opengl et gtk ?

bonjour,

j'ai vu qu'il éxistait un widget en gtk+ qui permettait de faire de l'opengl mais je n'ai trouvé aucun exemple, ai-je loupé un lien ?

Je programme sous linux et je me demande également si ce code gtk+opengl serait portable sous windows.

J'ai réussi à faire marcher gtkglext mais :

j'ai ce code mais ma sphère n'est pas affichée, je n'ai fait que mettre une structure à la place de variables globales par rapport à la demo :

Code:

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/* Compile with  * gcc `pkg-config --cflags --libs gtk+-2.0 gtkglext-1.0` -o sph sph0.c  */   #include <stdlib.h> #include <gtk/gtk.h> #include <gdk/gdkgl.h> #include <GL/gl.h> #include <GL/glu.h>   typedef struct _config { GdkGLConfig *glconfig; GdkGLWindow *glwindow; GdkGLContext *glcontext; int config_attributes[11]; int nb_argt; }config;   typedef struct _fenetre { config *conf; GtkWidget *win; GtkWidget *zone_gl; }fenetre;   static void realize(GtkWidget *widget,gpointer data) { fenetre *f=(fenetre *)data; GLUquadricObj *qobj; static GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0}; static GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};   /* Create GdkGLWindow for widget->window. */ f->conf->glwindow=gdk_gl_window_new(f->conf->glconfig,widget->window,NULL);   /* Set a background of "None" on window to avoid AIX X server crash */ gdk_window_set_back_pixmap(widget->window, NULL, FALSE);   /* Create OpenGL rendering context. */ if (f->conf->glcontext==NULL) { f->conf->glcontext=gdk_gl_context_new(GDK_GL_DRAWABLE(f->conf->glwindow),NULL,TRUE,GDK_GL_RGBA_TYPE); if (f->conf->glcontext == NULL) { g_print ("Erreur pdt la création du contexte OpenGL\n"); exit (1); } }   /*** OpenGL BEGIN ***/   if (!gdk_gl_drawable_gl_begin(GDK_GL_DRAWABLE(f->conf->glwindow),f->conf->glcontext)) return;   glEnable (GL_DEPTH_TEST); glEnable (GL_LIGHTING); glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv (GL_LIGHT0, GL_POSITION, light_position); glEnable (GL_LIGHT0);   qobj=gluNewQuadric(); gluQuadricDrawStyle(qobj,GLU_FILL); glNewList (1, GL_COMPILE); gluSphere(qobj, 1.0, 20, 20); glEndList();   glClearColor(1.0, 1.0, 1.0, 1.0); glClearDepth(1.0);   glViewport(0, 0,widget->allocation.width, widget->allocation.height);   glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40.0, 1.0, 1.0, 10.0);   glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 3.0,0.0, 0.0, 0.0,0.0, 1.0, 0.0); glTranslatef(0.0, 0.0, -3.0);   gdk_gl_drawable_gl_end(GDK_GL_DRAWABLE(f->conf->glwindow)); /*** OpenGL END ***/ }   static gboolean expose_event (GtkWidget *widget,GdkEventExpose *event,gpointer data) { fenetre *f=(fenetre *)data;   /*** OpenGL BEGIN ***/ if (!gdk_gl_drawable_gl_begin(GDK_GL_DRAWABLE(f->conf->glwindow),f->conf->glcontext)) return FALSE;   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   glCallList(1);   if (gdk_gl_drawable_is_double_buffered (GDK_GL_DRAWABLE(f->conf->glwindow))) gdk_gl_drawable_swap_buffers (GDK_GL_DRAWABLE(f->conf->glwindow)); else glFlush ();   gdk_gl_drawable_gl_end(GDK_GL_DRAWABLE(f->conf->glwindow));   /*** OpenGL END ***/   return TRUE; }   static void size_allocate (GtkWidget *widget,GtkAllocation *allocation,gpointer data) { fenetre *f=(fenetre *)data;   /* Synchronize OpenGL rendering pipeline on resizing X window. */ if (f->conf->glwindow != NULL) gdk_gl_drawable_wait_gdk(GDK_GL_DRAWABLE(f->conf->glwindow)); }   /* gtk_drawing_area sends configure_event when it is realized. */ static gboolean configure_event (GtkWidget *widget,GdkEventConfigure *event,gpointer data) { fenetre *f=(fenetre *)data;   if (f->conf->glwindow==NULL) return FALSE;   /*** OpenGL BEGIN ***/   if (!gdk_gl_drawable_gl_begin(GDK_GL_DRAWABLE(f->conf->glwindow),f->conf->glcontext)) return FALSE;   glViewport(0, 0,widget->allocation.width, widget->allocation.height);   gdk_gl_drawable_gl_end(GDK_GL_DRAWABLE(f->conf->glwindow));   /*** OpenGL END ***/   return TRUE; }   static void unrealize (GtkWidget *widget,gpointer data) { fenetre *f=(fenetre *)data;   if (f->conf->glcontext != NULL) { g_object_unref (G_OBJECT(f->conf->glcontext)); f->conf->glcontext = NULL; }   if (f->conf->glwindow != NULL) { g_object_unref (G_OBJECT(f->conf->glwindow)); f->conf->glwindow = NULL; }   if (f->conf->glconfig != NULL) { g_object_unref(G_OBJECT(f->conf->glconfig)); f->conf->glconfig=NULL; } }   void creation_fenetre(fenetre *f) { GtkWidget *vbox, *bouton;   /* Fenetre principale, on param les couleurs (colormap) de la fenetre openGL et mise à jour des enfant */ f->win = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (f->win), "low-level"); gtk_widget_set_colormap(f->win,gdk_gl_config_get_colormap(f->conf->glconfig)); gtk_container_set_reallocate_redraws(GTK_CONTAINER(f->win),TRUE); g_signal_connect(G_OBJECT(f->win),"delete_event",G_CALLBACK (gtk_main_quit), NULL);   /* vbox pour remplir la fenêtre */ vbox = gtk_vbox_new (FALSE, 0); gtk_container_add(GTK_CONTAINER(f->win),vbox);   /* drawing-area (OpenGL) */ f->zone_gl= gtk_drawing_area_new (); gtk_widget_set_size_request(f->zone_gl, 200, 200); gtk_widget_set_colormap (f->zone_gl,gdk_gl_config_get_colormap (f->conf->glconfig)); gtk_widget_set_double_buffered(f->zone_gl,TRUE); gtk_box_pack_start (GTK_BOX(vbox),f->zone_gl, TRUE, TRUE, 0); g_signal_connect_after(G_OBJECT(f->zone_gl),"realize",G_CALLBACK(realize), f); g_signal_connect(G_OBJECT(f->zone_gl),"expose_event",G_CALLBACK(expose_event), f); g_signal_connect(G_OBJECT(f->zone_gl),"size_allocate",G_CALLBACK(size_allocate), f); g_signal_connect(G_OBJECT(f->zone_gl),"configure_event",G_CALLBACK(configure_event), f); g_signal_connect(G_OBJECT(f->zone_gl),"unrealize",G_CALLBACK(unrealize), f);   bouton=gtk_button_new_with_label("Quitter"); gtk_box_pack_start (GTK_BOX(vbox),bouton, TRUE, TRUE, 0); g_signal_connect(GTK_OBJECT(bouton),"clicked",G_CALLBACK(gtk_main_quit),NULL);   /* Affichage de la fenêtre */ gtk_widget_show_all(f->win); }   void init_var(config *c, fenetre *f) { int i; int gdk_gl_conf[]={GDK_GL_DOUBLEBUFFER,GDK_GL_RGBA,GDK_GL_RED_SIZE,1, GDK_GL_GREEN_SIZE,1,GDK_GL_BLUE_SIZE,1,GDK_GL_DEPTH_SIZE,12,GDK_GL_ATTRIB_LIST_NONE};   c->nb_argt=11; for(i=0;i<c->nb_argt;i++) c->config_attributes[i]=gdk_gl_conf[i]; c->glconfig=NULL; c->glwindow=NULL; c->glcontext=NULL; f->conf=c; }   int main(int argc,char **argv) { fenetre f; config c; GtkWidget *vbox, *bouton;   /* Initialisation */ init_var(&c,&f);   /* Init GTK et GdkGLExt */ gtk_init (&argc, &argv); gdk_gl_init (&argc, &argv);   /* Try double-buffered visual */ c.glconfig=gdk_gl_config_new(&(c.config_attributes[0])); if (c.glconfig==NULL) { g_print ("Pas de dble buffer\n"); /* Try single-buffered visual */ c.glconfig=gdk_gl_config_new (&(c.config_attributes[1])); if (c.glconfig==NULL) { g_print ("Pas d'openGL\n"); exit (1); } }   /* création de la fentre+zone_OpenGL+interface */ creation_fenetre(&f);   /* Destroy the GLX context explicitly when application is terminated. */ gtk_quit_add_destroy(gtk_main_level()+1,GTK_OBJECT(f.zone_gl));   gtk_main ();   return 0; }

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le code original est :

Code:

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/*  * low-level.c:  * Low-level GdkGLExt example. This program uses only gdkgl stuff.  *  * written by Naofumi Yasufuku <naofumi@users.sourceforge.net>  */   #include <stdlib.h>   #include <gtk/gtk.h>   #include <gdk/gdkgl.h>   #ifdef G_OS_WIN32 #define WIN32_LEAN_AND_MEAN 1 #include <windows.h> #endif   #include <GL/gl.h> #include <GL/glu.h>   static GdkGLConfig *glconfig = NULL; static GdkGLWindow *glwindow = NULL; static GdkGLContext *glcontext = NULL;   static const int config_attributes[] = { GDK_GL_DOUBLEBUFFER, GDK_GL_RGBA, GDK_GL_RED_SIZE, 1, GDK_GL_GREEN_SIZE, 1, GDK_GL_BLUE_SIZE, 1, GDK_GL_DEPTH_SIZE, 12, GDK_GL_ATTRIB_LIST_NONE };   static void realize (GtkWidget *widget, gpointer data) { GLUquadricObj *qobj; static GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0}; static GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};   /*   * Create GdkGLWindow for widget->window.   */   glwindow = gdk_gl_window_new (glconfig, widget->window, NULL);   /* Set a background of "None" on window to avoid AIX X server crash */ gdk_window_set_back_pixmap (widget->window, NULL, FALSE);   /*   * Create OpenGL rendering context.   */   if (glcontext == NULL) { glcontext = gdk_gl_context_new (GDK_GL_DRAWABLE (glwindow), NULL, TRUE, GDK_GL_RGBA_TYPE); if (glcontext == NULL) { g_print ("Connot create the OpenGL rendering context\n"); exit (1); }   g_print ("The OpenGL rendering context is created\n"); }   /*** OpenGL BEGIN ***/   if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext)) return;   qobj = gluNewQuadric (); gluQuadricDrawStyle (qobj, GLU_FILL); glNewList (1, GL_COMPILE); gluSphere (qobj, 1.0, 20, 20); glEndList ();   glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv (GL_LIGHT0, GL_POSITION, light_position); glEnable (GL_LIGHTING); glEnable (GL_LIGHT0); glEnable (GL_DEPTH_TEST);   glClearColor (1.0, 1.0, 1.0, 1.0); glClearDepth (1.0);   glViewport (0, 0, widget->allocation.width, widget->allocation.height);   glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective (40.0, 1.0, 1.0, 10.0);   glMatrixMode (GL_MODELVIEW); glLoadIdentity (); gluLookAt (0.0, 0.0, 3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); glTranslatef (0.0, 0.0, -3.0);   gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));   /*** OpenGL END ***/ }   static void size_allocate (GtkWidget *widget, GtkAllocation *allocation, gpointer data) { /* Synchronize OpenGL rendering pipeline on resizing X window. */ if (glwindow != NULL) gdk_gl_drawable_wait_gdk (GDK_GL_DRAWABLE (glwindow)); }   static gboolean configure_event (GtkWidget *widget, GdkEventConfigure *event, gpointer data) { /* gtk_drawing_area sends configure_event when it is realized. */ if (glwindow == NULL) return FALSE;   /*** OpenGL BEGIN ***/   if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext)) return FALSE;   glViewport (0, 0, widget->allocation.width, widget->allocation.height);   gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));   /*** OpenGL END ***/   return TRUE; }   static gboolean expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer data) { /*** OpenGL BEGIN ***/   if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext)) return FALSE;   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   glCallList (1);   if (gdk_gl_drawable_is_double_buffered (GDK_GL_DRAWABLE (glwindow))) gdk_gl_drawable_swap_buffers (GDK_GL_DRAWABLE (glwindow)); else glFlush ();   gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));   /*** OpenGL END ***/   return TRUE; }   static void unrealize (GtkWidget *widget, gpointer data) { if (glcontext != NULL) { g_object_unref (G_OBJECT (glcontext)); glcontext = NULL; }   if (glwindow != NULL) { g_object_unref (G_OBJECT (glwindow)); glwindow = NULL; }   if (glconfig != NULL) { g_object_unref (G_OBJECT (glconfig)); glconfig = NULL; } }   static void print_gl_config_attrib (GdkGLConfig *glconfig, const gchar *attrib_str, int attrib, gboolean is_boolean) { int value;   g_print ("%s = ", attrib_str); if (gdk_gl_config_get_attrib (glconfig, attrib, &value)) { if (is_boolean) g_print ("%s\n", value == TRUE ? "TRUE" : "FALSE"); else g_print ("%d\n", value); } else g_print ("*** Cannot get %s attribute value\n", attrib_str); }   static void examine_gl_config_attrib (GdkGLConfig *glconfig) { g_print ("\nOpenGL visual configurations :\n\n");   g_print ("gdk_gl_config_is_rgba (glconfig) = %s\n", gdk_gl_config_is_rgba (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_is_double_buffered (glconfig) = %s\n", gdk_gl_config_is_double_buffered (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_is_stereo (glconfig) = %s\n", gdk_gl_config_is_stereo (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_has_alpha (glconfig) = %s\n", gdk_gl_config_has_alpha (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_has_depth_buffer (glconfig) = %s\n", gdk_gl_config_has_depth_buffer (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_has_stencil_buffer (glconfig) = %s\n", gdk_gl_config_has_stencil_buffer (glconfig) ? "TRUE" : "FALSE"); g_print ("gdk_gl_config_has_accum_buffer (glconfig) = %s\n", gdk_gl_config_has_accum_buffer (glconfig) ? "TRUE" : "FALSE");   g_print ("\n");   print_gl_config_attrib (glconfig, "GDK_GL_USE_GL", GDK_GL_USE_GL, TRUE); print_gl_config_attrib (glconfig, "GDK_GL_BUFFER_SIZE", GDK_GL_BUFFER_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_LEVEL", GDK_GL_LEVEL, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_RGBA", GDK_GL_RGBA, TRUE); print_gl_config_attrib (glconfig, "GDK_GL_DOUBLEBUFFER", GDK_GL_DOUBLEBUFFER, TRUE); print_gl_config_attrib (glconfig, "GDK_GL_STEREO", GDK_GL_STEREO, TRUE); print_gl_config_attrib (glconfig, "GDK_GL_AUX_BUFFERS", GDK_GL_AUX_BUFFERS, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_RED_SIZE", GDK_GL_RED_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_GREEN_SIZE", GDK_GL_GREEN_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_BLUE_SIZE", GDK_GL_BLUE_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_ALPHA_SIZE", GDK_GL_ALPHA_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_DEPTH_SIZE", GDK_GL_DEPTH_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_STENCIL_SIZE", GDK_GL_STENCIL_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_RED_SIZE", GDK_GL_ACCUM_RED_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_GREEN_SIZE", GDK_GL_ACCUM_GREEN_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_BLUE_SIZE", GDK_GL_ACCUM_BLUE_SIZE, FALSE); print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_ALPHA_SIZE", GDK_GL_ACCUM_ALPHA_SIZE, FALSE);   g_print ("\n"); }   int main (int argc, char *argv[]) { gint major, minor;   GtkWidget *window; GtkWidget *vbox; GtkWidget *drawing_area; GtkWidget *button;   /*   * Init GTK.   */   gtk_init (&argc, &argv);   /*   * Init GdkGLExt.   */   gdk_gl_init (&argc, &argv);   /*   * Query OpenGL extension version.   */   gdk_gl_query_version (&major, &minor); g_print ("\nOpenGL extension version - %d.%d\n", major, minor);   /*   * Configure OpenGL-capable visual.   */   /* Try double-buffered visual */ glconfig = gdk_gl_config_new (&config_attributes[0]); if (glconfig == NULL) { g_print ("*** Cannot find the double-buffered visual.\n"); g_print ("*** Trying single-buffered visual.\n");   /* Try single-buffered visual */ glconfig = gdk_gl_config_new (&config_attributes[1]); if (glconfig == NULL) { g_print ("*** No appropriate OpenGL-capable visual found.\n"); exit (1); } }   examine_gl_config_attrib (glconfig);   /*   * Top-level window.   */   window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "low-level");   /*   * If window manager doesn't watch the WM_COLORMAP_WINDOWS property on   * the top-level window, we have to set OpenGL window's colormap to the   * top-level window.   */ gtk_widget_set_colormap (window, gdk_gl_config_get_colormap (glconfig));   /* Get automatically redrawn if any of their children changed allocation. */ gtk_container_set_reallocate_redraws (GTK_CONTAINER (window), TRUE);   g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (gtk_main_quit), NULL);   /*   * VBox.   */   vbox = gtk_vbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show (vbox);   /*   * Drawing area for drawing OpenGL scene.   */   drawing_area = gtk_drawing_area_new (); gtk_widget_set_size_request (drawing_area, 200, 200);   /* Set OpenGL-capable colormap. */ gtk_widget_set_colormap (drawing_area, gdk_gl_config_get_colormap (glconfig));   /* Disable backing store feature of the widget. */ gtk_widget_set_double_buffered (drawing_area, FALSE);   g_signal_connect_after (G_OBJECT (drawing_area), "realize", G_CALLBACK (realize), NULL); g_signal_connect (G_OBJECT (drawing_area), "size_allocate", G_CALLBACK (size_allocate), NULL); g_signal_connect (G_OBJECT (drawing_area), "configure_event", G_CALLBACK (configure_event), NULL); g_signal_connect (G_OBJECT (drawing_area), "expose_event", G_CALLBACK (expose_event), NULL); g_signal_connect (G_OBJECT (drawing_area), "unrealize", G_CALLBACK (unrealize), NULL);   gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);   gtk_widget_show (drawing_area);   /*   * Simple quit button.   */   button = gtk_button_new_with_label ("Quit");   g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (gtk_main_quit), NULL);   gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);   gtk_widget_show (button);   /*   * Show window.   */   gtk_widget_show (window);   /*   * Main loop.   */   /* Destroy the GLX context explicitly when application is terminated. */ gtk_quit_add_destroy (gtk_main_level () + 1, GTK_OBJECT (drawing_area));   gtk_main ();   return 0; }

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EDIT
j'ai trouvé : c'est

Code:

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gtk_widget_set_double_buffered(f->zone_gl,FALSE);

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et non

Code:

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gtk_widget_set_double_buffered(f->zone_gl,TRUE);

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