WIP: Un algorithme qui calcule l'adresse mémoire d'un point (i,j,k) de l'espace. OK

This reverts commit fffaaa8df0.

.gitignore

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+**/tags.*
+bin/*
+build/*

LICENSE

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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 +1,137 @@
+##
+##      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
+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"
+
+
+ifeq ($(ID), guix)
+build_system:
+	@echo -e ${CL2}[$@] ${CL}building through containerized manifest...${CL3}
+	@guix shell --container -m ./manifest.scm -- make $(BINDIR)/gem-graph-client -j $(NTHREADS)
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+else
+build_system:
+	@echo -e ${CL2}[$@] ${CL}building...${CL3}
+	@make $(BINDIR)/gem-graph-client -j $(NTHREADS)
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+endif
+
+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 ?
+
+

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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)

include/base.h

@@ -0,0 +1,75 @@
+/*
+ *      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 <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <glib.h>
+#define G_APPLICATION_DEFAULT_FLAGS 0
+
+enum
+{
+    X_AXIS,
+    Y_AXIS,
+    Z_AXIS,
+
+    N_AXIS
+};
+
+/*
+ * 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));
+
+    lseek(fd, 0, SEEK_SET);
+    read(fd,contents,filesize);
+
+    contents[filesize-1] = '\0';
+
+    close(fd);
+
+    return contents;
+}

include/buffers.h

@@ -0,0 +1,41 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  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 <unistd.h>
+#include <stdbool.h>
+#include <GL/glu.h>
+
+bool compute_space(int space_X, int space_Y, int space_Z,
+                   GLuint *arrows, int model_arrows_nb,
+                   int pref_show_grid, int pref_central_stars_nb,
+                   int pref_test_diagonal,
+                   int buffer_vertex_size_after_grids,
+                   int buffer_vertex_size_after_stars,
+                   GLfloat *vertex_origin, GLfloat *colors_origin,
+                   GLuint *lines_origin, GLuint *plans_origin);
+
+bool draw_some_arrows (GLuint *lines_origin,
+                       int s, int stx, int sty,
+                       GLuint *arrows, int arrows_nb);
+

include/graphics.h

@@ -0,0 +1,95 @@
+/*
+ *      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 <unistd.h>
+#include <stdbool.h>
+#include <GL/glu.h>
+
+/*
+ * Structure describing a gl_area and its parameters, used to create a table
+ * of Gem-graph client current gl_areas
+ */
+struct gl_area_entry {
+    char name[16];
+    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
+//  GLuint line_indices_nb; //  now : graphics.c  >  int buffer_lines_ndx
+//  GLuint plan_indices_nb; //  now : graphics.c  >  int buffer_plans_ndx
+
+};
+
+/*
+ * Initializes a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if initialized
+ */
+bool graphics_init(const char *gl_area);
+
+/*
+ * Draws the current buffer to a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  void
+ */
+void graphics_draw(const void *gl_area);
+
+/*
+ * Shutdowns a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if success
+ */
+bool graphics_shutdown(const void *gl_area);
+
+/*
+ * 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 void *gl_area);
+
+/*
+ * Initializes the buffer of a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * Note : indices[] is defined in graphics_cube.h
+ *
+ * @return  void
+ */
+void graphics_init_buffers(const void *gl_area);

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 +1,165 @@
+/*
+ *      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"
+
+extern float rotation_angles[N_AXIS];
+
+extern GtkWidget *gl_area;
+
+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_render(GtkGLArea * area, GdkGLContext * context);
+
+void on_realize(GtkWidget *widget);
+
+void on_unrealize(GtkWidget *widget);
+
+void on_close_window(GtkWidget *widget);
+
+/* -------------------------------------------------------------------------- */
+
+//
+// Window primitives
+//
+
+void ui_set_stack(const char *mode);
+
+void ui_setup_glarea(GtkGLArea *target, GtkBox *target_controls);
+void ui_send_internal_notification(const char *message);
+void ui_close_internal_notification(void);
+void ui_toggle_sidebar();
+

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"
+   )
+)

resolu

@@ -0,0 +1,59 @@
+delta = 2 + 3 + 61 + 83 + 87 + 67 + 23
+  - 45 - 137 - 253 - 393 - 557 - 745 
+  - 957 - 1193 - 1453 - 1737 - 2045 
+  - 2377 - 2733 - 3113 - 3517 ---
+
+------------------------------------------
+côté             dérivée_1      dérivée_2
+ c    (1)          (d1)              (d2)
+------------------------------------------
+ 1     -4 -   72 = -76    -76 --100 = 24
+ 3    -56 -   -4 = -52    -52 - -76 = 24
+ 5    -84 -  -56 = -28    -28 - -52 = 24
+ 7    -88 -  -84 =  -4     -4 - -28 = 24	    
+ 9    -68 -  -88 =  20     20 -  -4 = 24
+ 11   -23 -  -68 =  44     44 -  20 = 24
+ 13    45 -  -23 =  68     68 -  44 = 24
+ 15   137 -   45 =  92     92 -  68 = 24 
+ 17   253 -  137 = 116    116 -  92 = 24
+ 19   393 -  253 = 140    140 - 116 = 24 
+ 21   557 -  393 = 164    164 - 140 = 24
+ 23   745 -  557 = 188    188 - 164 = 24
+ 25   957 -  745 = 212    212 - 188 = 24
+ 27  1193 -  957 = 236    236 - 212 = 24
+ 29  1453 - 1193 = 260    260 - 236 = 24
+ 31  1737 - 1453 = 284    284 - 260 = 24
+ 33  2045 - 1737 = 308    308 - 284 = 24
+ 35  2377 - 2045 = 332    332 - 308 = 24
+ 37  2733 - 2377 = 356    356 - 332 = 24
+ 39  3113 - 2733 = 380    380 - 356 = 24
+ 41  3517 - 3113 = 404    404 - 380 = 24
+
+Pour calculer l'adresse mémoire des trois lignes 
+qui dessinnent l'étoile située au centre d'un cube
+de côté 'c' il faut faire la somme des quatre termes :
+- coeff_1 = step_z * space_Z + step_y * space_Y + step_x * space_X
+- coeff_2 = (i * step_x + j * step_y + k * step_z) * 6
+- center  = space_X * space_Y * space_Z / 2      et
+- delta   = sigma (de 1 à c) des termes de la colonne 1
+
+draw_a_central_star (lines_origin, coeff_1 + center + coeff_2 + delta)
+
+static void draw_a_central_star(GLuint *lines_origin, int n)
+{
+    draw_line (lines_origin, n + 0, n + 1);
+    draw_line (lines_origin, n + 2, n + 3);
+    draw_line (lines_origin, n + 4, n + 5);
+}
+
+static void draw_line (GLuint *lines_origin, int a, int b)
+{
+    *(lines_origin + lines_index) = a; lines_index ++;
+    *(lines_origin + lines_index) = b; lines_index ++;
+}
+
+On calcule le dernier terme de 'delta' en connaissant 
+sa différence avec le terme précédent de la colonne (1).
+
+On calcule cette différence (d1) en ajoutant 24 
+au terme précédent de la colonne (d1).

src/graphics/buffers.c

@@ -0,0 +1,665 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  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
+ *  aint with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+//#pragma once
+#include <unistd.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <epoxy/gl.h>
+#include <GL/glu.h>
+#include <GL/glext.h>
+#include <glib-2.0/glib.h>
+#include <math.h>
+#include <errno.h>
+
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+#include "../../include/buffers.h"
+
+static int vertex_index = 0;
+static int colors_index = 0;
+static int lines_index = 0;
+//static int plans_index = 0;
+
+
+
+static bool grids_intersections_volume (int x, int y, int z,
+                                 GLfloat *vertex_origin, GLfloat *colors_origin)
+{
+
+    float i, j, k, vx, vy, vz, max = fmax(x, y);
+                               max = fmax(max, z);
+
+    for (i = 0; i <= x; i++)
+        for (j = 0; j <= y; j++)
+            for (k = 0; k <= z; k++){
+
+                vx = (2 * i / x - 1) * x / max;
+                vy = (2 * j / y - 1) * y / max;
+                vz = (2 * k / z - 1) * z / max;
+
+                *(vertex_origin + vertex_index + 0) = vx;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                if ((i == 0 || i == x) && (j == 0 || j == y) && (k == 0 || k == z)) {
+                *(colors_origin  + colors_index + 0) = 0.5f;// 3 * vx / 2;
+                *(colors_origin  + colors_index + 1) = 0.5f;// 3 * vy / 2;
+                *(colors_origin  + colors_index + 2) = 0.5f;// 3 * vz / 2;
+                } else {
+                *(colors_origin  + colors_index + 0) = 0.64f;// 3 * vx / 2;
+                *(colors_origin  + colors_index + 1) = 0.64f;// 3 * vy / 2;
+                *(colors_origin  + colors_index + 2) = 0.64f;// 3 * vz / 2;
+                }
+                colors_index += 3;
+
+
+            };
+
+    return 1;
+}
+
+
+static bool central_stars (int x, int y, int z,
+                            GLfloat *vertex_origin, GLfloat *colors_origin)
+{
+
+//            X - X   =     EAST - WEST    =   rouge - cyan
+//            Y - Y   =   ZENITH - NADIR   =   vert  - magenta
+//            Z - Z   =    SOUTH - NORTH   =   jaune - bleu
+
+
+    float max = fmax(x, y);
+    max = fmax(max, z);
+
+    float i, j, k, vx, vy, vz,
+    ad = 1 / max,
+    a_third = 0.3f * ad;  //  a_third donne la dimension de l'étoile centrale
+//    eps = 0.1 * ad;   //  eps(ilon) servira à décaler légèrement les pointes des flèches
+                      //  pour qu'elles n'aillent pas jusqu'aux faces des cubes
+
+
+    if (0) printf("central_stars  1 / max = %5.2f  max / 2 = %5.2f\n", ad, max / 2);
+
+    for (i = 0; i < x; i++)
+        for (j = 0; j < y; j++)
+            for (k = 0; k < z; k++){
+
+                vx = (2 * i / x - 1) * x / max + ad;
+                vy = (2 * j / y - 1) * y / max + ad;
+                vz = (2 * k / z - 1) * z / max + ad;
+
+                //  X - X  axis   Central Star
+
+                *(vertex_origin + vertex_index + 0) = vx + a_third;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(vertex_origin + vertex_index + 0) = vx - a_third;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+
+                //  Y - Y  axis   Central Star
+
+                *(vertex_origin + vertex_index + 0) = vx;
+                *(vertex_origin + vertex_index + 1) = vy + a_third;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(vertex_origin + vertex_index + 0) = vx;
+                *(vertex_origin + vertex_index + 1) = vy - a_third;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+
+                //  Z - Z  axis   Central Star
+
+                *(vertex_origin + vertex_index + 0) = vx;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz + a_third;
+
+                vertex_index += 3;
+
+                *(vertex_origin + vertex_index + 0) = vx;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz - a_third;
+
+                vertex_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 0.3f;
+                *(colors_origin  + colors_index + 2) = 0.3f;
+
+                colors_index += 3;
+
+            };
+
+
+    return 1;
+}
+
+
+static bool centers (int x, int y, int z,
+                     GLfloat *vertex_origin, GLfloat *colors_origin)
+{
+    float max = fmax(x, y);
+    max = fmax(max, z);
+
+    float i, j, k, vx, vy, vz,
+    ad = 1 / max,
+    eps = 0.0001 * ad;  //  eps(ilon) servira à décaler légèrement les deux vertex centraux
+                    // l'un source, l'autre cible, de couleurs différentes
+
+
+    if (0) printf("centers  eps(ilon) = %5.2f\n", eps);
+
+    for (i = 0; i < x; i++)
+        for (j = 0; j < y; j++)
+            for (k = 0; k < z; k++){
+
+                vx = (2 * i / x - 1) * x / max + ad;
+                vy = (2 * j / y - 1) * y / max + ad;
+                vz = (2 * k / z - 1) * z / max + ad;
+
+                *(vertex_origin + vertex_index + 0) = vx + eps;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 0.0f;
+                *(colors_origin  + colors_index + 1) = 0.0f;
+                *(colors_origin  + colors_index + 2) = 0.0f;
+
+                colors_index += 3;
+
+
+
+                *(vertex_origin + vertex_index + 0) = vx - eps;
+                *(vertex_origin + vertex_index + 1) = vy;
+                *(vertex_origin + vertex_index + 2) = vz;
+
+                vertex_index += 3;
+
+                *(colors_origin  + colors_index + 0) = 1.0f;
+                *(colors_origin  + colors_index + 1) = 1.0f;
+                *(colors_origin  + colors_index + 2) = 1.0f;
+
+                colors_index += 3;
+            };
+
+
+    return 1;
+}
+
+
+static void draw_line (GLuint *lines_origin, int a, int b)
+{
+    *(lines_origin + lines_index) = a; lines_index ++;
+    *(lines_origin + lines_index) = b; lines_index ++;
+}
+
+
+static void draw_ridges_3D (int x, int y, int z,
+                            int step_x, int step_y, int step_z,
+                            GLuint *lines_origin)
+{
+    draw_line (lines_origin, step_z * 0 + step_y * 0 + step_x * 0, step_z * 0 + step_y * 0 + step_x * x);
+    draw_line (lines_origin, step_z * 0 + step_y * 0 + step_x * 0, step_z * 0 + step_y * y + step_x * 0);
+    draw_line (lines_origin, step_z * 0 + step_y * 0 + step_x * 0, step_z * z + step_y * 0 + step_x * 0);
+    draw_line (lines_origin, step_z * z + step_y * y + step_x * x, step_z * 0 + step_y * y + step_x * x);
+    draw_line (lines_origin, step_z * z + step_y * y + step_x * x, step_z * z + step_y * y + step_x * 0);
+    draw_line (lines_origin, step_z * z + step_y * y + step_x * x, step_z * z + step_y * 0 + step_x * x);
+    draw_line (lines_origin, step_z * 0 + step_y * 0 + step_x * x, step_z * 0 + step_y * y + step_x * x);
+    draw_line (lines_origin, step_z * 0 + step_y * 0 + step_x * x, step_z * z + step_y * 0 + step_x * x);
+    draw_line (lines_origin, step_z * z + step_y * 0 + step_x * 0, step_z * z + step_y * y + step_x * 0);
+    draw_line (lines_origin, step_z * 0 + step_y * y + step_x * 0, step_z * 0 + step_y * y + step_x * x);
+    draw_line (lines_origin, step_z * 0 + step_y * y + step_x * 0, step_z * z + step_y * y + step_x * 0);
+    draw_line (lines_origin, step_z * z + step_y * 0 + step_x * 0, step_z * z + step_y * 0 + step_x * x);
+}
+
+
+static bool draw_grids_3D  (int x, int y, int z,
+                        int step_x, int step_y, int step_z,
+                        GLuint *lines_origin,
+                        int pref_show_grid)
+{
+    x ++; y ++; z ++;
+    float calcul = 0;
+
+    if (pref_show_grid % 2 == 0)
+        for (int u = 0; u < y; u ++){
+            for (int w = 0; w < x; w ++){
+                calcul = step_x * w + step_y * u;
+                *(lines_origin + lines_index) = calcul; lines_index ++;
+                *(lines_origin + lines_index) = calcul + step_y - step_z; lines_index ++;
+            }
+        }
+
+    if (pref_show_grid % 3 == 0)
+        for (int u = 0; u < z; u ++){
+            for (int w = 0; w < x; w ++){
+                calcul = step_x * w + step_z * u;
+                *(lines_origin + lines_index) = calcul; lines_index ++;
+                *(lines_origin + lines_index) = calcul + step_x - step_y; lines_index ++;
+            }
+        }
+
+    if (pref_show_grid % 5 == 0)
+        for (int u = 0; u < z; u ++){
+            for (int w = 0; w < y; w ++){
+                calcul = step_y * w + step_z * u;
+                *(lines_origin + lines_index) = calcul; lines_index ++;
+                *(lines_origin + lines_index) = calcul + step_x * (x - 1); lines_index ++;
+            }
+        }
+
+    return 0;
+}
+
+
+
+static void diagonal_test(int x, int y, int z,
+                          int step_x, int step_y, int step_z,
+                          GLuint *lines_origin)
+{
+    draw_line (lines_origin, 0, step_z * z + step_y * y + step_x * x);
+}
+
+
+static int draw_a_central_star(GLuint *lines_origin, int n)
+{
+    draw_line (lines_origin, n + 0, n + 1);
+    draw_line (lines_origin, n + 2, n + 3);
+    draw_line (lines_origin, n + 4, n + 5);
+    return n;
+}
+
+
+static void draw_3_x_4_around_6_poles(GLuint *lines_origin, int n, int side_size)
+{
+    /* N-S   C +/- f                                                          */
+    /* Z-A   C +/- side_size x f                                              */
+    /* E-W   C +/- side_size x side_size x f                                  */
+
+    /* ! WARNING !  Chaque étoile est dessinée deux fois   (je sais...)       */
+
+    int s = side_size * side_size * side_size / 2;
+    int z = side_size / 2;
+    int y = z * side_size;
+    int x = y * side_size;
+
+    draw_a_central_star (lines_origin, n + (s + x + y) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + x - y) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + x + z) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + x - z) * 6); // E
+
+    draw_a_central_star (lines_origin, n + (s - x + y) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - x - y) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - x + z) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - x - z) * 6); // W
+
+    draw_a_central_star (lines_origin, n + (s + y + x) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + y - x) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + y + z) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + y - z) * 6); // E
+
+    draw_a_central_star (lines_origin, n + (s - y + x) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - y - x) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - y + z) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - y - z) * 6); // W
+
+    draw_a_central_star (lines_origin, n + (s + z + x) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + z - x) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + z + y) * 6); // E
+    draw_a_central_star (lines_origin, n + (s + z - y) * 6); // E
+
+    draw_a_central_star (lines_origin, n + (s - z + x) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - z - x) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - z + y) * 6); // W
+    draw_a_central_star (lines_origin, n + (s - z - y) * 6); // W
+}
+
+static void draw_EW_ZA_SN_in_a_cubic_space(GLuint *lines_origin, int coeff, int space_X, int space_Y, int space_Z)
+{
+    /* N-S   C +/- f                                                          */
+    /* Z-A   C +/- side_size x f                                              */
+    /* E-W   C +/- side_size x side_size x f                                  */
+
+    int step_z = 1, step_y = space_Z, step_x = space_Z * space_Y;
+
+    // coeff = step_z * space_Z + step_y * space_Y + step_x * space_X
+    // for (int i = 0; i < space_X * space_Y * space_Z; i ++) draw_a_central_star (lines_origin, coeff + i * 6);
+    //                                               space_X = 9;   space_Y = 9;   space_Z = 9;
+    int s = space_X * space_Y * space_Z / 2;
+    //  int z = space_Z / 2;    int y = z * space_Y;    int x = y * space_X;
+
+    draw_a_central_star (lines_origin, coeff + (s + step_x) * 6 + 1); // W
+    draw_a_central_star (lines_origin, coeff + (s - step_x) * 6 + 1); // E
+    draw_a_central_star (lines_origin, coeff + (s + step_y) * 6 + 1); // Z
+    draw_a_central_star (lines_origin, coeff + (s - step_y) * 6 + 1); // A
+    draw_a_central_star (lines_origin, coeff + (s + step_z) * 6 + 1); // S
+    draw_a_central_star (lines_origin, coeff + (s - step_z) * 6 + 1); // N
+}
+
+static int draw_a_central_central_star(GLuint *lines_origin, int coeff, int volume)
+{
+/*  DANS UN CUBE DE COTE 3 LE CENTRE EST À   3 x 3 x 3 =  27 / 2 =  13,5  >>   13 * 6
+ *  DANS UN CUBE DE COTE 5 LE CENTRE EST À   5 x 5 x 5 = 125 / 2 =  62,5  >>   62 * 6
+ *  DANS UN CUBE DE COTE 7 LE CENTRE EST À   7 x 7 x 7 = 342 / 2 = 171,5  >>  171 * 6
+ *  ETC.
+ *  LES CUBES / ou parallelepipèdes / ONT DES COTÉS IMPAIRS POUR QU'IL Y AIT UNE CASE CENTRALE
+ */
+  //  int n = side_size * side_size * side_size / 2;
+    printf("draw_a_central_central_star >  ");
+    return draw_a_central_star(lines_origin, coeff + volume);
+}
+
+static float radius(int x, int y, int z, int space_X, int space_Y, int space_Z){
+    int center_X = space_X / 2, center_Y = space_Y / 2, center_Z = space_Z / 2;
+    float r = sqrt((center_X - x) * (center_X - x)
+                 + (center_Y - y) * (center_Y - y)
+                 + (center_Z - z) * (center_Z - z));
+    return r;
+}
+
+//   a = buffer_vertex_size_after_grids,  b = buffer_vertex_size_after_stars
+static void  experimental_1(GLuint *lines_origin, int space_X, int space_Y, int space_Z, int a, int b)
+{
+    float rayon = 0.0f, limit_sup = 1.4f, limit_inf = 0.0f;
+    int cubes_nb = space_X * space_Y * space_Z, center = cubes_nb / 2;
+    int step_z = 1, step_y = space_Z, step_x = space_Z * space_Y;
+    int coeff = step_z * space_Z + step_y * space_Y + step_x * space_X;
+    int u = 0, v = 0,
+    delta = 3 + 2 + 61 + 83 + 87 + 67 + 23 - 45 - 137 - 253 - 393 - 557 - 745
+            - 957 - 1193 - 1453 - 1737 - 2045 - 2377 - 2733 - 3113 - 3517;
+    delta -= 0;
+
+if (1) printf("space_XYZ (%d*%d*%d)  steps_xyz (%d,%d,%d)  coeff = %d = step_z * space_Z + step_y * space_Y + step_x * space_X\n",\
+              space_X, space_Y, space_Z, step_x, step_y, step_z, coeff);
+
+    for (int i = 0; i < space_X; i++)
+        for (int j = 0; j < space_Y; j++)
+            for (int k = 0; k < space_Z; k++){
+                rayon = radius(i, j, k, space_X, space_Y, space_Z);
+                if (rayon < limit_sup && rayon >= limit_inf){
+
+u = (i - space_X / 2) * step_x + (j - space_Y / 2) * step_y + (k - space_Z / 2) * step_z;
+v = i * step_x + j * step_y + k * step_z;
+
+if (1) printf("i,j,k =%2d,%2d,%2d    v = %4d   u = %4d\n", space_X / 2 - i, space_Y / 2 - j, space_Z / 2 - k, v, u);
+
+                    if (1) draw_a_central_star(lines_origin, coeff + center + v * 6 + delta);
+                    if (0) draw_a_central_star(lines_origin, coeff + cubes_nb * 6 / 2 + 2);
+                }
+            }
+if (1) printf("\n%d*%d*%d = cubes_nb = %d  (buffer_vertex_size_after_stars - after_grids)/18 = %d  rayon=%4.2f  coeff = %d  center = %d   delta = %d\n",\
+space_X, space_Y, space_Z, cubes_nb, (b-a)/18, rayon, coeff, center, delta);
+
+}
+
+// I'm standing on Earth (any planet or star or spinning spheroid, in fact)
+// and looking towards its North pole
+
+#define EAST   0 // + x  rouge
+#define WEST   1 // - x  cyan
+#define ZENITH 2 // + y  vert
+#define NADIR  3 // - y  magenta
+#define SOUTH  4 // + z  jaune
+#define NORTH  5 // - z  bleu
+
+bool draw_some_arrows (GLuint *lines_origin, int s, int stx, int sty,
+                              GLuint *arrows, int arrows_nb)  {return 1;}
+
+bool compute_space(int space_X, int space_Y, int space_Z,
+                   GLuint *arrows, int model_arrows_nb,
+                   int pref_show_grid, int pref_central_stars_nb,
+                   int pref_test_diagonal,
+                   int buffer_vertex_size_after_grids,
+                   int buffer_vertex_size_after_stars,
+                   GLfloat *vertex_origin, GLfloat *colors_origin,
+                   GLuint *lines_origin, GLuint *plans_origin)
+{
+    grids_intersections_volume (space_X, space_Y, space_Z, vertex_origin, colors_origin);
+    central_stars (space_X, space_Y, space_Z, vertex_origin, colors_origin);
+    centers (space_X, space_Y, space_Z, vertex_origin, colors_origin);
+    int step_z = 1, step_y =  space_Z + 1, step_x = (space_Z + 1) * (space_Y + 1);
+    if (pref_show_grid > 0) draw_ridges_3D (space_X, space_Y, space_Z, step_x, step_y, step_z, lines_origin);
+    draw_grids_3D(space_X, space_Y, space_Z, step_x, step_y, step_z, lines_origin, pref_show_grid);
+
+    int cubes_nb = space_X * space_Y * space_Z;  //  if ((space_X == space_Y) && (space_X == space_Z)) CUBE = 1;
+    int coeff = step_z * space_Z + step_y * space_Y + step_x * space_X;
+    int side_size = space_X, ad_hoc = 0, u = cubes_nb / 2 * 6;
+
+
+    if (0 && pref_central_stars_nb == 1) draw_a_central_star (lines_origin, coeff + cubes_nb * 3 - 2);
+    if (0 && pref_central_stars_nb == cubes_nb)
+        for (int i = 0; i < space_X * space_Y * space_Z; i ++) draw_a_central_star (lines_origin, coeff + i * 6);
+    if (1) experimental_1(lines_origin, space_X, space_Y, space_Z, buffer_vertex_size_after_grids, buffer_vertex_size_after_stars);
+    if (0) draw_a_central_central_star (lines_origin, coeff, cubes_nb * 6 / 2 - 2);
+    if (0) draw_EW_ZA_SN_in_a_cubic_space (lines_origin, coeff, space_X, space_Y, space_Z);
+    if (0) draw_3_x_4_around_6_poles (lines_origin, coeff, side_size);
+
+    if (pref_test_diagonal) diagonal_test  (space_X, space_Y, space_Z, step_x, step_y, step_z, lines_origin);
+    if (0) printf("    >>>    prochain objectif : dessiner un voisinage de Moore 3D sphérique.\n");
+    return 0;
+}
+
+/*
+
+delta = 2 + 3 + 61 + 83 + 87 + 67 + 23 - 45 - 137 - 253 - 393 - 557 - 745
+  - 957 - 1193 - 1453 - 1737 - 2045 - 2377 - 2733 - 3113 - 3517 ---
+
+------------------------------------------
+côté             dérivée_1      dérivée_2
+ c    (1)          (d1)              (d2)
+------------------------------------------
+ 1     -4 -   72 = -76    -76 --100 = 24
+ 3    -56 -   -4 = -52    -52 - -76 = 24
+ 5    -84 -  -56 = -28    -28 - -52 = 24
+ 7    -88 -  -84 =  -4     -4 - -28 = 24
+ 9    -68 -  -88 =  20     20 -  -4 = 24
+ 11   -23 -  -68 =  44     44 -  20 = 24
+ 13    45 -  -23 =  68     68 -  44 = 24
+ 15   137 -   45 =  92     92 -  68 = 24
+ 17   253 -  137 = 116    116 -  92 = 24
+ 19   393 -  253 = 140    140 - 116 = 24
+ 21   557 -  393 = 164    164 - 140 = 24
+ 23   745 -  557 = 188    188 - 164 = 24
+ 25   957 -  745 = 212    212 - 188 = 24
+ 27  1193 -  957 = 236    236 - 212 = 24
+ 29  1453 - 1193 = 260    260 - 236 = 24
+ 31  1737 - 1453 = 284    284 - 260 = 24
+ 33  2045 - 1737 = 308    308 - 284 = 24
+ 35  2377 - 2045 = 332    332 - 308 = 24
+ 37  2733 - 2377 = 356    356 - 332 = 24
+ 39  3113 - 2733 = 380    380 - 356 = 24
+ 41  3517 - 3113 = 404    404 - 380 = 24 ... etc.
+
+Pour calculer l'adresse mémoire des trois lignes
+qui dessinnent l'étoile située au centre d'un cube
+de côté 'c' il faut faire la somme des quatre termes :
+- coeff_1 = step_z * space_Z + step_y * space_Y + step_x * space_X
+- coeff_2 = (i * step_x + j * step_y + k * step_z) * 6
+- center  = space_X * space_Y * space_Z / 2      et
+- delta   = sigma (de 1 à c) des termes de la colonne 1
+
+ */
+
+
+
+
+
+
+
+
+//      S C O R I E S      ---------------------------------------------------
+
+
+
+
+
+
+
+
+/* ------------------------------------------------------------------------*/
+/*            3               5                7                 11        */
+/* ------------------------------------------------------------------------*/
+/*  C        13              62              171                           */
+/*  step_x   16              36               49                           */
+/*  step_y    4               6                8                           */
+/*  step_y    4               6                8                           */
+/*  |side/2|  1   (f)         2                3                  4        */
+/* ------------------------------------------------------------------------*/
+/*  N-S   C +/- f                                                          */
+/*  Z-A   C +/- side x f                                                   */
+/*  E-W   C +/- side x side x f                                            */
+/* -----  if side  = 3  ---------------------------------------------------*/
+/*  W         4 (- 9)        12 (- 50)        24 (- 147)                   */
+/*  E        22 (+ 9)       112 (+ 50)       318 (+ 147)                   */
+/*  A        10 (- 3)        52 (- 10)       150 (-  21)                   */
+/*  Z        16 (+ 3)        72 (+ 10)       192 (+  21)                   */
+/*  S        12 (- 1)        60 (-  2)       168 (-   3)                   */
+/*  N        14 (+ 1)        64 (+  2)       174 (+   3)                   */
+/*                                                                         */
+//    draw_a_central_star (lines_origin, s +  14 * 6);
+
+/*  EZ       25   22+3                                                     */
+/*  EA       19   22-3                                                     */
+/*  ES       21   22-1                                                     */
+/*  EN       23   22+1                                                     */
+
+/*  WZ        7    4+3                                                     */
+/*  WA        1    4-3                                                     */
+/*  WS        3    4-1                                                     */
+/*  WN        5    4+1                                                     */
+
+/*  ZE       25   16+9                                                     */
+/*  ZW        7   16-9                                                     */
+/*  ZS       15   16-1                                                     */
+/*  ZN       17   16+1                                                     */
+
+/*  AE       19   10+9                                                     */
+/*  AW        1   10-9                                                     */
+/*  AS        9   10-1                                                     */
+/*  AN       11   10+1                                                     */
+/*                                                                         */
+/*  SE       21   12+9                                                     */
+/*  SW        3   12-9                                                     */
+/*  SZ       15   12+3                                                     */
+/*  SA        9   12-3                                                     */
+/*                                                                         */
+/*  NE       23   14+9                                                     */
+/*  NW        5   14-9                                                     */
+/*  NZ       17   14+3                                                     */
+/*  NA       11   14-3                                                     */
+/*                                                                         */
+/*                                                                         */
+/* -----------------------  if side = 5  ----------------------------------*/
+/*  WN                       12 (- 50)        24 (- 147)                   */
+
+
+
+
+
+
+
+
+
+
+
+
+/* static void draw_an_arrow_East_or_West (GLuint *lines_origin, int s, int weight, int site) */
+/* { */
+/*     draw_line (lines_origin, s + 2, s + 6 + site % 2); */
+/*     draw_line (lines_origin, s + 3, s + 6 + site % 2); */
+
+/*     draw_line (lines_origin, s + 4, s + 6 + site % 2); */
+/*     draw_line (lines_origin, s + 5, s + 6 + site % 2); */
+/* } */
+
+/* static void draw_an_arrow_Zenith_or_Nadir (GLuint *lines_origin, int s, int weight, int site) */
+/* { */
+/*     draw_line (lines_origin, s + 0, s + 8 + site % 2); */
+/*     draw_line (lines_origin, s + 1, s + 8 + site % 2); */
+
+/*     draw_line (lines_origin, s + 4, s + 8 + site % 2); */
+/*     draw_line (lines_origin, s + 5, s + 8 + site % 2); */
+/* } */
+
+/* static void draw_an_arrow_North_or_South (GLuint *lines_origin, int s, int weight, int site) */
+/* { */
+/*     draw_line (lines_origin, s + 0, s + 10 + site % 2); */
+/*     draw_line (lines_origin, s + 1, s + 10 + site % 2); */
+
+/*     draw_line (lines_origin, s + 2, s + 10 + site % 2); */
+/*     draw_line (lines_origin, s + 3, s + 10 + site % 2); */
+/* } */
+
+
+
+

src/graphics/scories.c.forget

@@ -0,0 +1,394 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file was part of Gem-graph.  Forget it now.
+ *
+ *  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 <stdbool.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <epoxy/gl.h>
+#include <GL/glu.h>
+#include <GL/glext.h>
+#include <glib-2.0/glib.h>
+#include <math.h>
+#include <errno.h>
+
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+#include "../../include/buffers.h"
+
+static long vertex_index = 0;
+static long colors_index = 0;
+static long lines_index = 0;
+static long plans_index = 0;
+
+
+#define V 0
+
+static bool compute_space_2D(int size_x,
+                             int size_y,
+                             int size_z,
+
+                             int pref_mark_unit_space,
+                             int pref_style_lines_planes,
+                             int pref_style_mix_colors,
+
+                             GLfloat *vertex_origin,
+                             GLfloat *colors_origin,
+                             GLuint *lines_origin,
+                             GLuint *plans_origin)
+{
+
+    float x = 0;
+    // for (int k = 0; k < size_x + 1; k++)  <=>  + 1
+    // car on passe du nombre de cases  = (n)
+    // au nombre de séparations entre les cases + les deux bords  = (n + 1)
+
+    if (V) printf("space_2D   vertex   ");
+    for (int k = 0; k < size_x; k++){  // barres verticales
+                                               //
+        x = ((size_x % 2) * (size_x / 2 - k)
+           + (size_x % 2 - 1) * (k + 0.5f - size_x / 2)) / size_x * 2;
+
+        if (V) printf("[%1.1f]  ", x);
+
+        *(vertex_origin + k * 6 + 0) = - x;
+        *(vertex_origin + k * 6 + 1) = 1.0f / size_x;
+        *(vertex_origin + k * 6 + 2) = 0.0f;
+
+        *(vertex_origin + k * 6 + 3) =  - x;
+        *(vertex_origin + k * 6 + 4) = - 1.0f / size_x;
+        *(vertex_origin + k * 6 + 5) = 0.0f;
+
+        // fun > if (k == size_x - 1) *(vertex_origin + k * 6 + 5) = 0.1f;
+
+        vertex_index += 6; if (V) printf(" => vertex_index = %3ld space 2D\n", vertex_index);
+
+        *(colors_origin  + k * 6 + 0) = 1;
+        *(colors_origin  + k * 6 + 1) = 0;
+        *(colors_origin  + k * 6 + 2) = 0;
+
+        *(colors_origin  + k * 6 + 3) = 1;
+        *(colors_origin  + k * 6 + 4) = 1;
+        *(colors_origin  + k * 6 + 5) = 0;
+
+        colors_index += 6;
+
+        *(lines_origin + k * 2 + 0) = k * 2 + 0;
+        *(lines_origin + k * 2 + 1) = k * 2 + 1;
+
+        lines_index += 2; if (V) printf(" => lines_index = %3ld space 2D\n", lines_index);
+    }
+
+    *(colors_origin  + 0) = 0;
+    *(colors_origin  + 1) = 0;
+    *(colors_origin  + 2) = 0;
+
+    *(colors_origin  + 3) = 1;
+    *(colors_origin  + 4) = 1;
+    *(colors_origin  + 5) = 1;
+
+    *(colors_origin  + (size_x - 1) * 6 + 0) = 1;
+    *(colors_origin  + (size_x - 1) * 6 + 1) = 1;
+    *(colors_origin  + (size_x - 1) * 6 + 2) = 1;
+
+    *(colors_origin  + (size_x - 1) * 6 + 3) = 0;
+    *(colors_origin  + (size_x - 1) * 6 + 4) = 0;
+    *(colors_origin  + (size_x - 1) * 6 + 5) = 0;
+
+    colors_index += 12; if (V) printf(" => colors_index = %ld\n", colors_index);
+
+    *(lines_origin + lines_index + 0) = 0;
+    *(lines_origin + lines_index + 1) = size_x * 2 - 2; // barre horizontale du bas
+
+    *(lines_origin + lines_index + 2) = 1;
+    *(lines_origin + lines_index + 3) = size_x * 2 - 1; // barre horizontale du haut
+
+    lines_index += 4; if (V) printf("H=> lines_index = %3ld space 2D H\n", lines_index);
+
+    if (pref_mark_unit_space == 1 || pref_mark_unit_space == 3)  //  diagonales to mark first space unit
+    {
+        *(lines_origin + lines_index + 0) = 0;
+        *(lines_origin + lines_index + 1) = 3;
+
+        *(lines_origin + lines_index + 2) = 1;
+        *(lines_origin + lines_index + 3) = 2;
+
+        lines_index += 4; if (V) printf("X=> lines_index = %3ld space 2D X\n", lines_index);
+
+    }
+
+    if (pref_mark_unit_space == 2 || pref_mark_unit_space == 3)  //  diagonales to mark last space unit
+    {
+        *(lines_origin + lines_index + 0) = (size_x - 2) * 2 + 0;
+        *(lines_origin + lines_index + 1) = (size_x - 2) * 2 + 3;
+
+        *(lines_origin + lines_index + 2) = (size_x - 2) * 2 + 1;
+        *(lines_origin + lines_index + 3) = (size_x - 2) * 2 + 2;
+
+        lines_index +=4; if (V) printf("X=> lines_index = %3ld space 2D X\n", lines_index);
+
+    }
+
+    if (V) printf(" n = %d x 2   côté = [%1.1f]\n", size_x + 1, 2.0f / size_x);
+    if (V) printf("space_2D   lines_origin    (%d - size_x(0)) x (%d - size_x(1))  ", 0, 1);
+    for (int v = 0; v < size_x + 2; v++)
+        if (V) printf("(%d-%d)   ", *(lines_origin + v), *(lines_origin + v + 1));
+    if (V) printf("  n = 4 + (%d x 2)\n", size_x + 2);
+
+  return 1;
+}
+
+static int compute_arrow_2D(int size_x,
+                            int size_y,
+                            int size_z,
+
+                            int weight,
+                            int site,
+                            int x,
+                            int y,
+                            int z,
+
+                            int pref_style_lines_planes,
+                            int pref_style_mix_colors,
+
+                            GLfloat *vertex_origin,
+                            GLfloat *colors_origin,
+                            GLuint *lines_origin,
+                            GLuint *plans_origin)
+{
+    printf("compute_arrow_2D   load = %d   site = %d   x = %d\n", weight, site, x);
+    float zero = 0.0f;
+    float center = (1.0f / size_x) * (2 * x - size_x + 2);
+    float tip = center + (2 * site - 1) * (1.0f / size_x - 0.01f);
+    float base = center + (2 * site - 1) * (0.1f / size_x);
+    float lat = 0.4f / size_x;
+
+    /* for (int i = 0; i < size_x; i++) */
+    /*     for (int j = 0; j < size_y; j++) */
+    /*         for (int k = 0; k < size_z; k++) */
+    /* { */
+
+    /*     x = - ((size_x % 2) * (size_x / 2 - i) */
+    /*         - (size_x % 2 - 1) * (i + 0.5f - size_x / 2)) / size_x * 2 * EDGE; */
+    /*     y = - ((size_x % 2) * (size_x / 2 - j) */
+    /*         - (size_x % 2 - 1) * (j + 0.5f - size_x / 2)) / size_x * 2 * EDGE; */
+    /*     z = - ((size_x % 2) * (size_x / 2 - k) */
+    /*         - (size_x % 2 - 1) * (k + 0.5f - size_x / 2)) / size_x * 2 * EDGE; */
+    /* } */
+
+    *(vertex_origin + vertex_index + 0) = tip;
+    *(vertex_origin + vertex_index + 1) = zero;
+    *(vertex_origin + vertex_index + 2) = zero;
+
+    *(vertex_origin + vertex_index + 3) = base;
+    *(vertex_origin + vertex_index + 4) = lat;
+    *(vertex_origin + vertex_index + 5) = zero;
+
+    *(vertex_origin + vertex_index + 6) = base;
+    *(vertex_origin + vertex_index + 7) = - lat;
+    *(vertex_origin + vertex_index + 8) = zero;
+
+    vertex_index += 9; if (V) printf(" => vertex_index = %3ld arrow_2D\n", vertex_index);
+
+    if (pref_style_lines_planes == 0) {
+
+        if (V) printf("0=> lines_index = %ld\n", lines_index);
+
+        *(lines_origin + lines_index + 0) = vertex_index / 3 - 3;
+        *(lines_origin + lines_index + 1) = vertex_index / 3 - 2;
+
+        *(lines_origin + lines_index + 2) = vertex_index / 3 - 3;
+        *(lines_origin + lines_index + 3) = vertex_index / 3 - 1;
+
+        *(lines_origin + lines_index + 4) = vertex_index / 3 - 2;
+        *(lines_origin + lines_index + 5) = vertex_index / 3 - 1;
+
+        lines_index += 6;  if (V) printf("|=> lines_index = %3ld arrow_2D\n", lines_index);
+    }
+
+
+    if (pref_style_lines_planes == 1) {
+        *(plans_origin + plans_index + 0) = vertex_index / 3 + 0;
+        *(plans_origin + plans_index + 1) = vertex_index / 3 + 1;
+        *(plans_origin + plans_index + 2) = vertex_index / 3 + 2;
+
+        *(plans_origin + plans_index + 3) = vertex_index / 3 + 0;
+        *(plans_origin + plans_index + 4) = vertex_index / 3 + 1;
+        *(plans_origin + plans_index + 5) = vertex_index / 3 + 2;
+
+        plans_index += 6;  if (V) printf("|=> plans_index = %ld\n", plans_index);
+    }
+    return 0;
+}
+
+        /* x = - ((size_x % 2) * (size_x / 2 - i) */
+        /*     - (size_x % 2 - 1) * (i + 0.5f - size_x / 2)) / size_x * 2 * EDGE; */
+        /* y = - ((size_y % 2) * (size_y / 2 - j) */
+        /*     - (size_y % 2 - 1) * (j + 0.5f - size_y / 2)) / size_y * 2 * EDGE; */
+        /* z = - ((size_z % 2) * (size_z / 2 - k) */
+        /*     - (size_z % 2 - 1) * (k + 0.5f - size_z / 2)) / size_z * 2 * EDGE; */
+
+static bool compute_arrow_3D(long size_x,
+                             long size_y,
+                             long size_z,
+
+                             int weight,
+                             int site,  //  North, South, East, West, Zenith, nAdir  (NSEWZA)
+                             long x,
+                             long y,
+                             long z,
+
+                             int pref_style_lines_planes,
+                             int pref_style_mix_colors,
+
+                             GLfloat *vertex_origin,
+                             GLfloat *colors_origin,
+                             GLuint *lines_origin,
+                             GLuint *plans_origin)
+
+{
+    float zero = 0.0f;
+    float center = (1.0f / size_x) * (2 * x - size_x + 2);
+    float tip = center + (2 * site - 1) * (1.0f / size_x);
+    float base = center + (2 * site - 1) * (0.1f / size_x);
+
+    *(vertex_origin + vertex_index + 0) = center + (2 * site - 1) * (1.0f / size_x - 0.01f);
+    *(vertex_origin + vertex_index + 1) = zero;
+    *(vertex_origin + vertex_index + 2) = zero;
+
+    *(vertex_origin + vertex_index + 3) = base;
+    *(vertex_origin + vertex_index + 4) = 0.4f / size_x;
+    *(vertex_origin + vertex_index + 5) = 0.4f / size_x;
+
+    *(vertex_origin + vertex_index + 6) = base;
+    *(vertex_origin + vertex_index + 7) = 0.4f / size_x;
+    *(vertex_origin + vertex_index + 8) = - 0.4f / size_x;
+
+    *(vertex_origin + vertex_index + 9) = base;
+    *(vertex_origin + vertex_index + 10) = - 0.4f / size_x;
+    *(vertex_origin + vertex_index + 11) = - 0.4f / size_x;
+
+    *(vertex_origin + vertex_index + 12) = base;
+    *(vertex_origin + vertex_index + 13) = - 0.4f / size_x;
+    *(vertex_origin + vertex_index + 14) = 0.4f / size_x;
+
+    vertex_index += 15; if (V) printf(" => vertex_index = %3ld arrow_3D\n", vertex_index);
+
+    if (V) printf("center = %f   tip = %f   base = %f\n",\
+         center, tip, base);      // size_x * 12=%d  igap=%d
+
+    if (pref_style_lines_planes == 0) {
+
+        *(lines_origin + lines_index + 0) = vertex_index / 3 - 5;
+        *(lines_origin + lines_index + 1) = vertex_index / 3 - 4;
+
+        *(lines_origin + lines_index + 2) = vertex_index / 3 - 5;
+        *(lines_origin + lines_index + 3) = vertex_index / 3 - 3;
+
+        *(lines_origin + lines_index + 4) = vertex_index / 3 - 5;
+        *(lines_origin + lines_index + 5) = vertex_index / 3 - 2;
+
+        *(lines_origin + lines_index + 6) = vertex_index / 3 - 5;
+        *(lines_origin + lines_index + 7) = vertex_index / 3 - 1;
+
+        *(lines_origin + lines_index + 8) = vertex_index / 3 - 4;
+        *(lines_origin + lines_index + 9) = vertex_index / 3 - 3;
+
+        *(lines_origin + lines_index + 10) = vertex_index / 3 - 3;
+        *(lines_origin + lines_index + 11) = vertex_index / 3 - 2;
+
+        *(lines_origin + lines_index + 12) = vertex_index / 3 - 2;
+        *(lines_origin + lines_index + 13) = vertex_index / 3 - 1;
+
+        *(lines_origin + lines_index + 14) = vertex_index / 3 - 1;
+        *(lines_origin + lines_index + 15) = vertex_index / 3 - 4;
+
+        lines_index += 16;  if (V) printf("|=> lines_index = %3ld arrow_3D\n", lines_index);
+    }
+
+    if (pref_style_lines_planes == 1) {
+
+    *(plans_origin + plans_index + 0) = size_x * 12 / 3 + 0;
+    *(plans_origin + plans_index + 1) = size_x * 12 / 3 + 1;
+    *(plans_origin + plans_index + 2) = size_x * 12 / 3 + 2;
+
+    *(plans_origin + plans_index + 3) = size_x * 12 / 3 + 0;
+    *(plans_origin + plans_index + 4) = size_x * 12 / 3 + 3;
+    *(plans_origin + plans_index + 5) = size_x * 12 / 3 + 4;
+
+    *(plans_origin + plans_index + 0) = size_x * 12 / 3 + 0;
+    *(plans_origin + plans_index + 1) = size_x * 12 / 3 + 1;
+    *(plans_origin + plans_index + 2) = size_x * 12 / 3 + 3;
+
+    *(plans_origin + plans_index + 3) = size_x * 12 / 3 + 0;
+    *(plans_origin + plans_index + 4) = size_x * 12 / 3 + 2;
+    *(plans_origin + plans_index + 5) = size_x * 12 / 3 + 4;
+
+    plans_index += 12;  if (V) printf("|=> plans_index = %3ld arrow_3D\n", plans_index);
+    }
+
+    return 1;
+}
+
+static void old_arrows(int model_arrows_nb,
+                       long model_size_x, long model_size_y, long model_size_z,
+                       int pref_style_lines_planes, int pref_style_mix_colors,
+                       GLuint *arrows, GLfloat *vertex_origin, GLfloat *colors_origin,
+                       GLuint *lines_origin, GLuint *plans_origin)
+{
+    for (int i = 0; i < model_arrows_nb; i++)
+        compute_arrow_3D     (model_size_x,
+                              model_size_y,
+                              model_size_z,
+
+                              *(arrows + i * 5 + 0), // weight (load)
+                              *(arrows + i * 5 + 1), // site
+                              *(arrows + i * 5 + 2), // x
+                              *(arrows + i * 5 + 3), // y
+                              *(arrows + i * 5 + 4), // z
+
+                              pref_style_lines_planes,
+                              pref_style_mix_colors,
+
+                              vertex_origin,
+                              colors_origin,
+                              lines_origin,
+                              plans_origin);
+
+}
+
+
+    // OLD ARROWS (DEPRECATED)
+    /* old_arrows     (model_arrows_nb, model_size_x, model_size_y, model_size_z, arrows, */
+    /*                 pref_style_lines_planes, pref_style_mix_colors, */
+    /*                 vertex_origin, colors_origin, lines_origin, plans_origin); */
+
+
+
+
+

src/main.c

@@ -0,0 +1,50 @@
+/*
+ *      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/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/shaders/shader.vert

@@ -0,0 +1,18 @@
+#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);
+}

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");
+
+    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/events.c

@@ -0,0 +1,325 @@
+/*
+ *      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("edition");
+}
+
+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");
+}
+
+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");
+}
+
+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");
+}
+
+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)
+{
+
+    // XXX set selon l'id de la GLArea
+
+    int axis = GPOINTER_TO_INT(data);
+
+    g_assert(axis >= 0 && axis < N_AXIS);
+
+    /* Update the rotation angle */
+    rotation_angles[axis] = gtk_adjustment_get_value(adjustment); //XXX selon widget
+
+    /* Update the contents of the GL drawing area */
+    gtk_widget_queue_draw(gl_area);
+}
+
+gboolean on_render(GtkGLArea *area, GdkGLContext *context)
+{
+    if(gtk_gl_area_get_error(area) != NULL)
+        return false;
+
+    graphics_draw(gtk_widget_get_name(GTK_WIDGET(area)));
+
+    return true;
+}
+
+
+/* We need to set up our state when we realize the GtkGLArea widget */
+void on_realize(GtkWidget *widget)
+{
+    gtk_gl_area_make_current(GTK_GL_AREA(widget));
+
+    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL)
+        return;
+
+    if (graphics_init(gtk_widget_get_name(widget)) == false) {
+        ui_send_internal_notification("Failed to allocate GLArea !");
+    }
+}
+
+/* We should tear down the state when unrealizing */
+void on_unrealize(GtkWidget *widget)
+{
+    gtk_gl_area_make_current(GTK_GL_AREA(widget));
+
+    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL)
+        return;
+
+    if (graphics_shutdown(gtk_widget_get_name(widget))) {
+        ui_send_internal_notification("Failed to allocate GLArea !");
+    }
+}
+
+void on_close_window(GtkWidget *widget)
+{
+    /* Reset the state */
+    gl_area = NULL;
+
+
+    //XXX unset selon l'id de la GLArea
+
+    rotation_angles[X_AXIS] = 0.0;
+    rotation_angles[Y_AXIS] = 0.0;
+    rotation_angles[Z_AXIS] = 0.0;
+}
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * 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");
+}

src/ui/gemgraph.ui

@@ -0,0 +1,343 @@
+<?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="run_controls">
+                            <property name="margin-top">50</property>
+                            <property name="margin-bottom">50</property>
+                            <property name="orientation">horizontal</property>
+                            <child>
+                              <object class="GtkToggleButton" id="run_play_control">
+                                <property name="icon-name"></property>
+                              </object>
+                            </child>
+                          </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">
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkGlArea" id="run_glarea">
+                          </object>
+                        </child>
+                        <child>
+                          <object class="GtkBox" id="glarea_controls">
+                          </object>
+                        </child>
+                      </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">
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkGlArea" id="presentation_glarea">
+                          </object>
+                        </child>
+                        <child>
+                          <object class="GtkBox" id="presentation_controls">
+                          </object>
+                        </child>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkStackPage">
+                    <property name="name">edition</property>
+                    <property name="child">
+                      <object class="GtkBox">
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkGlArea" id="edition_glarea">
+                          </object>
+                        </child>
+                        <child>
+                          <object class="GtkBox" id="edition_controls">
+                          </object>
+                        </child>
+                      </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/window.c

@@ -0,0 +1,289 @@
+/*
+ *      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"
+
+/* -------------------------------------------------------------------------- */
+
+float rotation_angles[N_AXIS] = { 0.0 }; // Rotation angles on each axis
+
+GtkWidget *gl_area = NULL;
+
+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;
+    GtkGLArea *run_glarea;
+    GtkBox *run_controls;
+};
+
+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,
+                                       run_glarea);
+    gtk_widget_class_bind_template_child(widget_class,
+                                       GemGraphClientWindow,
+                                       run_controls);
+}
+
+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();
+
+    // Setup GLArea
+    ui_setup_glarea(window->run_glarea, window->run_controls);
+}
+
+/* -------------------------------------------------------------------------- */
+
+void ui_set_stack(const char *mode)
+{
+
+    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;
+    }
+    gtk_stack_set_visible_child_full(window->main_stack,
+                                     mode,
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+    gtk_stack_set_visible_child_full(window->side_stack,
+                                     mode,
+                                     GTK_STACK_TRANSITION_TYPE_CROSSFADE);
+
+    // Switch on the first letter of the mode, because switch is soooo simple :)
+    switch(mode[0]) {
+        case 'e':
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "document-edit-symbolic");
+            break;
+        case 'r':
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "system-run-symbolic");
+            break;
+        case 'p':
+            gtk_menu_button_set_icon_name(window->main_button_mode,
+                                     "x-office-presentation-symbolic");
+            break;
+        case 'h':
+            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);
+}
+
+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);
+}
+
+static inline 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),
+                                        GINT_TO_POINTER(axis));
+    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;
+}
+
+void ui_setup_glarea(GtkGLArea *target, GtkBox *target_controls)
+{
+    int i, minor=4, major=0;
+    GtkWidget *controls;
+
+    gl_area = GTK_WIDGET(target);
+    controls = GTK_WIDGET(target_controls);
+    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);
+
+    // We need to initialize and free GL resources, so we use
+    // the realize and unrealize signals on the widget
+    //
+    g_signal_connect(gl_area, "realize", G_CALLBACK(on_realize), NULL);
+    g_signal_connect(gl_area, "unrealize", G_CALLBACK(on_unrealize), NULL);
+
+    // The main "draw" call for GtkGLArea
+    g_signal_connect(gl_area, "render", G_CALLBACK(on_render), NULL);
+
+    gtk_widget_set_hexpand(controls, TRUE);
+
+    for(i = 0; i < N_AXIS; i++)
+        gtk_box_append(GTK_BOX(controls), create_axis_slider(i));
+
+    gtk_gl_area_set_auto_render(target, true);
+
+    gtk_widget_show(GTK_WIDGET(gl_area));
+    gtk_gl_area_set_required_version( GTK_GL_AREA(gl_area), minor, major);
+    gtk_gl_area_get_required_version( GTK_GL_AREA(gl_area), &minor, &major);
+}
+
+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);
+    }
+}
+