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Add support for (GLX|WGL)_EXT_swap_control_tear.

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This required a small public API change: SDL_GL_SetSwapInterval() now accepts
 negative values, and SDL_GL_GetSwapInterval() doesn't report errors anymore
 (if it can't work, it'll return zero as a reasonable default).

If you need to test for errors, such as a lack of swap_control_tear support,
 check the results of SDL_GL_SetSwapInterval() when you set your desired
 value.
This commit is contained in:
Ryan C. Gordon 2012-08-01 20:29:36 -04:00
parent 706ea79345
commit 2cd5fc4e97
10 changed files with 67 additions and 52 deletions
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10
include/SDL_video.h
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@ -789,7 +789,9 @@ extern DECLSPEC int SDLCALL SDL_GL_MakeCurrent(SDL_Window * window,
* \brief Set the swap interval for the current OpenGL context.
*
* \param interval 0 for immediate updates, 1 for updates synchronized with the
* vertical retrace.
* vertical retrace. If the system supports it, you may
* specify -1 to allow late swaps to happen immediately
* instead of waiting for the next retrace.
*
* \return 0 on success, or -1 if setting the swap interval is not supported.
*
@ -801,8 +803,10 @@ extern DECLSPEC int SDLCALL SDL_GL_SetSwapInterval(int interval);
* \brief Get the swap interval for the current OpenGL context.
*
* \return 0 if there is no vertical retrace synchronization, 1 if the buffer
* swap is synchronized with the vertical retrace, and -1 if getting
* the swap interval is not supported.
* swap is synchronized with the vertical retrace, and -1 if late
* swaps happen immediately instead of waiting for the next retrace.
* If the system can't determine the swap interval, or there isn't a
* valid current context, this will return 0 as a safe default.
*
* \sa SDL_GL_SetSwapInterval()
*/