WIP: Une erreur de segmentation (dans le fonction create_arrow(), je suppose)

src/graphics.c : contains all primitives on buffers and control
src/arrows.c : contains all complex writing for arrows constructions
src/grid.c : contains all complexe writing for grid construction

Co-developed-by: Jean Sirmai <jean@a-lec.org>
Signed-off-by: Adrien Bourmault <neox@a-lec.org>

.gitignore

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

LICENSE

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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+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}
+
+

README.md

@@ -1,2 +0,0 @@
-# Gem-graph Client
-

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+         id="path175-3"
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+    </g>
+    <path
+       id="path173"
+       style="display:inline;fill:#ecc73b;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.338;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:0.84;paint-order:stroke fill markers"
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+  </g>
+</svg>

draft getters-setters & co (résumé)

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

include/arrows.h

@@ -0,0 +1,79 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <unistd.h>
+#include <stdbool.h>
+#include <GL/glu.h>
+
+/*
+ *  Writes basis and tip for all arrows into vertex and color buffers
+ *
+ *  @param dimensions (x,y,z)
+ *
+ *  @return void
+ */
+void arrows_write_terminations (long x, long y, long z);
+
+/*
+ *  Writes lines for arrow oriented to the east or west into lines buffer
+ *
+ *  @param s,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_east_west (long s, int weight, int site);
+
+/*
+ *  Writes lines for arrow oriented to the zenith or nadir into lines buffer
+ *
+ *  @param s,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_zenith_nadir (long s, int weight, int site);
+
+/*
+ *  Writes lines for arrow oriented to the south or north into lines buffer
+ *
+ *  @param s,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_south_north (long s, int weight, int site);
+
+/*
+ *  Writes three lines that draw arrow basis (central star) into lines buffer
+ *
+ *  @param n
+ *
+ *  @return void
+ */
+void arrows_write_basis(long n);

include/base.h

@@ -0,0 +1,96 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: Base header
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <glib-2.0/glib.h>
+#define G_APPLICATION_DEFAULT_FLAGS 0
+
+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));
+    assert (contents);
+
+    lseek(fd, 0, SEEK_SET);
+    read(fd,contents,filesize);
+
+    contents[filesize-1] = '\0';
+
+    close(fd);
+
+    return contents;
+}
+
+/* I'm standing on Earth (any planet or star or spinning spheroid, in fact)
+ * and looking towards its North pole
+ *
+ *  X - X   =   EAST   - WEST    =   rouge - cyan
+ *  Y - Y   =   ZENITH - NADIR   =   vert  - magenta
+ *  Z - Z   =   NORTH  - SOUTH   =   bleu  - jaune
+ */
+
+#define EAST   0 // + x  rouge
+#define WEST   1 // - x  cyan
+#define ZENITH 2 // + y  vert
+#define NADIR  3 // - y  magenta
+#define SOUTH  4 // - z  jaune
+#define NORTH  5 // + z  bleu

include/graphics.h

@@ -0,0 +1,275 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include "base.h"
+#include <unistd.h>
+#include <stdbool.h>
+#include <epoxy/gl.h>
+#include <GL/glu.h>
+#include <GL/glext.h>
+
+/*
+ * 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
+
+};
+
+/*
+ * Find gl_area_entry from a gl_area ptr
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ *
+ * @return  entry ptr
+ */
+struct gl_area_entry *graphics_find_glarea_from_ptr(const char *name);
+
+/*
+ * 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
+ * Calls according to the user preferences
+ * @param   gl_area, ptr to the gl_area widget
+ * @return  void
+ */
+void graphics_init_buffers(const void *gl_area);
+
+/*
+ *  Writes values to describe a line from a to b into the line buffer
+ *
+ *  @param coords GLuint (a,b)
+ *
+ *  @return void
+ */
+void graphics_write_line (GLuint a, GLuint b);
+
+/*
+ *  Writes values to describe a vertex at (x,y,z) into the vertex buffer
+ *
+ *  @param coords GLfloat(x,y,z)
+ *
+ *  @return void
+ */
+void graphics_write_vertex (GLfloat x, GLfloat y, GLfloat z);
+
+/*
+ *  Writes values to describe a color (r,g,b) into the color buffer
+ *
+ *  @param color GLfloat(r,g,b)
+ *
+ *  @return void
+ */
+void graphics_write_color (GLfloat r, GLfloat g, GLfloat b);
+
+/*
+ *  Writes values to describe an (a,b,c) plan (triangle) into the plan buffer
+ *
+ *  @param coords GLuint (a,b,c)
+ *
+ *  @return void
+ */
+void graphics_write_plan (GLuint a, GLuint b, GLuint c);
+
+/*
+ * Initializes an identity matrix
+ *
+ * @param   res, target ptr
+ *
+ * @return  void
+ */
+static inline void compute_i(float *res)
+{
+    /* initialize to the identity matrix */
+    res[0] = 1.f; res[4] = 0.f; res[8] = 0.f; res[12] = 0.f;
+    res[1] = 0.f; res[5] = 1.f; res[9] = 0.f; res[13] = 0.f;
+    res[2] = 0.f; res[6] = 0.f; res[10] = 1.f; res[14] = 0.f;
+    res[3] = 0.f; res[7] = 0.f; res[11] = 0.f; res[15] = 1.f;
+}
+
+/*
+ * Computes the projection matrix
+ *
+ * @param   res, target ptr
+ *          phi, XXX
+ *          theta, XXX
+ *          psi, XXX
+ *
+ * @return  void
+ */
+static inline void compute_mvp(float *res, float phi, float theta, float psi)
+{
+    float x = phi *(G_PI / 180.f);
+    float y = theta *(G_PI / 180.f);
+    float z = psi *(G_PI / 180.f);
+    float c1 = cosf(x), s1 = sinf(x);
+    float c2 = cosf(y), s2 = sinf(y);
+    float c3 = cosf(z), s3 = sinf(z);
+    float c3c2 = c3 * c2;
+    float s3c1 = s3 * c1;
+    float c3s2s1 = c3 * s2 * s1;
+    float s3s1 = s3 * s1;
+    float c3s2c1 = c3 * s2 * c1;
+    float s3c2 = s3 * c2;
+    float c3c1 = c3 * c1;
+    float s3s2s1 = s3 * s2 * s1;
+    float c3s1 = c3 * s1;
+    float s3s2c1 = s3 * s2 * c1;
+    float c2s1 = c2 * s1;
+    float c2c1 = c2 * c1;
+
+    compute_i(res);
+
+    /* apply all three rotations using the three matrices:
+     *
+     * ⎡  c3 s3  0 ⎤ ⎡ c2  0 -s2 ⎤ ⎡ 1   0  0 ⎤
+     * ⎢ -s3 c3  0 ⎥ ⎢  0  1   0 ⎥ ⎢ 0  c1 s1 ⎥
+     * ⎣  0   0  1 ⎦ ⎣ s2  0  c2 ⎦ ⎣ 0 -s1 c1 ⎦
+     */
+    res[0] = c3c2;  res[4] = s3c1 + c3s2s1; res[8] = s3s1 - c3s2c1; res[12] = 0.f;
+    res[1] = -s3c2; res[5] = c3c1 - s3s2s1; res[9] = c3s1 + s3s2c1; res[13] = 0.f;
+    res[2] = s2;    res[6] = -c2s1;         res[10] = c2c1;         res[14] = 0.f;
+    res[3] = 0.f;   res[7] = 0.f;           res[11] = 0.f;          res[15] = 1.f;
+}
+
+/*
+ * Created and compile a shader
+ *
+ * @param   type, shader type
+ *          src, source code of shader
+ *
+ * @return  shader id
+ */
+// static inline GLuint create_shader(int type, const char *src)
+// {
+//     GLuint shader;
+//     int status;
+
+//     shader = glCreateShader(type);
+//     glShaderSource(shader, 1, &src, NULL);
+//     glCompileShader(shader);
+
+//     glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+//     if(status == GL_FALSE) {
+//         int log_len;
+//         char *buffer;
+
+//         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
+
+//         buffer = g_malloc(log_len + 1);
+//         assert (buffer);
+//         glGetShaderInfoLog(shader, log_len, NULL, buffer);
+
+//         g_warning("Compile failure in %s shader:\n%s",
+//                              type == GL_VERTEX_SHADER ? "vertex" : "fragment",
+//                              buffer);
+
+//         g_free(buffer);
+
+//         glDeleteShader(shader);
+
+//         return 0;
+//      }
+
+//     return shader;
+// }
+
+/*
+ * Find the gl_area_entry size
+ *
+ * @param   void
+ *
+ * @return  size of array
+ */
+extern struct gl_area_entry **gl_area_array;
+static inline short gl_area_size(void)
+{
+    struct gl_area_entry **cur;
+    short size;
+
+//  28-9-2023 JE COMMENTE LA LIGNE SUIVANTE SANS SAVOIR CE QUE JE FAIS
+//  (J'ESSAIE D'ISOLER CE QUI CONCERNE LES SHADERS HORS DE "graphics.c")
+
+//    Check uninitialized and quit   <<<    WARNING !  TODO
+
+    if (gl_area_array == NULL) return 0;
+
+    cur = gl_area_array;
+    while(*cur) {
+        cur++;
+        size++;
+    }
+
+    return size;
+}
+
+/*** TEST ***/
+
+void main_test_graphics (void);

include/grid.h

@@ -0,0 +1,74 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  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>
+
+/*
+ *  Writes grid lines intersections to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_intersections (long x, long y, long z);
+
+/*
+ *  Writes grid ridges to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z), step_x, step_y, step_z
+ *
+ *  @return void
+ */
+void grid_write_ridges (long x, long y, long z);
+
+
+/*
+ *  Writes grid lines for x axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_x  (long x, long y, long z);
+
+/*
+ *  Writes grid lines for y axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_y  (long x, long y, long z);
+
+/*
+ *  Writes grid lines for z axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_z  (long x, long y, long z);

include/parsing.h

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

include/shaders_study.h

@@ -0,0 +1,110 @@
+/*
+ *      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 "base.h"
+#include <unistd.h>
+#include <stdbool.h>
+#include <epoxy/gl.h>
+#include <GL/glu.h>
+#include <GL/glext.h>
+
+/*
+ * 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);
+
+/*
+ * Created and compile a shader
+ *
+ * @param   type, shader type
+ *          src, source code of shader
+ *
+ * @return  shader id
+ */
+static inline GLuint create_shader(int type, const char *src)
+{
+    GLuint shader;
+    int status;
+
+    shader = glCreateShader(type);
+    glShaderSource(shader, 1, &src, NULL);
+    glCompileShader(shader);
+
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+    if(status == GL_FALSE) {
+        int log_len;
+        char *buffer;
+
+        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
+
+        buffer = g_malloc(log_len + 1);
+        assert (buffer);
+        glGetShaderInfoLog(shader, log_len, NULL, buffer);
+
+        g_warning("Compile failure in %s shader:\n%s",
+                             type == GL_VERTEX_SHADER ? "vertex" : "fragment",
+                             buffer);
+
+        g_free(buffer);
+
+        glDeleteShader(shader);
+
+        return 0;
+     }
+
+    return shader;
+}
+
+/*
+ * Find the gl_area_entry size
+ *
+ * @param   void
+ *
+ * @return  size of array
+ */
+// extern struct gl_area_entry **gl_area_array;
+// static inline short gl_area_size(void)
+// {
+//     struct gl_area_entry **cur;
+//     short size;
+
+    // Check uninitialized and quit
+//     if (gl_area_array == NULL) return 0;
+
+//     cur = gl_area_array;
+//     while(*cur) {
+//         cur++;
+//         size++;
+//     }
+
+//     return size;
+// }
+
+/*** TEST ***/
+
+// void main_test_graphics (void);

include/ui.h

@@ -0,0 +1,104 @@
+/*
+ *      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_quit_action(GSimpleAction *action,
+                    GVariant *parameter,
+                    gpointer user_data);
+
+
+static const GActionEntry app_actions[] = {
+    { "quit", on_quit_action, NULL, NULL, NULL },
+};
+
+//
+// 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"
+   )
+)

src/graphics/arrows.c

@@ -0,0 +1,166 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: OpenGL utils header
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *  Copyright (C) 2023 Arien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  aint with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/graphics.h"
+
+/* I'm standing on Earth (any planet or star or spinning spheroid, in fact)
+ * and looking towards its North pole
+ *
+ *  X - X   =   EAST   - WEST    =   rouge - cyan
+ *  Y - Y   =   ZENITH - NADIR   =   vert  - magenta
+ *  Z - Z   =   NORTH  - SOUTH   =   bleu  - jaune
+ */
+
+/*
+ *  Writes basis and tip for all arrows into vertex and color buffers
+ *
+ *  @param dimensions (x,y,z)
+ *
+ *  @return void
+ */
+void arrows_write_terminations (long x, long y, long z)
+{
+    float max, i, j, k, vx, vy, vz, arrow_basis_width, arrow_tip_padding;
+
+    max = fmax(x, y); max = fmax(max, z);
+
+    //  arrow_basis_width donne la dimension de l'étoile centrale
+    arrow_basis_width = 0.3f * (1 / max),
+
+    //  décale légèrement les pointes des flèches
+    //  pour qu'elles n'aillent pas jusqu'aux faces des cubes
+    arrow_tip_padding = 0.1 * (1 / max);
+
+    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 + (1 / max);
+                vy = (2 * j / y - 1) * y / max + (1 / max);
+                vz = (2 * k / z - 1) * z / max + (1 / max);
+
+                //  X - X  axis - central star (basis)
+                graphics_write_vertex(vx + arrow_basis_width, vy, vz);
+                graphics_write_vertex(vx - arrow_basis_width, vy, vz);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+
+                //  Y - Y  axis - central star (basis)
+                graphics_write_vertex(vx, vy + arrow_basis_width, vz);
+                graphics_write_vertex(vx, vy - arrow_basis_width, vz);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+
+                //  Z - Z  axis - central star (basis)
+                graphics_write_vertex(vx, vy, vz + arrow_basis_width);
+                graphics_write_vertex(vx, vy, vz - arrow_basis_width);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+                graphics_write_color(0.3f, 0.3f, 0.3f);
+
+                //  X - X  (EAST - WEST) axis - arrows tips
+                graphics_write_vertex (vx + (1 / max) - arrow_tip_padding, vy, vz);
+                graphics_write_vertex (vx - (1 / max) + arrow_tip_padding, vy, vz);
+                graphics_write_color(1.0f, 0.0f, 0.0f);
+                graphics_write_color(0.0f, 1.0f, 1.0f);
+
+                //  Y - Y  (ZENITH - NADIR) axis - arrows tips
+                graphics_write_vertex (vx, vy + (1 / max) - arrow_tip_padding, vz);
+                graphics_write_vertex (vx, vy - (1 / max) + arrow_tip_padding, vz);
+                graphics_write_color(0.0f, 1.0f, 0.0f);
+                graphics_write_color(1.0f, 0.0f, 1.0f);
+
+                //  Z - Z  (NORTH - SOUTH) axis - arrows tips
+                graphics_write_vertex (vx, vy, vz + (1 / max) - arrow_tip_padding);
+                graphics_write_vertex (vx, vy, vz - (1 / max) + arrow_tip_padding);
+                graphics_write_color(0.0f, 0.0f, 1.0f);
+                graphics_write_color(1.0f, 1.0f, 0.0f);
+            };
+}
+
+/*
+ *  Writes lines for arrow oriented towards east or west into lines buffer
+ *
+ *  @param offset,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_east_west (long offset, int weight, int site)
+{
+    graphics_write_line (offset + 2, offset + 6 + site % 2);
+    graphics_write_line (offset + 3, offset + 6 + site % 2);
+    graphics_write_line (offset + 4, offset + 6 + site % 2);
+    graphics_write_line (offset + 5, offset + 6 + site % 2);
+}
+
+/*
+ *  Writes lines for arrow oriented towards zenith or nadir into lines buffer
+ *
+ *  @param offset,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_zenith_nadir (long offset, int weight, int site)
+{
+    graphics_write_line (offset + 0, offset + 8 + site % 2);
+    graphics_write_line (offset + 1, offset + 8 + site % 2);
+    graphics_write_line (offset + 4, offset + 8 + site % 2);
+    graphics_write_line (offset + 5, offset + 8 + site % 2);
+}
+
+/*
+ *  Writes lines for arrow oriented towards south or north into lines buffer
+ *
+ *  @param offset,
+ *         weight,
+ *         site
+ *
+ *  @return void
+ */
+void write_arrow_lines_south_north (long offset, int weight, int site)
+{
+    graphics_write_line (offset + 0, offset + 10 + site % 2);
+    graphics_write_line (offset + 1, offset + 10 + site % 2);
+    graphics_write_line (offset + 2, offset + 10 + site % 2);
+    graphics_write_line (offset + 3, offset + 10 + site % 2);
+}
+
+/*
+ *  Writes lines for arrow basis into lines buffer
+ *
+ *  @param offset
+ *
+ *  @return void
+ */
+void arrows_write_basis(long offset)
+{
+    graphics_write_line (offset + 0, offset + 1);
+    graphics_write_line (offset + 2, offset + 3);
+    graphics_write_line (offset + 4, offset + 5);
+}
+

src/graphics/graphics.c

@@ -0,0 +1,718 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+#include "../../include/arrows.h"
+#include "../../include/grid.h"
+#include "../../include/shaders_study.h"
+
+//  #define VERTEX_SHADER_FILE "src/shaders/shader.vert"
+//  #define FRAG_SHADER_FILE "src/shaders/shader.frag"
+
+static GLfloat *buffer_vertex_origin = NULL;
+static GLfloat *buffer_colors_origin = NULL;
+static GLuint *buffer_lines_origin = NULL;
+static GLuint *buffer_plans_origin = NULL;
+
+static volatile int buffer_vertex_size = 0;
+static volatile int buffer_lines_size = 0;
+static volatile int buffer_colors_size = 0;
+static volatile int buffer_plans_size = 0;
+
+/*
+ * Dynamic array of ptrs to dynamically allocated gl_area_entry
+ */
+struct gl_area_entry **gl_area_array = NULL;
+
+/*
+ * Prints verbose human-readable debug messages
+ *
+ * @param   source, XXX
+ *          type, XXX
+ *          id, XXX
+ *          severity, XXX
+ *          length, XXX
+ *          msg, XXX
+ *          data, XXX
+ *
+ * @return  void
+ */
+static void graphics_debug_callback(GLenum source, GLenum type, GLuint id,
+                                    GLenum severity, GLsizei length,
+                                    const GLchar *msg, const void *data)
+{
+    const char *errsource;
+    const char *errtype;
+    const char *errseverity;
+    const GLubyte *string;
+    GLenum code;
+
+    switch (source) {
+    case GL_DEBUG_SOURCE_API:               errsource = "API";              break;
+    case GL_DEBUG_SOURCE_WINDOW_SYSTEM:     errsource = "WINDOW SYSTEM";    break;
+    case GL_DEBUG_SOURCE_SHADER_COMPILER:   errsource = "SHADER COMPILER";  break;
+    case GL_DEBUG_SOURCE_THIRD_PARTY:       errsource = "THIRD PARTY";      break;
+    case GL_DEBUG_SOURCE_APPLICATION:       errsource = "APPLICATION";      break;
+    case GL_DEBUG_SOURCE_OTHER:             errsource = "UNKNOWN";          break;
+    default:                                errsource = "UNKNOWN";          break;
+    }
+
+    switch (type) {
+    case GL_DEBUG_TYPE_ERROR:               errtype = "ERROR";              break;
+    case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: errtype = "DEPRECATED BEHAVIOR";break;
+    case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:  errtype = "UNDEFINED BEHAVIOR"; break;
+    case GL_DEBUG_TYPE_PORTABILITY:         errtype = "PORTABILITY";        break;
+    case GL_DEBUG_TYPE_PERFORMANCE:         errtype = "PERFORMANCE";        break;
+    case GL_DEBUG_TYPE_OTHER:               errtype = "OTHER";              break;
+    case GL_DEBUG_TYPE_MARKER:              errtype = "MARKER";             break;
+    default:                                errtype = "UNKNOWN";            break;
+    }
+
+    switch (severity) {
+    case GL_DEBUG_SEVERITY_HIGH:            errseverity = "CRITICAL";       break;
+    case GL_DEBUG_SEVERITY_MEDIUM:          errseverity = "ERROR";          break;
+    case GL_DEBUG_SEVERITY_LOW:             errseverity = "WARNING";        break;
+    case GL_DEBUG_SEVERITY_NOTIFICATION:    errseverity = "INFO";           break;
+    default:                                errseverity = "UNKNOWN";        break;
+    }
+
+    code = glGetError();
+    string = gluErrorString(code);
+
+    printf("[%s] %s (%s) from %s: %s\n",
+           errseverity, string, errtype, errsource, msg);
+}
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * void graphics_erase_line (GLuint a, GLuint b){}  TODO and to use ?
+ * As, in this version only lines can be erased,
+ * similar functions for vertex and plans are not considered. But ?...
+ */
+
+/*
+ *  Writes values to describe a line from a to b into the line buffer
+ *
+ *  @param coords GLuint (a,b)
+ *
+ *  @return void
+ */
+void graphics_write_line (GLuint a, GLuint b)
+{
+    buffer_lines_origin = g_realloc (buffer_lines_origin,
+                                    (buffer_lines_size + 2) * sizeof(GLuint));
+
+    assert (buffer_lines_origin);
+
+    buffer_lines_origin[buffer_lines_size + 0] = a;
+    buffer_lines_origin[buffer_lines_size + 1] = b;
+
+    buffer_lines_size += 2;
+}
+
+/*
+ *  Writes values to describe a vertex at (x,y,z) into the vertex buffer
+ *
+ *  @param coords GLfloat(x,y,z)
+ *
+ *  @return void
+ */
+void graphics_write_vertex (GLfloat x, GLfloat y, GLfloat z)
+{
+    buffer_vertex_origin = g_realloc (buffer_vertex_origin,
+                                     (buffer_vertex_size + 3) * sizeof(GLfloat));
+
+    assert (buffer_vertex_origin);
+
+    buffer_vertex_origin[buffer_vertex_size + 0] = x;
+    buffer_vertex_origin[buffer_vertex_size + 1] = y;
+    buffer_vertex_origin[buffer_vertex_size + 2] = z;
+
+    buffer_vertex_size += 3;
+
+    //printf("Created vertex (%f,%f,%f), size is %d\n", x,y,z, buffer_vertex_size);
+}
+
+/*
+ *  Writes values to describe a color (r,g,b) into the color buffer
+ *
+ *  @param color GLfloat(r,g,b)
+ *
+ *  @return void
+ */
+void graphics_write_color (GLfloat r, GLfloat g, GLfloat b)
+{
+    buffer_colors_origin = g_realloc (buffer_colors_origin,
+                                     (buffer_colors_size + 3) * sizeof(GLfloat));
+
+    assert (buffer_colors_origin);
+
+    buffer_colors_origin[buffer_colors_size + 0] = r;
+    buffer_colors_origin[buffer_colors_size + 1] = g;
+    buffer_colors_origin[buffer_colors_size + 2] = b;
+
+    buffer_colors_size += 3;
+}
+
+/*
+ *  Writes values to describe an (a,b,c) plan (triangle) into the plan buffer
+ *
+ *  @param coords GLuint (a,b,c)
+ *
+ *  @return void
+ */
+void graphics_write_plan (GLuint a, GLuint b, GLuint c)
+{
+    buffer_plans_origin = g_realloc (buffer_plans_origin,
+                                    (buffer_plans_size + 3) * sizeof(GLuint));
+
+    assert (buffer_plans_origin);
+
+    buffer_plans_origin[buffer_plans_size + 0] = a;
+    buffer_plans_origin[buffer_plans_size + 1] = b;
+    buffer_plans_origin[buffer_plans_size + 2] = c;
+
+    buffer_plans_size += 3;
+}
+
+/* Initializes the buffer of a gl_area
+ * Calls according to the user preferences
+ * @param   gl_area, ptr to the gl_area widget
+ * @return  void
+ */
+void graphics_init_buffers(const void *gl_area)
+{
+    struct gl_area_entry *entry;
+    entry = graphics_find_glarea_from_ptr(gl_area);
+
+    //XXX
+    main_test_graphics ();
+
+    GLuint vao, vertex_buffer, color_buffer;
+
+    glGenBuffers(1, &vertex_buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+    glBufferData(GL_ARRAY_BUFFER, buffer_vertex_size * sizeof(buffer_vertex_origin[0]), buffer_vertex_origin, GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+
+    // colors
+    glGenBuffers(1, &color_buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, color_buffer);
+    glBufferData(GL_ARRAY_BUFFER, buffer_colors_size * sizeof(buffer_colors_origin[0]), buffer_colors_origin, GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    // We only use one VAO, so we always keep it bound
+    glGenVertexArrays(1, &vao);
+    glBindVertexArray(vao);
+
+    if(entry != NULL) {
+        entry->vao = vao;
+        entry->position_buffer = vertex_buffer;
+        entry->color_buffer = color_buffer;
+    }
+}
+
+
+
+
+/* 28-9-2023  Je déplace la fonction : "bool graphics_init_shaders(const void *gl_area)"
+ *            dans un nouveau fichier "shaders_study.c" pour alléger graphics.c */
+
+
+
+
+/*
+ * 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)
+{
+    float m[16];
+    float v[16];
+    float p[16];
+    struct gl_area_entry *entry;
+
+    entry = graphics_find_glarea_from_ptr(gl_area);
+
+    if (entry == NULL) {
+        errno = EFAULT;
+        perror("gl_area_array entry not found");
+        return;
+    }
+
+    /* Compute the model view projection matrix using the
+     * rotation angles specified through the GtkRange widgets
+     */
+    compute_mvp(p,
+                rotation_angles[X_AXIS],
+                rotation_angles[Y_AXIS],
+                rotation_angles[Z_AXIS]);
+    compute_i(m);
+    compute_i(v);
+
+    /* Use our shaders */
+    glUseProgram(entry->program);
+
+//    if (pref_style_mix_colors == 0)
+        glClearColor(0, 0, 0, 0.4f);
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    /* Update the "mvp" matrix we use in the shader */
+    glUniformMatrix4fv(entry->m, 1, GL_FALSE, &m[0]);
+    glUniformMatrix4fv(entry->v, 1, GL_FALSE, &v[0]);
+    glUniformMatrix4fv(entry->p, 1, GL_FALSE, &p[0]);
+
+    /* Use the vertices in our buffer */
+    glEnableVertexAttribArray(0);
+    glBindBuffer(GL_ARRAY_BUFFER, entry->position_buffer);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
+
+    // couleurs
+    glEnableVertexAttribArray(1);
+    glBindBuffer(GL_ARRAY_BUFFER, entry->color_buffer);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
+
+    //glEnable(GL_DEPTH_TEST);
+
+    glDrawElements(GL_LINES, buffer_lines_size, GL_UNSIGNED_INT, buffer_lines_origin);
+    glDrawElements(GL_TRIANGLES, buffer_plans_size, GL_UNSIGNED_INT, buffer_plans_origin);
+
+    /* We finished using the buffers and program */
+    glDisableVertexAttribArray(0);
+    glDisableVertexAttribArray(1);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glUseProgram(0);
+
+    glFlush();
+}
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Find gl_area_entry from a gl_area ptr
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ *
+ * @return  entry ptr
+ */
+struct gl_area_entry *graphics_find_glarea_from_ptr(const char *name)
+{
+    struct gl_area_entry **cur;
+
+    // Check uninitialized and quit
+    if (gl_area_array == NULL) return NULL;
+
+    // Seek in array
+    cur = gl_area_array;
+    while(*cur) {
+        if (strncmp((*cur)->name, name, sizeof((*cur)->name)) == 0) return *cur;
+        cur++;
+    }
+
+    // Nothing found
+    return NULL;
+}
+
+/*
+ * Initializes a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if initialized
+ */
+bool graphics_init(const char *gl_area)
+{
+    short array_size;
+
+    glEnable(GL_DEBUG_OUTPUT);
+    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+    glEnable(GL_MULTISAMPLE);
+
+    // Check if not already initialized
+    if (graphics_find_glarea_from_ptr(gl_area)) {
+        errno = EEXIST;
+        perror("gl_area_array already exists");
+        return false;
+    }
+
+    // Get actual array size
+    array_size = gl_area_size();
+
+    // If it does not exist, allocs it
+    if (gl_area_array == NULL) {
+        gl_area_array = g_malloc0(sizeof(struct gl_area_entry *) * 2);
+        assert(gl_area_array);
+
+    // If it does exist, g_reallocs it
+    } else {
+        gl_area_array = g_realloc(gl_area_array,
+                                 (array_size + 1)
+                                 * sizeof(struct gl_area_entry *));
+        assert (gl_area_array);
+        if (gl_area_array == NULL) {
+            perror("Not enough memory to allocate gl_area_array");
+            return false;
+        }
+
+        explicit_bzero(gl_area_array + array_size * sizeof(struct gl_area_entry *),
+                       sizeof(struct gl_area_entry *));
+    }
+
+    // Alloc new entry
+    gl_area_array[array_size] = g_malloc0(sizeof(struct gl_area_entry));
+    assert(gl_area_array[array_size]);
+
+    strcpy(gl_area_array[array_size]->name, gl_area);
+
+    if (!graphics_init_shaders(gl_area)) return false;
+
+    graphics_init_buffers(gl_area);
+
+    glDebugMessageCallback(graphics_debug_callback, NULL);
+
+    return true;
+}
+
+/*
+ * Shutdowns a gl_area
+ *
+ * @param   gl_area, ptr to the gl_area widget
+ *
+ * @return  true if success
+ */
+bool graphics_shutdown(const void *gl_area)
+{
+    struct gl_area_entry *entry;
+
+    entry = graphics_find_glarea_from_ptr(gl_area);
+
+    if (entry == NULL) {
+        errno = EFAULT;
+        perror("gl_area_array entry not found");
+        return false;
+    }
+
+    glDeleteBuffers(1, &entry->position_buffer);
+    glDeleteBuffers(1, &entry->color_buffer);
+    glDeleteProgram(entry->program);
+
+    // Liberate
+    g_free(entry);
+
+    entry = NULL;
+
+    gl_area_array = g_realloc(gl_area_array,
+                             (gl_area_size())
+                                 * sizeof(struct gl_area_entry *));
+    assert (gl_area_array || !gl_area_size());
+
+    g_free(buffer_vertex_origin);
+    g_free(buffer_colors_origin);
+    g_free(buffer_lines_origin);
+    g_free(buffer_plans_origin);
+    return true;
+}
+
+
+/*
+ * Prints the arrows[] array
+ *
+ * For each arrow the following parameters are displayed :
+ * - rank in the array
+ * - weight (or load)
+ * - coordinates in space (site, x, y, z)
+ */
+static void show_arrows_array (GLuint *arrows, int arrows_nb, int x, int y, int z)
+{
+    printf("\n   [rank]   load | site  x    y    z");
+    for (int i = 0; i < arrows_nb; i++)
+        printf("\n   [%4d] =  %2d  | %2d,  %2d,  %2d,  %2d", i, *(arrows + i * 5 + 0),\
+               *(arrows + i * 5 + 1), *(arrows + i * 5 + 2), *(arrows + i * 5 + 3), *(arrows + i * 5 + 4));
+    if (arrows_nb == 0) printf("\n   [NULL]   ---- | ---- ---  ---  ---");
+}
+
+/*
+ * Prints the initial user choices :
+ * - space dimension size and appearance (grids)
+ * - arrows[] array
+ *   NB The space may be empty or saturated with arrows or any value in between
+ *      Only one arrow per possible coordinates with a load max equal to ? TODO
+ */
+static void show_user_choices(GLuint *arrows, int arrows_nb,
+                              int space_size_x, int space_size_y, int space_size_z,
+                              int prefer, int show_all)
+{
+    printf("model + user constraints :\tspace size x,y,z = %d,%d,%d\t", space_size_x, space_size_y, space_size_z);
+    if (prefer == 0)    printf("prefer = %d <> show all grids",  prefer);
+    if (prefer == 1)    printf("prefer = %d <> show no grid",    prefer);
+    if (prefer  > 1)    printf("show grids according rule (%d)", prefer);
+    if (show_all)       printf("\n\
+                                                   initial arrows data     arrows_nb = %d", arrows_nb);
+    show_arrows_array (arrows, arrows_nb, space_size_x, space_size_y, space_size_z);
+}
+
+/*
+ * Prints the result of the function set_arrow()
+ * and indicates the reasons of the choice (call) this function makes (see this function)
+ */
+static void show_user_action(GLuint *arrows, int arrows_nb, int address, int requested_weight,
+                             int current_weight, int site, int x, int y, int z)
+{
+    if (address == -1 && requested_weight  > 0) {printf("no such arrow found (address == -1)\n\
+                                                  requested weight == %d  =>  CREATE", requested_weight); return;}
+
+    if (address >=  0 && requested_weight == 0) {printf("arrow (%d,%d,%d,%d) found at address %d;  current_weight = %d;\n\
+                                                  requested weight == %d  =>  ERASE",\
+        arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight, requested_weight); return;}
+
+    if (address >=  0 && current_weight != requested_weight) {printf("arrow (%d,%d,%d,%d) found at address %d;  current_weight = %d;\n\
+                                                  requested weight != current weight  =>  MODIFY",\
+        arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5, current_weight); return;}
+
+    if (address >=  0 && current_weight == requested_weight){printf("arrow (%d,%d,%d,%d) found at address %d;\n\
+                                                  requested_weight == current_weight  =>  END",\
+        arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5); return;}
+
+    if (address == -1 && requested_weight == 0) {printf("no such arrow found (address == -1)\n\
+                                                  requested weight == 0  =>  END"); return;}
+}
+
+/*
+ * Prints vertex and lines buffers_states (sizes) at major steps and at the end of a session.
+ * Major steps are creation of grids and creation of arrows
+ * Arithmetic verification is provided at each step
+ */
+static void show_buffers_states(int space_X, int space_Y, int space_Z, int arrows_nb,
+                                int offset_after_grids, int buffer_vertex_size,
+                                int buffer_lines_size_after_cubes, int buffer_lines_size)
+{
+    int offset_after_arrows = buffer_vertex_size / 3, difference = offset_after_arrows - offset_after_grids;
+
+    printf("\n   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -");
+    printf("\n    buffer_vertex_offset_after grids = %6d\t%6d  = (x+1)*(y+1)*(z+1);  <-->  (x,y,z = %d,%d,%d)",\
+           offset_after_grids,  (space_X + 1)*(space_Y + 1)*(space_Z + 1), space_X, space_Y, space_Z);
+
+    printf("\n   buffer_vertex_offset_after arrows = %6d\t%6d  = %d + %d;  <-->  %d = 12 x %d  (there are %d cubes)",\
+           offset_after_arrows, offset_after_arrows, offset_after_grids,\
+                  difference, difference, difference / 12, difference / 12);
+
+    printf("\n     buffer_lines_offset after cubes = %6d\t%6d  = 2 * (%dx%d + %dx%d + %dx%d);  <-->  2 * (x*y + x*z + y*z)",\
+           buffer_lines_size_after_cubes, ((space_X+1) * (space_Y+1) + (space_X+1) * (space_Z+1) + (space_Y+1) * (space_Z+1)) * 2,
+           space_X+1, space_Y+1, space_X+1, space_Z+1, space_Y+1, space_Z+1);
+
+    printf("\n    buffer_lines_offset after arrows = %6d\t%6d  = %d + %d;  <-->  %d = (3 + 4) x 2 x %d  (arrows_nb = %d)\n",\
+           buffer_lines_size, buffer_lines_size, buffer_lines_size_after_cubes,\
+           buffer_lines_size - buffer_lines_size_after_cubes, arrows_nb * 14, arrows_nb, arrows_nb);
+}
+
+
+
+/*
+ * Assigns a new weight to the arrow at address (address)
+*/
+static int rewrite_arrow (GLuint *arrows, int arrows_nb, int address, int weight, int site, int x, int y, int z)
+{
+    *(arrows + address * 5 + 0) = weight;
+
+    show_arrows_array (arrows, arrows_nb, x, y, z);
+
+    return arrows_nb;
+}
+
+/*
+ * Creates a new arrow at address (address)
+ * NB  Weights (or loads) are NOT added
+*/
+static int create_arrow (GLuint *arrows, int arrows_nb, int weight, int site, int x, int y, int z)
+{
+//    buffer_lines_size += 14;
+
+    buffer_lines_origin = g_realloc(buffer_lines_origin, buffer_lines_size * 2 * sizeof(GLuint));
+
+    assert (buffer_lines_origin); assert (buffer_lines_size);
+
+    *(arrows + arrows_nb * 5 + 0) = weight;
+    *(arrows + arrows_nb * 5 + 1) = site;
+    *(arrows + arrows_nb * 5 + 2) = x;
+    *(arrows + arrows_nb * 5 + 3) = y;
+    *(arrows + arrows_nb * 5 + 4) = z;
+
+    arrows_nb ++;
+
+    show_arrows_array (arrows, arrows_nb, x, y, z);
+
+    return arrows_nb;
+}
+
+/*
+ * Removes an arrow at address (address)
+*/
+static int erase_arrow (GLuint *arrows, int arrows_nb, int address, int site, int x, int y, int z)
+{
+    arrows_nb --;
+
+    if (arrows_nb > 0)
+    {
+        *(arrows + address + 0) = *(arrows + arrows_nb * 5 + 0);
+        *(arrows + address + 1) = *(arrows + arrows_nb * 5 + 1);
+        *(arrows + address + 2) = *(arrows + arrows_nb * 5 + 2);
+        *(arrows + address + 3) = *(arrows + arrows_nb * 5 + 3);
+        *(arrows + address + 4) = *(arrows + arrows_nb * 5 + 4);
+    }
+
+    buffer_lines_origin = g_realloc(buffer_lines_origin, buffer_lines_size * sizeof(GLuint));
+
+    show_arrows_array (arrows, arrows_nb, x, y, z);
+
+    return arrows_nb;
+}
+
+/*
+ * Calls one of the functions create_arrow(), erase_arrow() or rewrite_arrow()
+ * according to requested weight and address (coord site, x, y, z)
+ *
+ * May not call any of these three functions if :
+ * - Current_weight of an arrow located at the requested address == requested_weight
+ * - No arrow was found at the requested addres AND current_weight == requested_weight
+ */
+static int set_arrow (GLuint *arrows, int arrows_nb, int requested_weight, int site, int x, int y, int z)
+{
+    int address = -1, current_weight = -1;
+
+    for (int i = 0; i < arrows_nb; i++) {
+        if ((site == *(arrows + i * 5 + 1))
+        &&  (x    == *(arrows + i * 5 + 2))
+        &&  (y    == *(arrows + i * 5 + 3))
+        &&  (z    == *(arrows + i * 5 + 4)))
+        {
+            address = i * 5;
+            current_weight = *(arrows + i * 5 + 0);
+            break;
+        }
+    }
+
+    printf("\nset_arrow() invoked with requested weight = %d  >  ", requested_weight);
+
+    show_user_action(arrows, arrows_nb, address, requested_weight, current_weight, site, x, y, z);
+
+    if (address == -1 && requested_weight  > 0)
+        return create_arrow  (arrows, arrows_nb, requested_weight, site, x, y, z);
+
+    if (address >=  0 && requested_weight == 0)
+        return erase_arrow   (arrows, arrows_nb, address, site, x, y, z);
+
+    if (address >=  0 && current_weight != requested_weight)
+        return rewrite_arrow (arrows, arrows_nb, address/5, requested_weight, site, x, y, z);
+
+    if (address >=  0 && current_weight == requested_weight)  show_arrows_array(arrows, arrows_nb, x, y, z);
+
+    if (address == -1 && requested_weight == 0) show_arrows_array(arrows, arrows_nb, x, y, z);
+
+    return arrows_nb;
+}
+
+
+
+/*
+ * Init space and arrows (= initial state)
+ * and allows ulterior creations, suppressions or modifications of the arrows[] array
+ *
+ * Draws space and arrows
+ */
+void main_test_graphics (void)
+{
+//  assert : space dimensions (x,y,z) > 0                 TODO   NOT checked before init
+//  assert : arrows localization within space and sites   TODO   NOT checked when invoking set_arrow()
+//  assert : no more than one arrow per address           TODO   NOT checked before init
+//  notify : weights are replaced, NOT added (could be !) TODO
+
+    int space_X = 3,    space_Y = 3,     space_Z = 3;
+    int pref_show_grids = 0;    //  0,   1,   2, 3, 5,   6, 10, 15,   30,   etc
+                                // xyz,  0,   x, y, z,  xy, xz, yz,  xyz
+    GLuint arrows[] = {
+          1,    0,    0, 0, 0,
+          1,    1,    1, 0, 0,
+          1,    2,    2, 0, 0,
+          1,    3,    0, 2, 0,
+    //  load, site,   x, y, z
+    };
+    int arrows_nb = sizeof(arrows) / sizeof(arrows[0]) / 5;
+    show_user_choices(arrows, arrows_nb, space_X, space_Y, space_Z, pref_show_grids, 1);
+    /* GRID */
+    grid_write_intersections (space_X, space_Y, space_Z);
+    if (pref_show_grids % 2 == 0) grid_write_x (space_X, space_Y, space_Z);
+    if (pref_show_grids % 3 == 0) grid_write_y (space_X, space_Y, space_Z);
+    if (pref_show_grids % 5 == 0) grid_write_z (space_X, space_Y, space_Z);
+    if (pref_show_grids > 0) grid_write_ridges (space_X, space_Y, space_Z);
+    int offset_after_grids = buffer_vertex_size / 3;
+    int buffer_lines_size_after_cubes = buffer_lines_size;
+    int offset_up_to_this_cube_coords = 0, x, y, z;
+    /* ARROWS */
+    /*   NB      The 12 vertices required to draw 6 arrows in each cube
+     *           are always defined (whether arrows are drawn or not). */
+    arrows_write_terminations (space_X, space_Y, space_Z);
+
+    arrows_nb = set_arrow (arrows, arrows_nb, 0, 0, 2, 0, 0);
+    arrows_nb = set_arrow (arrows, arrows_nb, 0, 1, 1, 0, 0);
+    arrows_nb = set_arrow (arrows, arrows_nb, 0, 1, 3, 0, 0);
+    arrows_nb = set_arrow (arrows, arrows_nb, 1, 1, 2, 2, 0);
+    arrows_nb = set_arrow (arrows, arrows_nb, 1, 3, 0, 2, 0);
+
+    int weight = 0, site = 0,
+        stx = space_Z * space_Y, sty = space_Z, stz = 1, arrow_offset = 0;
+
+    for (int i = 0; i < arrows_nb; i++) {
+        weight = arrows[i * 5 + 0];
+        site   = arrows[i * 5 + 1];
+        x      = arrows[i * 5 + 2];
+        y      = arrows[i * 5 + 3];
+        z      = arrows[i * 5 + 4];
+
+        offset_up_to_this_cube_coords = 12 * (stx * x + sty * y + stz * z);
+        arrow_offset = offset_after_grids + offset_up_to_this_cube_coords;
+
+        arrows_write_basis (arrow_offset);
+
+        switch(site){
+        case EAST:   case WEST:   write_arrow_lines_east_west    (arrow_offset, weight, site); break;
+        case ZENITH: case NADIR:  write_arrow_lines_zenith_nadir (arrow_offset, weight, site); break;
+        case SOUTH:  case NORTH:  write_arrow_lines_south_north  (arrow_offset, weight, site); break;
+        default: break;
+        }
+    }
+
+    show_buffers_states(space_X, space_Y, space_Z, arrows_nb,
+                        offset_after_grids, buffer_vertex_size,
+                        buffer_lines_size_after_cubes, buffer_lines_size);
+}
+

src/graphics/grid.c

@@ -0,0 +1,157 @@
+/*
+ *      Gem-graph
+ *
+ *      Desc: OpenGL grid functions
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  aint with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/graphics.h"
+
+/*
+ *  Writes grid lines intersections to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_intersections (long x, long y, long z)
+{
+
+    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;
+
+                graphics_write_vertex (vx, vy, vz);
+                graphics_write_color (0.64f,0.64f,0.64f);
+            };
+}
+
+/*
+ *  Writes grid ridges to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z), step_x, step_y, step_z
+ *
+ *  @return void
+ */
+void grid_write_ridges (long x,
+                        long y,
+                        long z)
+{
+    long step_x = (z + 1) * (y + 1),
+         step_y = z + 1,
+         step_z = 1;
+    long r_000 = step_z * 0 + step_y * 0 + step_x * 0,
+         r_100 = step_z * 0 + step_y * 0 + step_x * x,
+         r_010 = step_z * 0 + step_y * y + step_x * 0,
+         r_001 = step_z * z + step_y * 0 + step_x * 0,
+         r_011 = step_z * z + step_y * y + step_x * 0,
+         r_101 = step_z * z + step_y * 0 + step_x * x,
+         r_110 = step_z * 0 + step_y * y + step_x * x,
+         r_111 = step_z * z + step_y * y + step_x * x;
+
+    graphics_write_line (r_000, r_100);    graphics_write_line (r_111, r_011);
+    graphics_write_line (r_000, r_010);    graphics_write_line (r_111, r_101);
+    graphics_write_line (r_000, r_001);    graphics_write_line (r_111, r_110);
+    graphics_write_line (r_100, r_110);    graphics_write_line (r_011, r_001);
+    graphics_write_line (r_100, r_101);    graphics_write_line (r_011, r_010);
+    graphics_write_line (r_010, r_110);    graphics_write_line (r_101, r_001);
+}
+
+/*
+ *  Writes grid lines for x axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_x  (long x, long y, long z)
+{
+    long step_z = 1,
+         step_y =  z + 1,
+         step_x = (z + 1) * (y + 1);
+
+    x ++; y ++; z ++;
+    float calcul = 0;
+
+    for (int u = 0; u < y; u ++){
+        for (int w = 0; w < x; w ++){
+            calcul = step_x * w + step_y * u;
+            graphics_write_line (calcul, calcul + step_y - step_z);
+        }
+    }
+}
+
+/*
+ *  Writes grid lines for y axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_y  (long x, long y, long z)
+{
+    long step_z = 1,
+         step_y =  z + 1,
+         step_x = (z + 1) * (y + 1);
+
+    x ++; y ++; z ++;
+    float calcul = 0;
+
+    for (int u = 0; u < z; u++) {
+        for (int w = 0; w < x; w ++){
+            calcul = step_x * w + step_z * u;
+            graphics_write_line (calcul, calcul + step_x - step_y);
+        }
+    }
+}
+
+/*
+ *  Writes grid lines for z axis to vertex and color buffers
+ *
+ *  @param  coords long (x,y,z)
+ *
+ *  @return void
+ */
+void grid_write_z  (long x, long y, long z)
+{
+    long step_z = 1,
+         step_y =  z + 1,
+         step_x = (z + 1) * (y + 1);
+
+    x ++; y ++; z ++;
+    float calcul = 0;
+
+    for (int u = 0; u < z; u ++){
+        for (int w = 0; w < y; w ++){
+            calcul = step_y * w + step_z * u;
+            graphics_write_line (calcul, calcul + step_x * (x - 1));
+        }
+    }
+}
+
+

src/graphics/shaders_study.c

@@ -0,0 +1,157 @@
+/*
+ *      Gem-graph OpenGL experiments
+ *
+ *      Desc: GL functions
+ *
+ *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
+ *
+ *  This file is part of Gem-graph.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../include/base.h"
+#include "../../include/ui.h"
+#include "../../include/graphics.h"
+#include "../../include/shaders_study.h"
+#include "../../include/arrows.h"
+#include "../../include/grid.h"
+
+#define VERTEX_SHADER_FILE "src/shaders/shader.vert"
+#define FRAG_SHADER_FILE "src/shaders/shader.frag"
+
+
+//  Que fait l'instruction suivante (ligne 397 de graphics.c)
+//     dans  "bool graphics_init(const char *gl_area)" ?
+//
+//    if (!graphics_init_shaders(gl_area)) return false;
+//
+//  Et comment et pourquoi cette structure "gl_area_array" ?
+// (Dynamic array of ptrs to dynamically allocated gl_area_entry)
+//
+//      struct gl_area_entry **gl_area_array = NULL;
+
+
+
+/*
+ * 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)
+{
+    char *vertex_shader;
+    char *fragment_shader;
+    struct gl_area_entry *entry;
+    int status;
+    GLuint vertex, fragment;
+    GLuint program = 0;
+    GLuint m = 0;
+    GLuint v = 0;
+    GLuint p = 0;
+
+    entry = graphics_find_glarea_from_ptr(gl_area);
+
+    if (entry == NULL) {
+        errno = EFAULT;
+        perror("gl_area_array entry not found");
+        return false;
+    }
+
+    // Load vertex shader file
+    vertex_shader = read_file(VERTEX_SHADER_FILE);
+    if (vertex_shader == NULL)
+        return false;
+    vertex = create_shader(GL_VERTEX_SHADER, vertex_shader);
+
+//  !  WARNING  !  l'instruction suivante (ou un autre 'free') a pu provoquer un 'double free' (Abandon)
+    if(vertex == 0) {
+        entry->program = 0;
+        g_free(vertex_shader);
+        return false;
+    }
+
+    // Load fragment shader file
+    fragment_shader = read_file(FRAG_SHADER_FILE);
+    if (fragment_shader == NULL)
+        return false;
+    fragment = create_shader(GL_FRAGMENT_SHADER, fragment_shader);
+
+    if(fragment == 0) {
+        glDeleteShader(vertex);
+        entry->program = 0;
+        g_free(vertex_shader);
+        g_free(fragment_shader);
+        return false;
+    }
+
+    // Link shaders to program
+    program = glCreateProgram();
+    glAttachShader(program, vertex);
+    glAttachShader(program, fragment);
+
+    glLinkProgram(program);
+
+    glGetProgramiv(program, GL_LINK_STATUS, &status);
+
+    if(status == GL_FALSE) {
+        int log_len;
+        char *buffer;
+
+        glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len);
+
+        buffer = g_malloc(log_len + 1);
+        assert(buffer);
+        glGetProgramInfoLog(program, log_len, NULL, buffer);
+
+        g_warning("Linking failure:\n%s", buffer);
+
+        g_free(buffer);
+
+        glDeleteProgram(program);
+        program = 0;
+
+        glDeleteShader(vertex);
+        glDeleteShader(fragment);
+
+        g_free(vertex_shader);
+        g_free(fragment_shader);
+
+        return false;
+    }
+
+    /* Get the location of the "mvp" uniform */
+    m = glGetUniformLocation(program, "model_matrix");
+    v = glGetUniformLocation(program, "view_matrix");
+    p = glGetUniformLocation(program, "projection_matrix");
+
+    glDetachShader(program, vertex);
+    glDetachShader(program, fragment);
+
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+
+    entry->program = program;
+    entry->m = m;
+    entry->v = v;
+    entry->p = p;
+
+    g_free(vertex_shader);
+    g_free(fragment_shader);
+
+    return true;
+}
+

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

src/ui/application.c

@@ -0,0 +1,99 @@
+/*
+ *      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;
+
+/* -------------------------------------------------------------------------- */
+/*
+ *  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);
+
+    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 });
+
+    application = self;
+}
+
+/* -------------------------------------------------------------------------- */
+
+static void gem_graph_client_application_class_init(
+                                        GemGraphClientApplicationClass *klass)
+{
+    GApplicationClass *app_class = G_APPLICATION_CLASS(klass);
+
+    app_class->activate = gem_graph_client_application_activate;
+}
+
+GemGraphClientApplication *gem_graph_client_application_new(
+                                                    const char *application_id,
+                                                    GApplicationFlags flags)
+{
+    g_return_val_if_fail(application_id != NULL, NULL);
+
+    return g_object_new(GEM_GRAPH_CLIENT_TYPE_APPLICATION,
+                       "application-id", application_id,
+                       "flags", flags,
+                       NULL);
+}

src/ui/bac_a_sable.ui

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

src/ui/events.c

@@ -0,0 +1,115 @@
+/*
+ *      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"
+
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * 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) {
+        printf("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))) {
+        printf("Failed to allocate GLArea !");
+    }
+}
+
+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_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;
+}
+
+/* -------------------------------------------------------------------------- */

src/ui/window.c

@@ -0,0 +1,169 @@
+/*
+ *      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;
+    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/bac_a_sable.ui", &contents, &len, &err) == FALSE)
+        g_error("error reading bac_a_sable.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,
+                                       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;
+
+    // Setup GLArea
+    ui_setup_glarea(window->run_glarea, window->run_controls);
+}
+
+/* -------------------------------------------------------------------------- */
+
+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);
+}