SDL Framerates and SDL_Flip()

TFS_Waldo · 2006-04-19T07:46:11

Well, I've been working on my SDL engine today. And I have noticed that even when I draw a single sprite like this: void Render() { // Needed for drawing sprites; or else it will leave a trail when I move // the sprite SDL_FillRect(g_pEngine->GetScreen(), NULL, 0x00000000); sprite1.Draw(g_pEngine->GetScreen()); // Draw the sprite SDL_Flip(g_pEngine->GetScreen()); } My frame rate is only 30-33 FPS. I am on Windows 2000 Pro SP4, PIII 733MHz, GeForce FX 5200 128MB, 256MB RAM. At first, I didn't understand why the FPS was so low. But when I comment out the "sprite1.Draw(...)" call, the FPS stays nearly the same. But when I comment out the "SDL_Flip" call, I get a frame rate of 50,000+. Is that possible? LoL. Could someone enlighten me on what is causing this? And "g_pEngine->GetScreen()" only does "return m_pScreen;", which is defined as (in 'CEngine') "SDL_Surface *m_pScreen;". Why does "SDL_Flip" cause such a low frame rate? Or am I doing something wrong here? Thanks in advance, Matt U.

Engines and Middleware Programming

Started by TFS_Waldo April 16, 2006 03:45 AM

9 comments, last by DeadXorAlive 18 years ago

DeadXorAlive

535

April 19, 2006 07:46 AM

Quote:Original post by Kylotan
Quote:Original post by DeadXorAlive
Yes, but isn't this refresh rate supposed to be at least 60Herz or something like that? As the OP reported FPS of 30... Or does that make me sound silly?

60 is a multiple of 30. If you're not quick enough to draw the whole frame at 60Hz, you'll end up waiting for every 2nd retrace, ie. 30Hz.

Very silly. Thanks.

SDL Framerates and SDL_Flip()

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SDL Framerates and SDL_Flip()

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