I am sorry to bother with the same problem but I could not fix it, so I had to
modify the program.
Earlier I mentioned a problem in implementing the share-lists.c example in
Windows Vista and then when you run the example sends me the following errors
(share_list.exe: 2108): GtkGLExt-WARNING **: can not create GdkGLContext
(share_list.exe: 2108): GdkGLExt-CRITICAL **: file gdkglwindow-win32.c: line
297
(gdk_gl_window_impl_win32_make_context_current): assertion
`GDK_IS_GL_CONTEXT_IM
PL_WIN32 (glcontext) 'failed
etc…
The problem is that I can not share the context of different opengl viewport,
so I can not use a texture defined in a viewport or a list of drawing in
another viewport.
when the program execute the line
GdkGLContext * glcontext = gtk_widget_get_gl_context (widget);
In the following function.
static void realize_main (GtkWidget * widget, GLfloat * light_diffuse);
static void realize_sub (GtkWidget * widget, GLfloat * light_diffuse);
static void realize_sub (GtkWidget * widget, GLfloat * light_diffuse);
static gboolean configure_event (GtkWidget * widget, GdkEventConfigure * event,
gpointer data);
static gboolean expose_event (GtkWidget * widget, GdkEventExpose * event,
gpointer data);
Sends me the following error.
(share_list.exe: 2108): GtkGLExt-WARNING **: can not create GdkGLContext
because I can not get the context of opengl then glcontext = NULL; and when
execute the line.
if (! gdk_gl_drawable_gl_begin (gldrawable, glcontext))
I get the following error
(share_list.exe: 2108): GdkGLExt-CRITICAL **: file gdkglwindow-win32.c: line
297
(gdk_gl_window_impl_win32_make_context_current): assertion
`GDK_IS_GL_CONTEXT_IM
PL_WIN32 (glcontext) 'failed
So the condition is false and does not draw the viewport, for that reason I can
only see a viewport and the other two do not show anything,
Thought the problem was that I can not get in the context of opengl with
gtk_widget_get_gl_context then I use global variable for manager the context,
but doing this I can not show any viewport.
Then my next solution was to create a list drawing for each viewport, so it
would also have to do the same with the textures and because I can not share
between viewports, the code as follows
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
#include <stdlib.h>
#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
static GLfloat red[] = {1.0, 0.0, 0.0, 1.0};
static GLfloat yellow[] = {1.0, 1.0, 0.0, 1.0};
static GLfloat green[] = {0.0, 1.0, 0.0, 1.0};
GdkGLContext *gCont;
static void init_gl (GLfloat *light_diffuse){
static GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};
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);
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);
}
static void realize_main (GtkWidget *widget, GLfloat *light_diffuse){
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
GLUquadricObj *qobj;
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
//if (!gdk_gl_drawable_gl_begin (gldrawable, gCont))
return;
qobj = gluNewQuadric ();
gluQuadricDrawStyle (qobj, GLU_FILL);
glNewList (1, GL_COMPILE);
gluSphere (qobj, 1.0, 20, 20);
glEndList ();
init_gl (light_diffuse);
gdk_gl_drawable_gl_end (gldrawable);
}
static void realize_sub (GtkWidget *widget, GLfloat *light_diffuse){
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
//if (!gdk_gl_drawable_gl_begin (gldrawable, gCont))
return;
init_gl (light_diffuse);
gdk_gl_drawable_gl_end (gldrawable);
}
static gboolean configure_event (GtkWidget *widget, GdkEventConfigure *event,
gpointer data){
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
//if (!gdk_gl_drawable_gl_begin (gldrawable, gCont))
return FALSE;
glViewport (0, 0,
widget->allocation.width, widget->allocation.height);
gdk_gl_drawable_gl_end (gldrawable);
return TRUE;
}
static gboolean expose_event (GtkWidget *widget, GdkEventExpose *event,
gpointer data){
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
//if (!gdk_gl_drawable_gl_begin (gldrawable, gCont))
return FALSE;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glCallList (1);
if (gdk_gl_drawable_is_double_buffered (gldrawable))
gdk_gl_drawable_swap_buffers (gldrawable);
else
glFlush ();
gdk_gl_drawable_gl_end (gldrawable);
return TRUE;
}
int main (int argc, char *argv[]){
GdkGLConfig *glconfig;
GdkGLContext *glcontext;
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *drawing_area;
GtkWidget *button;
gtk_init (&argc, &argv);
gtk_gl_init (&argc, &argv);
glconfig = gdk_gl_config_new_by_mode
(static_cast<GdkGLConfigMode>(GDK_GL_MODE_RGB|GDK_GL_MODE_DEPTH|GDK_GL_MODE_DOUBLE));
if (glconfig == NULL){
g_print ("*** Cannot find the double-buffered visual.\n");
g_print ("*** Trying single-buffered visual.\n");
glconfig = gdk_gl_config_new_by_mode
(static_cast<GdkGLConfigMode>(GDK_GL_MODE_RGB|GDK_GL_MODE_DEPTH));
if (glconfig == NULL){
g_print ("*** No appropriate OpenGL-capable visual
found.\n");
exit (1);
}
}
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "share-lists");
gtk_container_set_reallocate_redraws (GTK_CONTAINER (window), TRUE);
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
g_signal_connect (G_OBJECT (window), "delete_event",G_CALLBACK
(gtk_main_quit), NULL);
vbox = gtk_vbox_new (FALSE, 10);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawing_area, 120, 120);
gtk_widget_set_gl_capability (drawing_area,
glconfig,
NULL,
TRUE,
GDK_GL_RGBA_TYPE);
g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize_main), red);
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);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
gtk_widget_show (drawing_area);
gtk_widget_realize (drawing_area);
glcontext = gtk_widget_get_gl_context (drawing_area);
gCont = glcontext;
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawing_area, 120, 120);
gtk_widget_set_gl_capability (drawing_area,
glconfig,
NULL,//glcontext, /* share_list */
TRUE,
GDK_GL_RGBA_TYPE);
//g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize_sub), yellow);
g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize_main), yellow);
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);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
gtk_widget_show (drawing_area);
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawing_area, 120, 120);
gtk_widget_set_gl_capability (drawing_area,
glconfig,
NULL,//glcontext, /* share_list */
TRUE,
GDK_GL_RGBA_TYPE);
//g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize_sub), green);
g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize_main), green);
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);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
gtk_widget_show (drawing_area);
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);
gtk_widget_show (window);
gtk_main ();
return 0;
}
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
But this is a bad solution, since it is much waste of memory, if anyone knows
how to solve this problem could help me?.
Thank you very much.
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