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Bug 1211

Summary: VSync can not be reinitialized with another value
Product: SDL Reporter: Andrey Budko <e6y>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: icculus
Version: 1.2.14   
Hardware: x86   
OS: Windows (All)   

Description Andrey Budko 2011-05-24 00:29:48 UTC 
Something like that:

SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
screen = SDL_SetVideoMode(...)
SDL_GL_GetAttribute(SDL_GL_SWAP_CONTROL, &temp); // temp is 1

bla bla

SDL_FreeSurface(screen);

SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0);
screen = SDL_SetVideoMode(...)
SDL_GL_GetAttribute(SDL_GL_SWAP_CONTROL, &temp); // temp is 1
Comment 1 Ryan C. Gordon 2011-08-21 08:57:03 UTC 
Don't call SDL_FreeSurface(screen) ... if you replace that with...

    SDL_QuitSubSystem(SDL_INIT_VIDEO);
    SDL_Init(SDL_INIT_VIDEO);

...then the problem should be fixed.

(In SDL 1.3, we have a proper API for toggling vsync on existing windows.)

--ryan.