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[client] minor logical order optimization of the render loop

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Geoffrey McRae 2017-12-07 17:10:09 +11:00
parent b1d48943c7
commit 34f07ec77f
1 changed files with 24 additions and 26 deletions
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50
client/main.c
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@ -226,31 +226,6 @@ int renderThread(void * unused)
pollDelay = microtime() - pollStart - 100;
}
// sleep for the remainder of the presentation time
if (frameCount > 0)
{
const uint64_t t = microtime();
drawTime = t - drawStart;
if (drawTime < presentTime)
{
const uint64_t delta = presentTime - drawTime;
if (delta > 1000)
usleep(delta - 1000);
if (!params.vsync)
{
// poll for the final microsecond
const uint64_t target = t + delta;
while(microtime() <= target) {}
}
}
// ensure buffers are flushed
glFinish();
}
drawStart = microtime();
// we must take a copy of the header, both to let the guest advance and to
// prevent the contained arguments being abused to overflow buffers
memcpy(&header, state.shm, sizeof(struct KVMFRHeader));
@ -443,8 +418,31 @@ int renderThread(void * unused)
SDL_RenderPresent(state.renderer);
// sleep for the remainder of the presentation time
{
const uint64_t t = microtime();
drawTime = t - drawStart;
if (drawTime < presentTime)
{
const uint64_t delta = presentTime - drawTime;
if (delta > 1000)
usleep(delta - 1000);
if (!params.vsync)
{
// poll for the final microsecond
const uint64_t target = t + delta;
while(microtime() <= target) {}
}
}
// ensure buffers are flushed
glFinish();
drawStart = microtime();
}
++frameCount;
uint64_t t = microtime();
const uint64_t t = microtime();
fpsTime += t - fpsStart;
fpsStart = t;
}