SDL Fullscreen speed problems Win32

Beren77 · 2007-03-22T13:52:49

Hi, in a game I am developing, I use SDL_SetVideoMode(1024, 768, 32, SDL_DOUBLEBUF | SDL_FULLSCREEN)); to set the video mode. (And I also tried various combinations of SDL_HWSURFACE/SW_SURFACE, SDL_HWACCEL, SDL_ANYFORMAT, etc.) The problem is that the game runs smoothly in windowed mode (at around 50 FPS) which drop down to _7_ FPS in full screen. The game itself is "simply" blitting 2d tiles on a surface, using SDL_BlitSurface. Scrolling is involved and it works like a breeze in windowed mode, as I said... I googled and found that this seems to be a problem in Windows only, namely the renderer appears to be DirectX 5 which might not be supported by MS which causes it to be so slow. So, I am supposed to set the renderer to the Windows GDI which supposedly is going to make it faster (sounds bad enough to me, but if it works...). First problem: How do I set the video mode? The function SDL_setenv does not appear to be in the SDL or SDLmain.dll. (I am using SDL 1.2.9 btw -- could upgrading to 1.2.11 help?). However, I found the information stated above here in a _pascal_ forum. I am using Visual C++ (.Net 2003). I tried setting a regular environment variable under Windows using setenv("SDL_VIDEODRIVER=windib"); which had no effect at all (and I called it, before I called SDL_Init. The call to SDL_Init is SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_TIMER | SDL_INIT_AUDIO). Anything wrong here?). Any ideas what could be wrong? Thanks for your help! Beren

Engines and Middleware Programming

Started by Beren77 March 21, 2007 04:58 AM

9 comments, last by rip-off 17 years, 1 month ago

rip-off

11,000

March 22, 2007 01:52 PM

Quote:Original post by Beren77
Updating to SDL 1.2.11 solved the problem for me. Why? I don't have a clue...

I believe that SDL has changed the default backend on win32 from directX to GDI in recent versions. I don't think you'll get hardware surfaces in GDI so its back to software versus hardware surface performance.

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SDL Fullscreen speed problems Win32

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SDL Fullscreen speed problems Win32

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