X-Git-Url: https://git.ao2.it/experiments/fps-limit.git/blobdiff_plain/ce00a8af50035f3db13f1795061d55e943f2e969..HEAD:/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 <http://www.gnu.org/licenses/>.
  */
 
-#include <stdio.h>
-#include <time.h>
-
-#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;