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Added high resolution timing API: SDL_GetPerformanceCounter(), SDL_GetPerformanceFrequency()

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This commit is contained in:
Sam Lantinga 2011-03-25 14:45:04 -07:00
parent 98e5ddb37d
commit 85ad17e7d6
8 changed files with 127 additions and 1 deletions
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12
test/testtimer.c
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@ -29,8 +29,9 @@ callback(Uint32 interval, void *param)
int
main(int argc, char *argv[])
{
int desired;
int i, desired;
SDL_TimerID t1, t2, t3;
Uint64 start, now;
if (SDL_Init(SDL_INIT_TIMER) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
@ -85,6 +86,15 @@ main(int argc, char *argv[])
SDL_RemoveTimer(t2);
SDL_RemoveTimer(t3);
start = SDL_GetPerformanceCounter();
for (i = 0; i < 1000000; ++i) {
ticktock(0);
}
now = SDL_GetPerformanceCounter();
printf("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
SDL_Quit();
return (0);
}
/* vi: set ts=4 sw=4 expandtab: */