diff --git a/Makefile b/Makefile
index 3a9f4d4..668b4af 100644
--- a/Makefile
+++ b/Makefile
@@ -6,8 +6,8 @@ CPUS ?= $(shell (nproc --all || sysctl -n hw.ncpu) 2>/dev/null || echo 1)
 MAKEFLAGS += --jobs=$(CPUS)
 
 CC=gcc
-CFLAGS=`pkg-config --cflags gtk4 gl glib-2.0 libxml-2.0`
-LDFLAGS=`pkg-config --libs gtk4 gl glib-2.0 libxml-2.0` -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
+CFLAGS=`pkg-config --cflags gtk4 epoxy glib-2.0 libxml-2.0`
+LDFLAGS=`pkg-config --libs gtk4 epoxy glib-2.0 libxml-2.0` -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
 WARNINGS = -Wall
 DEBUG = -ggdb -fno-omit-frame-pointer #-fdiagnostics-color=always -fsanitize=bounds -fstack-check
 OPTIMIZE = -O3
diff --git a/manifest.scm b/manifest.scm
index 0e742e5..e38e0ea 100644
--- a/manifest.scm
+++ b/manifest.scm
@@ -17,7 +17,6 @@
       "libxml2"
       "glu"
       "glew"
-;;      "glfw"
       "cglm"
       "libepoxy"
       "pango@1.90.0"
@@ -25,6 +24,7 @@
       "glib"
       "mesa-headers"
       "mesa"
+      "mesa-utils"
       "libadwaita"
    )
 )
diff --git a/src/util/draw/gl.c b/src/util/draw/gl.c
index 5e8decd..88ee2a0 100644
--- a/src/util/draw/gl.c
+++ b/src/util/draw/gl.c
@@ -27,7 +27,7 @@
 #include "../../../include/graphics.h"
 #include "../../../include/signal.h"
 
-#define GL_AREA_1000 1000
+#define GL_AREA_SIZE 400
 
 struct stack_index_t {
     long stack_id;
@@ -101,18 +101,18 @@ long util_gl_is_ready(void *container_widget)
  */
 bool util_gl_init_stack(void *container_widget, GError *error_buffer)
 {
-    g_printerr("[debug] util_gl_init_util_gl_stack()\n");
+    g_message("[debug] util_gl_init_util_gl_stack()\n");
 
-    g_printerr("[debug] util_gl_init_util_gl_stack() : target is %p\n", container_widget);
+    g_message("[debug] util_gl_init_util_gl_stack() : target is %p\n", container_widget);
 
     // look for stack_index entry
     for (int i = 0; i < stack_index_size; i++) {
-        g_printerr("[debug]     util_gl_init_util_gl_stack() : i is %d\n", i);
-        g_printerr("[debug]     util_gl_init_util_gl_stack() : target would be %p\n",
+        g_message("[debug]     util_gl_init_util_gl_stack() : i is %d\n", i);
+        g_message("[debug]     util_gl_init_util_gl_stack() : target would be %p\n",
                    stack_index[i].container_widget);
         if (stack_index[i].container_widget == (void *)container_widget) {
            stack_index[i].stack_id = graphics_init(&error_buffer);
-            g_printerr("[debug] util_gl_init_util_gl_stack() : stack_id is %ld\n",
+            g_message("[debug] util_gl_init_util_gl_stack() : stack_id is %ld\n",
                        stack_index[i].stack_id);
             if (stack_index[i].stack_id >= 0)
                 return true;
@@ -273,11 +273,11 @@ GtkWidget *create_axis_slider(int axis)
 /* { */
 /*     GtkWidget *gl_area; */
 
-/*     g_printerr("[debug] util_gl_setup_glarea()\n"); */
+/*     g_message("[debug] util_gl_setup_glarea()\n"); */
 
 /*     assert(target_widget); */
 
-/*     g_printerr("[debug] util_gl_setup_glarea() : target is %p\n", target_widget); */
+/*     g_message("[debug] util_gl_setup_glarea() : target is %p\n", target_widget); */
 
 /*     if (stack_index == NULL) { */
 /*         stack_index = g_malloc(sizeof(struct stack_index_t)); */
@@ -315,9 +315,9 @@ GtkWidget *create_axis_slider(int axis)
 
 /*     stack_index[stack_index_size-1].gl_area = (void*)gl_area; */
 
-/*     g_printerr("[debug] util_gl_setup_glarea() : set target to %p\n", target_widget); */
+/*     g_message("[debug] util_gl_setup_glarea() : set target to %p\n", target_widget); */
 
-/*     g_printerr("[debug] util_gl_setup_glarea() : stack_index (@0x%p) had %ld elements\n", */
+/*     g_message("[debug] util_gl_setup_glarea() : stack_index (@0x%p) had %ld elements\n", */
 /*                stack_index, */
 /*                stack_index_size); */
 
@@ -332,31 +332,52 @@ GtkWidget *create_axis_slider(int axis)
 /* } */
 
 static void
-on_realize_debug (GtkGLArea *area) {
-    // Initialisation du contexte OpenGL
+on_realize_debug (GtkGLArea *area)
+{
     gdk_gl_context_make_current(gtk_gl_area_get_context(area));
-
-    // Si nécessaire, ajouter d'autres initialisations OpenGL ici
+    if (gtk_gl_area_get_error(area) != NULL) {
+        g_message("Failed to create OpenGL context");
+    }
+    gtk_gl_area_set_has_depth_buffer(GTK_GL_AREA(area), TRUE);
 }
 
 static gboolean
-on_render_debug (GtkGLArea *area, GdkGLContext *context) {
-    // Ici vous pouvez dessiner avec OpenGL
-    glClearColor(0.0, 1.0, 0.0, 1.0); // Effacer en vert
+on_render_debug (GtkGLArea *area, GdkGLContext *context)
+{
+    GLenum err;
+    while ((err = glGetError()) != GL_NO_ERROR) {
+        g_warning("OpenGL error: %d", err);
+    }
+
+    int width, height;
+    width = gtk_widget_get_allocated_width(GTK_WIDGET(area));
+    height = gtk_widget_get_allocated_height(GTK_WIDGET(area));
+    g_message("GtkGLArea size: %d x %d", width, height);
+
+    glViewport(0, 0, width, height);
+    glClearColor(1.0, 0.0, 0.0, 1.0);
     glClear(GL_COLOR_BUFFER_BIT);
 
     return TRUE;
 }
 
-bool util_gl_setup_glarea(int target_mode, GtkWidget *target_widget) {
+bool util_gl_setup_glarea (int target_mode, GtkWidget *target_widget)
+{
+    g_message("[debug] util_gl_setup_glarea()\n");
     GtkWidget *gl_area = gtk_gl_area_new();
 
     g_signal_connect(gl_area, "realize", G_CALLBACK(on_realize_debug), NULL);
     g_signal_connect(gl_area, "render", G_CALLBACK(on_render_debug), NULL);
 
-    gtk_box_append(GTK_BOX(target_widget), gl_area);
+    gtk_widget_set_size_request(gl_area, GL_AREA_SIZE, GL_AREA_SIZE);
+    gtk_gl_area_set_auto_render(GTK_GL_AREA(gl_area), true);
+    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_show(gl_area);
+    gtk_box_append (GTK_BOX (target_widget), gl_area);
+    gtk_widget_set_visible (GTK_WIDGET (gl_area), TRUE);
 
     return TRUE;
 }