + 1]);
+}
+
+void print_vertex_and_lines_buffers (struct arrow_t *arrows_ptr, int arrows_nb,
+        GLfloat *buffer_vertex_origin, long buffer_vertex_0_arrow,
+        GLfloat *buffer_lines_origin, long buffer_lines_0_arrow,
+        int address, int requested_weight, int current_weight, int site, int x, int y, int z)
+{
+    /* for (int i = 0; i < 6; i++) printf("%5.2f ", buffer_vertex_origin [buffer_vertex_0_arrow + i]); printf("\n"); */
+    /* for (int i = 0; i < 6; i++) printf("%5.2f ", buffer_lines_origin [buffer_lines_0_arrow + i]); printf("\n"); */
+    print_buffers_array_head ();
+    for (int i = 0; i < arrows_nb; i++)
+        print_one_arrow_in_buffers(arrows_ptr, buffer_vertex_origin, buffer_vertex_0_arrow,
+                                   buffer_lines_origin, buffer_lines_0_arrow, i, arrows_nb, address);
+    if (arrows_nb == 0) print_empty_buffers_array();
+}
+
+
+
+

src/graphics/draw.c

@@ -0,0 +1,207 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ *  Writes values to describe a vertex at (x,y,z) intoq the vertex buffer
+ *
+ *  @param coords GLfloat(x,y,z)
+ *
+ *  @return void
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+
+void graphics_draw_vertex (const int stack_id,
+                           GLfloat x,
+                           GLfloat y,
+                           GLfloat z)
+{
+    g_printerr("stack_id is %d\n", stack_id);
+    g_printerr("stack_id is %d\n", stack_id);
+    g_printerr("graphic_stack is at %p\n", graphic_stack);
+    g_printerr("graphic_stack[stack_id] is at %p\n", graphic_stack + stack_id);
+    volatile struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    g_printerr("Currently stack->buffer_vertex_origin @ %p\n", stack->buffer_vertex_origin);
+
+    //assert (stack->buffer_vertex_origin);
+
+    stack->buffer_vertex_origin =
+            g_realloc (stack->buffer_vertex_origin,
+                       (stack->buffer_vertex_size + 3) * sizeof(GLfloat));
+    print_stack(stack_id);
+
+    stack->buffer_vertex_origin[stack->buffer_vertex_size + 0] = x;
+    stack->buffer_vertex_origin[stack->buffer_vertex_size + 1] = y;
+    stack->buffer_vertex_origin[stack->buffer_vertex_size + 2] = z;
+
+    stack->buffer_vertex_size += 3;
+}
+
+/*
+ *  Writes values to describe a color (r,g,b) into the color buffer
+ *
+ *  @param color GLfloat(r,g,b)
+ *
+ *  @return void
+ */
+void graphics_draw_color (const int stack_id,
+                          GLfloat r,
+                          GLfloat g,
+                          GLfloat b)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    stack->buffer_colors_origin = g_realloc (stack->buffer_colors_origin,
+                                     (stack->buffer_colors_size + 3) * sizeof(GLfloat));
+
+    assert (stack->buffer_colors_origin);
+
+    stack->buffer_colors_origin[stack->buffer_colors_size + 0] = r;
+    stack->buffer_colors_origin[stack->buffer_colors_size + 1] = g;
+    stack->buffer_colors_origin[stack->buffer_colors_size + 2] = b;
+
+    stack->buffer_colors_size += 3;
+}
+
+/*
+ *  Writes values to describe a line from a to b into the line buffer
+ *
+ *  @param coords GLuint (a,b)
+ *
+ *  @return void
+ */
+void graphics_draw_line (const int stack_id,
+                         GLuint a,
+                         GLuint b)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    stack->buffer_lines_origin = g_realloc (stack->buffer_lines_origin,
+                                    (stack->buffer_lines_size + 2) * sizeof(GLuint));
+
+    assert (stack->buffer_lines_origin);
+
+    stack->buffer_lines_origin[stack->buffer_lines_size + 0] = a;
+    stack->buffer_lines_origin[stack->buffer_lines_size + 1] = b;
+
+    stack->buffer_lines_size += 2;
+}
+
+/*
+ *  Writes values to describe an (a,b,c) plan (triangle) into the plan buffer
+ *
+ *  @param coords GLuint (a,b,c)
+ *
+ *  @return void
+ */
+void graphics_draw_plan (const int stack_id,
+                         GLuint a,
+                         GLuint b,
+                         GLuint c)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    stack->buffer_plans_origin = g_realloc (stack->buffer_plans_origin,
+                                    (stack->buffer_plans_size + 3) * sizeof(GLuint));
+
+    assert (stack->buffer_plans_origin);
+
+    stack->buffer_plans_origin[stack->buffer_plans_size + 0] = a;
+    stack->buffer_plans_origin[stack->buffer_plans_size + 1] = b;
+    stack->buffer_plans_origin[stack->buffer_plans_size + 2] = c;
+
+    stack->buffer_plans_size += 3;
+}
+
+/*
+ * Draws the current buffer to a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  void
+ */
+void graphics_draw(const int stack_id)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    //g_printerr("[debug] graphics_draw() started\n");
+
+    //print_stack(stack_id);
+
+    float m[16];
+    float v[16];
+    float p[16];
+
+    // XXX TODO get stack from stack_id
+
+    /* Compute the model view projection matrix using the
+     * rotation angles specified through the GtkRange widgets
+     */
+    compute_mvp(p,
+                stack->rotation_angles[X_AXIS],
+                stack->rotation_angles[Y_AXIS],
+                stack->rotation_angles[Z_AXIS]);
+    compute_i(m);
+    compute_i(v);
+
+    /* Use our shaders */
+    glUseProgram(stack->program);
+
+    glClearColor(0, 0, 0, 1);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    /* Update the "mvp" matrix we use in the shader */
+    glUniformMatrix4fv(stack->m, 1, GL_FALSE, &m[0]);
+    glUniformMatrix4fv(stack->v, 1, GL_FALSE, &v[0]);
+    glUniformMatrix4fv(stack->p, 1, GL_FALSE, &p[0]);
+
+    /* Use the vertices in our buffer */
+    glEnableVertexAttribArray(0);
+    glBindBuffer(GL_ARRAY_BUFFER, stack->position_buffer);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
+
+    // couleurs
+    glEnableVertexAttribArray(1);
+    glBindBuffer(GL_ARRAY_BUFFER, stack->color_buffer);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
+
+    //glEnable(GL_DEPTH_TEST);
+
+    glDrawElements(GL_LINES, stack->buffer_lines_size, GL_UNSIGNED_INT, stack->buffer_lines_origin);
+    glDrawElements(GL_TRIANGLES, stack->buffer_plans_size, GL_UNSIGNED_INT, stack->buffer_plans_origin);
+
+    /* We finished using the buffers and program */
+    glDisableVertexAttribArray(0);
+    glDisableVertexAttribArray(1);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glUseProgram(0);
+
+    glFlush();
+    //g_printerr("[debug] graphics_draw() ended\n");
+}

src/graphics/graphics.c

@@ -0,0 +1,305 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+
+#define TEST 0
+
+struct graphic_stack_t *graphic_stack = NULL;
+size_t graphic_stack_size = 0;
+int *free_stack_slot = NULL;
+size_t free_stack_slot_size = 0;
+
+/*
+ * Prints verbose human-readable debug messages
+ *
+ * @param   source, XXX
+ *          type, XXX
+ *          id, XXX
+ *          severity, XXX
+ *          length, XXX
+ *          msg, XXX
+ *          data, XXX
+ *
+ * @return  void
+ */
+static void graphics_debug_callback(GLenum source, GLenum type, GLuint id,
+                                    GLenum severity, GLsizei length,
+                                    const GLchar *msg, const void *data)
+{
+    const char *errsource;
+    const char *errtype;
+    const char *errseverity;
+    const GLubyte *string;
+    GLenum code;
+
+    switch (source) {
+    case GL_DEBUG_SOURCE_API:               errsource = "API";              break;
+    case GL_DEBUG_SOURCE_WINDOW_SYSTEM:     errsource = "WINDOW SYSTEM";    break;
+    case GL_DEBUG_SOURCE_SHADER_COMPILER:   errsource = "SHADER COMPILER";  break;
+    case GL_DEBUG_SOURCE_THIRD_PARTY:       errsource = "THIRD PARTY";      break;
+    case GL_DEBUG_SOURCE_APPLICATION:       errsource = "APPLICATION";      break;
+    case GL_DEBUG_SOURCE_OTHER:             errsource = "UNKNOWN";          break;
+    default:                                errsource = "UNKNOWN";          break;
+    }
+
+    switch (type) {
+    case GL_DEBUG_TYPE_ERROR:               errtype = "ERROR";              break;
+    case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: errtype = "DEPRECATED BEHAVIOR";break;
+    case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:  errtype = "UNDEFINED BEHAVIOR"; break;
+    case GL_DEBUG_TYPE_PORTABILITY:         errtype = "PORTABILITY";        break;
+    case GL_DEBUG_TYPE_PERFORMANCE:         errtype = "PERFORMANCE";        break;
+    case GL_DEBUG_TYPE_OTHER:               errtype = "OTHER";              break;
+    case GL_DEBUG_TYPE_MARKER:              errtype = "MARKER";             break;
+    default:                                errtype = "UNKNOWN";            break;
+    }
+
+    switch (severity) {
+    case GL_DEBUG_SEVERITY_HIGH:            errseverity = "CRITICAL";       break;
+    case GL_DEBUG_SEVERITY_MEDIUM:          errseverity = "ERROR";          break;
+    case GL_DEBUG_SEVERITY_LOW:             errseverity = "WARNING";        break;
+    case GL_DEBUG_SEVERITY_NOTIFICATION:    errseverity = "INFO";           break;
+    default:                                errseverity = "UNKNOWN";        break;
+    }
+
+    code = glGetError();
+    string = gluErrorString(code);
+
+    g_printerr("[%s] %s (%s) from %s: %s\n",
+           errseverity, string, errtype, errsource, msg);
+}
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Initializes graphical stack
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  id if initialized
+ */
+int graphics_init(void *error_buffer)
+{
+    int cur_id = 0;
+    struct graphic_stack_t *stack;
+
+    /* g_printerr("[debug] graphics_init()\n"); */
+
+    if (graphic_stack == NULL) {
+        graphic_stack = g_malloc0(sizeof(struct graphic_stack_t));
+        graphic_stack_size = 1;
+        /* g_printerr("[debug] graphics_init(): init graphic_stack @ %p\n", graphic_stack); */
+    } else {
+        // Check if there are free slots
+        if (free_stack_slot_size) {
+            // We get the last free slot registered
+            cur_id = free_stack_slot[free_stack_slot_size-1];
+            // Unregister it (ofc)
+            free_stack_slot = g_realloc(free_stack_slot,
+                                        free_stack_slot_size-- *
+                                        sizeof(int));
+        } else {
+            cur_id = graphic_stack_size;
+            graphic_stack = g_realloc(graphic_stack,
+                                      ++graphic_stack_size *
+                                        sizeof(struct graphic_stack_t));
+        }
+    }
+
+    memset(&graphic_stack[cur_id], 0, sizeof(struct graphic_stack_t));
+
+    /* g_printerr("[debug] graphics_init() : graphic_stack (@0x%p) has %ld elements\n", */
+    /*            graphic_stack, */
+    /*            graphic_stack_size); */
+
+    stack = &graphic_stack[cur_id];
+    stack->id = cur_id;
+
+    glEnable(GL_DEBUG_OUTPUT);
+    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+    glEnable(GL_MULTISAMPLE);
+
+    if (!graphics_init_shaders(cur_id))
+        return -1;
+
+    //print_stack(cur_id);
+
+    graphics_init_buffers(cur_id);
+
+    glDebugMessageCallback(graphics_debug_callback, NULL);
+
+    print_stack(cur_id);
+
+    return cur_id;
+}
+
+/*
+ * Shutdowns a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if success
+ */
+bool graphics_shutdown(const int id, void *error_buffer)
+{
+    struct graphic_stack_t *stack;
+
+    if (id >= graphic_stack_size ||
+        graphic_stack_size == 0 ||
+        graphic_stack == NULL)
+        return false;
+
+    stack = &graphic_stack[id];
+
+    glDeleteBuffers(1, &stack->position_buffer);
+    glDeleteBuffers(1, &stack->color_buffer);
+    glDeleteProgram(stack->program);
+
+    g_free(stack->buffer_vertex_origin);
+    g_free(stack->buffer_colors_origin);
+    g_free(stack->buffer_lines_origin);
+    g_free(stack->buffer_plans_origin);
+
+    if (graphic_stack_size == 1) {
+        free(graphic_stack);
+        graphic_stack = NULL;
+        graphic_stack_size = 0;
+    } else {
+        memset(&graphic_stack[id], 0, sizeof(struct graphic_stack_t));
+        free_stack_slot = g_realloc(free_stack_slot,
+                                    ++free_stack_slot_size *
+                                    sizeof(int));
+        free_stack_slot[free_stack_slot_size-1] = id;
+    }
+
+    return true;
+}
+
+/* TODO
+ * #pragma omp parallel schedule(static, 12)
+ * void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void) {}
+ *
+//  assert : space dimensions (x,y,z) > 0
+//  assert : arrows localization within space and sites
+//  assert : no more than one arrow per address
+//  notify : weights are replaced, NOT added (could be !)
+ *
+ * Init space and arrows (= initial state)
+ * and allows ulterior creations, suppressions or modifications of the arrows[] array
+ *
+ * draws the space()
+ * triggers set_arrows() that modifies the list () and draws arrows
+ *
+ *  Initialisation du générateur pseudo-aléatoire
+ *  Attention, les vertex centraux de chaque unité d'espace (cube)
+ *          peuvent être redondants (max 6)
+*/
+void main_test_graphics (const int stack_id)
+{
+    /*------------------------------------------------------------------------*/
+
+    /*         I N I T I A L    D A T A   S P E C I F I C A T I O N           */
+
+    /*------------------------------------------------------------------------*/
+
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    srand(time(NULL)); int rand(void); void srand(unsigned int seed);
+    int randomize = 10, console = 0, space_X = 1, space_Y = 1, space_Z = 1;
+
+    stack->arrows_nb = 0;
+
+    if (randomize) {
+        space_X = 1 + rand() % randomize;
+        space_Y = 1 + rand() % randomize;
+        space_Z = 1 + rand() % randomize;
+    }
+    int density_max = space_X * space_Y * space_Z, specified_arrows_nb = density_max;
+    /* int max = fmax(space_X, space_Y); max = fmax(max, space_Z); */
+
+
+    /*------------------------------------------------------------------------*/
+
+    /*                       S P A C E    D R A W I N G                       */
+
+    /*------------------------------------------------------------------------*/
+
+    draw_space_ridges_vertex (stack_id, stack->buffer_vertex_size,
+                              space_X, space_Y, space_Z);
+    draw_space_ridges_lines (stack_id);
+    draw_grids_on_space_faces_vertex (stack_id, space_X, space_Y, space_Z);
+    draw_grids_on_space_faces_lines (stack_id, stack->buffer_lines_size,
+                                     space_X, space_Y, space_Z);
+
+    stack->buffer_vertex_0_arrow =
+        stack->buffer_vertex_size;
+    stack->buffer_colors_0_arrow =
+        stack->buffer_colors_size;
+    stack->buffer_lines_0_arrow =
+        stack->buffer_lines_size;
+
+
+    /*------------------------------------------------------------------------*/
+
+    /*                     A R R O W S    D R A W I N G                       */
+
+    /*------------------------------------------------------------------------*/
+
+
+    if (randomize) for (int i = 0; i < specified_arrows_nb; i++)
+        {
+        stack->arrows_nb =
+            set_arrow (stack_id, stack->arrows_nb, space_X, space_Y, space_Z,
+                               1,                   //    load
+                               rand() % 6,          //    site
+                               rand() % space_X,    //    x
+                               rand() % space_Y,    //    y
+                               rand() % space_Z);   //    z
+
+            if (i > 0 && i % 1000 == 0) printf("|");
+            if (i > 0 && i % 100000 == 0) printf("\n");
+        }
+    else for (int i = 0; i < 6; i++)
+        stack->arrows_nb =
+            set_arrow (stack_id, stack->arrows_nb, 1, 1, 1, 1, i, 0, 0, 0);
+
+    int max_arrows_nb = stack->arrows_nb;
+
+    /*--------------------------------------------------------------------------------*/
+
+    /*                                  F R E E                                       */
+
+    /*     ( F R E E   'S P A C E' :   S E E    G R A P H I C   S H U T D O W N )     */
+
+    /*--------------------------------------------------------------------------------*/
+
+    free(stack->arrows_ptr);
+    stack->arrows_ptr = NULL;
+    stack->arrows_nb = 0;
+}
+

src/graphics/grid.c

@@ -0,0 +1,162 @@
+/*
+ *      Gem-graph
+ *
+ *      Desc: OpenGL grid functions
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+
+int draw_space_ridges_vertex (const int stack_id,
+                              long offset_vertex,
+                              long x,
+                              long y,
+                              long z)
+{
+    GLfloat max = fmax(x, y);  max = fmax(max, z);
+
+    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex - y / max, - z / max);
+
+    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex - y / max, - z / max);
+    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex + y / max, - z / max);
+    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex - y / max, + z / max);
+
+    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex + y / max, - z / max);
+    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex - y / max, + z / max);
+    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex + y / max, + z / max);
+
+    graphics_draw_vertex (stack_id, offset_vertex + x / max, + y / max, + z / max);
+
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
+
+    return 8;
+}
+
+int draw_space_ridges_lines (const int stack_id)
+{
+    graphics_draw_line (stack_id, 0, 1); graphics_draw_line (stack_id, 7, 4);
+    graphics_draw_line (stack_id, 0, 2); graphics_draw_line (stack_id, 7, 5);
+    graphics_draw_line (stack_id, 0, 3); graphics_draw_line (stack_id, 7, 6);
+
+    graphics_draw_line (stack_id, 1, 4); graphics_draw_line (stack_id, 2, 4);
+    graphics_draw_line (stack_id, 1, 5); graphics_draw_line (stack_id, 3, 5);
+    graphics_draw_line (stack_id, 2, 6); graphics_draw_line (stack_id, 3, 6);
+
+    return 12;
+}
+
+long draw_grids_on_space_faces_vertex (const int stack_id,
+                                       long x,
+                                       long y,
+                                       long z)
+{
+    float i, max = fmax(x, y); max = fmax(max, z);
+
+    for (i = 1; i < x; i++) {
+
+        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max, - y / max, - z / max);
+        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max, - y / max,   z / max);
+        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max,   y / max,   z / max);
+        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max,   y / max, - z / max);
+
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+    }
+
+    /* offset_vertex += (x - 1) * 4;     */ /* offset_colors += (x - 1) * 4; */
+
+    for (i = 1; i < y; i++) {
+
+        graphics_draw_vertex (stack_id, - x / max, (2 * i / y - 1) * y / max, - z / max);
+        graphics_draw_vertex (stack_id, - x / max, (2 * i / y - 1) * y / max,   z / max);
+        graphics_draw_vertex (stack_id, x / max, (2 * i / y - 1) * y / max,   z / max);
+        graphics_draw_vertex (stack_id, x / max, (2 * i / y - 1) * y / max, - z / max);
+
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+    }
+
+    /* offset_vertex += (y - 1) * 4;     */ /* offset_colors += (y - 1) * 4; */
+
+    for (i = 1; i < z; i++) {
+
+        graphics_draw_vertex (stack_id, - x / max, - y / max, (2 * i / z - 1) * z / max);
+        graphics_draw_vertex (stack_id, - x / max,   y / max, (2 * i / z - 1) * z / max);
+        graphics_draw_vertex (stack_id, x / max,   y / max, (2 * i / z - 1) * z / max);
+        graphics_draw_vertex (stack_id, x / max, - y / max, (2 * i / z - 1) * z / max);
+
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
+    }
+
+    return (x + y + z - 3) * 3;
+}
+
+
+long draw_grids_on_space_faces_lines (const int stack_id,
+                                      long offset_vertex,
+                                      long x,
+                                      long y,
+                                      long z)
+{
+    offset_vertex = offset_vertex / 3;
+
+    for (int i = 0; i < x - 1; i ++) {
+
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 1,  offset_vertex + i * 4 + 2);
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
+    }
+
+    offset_vertex += (x - 1) * 4;
+
+    for (int i = 0; i < y - 1; i ++) {
+
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
+    }
+
+    offset_vertex += (y - 1) * 4;
+
+    for (int i = 0; i < z - 1; i ++) {
+
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 0,  offset_vertex + i * 4 + 1);
+            graphics_draw_line (stack_id, offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
+    }
+
+    return (x + y + z - 3) * 4;
+}
+

src/graphics/init.c

@@ -0,0 +1,175 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* -------------------------------------------------------------------------- */
+
+#include <stdlib.h>
+#include <time.h>
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+
+/* Initializes the buffer of a gl_area
+ * Calls according to the user preferences
+ * @param   gl_area, ptr to the gl_area widget
+ * @return  void
+ */
+void graphics_init_buffers(const int stack_id)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+
+    //XXX
+    main_test_graphics (stack_id);
+
+    GLuint vao, vertex_buffer, color_buffer;
+
+    glGenBuffers(1, &vertex_buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+    glBufferData(GL_ARRAY_BUFFER,
+                 stack->buffer_vertex_size *
+                    sizeof(stack->buffer_vertex_origin[0]),
+                 stack->buffer_vertex_origin,
+                 GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+
+    // colors
+    glGenBuffers(1, &color_buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, color_buffer);
+    glBufferData(GL_ARRAY_BUFFER, stack->buffer_colors_size *
+                    sizeof(stack->buffer_colors_origin[0]),
+                 stack->buffer_colors_origin,
+                 GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    // We only use one VAO, so we always keep it bound
+    glGenVertexArrays(1, &vao);
+    glBindVertexArray(vao);
+
+    stack->vao = vao;
+    stack->position_buffer = vertex_buffer;
+    stack->color_buffer = color_buffer;
+}
+
+/*
+ * Initializes the shaders of a gl_area and link them to a program
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if initialized
+ */
+bool graphics_init_shaders(const int stack_id)
+{
+    struct graphic_stack_t *stack = &graphic_stack[stack_id];
+    char *vertex_shader;
+    char *fragment_shader;
+    int status;
+    GLuint vertex, fragment;
+    GLuint program = 0;
+    GLuint m = 0;
+    GLuint v = 0;
+    GLuint p = 0;
+
+    // Load vertex shader file
+    vertex_shader = read_file(VERTEX_SHADER_FILE);
+    if (vertex_shader == NULL)
+        return false;
+    vertex = create_shader(stack_id, GL_VERTEX_SHADER, vertex_shader);
+
+    if(vertex == 0) {
+        stack->program = 0;
+        g_free(vertex_shader);
+        return false;
+    }
+
+    // Load fragment shader file
+    fragment_shader = read_file(FRAG_SHADER_FILE);
+    if (fragment_shader == NULL)
+        return false;
+    fragment = create_shader(stack_id, GL_FRAGMENT_SHADER, fragment_shader);
+
+    if(fragment == 0) {
+        glDeleteShader(vertex);
+        stack->program = 0;
+        g_free(vertex_shader);
+        g_free(fragment_shader);
+        return false;
+    }
+
+    // Link shaders to program
+    program = glCreateProgram();
+    glAttachShader(program, vertex);
+    glAttachShader(program, fragment);
+
+    glLinkProgram(program);
+
+    glGetProgramiv(program, GL_LINK_STATUS, &status);
+
+    if(status == GL_FALSE) {
+        int log_len;
+        char *buffer;
+
+        glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len);
+
+        buffer = g_malloc(log_len + 1);
+        assert(buffer);
+        glGetProgramInfoLog(program, log_len, NULL, buffer);
+
+        g_warning("Linking failure:\n%s", buffer);
+
+        g_free(buffer);
+
+        glDeleteProgram(program);
+        program = 0;
+
+        glDeleteShader(vertex);
+        glDeleteShader(fragment);
+
+        g_free(vertex_shader);
+        g_free(fragment_shader);
+
+        return false;
+    }
+
+    /* Get the location of the "mvp" uniform */
+    m = glGetUniformLocation(program, "model_matrix");
+    v = glGetUniformLocation(program, "view_matrix");
+    p = glGetUniformLocation(program, "projection_matrix");
+
+    glDetachShader(program, vertex);
+    glDetachShader(program, fragment);
+
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+
+    stack->program = program;
+    stack->m = m;
+    stack->v = v;
+    stack->p = p;
+
+    g_free(vertex_shader);
+    g_free(fragment_shader);
+
+    return true;
+}

src/graphics/shaders/shader.frag

@@ -0,0 +1,9 @@
+#version 330 core
+
+in vec4 color;
+out vec4 out_frag_color;
+
+void main(void)
+{
+	out_frag_color = color;
+}

src/graphics/shaders/shader.vert

@@ -0,0 +1,20 @@
+#version 330 core
+
+uniform mat4 projection_matrix;
+uniform mat4 model_matrix;
+uniform mat4 view_matrix;
+
+layout(location=0) in vec3 in_position;
+layout(location=1) in vec3 in_color;
+
+out vec4 color;
+
+void main(void)
+{
+    float zoom = 1.5f, chrominance = 1, luminance = 1;
+    gl_Position =
+    	projection_matrix * view_matrix * model_matrix * vec4(in_position, zoom);
+    color = vec4 (chrominance * in_color.rgb, luminance);
+}
+
+//	https://learnopengl.com/Getting-started/Shaders

src/main.c

@@ -0,0 +1,47 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: Main file
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <gtk-4.0/gtk/gtk.h>
+
+#include "../include/base.h"
+#include "../include/ui.h"
+
+/* -------------------------------------------------------------------------- */
+
+int main(int argc, char **argv)
+{
+    g_autoptr(GemGraphClientApplication) app = NULL;
+    int res;
+
+    // bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+	// bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+	// textdomain (GETTEXT_PACKAGE);
+
+    app = gem_graph_client_application_new("org.alec.gemgraph",
+                                           G_APPLICATION_DEFAULT_FLAGS);
+
+    res = g_application_run(G_APPLICATION(app), argc, argv);
+    return res;
+}

src/parsing/parsing.c

@@ -0,0 +1,402 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <limits.h>
+#include <libxml/tree.h>
+#include <libxml/parser.h>
+#include <libxml/xmlreader.h> // http://xmlsoft.org/examples/#parse1.c
+#define VRB0 0
+#define VRB1 0
+#define VRB2 0
+#define VRB3 0
+#define VRB4 1
+
+// https://gnome.pages.gitlab.gnome.org/libxml2/devhelp/general.html
+//  make && bin/learning ./data/dimers\ random\ walk.xml
+
+/******  WARNING !  VARIABLES GLOBALES !!  ÇA PAS BON !!!  > TODO <  **********/
+
+xmlDocPtr doc; // ! WARNING !  I TAKE FOR GRANTED THAT  xmlDocPtr doc != NULL
+xmlHashTable *my_table;
+
+/******************************************************************************/
+
+bool model_init(char *docname)
+{
+ 	xmlNodePtr node; 
+ 
+	doc = xmlParseFile(docname);
+	
+	if (doc == NULL ) {
+		fprintf(stderr,"Document not parsed successfully.\n");
+		return false;
+	}
+  
+	node = xmlDocGetRootElement(doc);
+	
+	if (node == NULL) {
+		fprintf(stderr,"empty document\n");
+		xmlFreeDoc(doc);
+		return false;
+	}
+	
+	if (xmlStrcmp(node->name, (xmlChar *) "gem-graph-model")) {
+		fprintf(stderr,"document of the wrong type, root node != gem-graph-model\n");
+		xmlFreeDoc(doc);
+		return false;
+	}
+  
+  my_table = xmlHashCreate(10);
+  printf("-------------------- model_init(%s) -----------------------\n", docname);
+  
+    /* xmlDocPtr	my_tree = xmlReadIO, */
+    /* xmlInputReadCallback ioread, */
+		/* xmlInputCloseCallback ioclose, */
+		/* void * ioctx, */
+		/* const char * URL, */
+		/* const char * encoding, */
+		/* int options); */
+
+  
+  return true;
+}
+	
+/******************************************************************************/
+
+bool model_shutdown(char *docname){
+  
+  xmlFreeDoc(doc);
+  
+  printf("-------------------- model_shutdown(%s) -------------------\n", docname);
+  
+  return false;
+}
+                                                                 
+/******************************************************************************/
+
+static xmlNodePtr getNextChild(xmlNodePtr node, xmlChar *last){
+  while (node != NULL && xmlStrcmp(node->name, last)) {	
+    // printf("   <>--- line n°%lu   <%s>\n", xmlGetLineNo(node), node->name);
+    node = node->next;
+  }
+  return node;
+}
+
+static xmlChar* splitStrAtSlash(xmlChar *toSplit){
+  toSplit = (xmlChar *)xmlStrchr(toSplit, '/');
+  toSplit = xmlStrsub (toSplit, 1, xmlStrlen(toSplit));
+  return toSplit;
+}                                         
+
+static xmlChar* getFirstTag(xmlChar *path){
+  xmlChar *preop = path;
+  path = (xmlChar *)xmlStrchr(path, '/');
+  path = xmlStrsub (path, 1, xmlStrlen(path));
+  /* printf("%s = %s + / + %s\n", preop,\ */
+  /*    xmlStrsub (preop, 0, xmlStrlen(preop) - xmlStrlen(path) - 1), path); */
+  return  xmlStrsub (preop, 0, xmlStrlen(preop) - xmlStrlen(path) - 1);
+}                                      
+
+static xmlChar* getLastTag(xmlChar *path){
+  while ((ulong)xmlStrchr (path, '/')) path = splitStrAtSlash((xmlChar *)path);
+  // printf("last tag in the path = <%s>\n", path);
+  return path; // which is no more the given path but only its last tag !
+}                                      
+
+/******************************************************************************/         
+/******************************************************************************/         
+/******************************************************************************/         
+            
+static xmlNodePtr model_get_node(xmlChar *path)
+{
+  xmlNodePtr node;
+
+  // Lookup for node from path in hash table
+  node = xmlHashLookup(my_table, path);
+  
+  // Found a node in hash table
+  if(node){
+    if (VRB0) printf("xmlHashLookup   (my_table, path: <%s>,  tag: <%s> @>%p)\n",
+                        path, node->name, node);
+            
+    assert(node > (xmlNodePtr)2048);
+            
+    return node;
+  
+  // no node found in hash table
+  } else {
+    xmlChar *reste = path, *last = reste, *affich = reste;
+    last = getLastTag(last);
+    xmlNodePtr node = xmlDocGetRootElement(doc);
+            
+    if (VRB1) printf("line n° %lu : tag <%s>        reste = %s\n",\
+                xmlGetLineNo(node), (xmlChar *)node->name, (xmlChar *)affich);
+            
+    xmlChar *extrait;
+            
+    while ((ulong)xmlStrchr (reste, '/')){
+      extrait = getFirstTag(reste);         //printf("extrait = %s\n", extrait);
+      reste = splitStrAtSlash((xmlChar *)reste);//printf("reste = %s\n", reste);
+      node = node->xmlChildrenNode;
+      node = getNextChild(node, extrait);
+            
+      if (VRB1) printf("line n°%lu : tag <%s>        reste = %s\n",\
+                    xmlGetLineNo(node), (xmlChar *)extrait, (xmlChar *)reste);
+    }
+
+    if(node != NULL && xmlStrcmp(node->name, last)) {
+      node = node->xmlChildrenNode;
+
+      while (node != NULL && xmlStrcmp(node->name, last)) {	
+        node = node->next;
+      }
+
+      if (VRB1) printf("line n°%lu : tag <%s>\n",\
+               xmlGetLineNo(node), (xmlChar *)node->name);
+            
+      xmlHashAddEntry (my_table, path, node);     
+    }
+            
+    if (VRB0) printf("VRB0   xmlHashAddEntry (my_table, path: <%s>,  tag: <%s> @>%p)\n",\
+            path, node->name, node);
+          
+    return node;
+  }
+          
+  return NULL; // ?
+}
+
+/******************************************************************************/
+/******************************************************************************/         
+/******************************************************************************/         
+
+static long model_get_node_attrib(xmlNodePtr node)
+{
+  long value = 0;
+  if (node && node->properties) {
+      xmlAttr* attribute = node->properties;
+      xmlChar* value_txt = NULL;
+      char *ptr;
+      while(attribute && attribute->name && attribute->children)
+      {
+        value_txt = xmlNodeListGetString(node->doc, attribute->children, 1);
+        value = strtol((char *)value_txt, &ptr, 10);
+        if (VRB3) printf ("model_get_node_attrib <%s> = %s = %ld\n",\
+                             attribute->name, value_txt, value);
+        attribute = attribute->next;
+      } 
+  }
+  return value;
+}
+
+static long model_get_state_arrows_nb(xmlNodePtr node)
+{
+  long arrows_nb= 0;
+  if (VRB0) printf ("VRB0   model_get_state_arrows_nb <%s> start at line %ld\n",\
+                             node->name, xmlGetLineNo(node));
+  while (node && node->next){
+    if (VRB2) printf ("%s  %ld >", (xmlChar *)node->name, arrows_nb);
+    if (!xmlStrcmp(node->name, (xmlChar *)"arrow")) ++arrows_nb;
+    if (VRB2) printf (" %ld  ", arrows_nb);
+    node = node->next;
+  }
+  if (VRB2) printf ("\n");
+  if (VRB0) printf ("VRB0   model_get_state_arrows_nb = %ld     end   at line %ld\n",\
+                             arrows_nb, xmlGetLineNo(node));
+  return arrows_nb;
+}
+            
+/******************************************************************************/
+/******************************************************************************/         
+/******************************************************************************/         
+
+char model_get_dim(xmlChar *path){
+            
+  xmlNodePtr node = model_get_node(path); if (VRB2) printf("@node = %p   ", node);
+            
+  if (node && node->properties) {
+      xmlAttr* attribute = node->properties;
+      while(attribute && attribute->name && attribute->children)
+      {
+        xmlChar* value = xmlNodeListGetString(node->doc, attribute->children, 1);
+        // printf ("model_get_dim %s = %s\n", attribute->name, value);
+        xmlFree(value);
+        attribute = attribute->next;
+      }
+  }
+  
+  if (xmlHasProp (node, (xmlChar *) "z")) return 3;
+  if (xmlHasProp (node, (xmlChar *) "y")) return 2;
+  if (xmlHasProp (node, (xmlChar *) "x")) return 1;
+  return 0;
+}
+             
+int model_get_dim_value(xmlChar *path, xmlChar *axis){
+  xmlNodePtr node = model_get_node(path);
+  //xmlNodePtr node= xmlTextReadernoderentNode(reader);
+  if (node && node->properties) {
+      xmlAttr* attribute = node->properties;
+      while(attribute && attribute->name && attribute->children)
+      {
+        xmlChar* value = xmlNodeListGetString(node->doc, attribute->children, 1);
+        if (!xmlStrcmp(attribute->name, axis)) 
+            return (int)strtol((char *)value, NULL, 0);
+      }
+  }
+  
+  return 0;
+}
+
+
+ 
+char model_get_cond_tree (xmlChar *path){                                        
+  xmlNodePtr node = model_get_node(path);
+  node = node->xmlChildrenNode;
+  node = getNextChild(node, (xmlChar *)"condition");
+  node = xmlCopyNodeList (node->xmlChildrenNode);
+  printf("model_get_cond_tree(\"%s\")  >  line n°%ld\n", path, xmlGetLineNo(node));  
+  return 0;
+}
+
+int model_get_cond (xmlChar *path,  xmlChar *node_id){                                        
+  xmlNodePtr node = model_get_node(path);
+  printf("model_get_cond(...) {...node->name = %s...}\n", node->name);
+    node = getNextChild(node->next, (xmlChar *)"condition"); 
+    node = getNextChild(node->next, (xmlChar *)"condition"); 
+    if (xmlHasProp (node, (xmlChar *) "site")) {
+      printf("   node %s has attribute site\n", node->name);
+    }
+    if (xmlHasProp (node, (xmlChar *) "node_id")) {
+      printf("   node %s has attribute %s with value %hhn %s %s\n",\
+        node->name,\
+        xmlHasProp (node, (xmlChar *) "node_id")->name,\
+        xmlGetProp (node, (xmlChar *) "node_id"),\
+        (xmlChar *)"?! xmlGetProp is deprecated !",\
+        (xmlChar *)"");
+    }
+    node = getNextChild(node->next, (xmlChar *)"condition"); 
+  return 0;
+}
+              
+long model_get_dim_X (xmlChar *path){
+  xmlNodePtr node = xmlHashLookup(my_table, (xmlChar *)"get_X");
+  if(node){
+    //if (VRB1){
+      printf("get_X  >  tag <%s> found in hash table\n",\
+            node->name); // node->name = "x"
+    //}
+    return (long)xmlHashLookup(my_table, (xmlChar *)"get_X"); //TODO
+
+  }else{
+    xmlNodePtr node = model_get_node(path); // node = dimension
+    if (node && node->properties) {
+      xmlAttr* attribute = node->properties;
+      while(attribute && attribute->name && attribute->children)
+      {
+        xmlChar* value = xmlNodeListGetString(node->doc, attribute->children, 1);
+        if (!xmlStrcmp(attribute->name, (xmlChar *)"x")) {
+          xmlHashAddEntry (my_table, (xmlChar *)"get_X", attribute);
+          return (int)strtol((char *)value, NULL, 0);
+        }            
+      }
+    }
+  }
+  return 0;
+}
+
+int model_get_dim_Y (xmlChar *path){
+  printf("model_get_dim_Y(%s)\n", path);
+  return 0;
+}
+
+int model_get_dim_Z (xmlChar *path){
+  printf("model_get_dim_Z(%s)\n", path);
+  return 0;
+}
+
+int model_get_multiplicity (xmlChar *path){
+  xmlNodePtr node = model_get_node(path);
+  if(node) return (int)strtol((char *)xmlNodeGetContent(node), NULL, 0);
+  return 0;
+}
+
+int model_get_objects_list(xmlChar *path){
+  return xmlGetLineNo(model_get_node(path));
+}             
+              
+xmlChar *model_get_states_list(xmlChar *path){
+  xmlNodePtr node = model_get_node(path);
+  return (xmlChar *)xmlNodeGetContent(node);
+}
+              
+long model_get_state_arrows_count(xmlChar *path, long n){
+  // Ici, je sais que c'est le 'PREMIER' état qui est demandé car n == 0
+  char compl[] = "/state/arrow";
+  char *new_p = calloc(1, (sizeof(compl) + strlen((char *)path)) * sizeof(char));
+  strcat(new_p, (char *)path);
+  strcat(new_p + strlen((char *)path), compl);  //  printf("%s\n", new_p);
+
+  xmlNodePtr node = model_get_node((xmlChar *)new_p);
+  long size = model_get_state_arrows_nb(node);
+  int dim = model_get_dim((xmlChar *)"parameters/space-param/dimension");
+  if (VRB0) printf("VRB0   model_get_saved_state(size = %ld)->%p<-attrib  dim = %d  size = %ld\n",\
+         size, (xmlNodePtr)model_get_node_attrib(node), dim, size * ( 2 + dim ) * sizeof(int));
+
+  int c = 0;
+  int *t = calloc(1, (size * ( 2 + dim ) * sizeof(int)));
+//  int rk = 0;
+//  int *s = calloc(1, ( 2 + dim ) * sizeof(int));
+
+if(1)
+{
+  long arrows_nb= 0;
+  if (VRB4) printf ("VRB4   model_get_state_arrows_nb <%s> start at line %ld\n",\
+                             node->name, xmlGetLineNo(node));
+  while (node && node->next){
+    if (!xmlStrcmp(node->name, (xmlChar *)"arrow")) ++arrows_nb;
+    if (VRB4 && !xmlStrcmp(node->name, (xmlChar *)"arrow")) printf ("VRB4   %s-%ld ",\
+        (xmlChar *)node->name, arrows_nb);
+    if (node && node->properties) {
+      xmlAttr* attribute = node->properties;
+      while(attribute)
+        {
+          xmlChar* value = xmlNodeListGetString(node->doc, attribute->children, 1);
+          if (VRB4) printf("v=%s ", value); 
+          *(t + c) = strtol((char*)value, NULL, 0);
+          ++c;
+          xmlFree(value); 
+          attribute = attribute->next;
+        }
+      if (VRB4) printf("\n");
+    }
+    node = node->next;
+  }
+  if (VRB4) printf ("VRB4   model_get_state_arrows_nb = %ld     end   at line %ld\n",\
+                             arrows_nb, xmlGetLineNo(node));
+  if (VRB4) for(int k = 0; k < c; k++) printf("%d ", *(t + k)); printf("\n");
+  return arrows_nb;
+}
+
+ 
+ return (long) size * ( 2 + dim ) * sizeof(int);
+}
+              
+int model_get_state(xmlChar *path, xmlChar *state_id){
+  printf("model_get_state (%s -> %s state)\n", path, state_id);
+  return 0;
+}
+              
+int model_get_conditions_list(xmlChar *path){
+  printf("model_get_conditions_list(%s)\n", path);
+  return 0;
+}
+              
+int model_get_transitions_list(xmlChar *path){
+  printf("model_get_transitions_list(%s)\n", path);
+  return 0;
+}              
+
+           
+

src/ui/application.c

@@ -0,0 +1,150 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: User interface functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/ui.h"
+
+struct _GemGraphClientApplication
+{
+    GtkApplication parent_instance;
+};
+
+G_DEFINE_TYPE (GemGraphClientApplication,
+               gem_graph_client_application,
+               GTK_TYPE_APPLICATION)
+
+
+static GemGraphClientApplication *application;
+
+/* -------------------------------------------------------------------------- */
+
+void ui_enable_action(const char *name) {
+    g_simple_action_set_enabled(
+    (GSimpleAction *)g_action_map_lookup_action(
+                            G_ACTION_MAP(application),
+                            name),
+    true);
+}
+
+void ui_disable_action(const char *name) {
+    g_simple_action_set_enabled(
+    (GSimpleAction *)g_action_map_lookup_action(
+                            G_ACTION_MAP(application),
+                            name),
+    false);
+}
+
+/*
+ *  Window actual presentation on screen
+ *
+ */
+static void gem_graph_client_application_activate(GApplication *app)
+{
+    GtkWindow *window;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(app));
+
+    window = gtk_application_get_active_window(GTK_APPLICATION (app));
+    if (window == NULL)
+    window = g_object_new(GEM_GRAPH_CLIENT_TYPE_WINDOW,
+                           "application", app,
+                           NULL);
+
+    ui_set_stack(HOME_MODE);
+
+    gtk_window_present(window);
+}
+
+/*
+ *  Action records are registered here
+ *
+ */
+static void gem_graph_client_application_init(GemGraphClientApplication *self)
+{
+    g_action_map_add_action_entries(G_ACTION_MAP(self),
+                                   app_actions,
+                                   G_N_ELEMENTS(app_actions),
+                                   self);
+
+    // Setup shortcuts
+    gtk_application_set_accels_for_action(GTK_APPLICATION(self),
+                                "app.quit",
+                                (const char *[]) { "<primary>q", NULL });
+    gtk_application_set_accels_for_action(GTK_APPLICATION(self),
+                                "app.editmode",
+                                (const char *[]) { "<primary>e", NULL });
+    gtk_application_set_accels_for_action(GTK_APPLICATION(self),
+                                "app.runmode",
+                                (const char *[]) { "<primary>r", NULL });
+    gtk_application_set_accels_for_action(GTK_APPLICATION(self),
+                                "app.presentmode",
+                                (const char *[]) { "<primary>p", NULL });
+    gtk_application_set_accels_for_action(GTK_APPLICATION(self),
+                                "app.savefile",
+                                (const char *[]) { "<primary>s", NULL });
+
+    application = self;
+
+    //
+    // Disable unneeded/inoperant actions
+    //
+    ui_disable_action("savefile");
+    ui_disable_action("closefile");
+    ui_disable_action("editmode");
+    ui_disable_action("runmode");
+    ui_disable_action("presentmode");
+    ui_disable_action("togglesidebar");
+}
+
+void ui_send_notification(const char *message)
+{
+    g_print("NOTIFICATION: %s\n", message);
+
+    g_application_send_notification(G_APPLICATION(application),
+                                        "notification",
+                                        g_notification_new(message)
+                                    );
+}
+
+/* -------------------------------------------------------------------------- */
+
+static void gem_graph_client_application_class_init(
+                                        GemGraphClientApplicationClass *klass)
+{
+    GApplicationClass *app_class = G_APPLICATION_CLASS(klass);
+
+    app_class->activate = gem_graph_client_application_activate;
+}
+
+GemGraphClientApplication *gem_graph_client_application_new(
+                                                    const char *application_id,
+                                                    GApplicationFlags flags)
+{
+    g_return_val_if_fail(application_id != NULL, NULL);
+
+    return g_object_new(GEM_GRAPH_CLIENT_TYPE_APPLICATION,
+                       "application-id", application_id,
+                       "flags", flags,
+                       NULL);
+}

src/ui/bac_a_sable.ui

@@ -0,0 +1,37 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.14.0 -->
+<interface>
+  <!-- interface-name gem-graph.ui -->
+  <requires lib="gtk" version="4.6"/>
+  <template class="GemGraphClientWindow" parent="GtkApplicationWindow">
+    <property name="icon-name">application-x-executable</property>
+    <property name="title">WIP</property>
+    <child>
+      <object class="GtkBox">
+        <child>
+          <object class="GtkBox">
+            <child>
+              <object class="GtkGLArea" id="run_glarea"/>
+            </child>
+          </object>
+        </child>
+        <child>
+          <object class="GtkBox" id="run_controls">
+            <property name="margin-bottom">50</property>
+            <property name="margin-top">50</property>
+            <property name="orientation">horizontal</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkBox" id="glarea_controls"/>
+        </child>
+      </object>
+    </child>
+    <child type="titlebar">
+      <object class="GtkHeaderBar" id="main_titlebar"/>
+    </child>
+    <style>
+      <class name="devel"/>
+    </style>
+  </template>
+</interface>

src/ui/events.c

@@ -0,0 +1,354 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: User interface functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include "../../include/base.h"
+#include "../../include/graphics.h"
+#include "../../include/ui.h"
+
+
+
+void on_about_action(GSimpleAction *action,
+                     GVariant *parameter,
+                     gpointer user_data)
+{
+    static const char *authors[] = {    "Adrien Bourmault (neox@a-lec.org)",
+                                        "Jean Sirmai (jean@a-lec.org)",
+                                        "Arthur Menges (arthur.menges@a-lec.org)",
+                                        NULL};
+    GemGraphClientApplication *self = user_data;
+    GtkWindow *window = NULL;
+
+    g_assert (GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    window = gtk_application_get_active_window(GTK_APPLICATION (self));
+
+    gtk_show_about_dialog(window,
+                         "program-name", "Gem-graph",
+                         "logo-icon-name", "application-x-executable",
+                         "authors", authors,
+                         "version", "0.1.0",
+                         "copyright", "Copyright © 2023 Libre en Communs",
+                         NULL);
+}
+
+void on_quit_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    g_application_quit(G_APPLICATION(self));
+}
+
+void on_preferences_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_send_internal_notification("Not implemented !");
+}
+
+void on_togglesidebar_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_toggle_sidebar();
+}
+
+void on_editmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_set_stack(EDIT_MODE);
+}
+
+void on_runmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_set_stack(RUN_MODE);
+}
+
+void on_presentmode_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_set_stack(PRESENTATION_MODE);
+}
+
+void on_openfile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    // Create a new file selection dialog, using the "open" mode
+    GtkFileChooserNative *native =
+    gtk_file_chooser_native_new("Open File",
+                                GTK_WINDOW(self),
+                                GTK_FILE_CHOOSER_ACTION_OPEN,
+                                "_Open",
+                                "_Cancel");
+
+    // Connect the "response" signal of the file selection dialog;
+    // this signal is emitted when the user selects a file, or when
+    // they cancel the operation
+    g_signal_connect (native,
+                    "response",
+                    G_CALLBACK(on_openfile_response),
+                    self);
+
+    // Present the dialog to the user
+    gtk_native_dialog_show (GTK_NATIVE_DIALOG (native));
+}
+
+void on_closefile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_disable_action("closefile");
+    ui_disable_action("savefile");
+    ui_disable_action("runmode");
+    ui_disable_action("editmode");
+    ui_disable_action("presentmode");
+    ui_disable_action("togglesidebar");
+    ui_set_stack(HOME_MODE);
+}
+
+void on_savefile_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+}
+
+void on_toast_close_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data)
+{
+    GemGraphClientApplication *self = user_data;
+
+    g_assert(GEM_GRAPH_CLIENT_IS_APPLICATION(self));
+
+    ui_close_internal_notification();
+}
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Graphical/view related events
+ */
+
+void on_axis_value_change(GtkAdjustment *adjustment, gpointer data)
+{
+
+    GtkWidget *slider = gtk_widget_get_parent(GTK_WIDGET(data));
+    GtkWidget *container_widget = gtk_widget_get_parent(GTK_WIDGET(slider));
+
+    const gchar *label_text = gtk_label_get_label(GTK_LABEL(data));
+
+    // THANKS ASCIIIII/Unicode/Whateverrr !
+    int axis = label_text[0] - 'X';
+
+    g_assert(axis >= 0 && axis < N_AXIS);
+
+    /* Update the rotation angle */
+    ui_update_axis_stack(container_widget,
+                         axis,
+                         gtk_adjustment_get_value(adjustment));
+
+    /* Update the contents of the GL drawing area */
+}
+
+gboolean on_glarea_render(GtkGLArea *area, GdkGLContext *context)
+{
+    // Check if the widget is a glarea
+    if(gtk_gl_area_get_error(area) != NULL) {
+        ui_send_internal_notification("An OpenGL error occured !");
+        return false;
+    }
+
+    if (ui_render_stack(gtk_widget_get_parent(GTK_WIDGET(area))) == false) {
+        ui_send_internal_notification(
+            "Failed to render corresponding graphic stack !");
+        return false;
+    }
+
+    return true;
+}
+
+
+/* We need to set up our state when we realize the GtkGLArea widget */
+void on_glarea_realize(GtkWidget *widget)
+{
+    GError *internal_error = NULL;
+
+    // Make the GL context current to be able to call the GL API
+    gtk_gl_area_make_current(GTK_GL_AREA(widget));
+
+    // Check if the widget is a glarea
+    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL) {
+        ui_send_internal_notification("An OpenGL error occured !");
+        return;
+    }
+
+    // Link graphical stack to widget
+    if (ui_init_graphic_stack(gtk_widget_get_parent(widget),
+                              internal_error) == false) {
+        ui_send_internal_notification(
+            "Failed to link the graphic stack to widgets !");
+        return;
+    }
+
+    gtk_gl_area_set_auto_render(GTK_GL_AREA(widget), true);
+}
+
+/* We should tear down the state when unrealizing */
+void on_glarea_unrealize(GtkWidget *widget)
+{
+    GError *internal_error = NULL;
+
+    // Make the GL context current to be able to call the GL API
+    gtk_gl_area_make_current(GTK_GL_AREA(widget));
+
+    // Check if the widget is a glarea
+    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL) {
+        ui_send_internal_notification("An OpenGL error occured !");
+        return;
+    }
+
+    // Destroy graphic stack
+    if (ui_shutdown_graphic_stack(gtk_widget_get_parent(widget),
+                                  internal_error) == false) {
+        ui_send_internal_notification(
+            "Failed to shutdown the graphic stack !");
+        return;
+    }
+}
+
+void on_close_window(GtkWidget *widget)
+{
+
+    ui_shutdown_all_graphic_stacks();
+    ui_clean_stack_index();
+}
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Responses
+ */
+void on_openfile_response(GtkNativeDialog *native,
+                          int response,
+                          GemGraphClientWindow *self)
+{
+    g_autoptr(GFile) file;
+    GtkFileChooser *chooser;
+
+    if (response == GTK_RESPONSE_ACCEPT) {
+        chooser = GTK_FILE_CHOOSER(native);
+        file = gtk_file_chooser_get_file(chooser);
+
+        // Load asynchroneously not to block control flow
+        g_file_load_contents_async (file,
+                              NULL,
+                              (GAsyncReadyCallback)on_openfile_response_complete,
+                              self);
+    }
+
+    g_object_unref(native);
+}
+
+void on_openfile_response_complete(GObject *source_object,
+                                   GAsyncResult *result,
+                                   GemGraphClientWindow *self)
+{
+    GFile *file = G_FILE(source_object);
+
+    g_autofree char *contents = NULL;
+    gsize length = 0;
+
+    g_autoptr(GError) error = NULL;
+
+    // Gives you the contents of the file as a byte array, or
+    // set the error argument
+    g_file_load_contents_finish(file,
+                               result,
+                               &contents,
+                               &length,
+                               NULL,
+                               &error);
+
+    // In case of error, print a warning to the standard error output
+    if (error != NULL)
+    {
+      g_printerr("Unable to open “%s”: %s\n",
+                 g_file_peek_path(file),
+                 error->message);
+      return;
+    }
+
+    //g_print("File content is :\n%s\n", contents);
+
+    ui_enable_action("closefile");
+    ui_enable_action("savefile");
+    ui_enable_action("runmode");
+    ui_enable_action("editmode");
+    ui_enable_action("presentmode");
+    ui_enable_action("togglesidebar");
+    ui_set_stack(RUN_MODE);
+}
+

src/ui/gemgraph.ui

@@ -0,0 +1,312 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.10.2 -->
+<interface>
+  <!-- interface-name gem-graph.ui -->
+  <requires lib="gtk" version="4.6"/>
+  <template class="GemGraphClientWindow" parent="GtkApplicationWindow">
+    <property name="default-height">900</property>
+    <property name="default-width">1400</property>
+    <property name="icon-name">application-x-executable</property>
+    <property name="title">GemGraph 0.1.0</property>
+    <style>
+      <class name="devel"/>
+    </style>
+    <child type="titlebar">
+      <object class="GtkHeaderBar" id="main_titlebar">
+        <child type="end">
+          <object class="GtkMenuButton" id="main_button_menu">
+            <property name="direction">none</property>
+            <property name="menu-model">main_menu</property>
+          </object>
+        </child>
+        <child type="start">
+          <object class="GtkMenuButton" id="main_button_mode">
+            <property name="always-show-arrow">True</property>
+            <property name="use-underline">True</property>
+            <property name="tooltip-text" translatable="yes">Change session mode</property>
+            <property name="icon-name">document-edit-symbolic</property>
+            <property name="menu-model">mode_menu</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkToggleButton" id="main_button_sidebar">
+            <property name="icon-name">sidebar-show-symbolic</property>
+            <property name="tooltip-text" translatable="yes">Display/hide sidebar</property>
+            <property name="action-name">app.togglesidebar</property>
+          </object>
+        </child>
+      </object>
+    </child>
+    <child>
+      <object class="GtkOverlay" id="toast_overlay">
+        <child>
+          <object class="GtkPaned" id="main_paned">
+            <property name="position">300</property>
+            <child>
+              <object class="GtkStack" id="side_stack">
+                <child>
+                  <object class="GtkStackPage">
+		                <property name="name">run</property>
+                    <property name="child">
+                      <object class="GtkBox">
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkBox" id="control_zone">
+                            <property name="orientation">vertical</property>
+                          </object>
+                        </child>
+                        <child>
+                          <object class="GtkStackSwitcher">
+                            <property name="visible">True</property>
+                            <property name="stack">runlib_stack</property>
+                          </object>
+                        </child>
+                        <child>
+                          <object class="GtkStack" id="runlib_stack">
+                            <child>
+                              <object class="GtkStackPage">
+                                <property name="name">runlib_objects</property>
+                                <property name="title" translatable="yes">Objects</property>
+                                <property name="visible">True</property>
+                                <property name="child">
+                                  <object class="GtkLabel" id="label_runlib_objects">
+                                    <property name="justify">center</property>
+                                    <property name="label" translatable="yes">&lt;b&gt;runlib_objects&lt;/b&gt;</property>
+                                    <property name="use-markup">True</property>
+                                    <property name="margin-top">50</property>
+                                    <property name="margin-bottom">50</property>
+                                  </object>
+                                </property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkStackPage">
+                                <property name="name">runlib_conditions_and_rules</property>
+                                <property name="title" translatable="yes">Rules &amp; Conds</property>
+                                <property name="visible">True</property>
+                                <property name="child">
+                                  <object class="GtkLabel" id="label_runlib_conditions_and_rules">
+                                    <property name="justify">center</property>
+                                    <property name="label" translatable="yes">&lt;b&gt;runlib_conditions_and_rules&lt;/b&gt;</property>
+                                    <property name="use-markup">True</property>
+                                    <property name="margin-top">50</property>
+                                    <property name="margin-bottom">50</property>
+                                  </object>
+                                </property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkStackPage">
+                                <property name="name">runlib_states</property>
+                                <property name="title" translatable="yes">Savedstates</property>
+                                <property name="visible">True</property>
+                                <property name="child">
+                                  <object class="GtkLabel" id="label_runlib_states">
+                                    <property name="justify">center</property>
+                                    <property name="label" translatable="yes">&lt;b&gt;runlib_states&lt;/b&gt;</property>
+                                    <property name="use-markup">True</property>
+                                    <property name="margin-top">50</property>
+                                    <property name="margin-bottom">50</property>
+                                  </object>
+                                </property>
+                              </object>
+                            </child>
+                          </object>
+                        </child>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+		            <child>
+                  <object class="GtkStackPage">
+		                <property name="name">home</property>
+                    <property name="child">
+                      <object class="GtkLabel" id="labelhome">
+                        <property name="justify">center</property>
+                        <property name="label" translatable="yes">&lt;b&gt;Sidebar: home&lt;/b&gt;</property>
+                        <property name="use-markup">True</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkStackPage">
+		                <property name="name">presentation</property>
+                    <property name="child">
+                      <object class="GtkLabel" id="labelsidepresentation">
+                        <property name="justify">center</property>
+                        <property name="label" translatable="yes">&lt;b&gt;Sidebar: presentation mode&lt;/b&gt;</property>
+                        <property name="use-markup">True</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkStackPage">
+                    <property name="name">edition</property>
+                    <property name="child">
+                      <object class="GtkLabel" id="labelsideedit">
+                        <property name="justify">center</property>
+                        <property name="label" translatable="yes">&lt;b&gt;Sidebar: edition mode&lt;/b&gt;</property>
+                        <property name="use-markup">True</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+              </object>
+            </child>
+            <child>
+              <object class="GtkStack" id="main_stack">
+                <child>
+                  <object class="GtkStackPage">
+                    <property name="name">run</property>
+                    <property name="child">
+                       <object class="GtkBox" id="run_glarea_box">
+                         <property name="orientation">vertical</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+		            <child>
+                  <object class="GtkStackPage">
+		                <property name="name">home</property>
+                    <property name="child">
+                        <object class="GtkBox">
+                          <property name="orientation">vertical</property>
+                          <child>
+                            <object class="GtkImage">
+                              <property name="vexpand">True</property>
+                              <property name="file">data/hicolor/apps/scalable/gemgraph_désaturé.png</property>
+                            </object>
+                          </child>
+                          <child>
+                            <object class="GtkLabel">
+                              <property name="margin-bottom">50</property>
+                              <property name="margin-top">00</property>
+                              <property name="justify">center</property>
+                              <property name="valign">center</property>
+                              <property name="label" translatable="yes">&lt;b&gt;Welcome to the Gem-graph client.&lt;/b&gt;</property>
+                              <property name="use-markup">True</property>
+                            </object>
+                          </child>
+                        </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkStackPage">
+                    <property name="name">presentation</property>
+                    <property name="child">
+                      <object class="GtkBox" id="presentation_glarea_box">
+                        <property name="orientation">vertical</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkStackPage">
+                    <property name="name">edition</property>
+                    <property name="child">
+                      <object class="GtkBox" id="edition_glarea_box">
+                        <property name="orientation">vertical</property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+        <child type="overlay">
+          <object class="GtkRevealer" id="toast_revealer">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="halign">center</property>
+            <property name="valign">start</property>
+            <property name="transition-type">GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN</property>
+            <child>
+              <object class="GtkBox" id="toast_box">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="valign">start</property>
+                <property name="spacing">20</property>
+                <child>
+                  <object class="GtkLabel" id="toast_text">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label" translatable="yes">(null)</property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkToggleButton" id="toast_close_button">
+                    <property name="icon-name">window-close-symbolic</property>
+                    <property name="action-name">app.toastclose</property>
+                  </object>
+                </child>
+                <style>
+                  <class name="app-notification"/>
+                </style>
+              </object>
+            </child>
+          </object>
+        </child>
+    </object>
+    </child>
+  </template>
+
+  <menu id="main_menu">
+    <section>
+      <item>
+        <attribute name="label" translatable="yes">_Open...</attribute>
+        <attribute name="action">app.openfile</attribute>
+      </item>
+      <item>
+        <attribute name="label" translatable="yes">_Close</attribute>
+        <attribute name="action">app.closefile</attribute>
+      </item>
+      <item>
+        <attribute name="label" translatable="yes">_Save</attribute>
+        <attribute name="action">app.savefile</attribute>
+      </item>
+    </section>
+    <section>
+      <item>
+        <attribute name="label" translatable="yes">_Preferences</attribute>
+        <attribute name="action">app.preferences</attribute>
+      </item>
+      <item>
+        <attribute name="label" translatable="yes">_Keyboard Shortcuts</attribute>
+        <attribute name="action">win.show-help-overlay</attribute>
+      </item>
+      <item>
+        <attribute name="label" translatable="yes">_About GemGraph</attribute>
+        <attribute name="action">app.about</attribute>
+      </item>
+    </section>
+  </menu>
+  <menu id="mode_menu">
+    <section>
+
+      <attribute name="label" translatable="yes">Switch session mode</attribute>
+
+      <item>
+        <attribute name="icon">document-edit-symbolic</attribute>
+        <attribute name="label" translatable="yes">_Edition</attribute>
+        <attribute name="action">app.editmode</attribute>
+        <attribute name="use-icon">True</attribute>
+      </item>
+      <item>
+        <attribute name="icon">system-run-symbolic</attribute>
+        <attribute name="label" translatable="yes">_Run</attribute>
+        <attribute name="action">app.runmode</attribute>
+        <attribute name="use-icon">True</attribute>
+      </item>
+      <item>
+        <attribute name="icon">video-display-symbolic</attribute>
+        <attribute name="label" translatable="yes">_Presentation</attribute>
+        <attribute name="action">app.presentmode</attribute>
+        <attribute name="use-icon">True</attribute>
+      </item>
+    </section>
+  </menu>
+</interface>

src/ui/graphics.c

@@ -0,0 +1,323 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: User interface functions
+ *
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <gtk-4.0/gtk/gtk.h>
+#include <glib-2.0/glib.h>
+
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+
+struct stack_index_t {
+    long stack_id;
+    void *container_widget;
+    void *gl_area;
+};
+
+static struct stack_index_t *stack_index = NULL;
+size_t stack_index_size = 0;
+
+
+/*
+ *  Look for stack entry and returns stack_id
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns stack_id
+ */
+long ui_get_graphic_stack(void *container_widget)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            return stack_index[i].stack_id;
+        }
+    }
+    return -1;
+}
+
+/*
+ *  Look for stack entry and returns stack_id
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns stack_id
+ */
+long ui_is_graphic_stack_ready(void *container_widget)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            return stack_index[i].stack_id;
+        }
+    }
+    return -1;
+}
+
+/*
+ *  Look for stack entry and initializes OpenGL for it
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_init_graphic_stack(void *container_widget, GError *error_buffer)
+{
+    g_printerr("[debug] ui_init_graphic_stack()\n");
+
+    g_printerr("[debug] ui_init_graphic_stack() : target is %p\n", container_widget);
+
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        g_printerr("[debug]     ui_init_graphic_stack() : i is %d\n", i);
+        g_printerr("[debug]     ui_init_graphic_stack() : target would be %p\n",
+                   stack_index[i].container_widget);
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            stack_index[i].stack_id = graphics_init(&error_buffer);
+            g_printerr("[debug] ui_init_graphic_stack() : stack_id is %d\n",
+                       stack_index[i].stack_id);
+            if (stack_index[i].stack_id >= 0)
+                return true;
+            else
+                return false;
+        }
+    }
+    return false;
+}
+
+/*
+ *  Look for stack entry and shutdowns OpenGL for it
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_shutdown_graphic_stack(void *container_widget, GError *error_buffer)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            if (graphics_shutdown(stack_index[i].stack_id,
+                                  &error_buffer) == false) {
+                return false;
+            }
+            stack_index[i].stack_id = 0;
+            return true;
+        }
+    }
+    return false;
+}
+
+
+void ui_clean_stack_index(void)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        stack_index[i].stack_id = 0;
+    }
+    return;
+}
+
+/*
+ *  Look for stack entry and triggers OpenGL for drawing
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_render_stack(GtkWidget *container_widget)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            graphics_draw(stack_index[i].stack_id);
+            return true;
+        }
+    }
+    return false;
+}
+
+/*
+ *  Look for stack entry and triggers OpenGL for drawing
+ *
+ *  @params container_widget, generally the GtkBox that contains the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_update_axis_stack(GtkWidget *container_widget, int axis, int value)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        if (stack_index[i].container_widget == (void *)container_widget) {
+            graphic_stack[stack_index[i].stack_id].rotation_angles[axis] = value;
+            gtk_widget_queue_draw((GtkWidget*)(stack_index[i].gl_area));
+            return true;
+        }
+    }
+    return false;
+}
+
+/*
+ *  Look for every stack entry and shutdowns OpenGL for it
+ *
+ *  @params void
+ *
+ *  @returns bool, true if success
+ */
+void ui_shutdown_all_graphic_stacks(void)
+{
+    // look for stack_index entry
+    for (int i = 0; i < stack_index_size; i++) {
+        graphics_shutdown(stack_index[i].stack_id, NULL);
+    }
+    return;
+}
+
+/*
+ *  Creates a slider widget
+ *
+ *  @params axis, meaning which axis we're building (for label)
+ *
+ *  @returns GtkWidget*, pointer to the new widget
+ */
+GtkWidget *create_axis_slider(int axis)
+{
+    GtkWidget *box, *label, *slider;
+    GtkAdjustment *adj;
+    const char *text;
+
+    box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
+
+    switch (axis) {
+    case X_AXIS:
+        text = "X";
+        break;
+
+    case Y_AXIS:
+        text = "Y";
+        break;
+
+    case Z_AXIS:
+        text = "Z";
+        break;
+
+    default:
+        g_assert_not_reached();
+    }
+
+    label = gtk_label_new(text);
+    gtk_box_append(GTK_BOX(box), label);
+    gtk_widget_show(label);
+
+    adj = gtk_adjustment_new(0.0, 0.0, 360.0, 1.0, 12.0, 0.0);
+    g_signal_connect(adj, "value-changed",
+                                        G_CALLBACK(on_axis_value_change),
+                                        (gpointer) label);
+    slider = gtk_scale_new(GTK_ORIENTATION_HORIZONTAL, adj);
+    gtk_box_append(GTK_BOX(box), slider);
+    gtk_widget_set_hexpand(slider, TRUE);
+    gtk_widget_show(slider);
+
+    gtk_widget_show(box);
+
+    return box;
+}
+
+/*
+ *  Creates GLArea and indexes it
+ *
+ *  @params target_mode, meaning which ui_stack we're on
+ *          target_widget, meaning the box that will host the GLArea
+ *
+ *  @returns bool, true if success
+ */
+bool ui_setup_glarea(int target_mode, GtkWidget *target_widget)
+{
+    GtkWidget *gl_area;
+
+    //g_printerr("[debug] ui_setup_glarea()\n");
+
+    assert(target_widget);
+
+    //g_printerr("[debug] ui_setup_glarea() : target is %p\n", target_widget);
+
+    if (stack_index == NULL) {
+        stack_index = g_malloc(sizeof(struct stack_index_t));
+        stack_index_size = 1;
+    } else {
+        // look for stack_index entry
+        for (int i = 0; i < stack_index_size; i++) {
+            if (stack_index[i].container_widget == (void *)target_widget) {
+                return false;
+            }
+        }
+        // create entry
+        stack_index =
+            g_realloc(stack_index,
+                      ++stack_index_size * sizeof(struct stack_index_t));
+    }
+
+    gl_area = GTK_WIDGET(gtk_gl_area_new());
+    assert(gl_area);
+
+    gtk_widget_set_hexpand(gl_area, TRUE);
+    gtk_widget_set_vexpand(gl_area, TRUE);
+    gtk_widget_set_halign(gl_area, GTK_ALIGN_CENTER);
+    gtk_widget_set_valign(gl_area, GTK_ALIGN_CENTER);
+    gtk_widget_set_size_request(gl_area, 500, 500);
+    gtk_gl_area_set_auto_render(GTK_GL_AREA(gl_area), true);
+
+    // The main "draw" call for GtkGLArea
+    g_signal_connect(GTK_GL_AREA(gl_area),
+                     "render",
+                     G_CALLBACK(on_glarea_render), NULL);
+
+    g_signal_connect(gl_area,
+                     "realize",
+                     G_CALLBACK(on_glarea_realize), NULL);
+
+    g_signal_connect(gl_area,
+                     "unrealize",
+                     G_CALLBACK(on_glarea_unrealize), NULL);
+
+    stack_index[stack_index_size-1].container_widget =
+        (void*)target_widget;
+
+    stack_index[stack_index_size-1].gl_area = (void*)gl_area;
+
+    //g_printerr("[debug] ui_setup_glarea() : set target to %p\n", target_widget);
+
+    //g_printerr("[debug] ui_setup_glarea() : stack_index (@0x%p) had %ld elements\n",
+               //stack_index,
+               //stack_index_size);
+
+    gtk_box_append(GTK_BOX(target_widget), gl_area);
+    gtk_widget_show(GTK_WIDGET(gl_area));
+
+    // Create sliders
+    for(int i = 0; i < N_AXIS; i++)
+        gtk_box_append(GTK_BOX(target_widget), create_axis_slider(i));
+
+    return true;
+}

src/ui/window.c

@@ -0,0 +1,236 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: User interface functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <gtk-4.0/gtk/gtk.h>
+#include <glib-2.0/glib.h>
+
+#include "../../include/base.h"
+#include "../../include/ui.h"
+
+/* -------------------------------------------------------------------------- */
+
+static GemGraphClientWindow *window;
+
+/* -------------------------------------------------------------------------- */
+
+struct _GemGraphClientWindow
+{
+    GtkApplicationWindow  parent_instance;
+
+    /* Template widgets */
+    GtkHeaderBar *main_titlebar;
+    GtkStack *main_stack;
+    GtkStack *side_stack;
+    GtkPaned *main_paned;
+    GtkMenuButton *main_button_mode;
+    GtkToggleButton *main_button_sidebar;
+    GtkRevealer *toast_revealer;
+    GtkToggleButton *toast_close_button;
+    GtkLabel *toast_text;
+    GtkBox *control_zone;
+    GtkBox *run_glarea_box;
+    GtkBox *edition_glarea_box;
+    GtkBox *presentation_glarea_box;
+};
+
+G_DEFINE_FINAL_TYPE (GemGraphClientWindow,
+                     gem_graph_client_window,
+                     GTK_TYPE_APPLICATION_WINDOW)
+
+static void gem_graph_client_window_class_init(GemGraphClientWindowClass *klass)
+{
+    gchar *contents;
+    gsize len;
+    GError *err;
+    GBytes *bytes;
+
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+
+    if (g_file_get_contents("src/ui/gemgraph.ui", &contents, &len, &err) == FALSE)
+        g_error("error reading gemgraph.ui: %s", err->message);
+
+    bytes = g_bytes_new_take(contents, len);
+    gtk_widget_class_set_template(GTK_WIDGET_CLASS(klass), bytes);
+
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       main_titlebar);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       main_stack);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       side_stack);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       main_paned);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       main_button_mode);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       main_button_sidebar);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       toast_revealer);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       toast_close_button);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       toast_text);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       control_zone);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       run_glarea_box);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       edition_glarea_box);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       presentation_glarea_box);
+}
+
+static void gem_graph_client_window_init(GemGraphClientWindow *self)
+{
+    gtk_widget_init_template(GTK_WIDGET(self));
+    window = self;
+
+    // Launch with sidebar off
+    ui_toggle_sidebar();
+}
+
+/* -------------------------------------------------------------------------- */
+
+void ui_set_stack(int mode)
+{
+    //g_printerr("[debug] ui_set_stack()\n");
+
+    if (window->main_stack == NULL) {
+        g_printerr("Can't find self->main_stack !\n");
+        return;
+    }
+    if (window->side_stack == NULL) {
+        g_printerr("Can't find self->side_stack !\n");
+        return;
+    }
+
+    // Switch on the first letter of the mode, because switch is soooo simple :)
+    switch(mode) {
+        case EDIT_MODE:
+            gtk_stack_set_visible_child_full(window->main_stack,
+                                     "edition",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_stack_set_visible_child_full(window->side_stack,
+                                     "edition",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "document-edit-symbolic");
+            ui_setup_glarea(EDIT_MODE, GTK_WIDGET(window->edition_glarea_box));
+            break;
+        case RUN_MODE:
+            gtk_stack_set_visible_child_full(window->main_stack,
+                                     "run",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_stack_set_visible_child_full(window->side_stack,
+                                     "run",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "system-run-symbolic");
+            ui_setup_glarea(RUN_MODE, GTK_WIDGET(window->run_glarea_box));
+            break;
+        case PRESENTATION_MODE:
+            gtk_stack_set_visible_child_full(window->main_stack,
+                                     "presentation",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_stack_set_visible_child_full(window->side_stack,
+                                     "presentation",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "x-office-presentation-symbolic");
+            ui_setup_glarea(PRESENTATION_MODE,
+                            GTK_WIDGET(window->presentation_glarea_box));
+            break;
+        case HOME_MODE:
+            gtk_stack_set_visible_child_full(window->main_stack,
+                                     "home",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_stack_set_visible_child_full(window->side_stack,
+                                     "home",
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+            gtk_paned_set_position(window->main_paned, 0);
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "user-home-symbolic");
+            break;
+        default:
+            break;
+    }
+}
+
+void ui_send_internal_notification(const char *message)
+{
+    if (window->toast_revealer == NULL) {
+        g_printerr("Can't find self->toast_overlay !\n");
+        return;
+    }
+
+    if (window->toast_text == NULL) {
+        g_printerr("Can't find self->toast_overlay !\n");
+        return;
+    }
+
+    gtk_label_set_label(window->toast_text, message);
+    gtk_revealer_set_reveal_child(window->toast_revealer, true);
+    g_printerr("%s\n", message);
+}
+
+void ui_close_internal_notification(void)
+{
+    if (window->toast_revealer == NULL) {
+        g_printerr("Can't find self->toast_overlay !\n");
+        return;
+    }
+
+    if (window->toast_text == NULL) {
+        g_printerr("Can't find self->toast_overlay !\n");
+        return;
+    }
+
+    gtk_revealer_set_reveal_child(window->toast_revealer, false);
+}
+
+
+void ui_toggle_sidebar(void)
+{
+    int position = gtk_paned_get_position(window->main_paned);
+
+    if (position != 0) {
+        gtk_paned_set_position(window->main_paned, 0);
+    } else {
+        gtk_paned_set_position(window->main_paned, 400);
+    }
+}