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SDL_RenderSetVSync(): Restrict vsync to 0 or 1

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In the future, we might want to support special swap intervals. To
prevent applications from expecting nonzero values of vsync to be the
same as "on", fail with SDL_Unsupported() if the value passed is neither
0 nor 1.
This commit is contained in:
Misa 2021-09-14 15:51:17 -07:00 committed by Sam Lantinga
parent 4549769d7d
commit 4a9947336c
2 changed files with 5 additions and 1 deletions
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2
include/SDL_render.h
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@ -1698,7 +1698,7 @@ extern DECLSPEC void *SDLCALL SDL_RenderGetMetalCommandEncoder(SDL_Renderer * re
* Toggle VSync of the given renderer. * Toggle VSync of the given renderer.
* *
* \param renderer The renderer to toggle * \param renderer The renderer to toggle
* \param vsync Non-zero for on, zero for off * \param vsync 1 for on, 0 for off. All other values are reserved
* \returns a 0 int on success, or non-zero on failure * \returns a 0 int on success, or non-zero on failure
*/ */
extern DECLSPEC int SDLCALL SDL_RenderSetVSync(SDL_Renderer* renderer, int vsync); extern DECLSPEC int SDLCALL SDL_RenderSetVSync(SDL_Renderer* renderer, int vsync);

4
src/render/SDL_render.c
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@ -4129,6 +4129,10 @@ SDL_RenderSetVSync(SDL_Renderer * renderer, int vsync)
{ {
CHECK_RENDERER_MAGIC(renderer, -1); CHECK_RENDERER_MAGIC(renderer, -1);
if (vsync != 0 && vsync != 1) {
return SDL_Unsupported();
}
if (renderer->SetVSync) { if (renderer->SetVSync) {
return renderer->SetVSync(renderer, vsync); return renderer->SetVSync(renderer, vsync);
} }