int
init_opengl_gdk_3Demu( GdkDrawable * drawable) {
GdkGLConfig *glconfig;
/* create the off screen pixmap */
target_pixmap = gdk_pixmap_new ( drawable, 256, 192, -1);
if ( target_pixmap == NULL) {
g_print ("*** Failed to create pixmap.\n");
return 0;
}
glconfig = gdk_gl_config_new_by_mode ((GdkGLConfigMode)(GDK_GL_MODE_RGBA |
GDK_GL_MODE_DEPTH |
GDK_GL_MODE_STENCIL |
GDK_GL_MODE_SINGLE));
if (glconfig == NULL)
{
g_print ("*** No appropriate OpenGL-capable visual found.\n");
return 0;
}
/*
* Set OpenGL-capability to the pixmap
*/
gldrawable = GDK_GL_DRAWABLE (gdk_pixmap_set_gl_capability (target_pixmap,
glconfig,
NULL));
if ( gldrawable == NULL) {
g_print ("Failed to create the GdkGLPixmap\n");
return 0;
}
glcontext = gdk_gl_context_new (gldrawable,
NULL,
FALSE,
GDK_GL_RGBA_TYPE);
if (glcontext == NULL)
{
g_print ("Connot create the OpenGL rendering context\n");
return 0;
}
oglrender_init = _oglrender_init;
oglrender_beginOpenGL = _oglrender_beginOpenGL;
oglrender_endOpenGL = _oglrender_endOpenGL;
return 1;
}
/// Returns a "global" (to the document) gdkgl context that can be used to share display lists
GdkGLContext* gdkgl_share_list()
{
if(!m_gdkgl_share_list)
{
GdkGLConfig* const config = gdk_gl_config_new_by_mode(
static_cast<GdkGLConfigMode>(GDK_GL_MODE_RGBA | GDK_GL_MODE_DOUBLE | GDK_GL_MODE_DEPTH));
return_val_if_fail(config, 0);
GdkPixmap* const pixmap = gdk_pixmap_new(0, 8, 8, gdk_gl_config_get_depth(config));
return_val_if_fail(pixmap, 0);
GdkGLPixmap* const glpixmap = gdk_pixmap_set_gl_capability(pixmap, config, 0);
return_val_if_fail(glpixmap, 0);
GdkGLContext* const context = gdk_gl_context_new(
gdk_pixmap_get_gl_drawable(pixmap), 0, true, GDK_GL_RGBA_TYPE);
return_val_if_fail(context, 0);
m_gdkgl_share_list = context;
}
return m_gdkgl_share_list;
}
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;
}
