static gboolean
expose_event (GtkWidget *widget,
GdkEventExpose *event,
gpointer data)
{
GtkAllocation allocation;
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
gtk_widget_get_allocation (widget, &allocation);
/*** OpenGL BEGIN ***/
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
return FALSE;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Sync. */
gdk_gl_drawable_wait_gl (gldrawable);
/* GDK rendering. */
gdk_draw_rectangle (GDK_DRAWABLE (gldrawable),
gtk_widget_get_style (widget)->black_gc,
TRUE,
allocation.width/10,
allocation.height/10,
allocation.width*8/10,
allocation.height*8/10);
/* Sync. */
gdk_gl_drawable_wait_gdk (gldrawable);
glCallList (1);
glFlush ();
gdk_gl_drawable_gl_end (gldrawable);
/*** OpenGL END ***/
return TRUE;
}
static gboolean
configure_event (GtkWidget *widget,
GdkEventConfigure *event,
gpointer data)
{
GdkGLDrawable *gldrawable;
static gboolean is_initialized = FALSE;
/*
* Create an OpenGL off-screen rendering area.
*/
if (pixmap != NULL)
g_object_unref (G_OBJECT (pixmap));
pixmap = gdk_pixmap_new (widget->window,
widget->allocation.width,
widget->allocation.height,
-1);
/*
* Set OpenGL-capability to the pixmap
*/
gldrawable = GDK_GL_DRAWABLE (gdk_pixmap_set_gl_capability (pixmap,
glconfig,
NULL));
/*
* Create OpenGL rendering context (not direct).
*/
if (glcontext == NULL)
{
glcontext = gdk_gl_context_new (gldrawable,
NULL,
FALSE,
GDK_GL_RGBA_TYPE);
if (glcontext == NULL)
{
g_print ("Connot create the OpenGL rendering context\n");
if (gtk_main_level () != 0)
gtk_main_quit ();
return TRUE;
}
g_print ("The OpenGL rendering context is created\n");
}
/*** OpenGL BEGIN ***/
if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext))
goto NO_GL;
if (!is_initialized)
{
init ();
is_initialized = TRUE;
}
glViewport (0, 0,
widget->allocation.width, widget->allocation.height);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Sync. */
gdk_gl_drawable_wait_gl (gldrawable);
/* GDK rendering. */
gdk_draw_rectangle (GDK_DRAWABLE (gldrawable),
widget->style->black_gc,
TRUE,
widget->allocation.width/10,
widget->allocation.height/10,
widget->allocation.width*8/10,
widget->allocation.height*8/10);
/* Sync. */
gdk_gl_drawable_wait_gdk (gldrawable);
glCallList (1);
glFlush ();
gdk_gl_drawable_gl_end (gldrawable);
/*** OpenGL END ***/
NO_GL:
return TRUE;
}
