+ if(command->frame) {
+// Render to PBuffer
+ command->frame->enable_opengl();
+ command->frame->set_opengl_state(VFrame::SCREEN);
+ canvas_w = command->frame->get_w();
+ canvas_h = command->frame->get_h();
+ }
+ else {
+// Render to canvas
+ window->enable_opengl();
+ canvas_w = window->get_w();
+ canvas_h = window->get_h();
+ }
+