+ occlude_shader.attach_shader(get_fullscreen_vertex_shader());
+ occlude_shader.attach_shader_owned(new FragmentShader(occlude_fs));
+ occlude_shader.link();
+
+ combine_shader.attach_shader(get_fullscreen_vertex_shader());
+ combine_shader.attach_shader_owned(new FragmentShader(combine_fs));
+ combine_shader.link();
+