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VSync is not activated under MacOS X Snow Leopard #569

SDLBugzilla opened this issue Feb 10, 2021 · 0 comments

VSync is not activated under MacOS X Snow Leopard #569

SDLBugzilla opened this issue Feb 10, 2021 · 0 comments


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@SDLBugzilla SDLBugzilla commented Feb 10, 2021

This bug report was migrated from our old Bugzilla tracker.

Reported in version: 1.2.14
Reported for operating system, platform: Mac OS X 10.6, All

Comments on the original bug report:

On 2010-05-10 14:39:56 +0000, Vittorio Giovara wrote:

the usual 1.2 way of enabling Vsync is not working since mac os x 10.6 came out
i don't know if it's a driver issue but just writing

    SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);

has no effect and a lot of tearing happens when using a gl context.
We found out the fix code in some python game in which they used

one := 1;
CGLSetParameter(CGLGetCurrentContext(), 222, @one);

to workaround it. Above code is in pascal and links agains the OpenGL library.
With this fix tearing never occurs under any mac version; i have untested if the problem also affects sdl 1.3, might be worth to try it.

On 2011-02-16 04:17:25 +0000, Sam Lantinga wrote:

This is working correctly in SDL 1.3.

On 2011-02-16 04:48:33 +0000, Vittorio Giovara wrote:

but isn't it worth to fix this bug in the sdl 1.2 branch?

On 2011-02-16 05:02:10 +0000, Sam Lantinga wrote:

Yes, but I won't have time to get to it for a while. :)

On 2011-08-21 07:58:38 +0000, Ryan C. Gordon wrote:

Is the concern that 1.2 isn't setting vsync at all, or it doesn't set vsync until you call SDL_SetVideoMode() again?

1.3 lets you toggle vsync on an existing context, 1.2 needs you to specify vsync preferences before setting the video mode.

(it's working here on Lion, fwiw: run test/testgl -sync, and you can see.)


On 2011-08-23 01:28:22 +0000, Vittorio Giovara wrote:

oh my bad, i was enabling SDL_GL_SWAP_CONTROL after creating the window
when enabled before, it works fine! thanks for pointing it out

@SDLBugzilla SDLBugzilla added bug invalid labels Feb 10, 2021
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