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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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17
test/testgl2.c
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@ -240,18 +240,21 @@ main(int argc, char *argv[])
}
if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
SDL_GL_SetSwapInterval(1);
/* try late-swap-tearing first. If not supported, try normal vsync. */
if (SDL_GL_SetSwapInterval(-1) == -1) {
SDL_GL_SetSwapInterval(1);
}
} else {
SDL_GL_SetSwapInterval(0);
SDL_GL_SetSwapInterval(0); /* disable vsync. */
}
SDL_GetCurrentDisplayMode(0, &mode);
printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format));
printf("Screen BPP : %d\n", SDL_BITSPERPIXEL(mode.format));
printf("Swap Interval : %d\n", SDL_GL_GetSwapInterval());
printf("\n");
printf("Vendor : %s\n", glGetString(GL_VENDOR));
printf("Renderer : %s\n", glGetString(GL_RENDERER));
printf("Version : %s\n", glGetString(GL_VERSION));
printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
printf("Vendor : %s\n", glGetString(GL_VENDOR));
printf("Renderer : %s\n", glGetString(GL_RENDERER));
printf("Version : %s\n", glGetString(GL_VERSION));
printf("\n");
status = SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);