X-Git-Url: https://git.ao2.it/experiments/fps-limit.git/blobdiff_plain/ce00a8af50035f3db13f1795061d55e943f2e969..5b5e421a8ef9318f08455f0aa30d1278e1e8ca9f:/fps-limit.c
diff --git a/fps-limit.c b/fps-limit.c
index 7759349..2c24807 100644
--- a/fps-limit.c
+++ b/fps-limit.c
@@ -17,62 +17,26 @@
* along with this program. If not, see .
*/
-#include
-#include
-
-#ifdef DEBUG
-#define dbg(...) \
- do { \
- printf(__VA_ARGS__); \
- printf("\n"); \
- fflush(stdout); \
- } while(0)
-#else
-#define dbg(...) do {} while(0)
-#endif
+#include "fps-limit.h"
#define FPS 60
-#define NSEC_PER_SEC 1000000000
-
-#define timespecsub(a, b, result) \
- do { \
- (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
- (result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \
- if ((result)->tv_nsec < 0) { \
- --(result)->tv_sec; \
- (result)->tv_nsec += 1000000000; \
- } \
- } while(0)
-
int main(void)
{
- struct timespec time_start;
- struct timespec time_end;
- struct timespec elapsed;
- struct timespec remaining = {0, 0};
-
+ struct fps_limit_stats stats;
struct timespec tmp;
+ fps_limit_init(&stats, FPS);
while (1) {
- clock_gettime(CLOCK_MONOTONIC, &time_start);
- dbg("Start time: s: %ld, ns: %ld", time_start.tv_sec, time_start.tv_nsec);
+ fps_limit_dbg("Doing some work, minimum: %dns", NSEC_PER_SEC / FPS);
- dbg("Doing some work, max: %d", NSEC_PER_SEC / FPS);
+ /* simulate a shorter workload */
tmp.tv_sec = 0;
tmp.tv_nsec = (NSEC_PER_SEC / FPS) * 2 / 3;
nanosleep(&tmp, NULL);
- clock_gettime(CLOCK_MONOTONIC, &time_end);
- dbg("End time: s: %ld, ns: %ld", time_end.tv_sec, time_end.tv_nsec);
- timespecsub(&time_end, &time_start, &elapsed);
- dbg("Elapsed s: %ld ns: %ld", elapsed.tv_sec, elapsed.tv_nsec);
- if (elapsed.tv_sec == 0 && elapsed.tv_nsec < NSEC_PER_SEC / FPS) {
- /* remaining delay, _relative_ to time_end */
- remaining.tv_nsec = (NSEC_PER_SEC / FPS) - elapsed.tv_nsec;
- dbg("Sleeping for: ns: %ld", remaining.tv_nsec);
- clock_nanosleep(CLOCK_MONOTONIC, 0, &remaining, NULL);
- }
+ /* and wait for the delay imposed by the limit */
+ fps_limit_sleep(&stats);
}
return 0;