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sdlayer.cpp: fix vsync heartbeat issue on some NVidia & Intel drivers

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git-svn-id: https://svn.eduke32.com/eduke32@6689 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
pogokeen 2018-02-22 23:25:56 +00:00
parent b2470aa677
commit 9f48927ea8
1 changed files with 11 additions and 0 deletions
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11
source/build/src/sdlayer.cpp
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@ -101,6 +101,7 @@ char nogl=0;
#endif
static int32_t vsync_renderlayer;
int32_t maxrefreshfreq=0;
static uint32_t currentVBlankInterval=0;
// last gamma, contrast, brightness
static float lastvidgcb[3];
@ -1521,6 +1522,8 @@ void setrefreshrate(void)
initprintf("Refresh rate: %dHz\n", newmode.refresh_rate);
SDL_SetWindowDisplayMode(sdl_window, &newmode);
}
currentVBlankInterval = 1000/newmode.refresh_rate;
}
static void sdl_trycreaterenderer_fail(char const * const failurepoint)
@ -1789,7 +1792,15 @@ void showframe(int32_t w)
#ifdef __ANDROID__
AndroidDrawControls();
#endif
static uint32_t lastSwapTime = 0;
SDL_GL_SwapWindow(sdl_window);
if (vsync)
{
// busy loop until we're ready to update again
while (SDL_GetTicks()-lastSwapTime < currentVBlankInterval) {}
}
lastSwapTime = SDL_GetTicks();
return;
}
#endif