[SDL] Re: CPU Usage
clemens at 1541.org
Sat Jul 30 03:05:44 PDT 2005
Diaa Sami <diaasami at yahoo.com> wrote:
> I'm drawing transparent images over 70% of the screen.
> but the FPS is low even without drawing(and without the limiter, of
> when I draw nothing to the screen and turn off the fps limiter, I get
> around 95 fps.
> the code:
> // SDL setup
> screen = SDL_SetVideoMode(640, 480, 0, SDL_HWSURFACE);
> // drawing loop
> SDL_FillRect(screen, NULL, black);
> SDL_UpdateRect(screen, 0, 0, 0, 0);
> if this is normal, then I'll have to use SDL_UpdateRects to speed up
> the drawing, otherwise please tell me what's wrong with my SDL
SDL_UpdateRect(screen, 0, 0, 0, 0); means updateing the whole screen,
you know. if the screen is not doublebuffered and/or not a hwsurface,
this means copying the whole surface each frame. comment it and see
what it does to your framrate.
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