void clear_output(Canvas *canvas, VFrame *output);
// Finish all active opengl requests
void clear_output(Canvas *canvas, VFrame *output);
// Finish all active opengl requests
void do_fade(Canvas *canvas, VFrame *frame, float fade);
void convert_cmodel(Canvas *canvas, VFrame *output, int dst_cmodel);
void do_fade(Canvas *canvas, VFrame *frame, float fade);
void convert_cmodel(Canvas *canvas, VFrame *output, int dst_cmodel);