static void video_init_gl(void) {
video.glcontext = SDL_GL_CreateContext(video.window);
load_gl_functions();
check_gl_extensions();
#ifdef DEBUG_GL
if(glext.debug_output) {
video_gl_debug_enable();
} else {
log_warn("OpenGL debugging is not supported by the implementation");
}
#endif
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glEnable(GL_CULL_FACE);
glEnable(GL_BLEND);
init_quadvbo();
glClear(GL_COLOR_BUFFER_BIT);
}
static gboolean
load_required_symbols (void)
{
static gboolean success = FALSE;
if (success)
return TRUE;
/* We don't link against libGL directly because cogl may want to
* use something else. This assumes that cogl has been initialized
* and dynamically loaded libGL at this point.
*/
if (!load_gl_symbol ("glGetString", (void **) &meta_gl_get_string))
goto out;
if (!load_gl_symbol ("glGetIntegerv", (void **) &meta_gl_get_integerv))
goto out;
if (!load_gl_symbol ("glGetStringi", (void **) &meta_gl_get_stringi))
goto out;
if (!check_gl_extensions ())
{
meta_verbose ("MetaSyncRing: couldn't find required GL extensions\n");
goto out;
}
if (!load_gl_symbol ("glDeleteSync", (void **) &meta_gl_delete_sync))
goto out;
if (!load_gl_symbol ("glClientWaitSync", (void **) &meta_gl_client_wait_sync))
goto out;
if (!load_gl_symbol ("glWaitSync", (void **) &meta_gl_wait_sync))
goto out;
if (!load_gl_symbol ("glImportSyncEXT", (void **) &meta_gl_import_sync))
goto out;
if (!load_gl_symbol ("glFenceSync", (void **) &meta_gl_fence_sync))
goto out;
success = TRUE;
out:
return success;
}
