X-Git-Url: https://git.ao2.it/experiments/fps-meter.git/blobdiff_plain/d73b9869570111a3249139508e43f3f722adad2e..refs/heads/master:/fps-meter.c?ds=sidebyside
diff --git a/fps-meter.c b/fps-meter.c
index 0de937e..2d9ea6b 100644
--- a/fps-meter.c
+++ b/fps-meter.c
@@ -17,78 +17,7 @@
* along with this program. If not, see .
*/
-#include
-#include
-#include
-
-#ifdef DEBUG
-#define dbg(...) \
- do { \
- printf(__VA_ARGS__); \
- printf("\n"); \
- fflush(stdout); \
- } while(0)
-#else
-#define dbg(...) do {} while(0)
-#endif
-
-#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)
-
-struct fps_meter_stats {
- struct timespec time_start;
- struct timespec time_end;
- struct timespec elapsed;
-
- unsigned int frames;
- double nsecs;
-};
-
-static void fps_meter_init(struct fps_meter_stats *stats)
-{
- memset(stats, 0, sizeof(*stats));
-
- clock_gettime(CLOCK_MONOTONIC, &stats->time_start);
- dbg("Init time: s: %ld, ns: %ld", stats->time_start.tv_sec, stats->time_start.tv_nsec);
-}
-
-static void fps_meter_update(struct fps_meter_stats *stats)
-{
- dbg("Start time: s: %ld, ns: %ld", stats->time_start.tv_sec, stats->time_start.tv_nsec);
-
- clock_gettime(CLOCK_MONOTONIC, &stats->time_end);
- dbg("End time: s: %ld, ns: %ld", stats->time_end.tv_sec, stats->time_end.tv_nsec);
-
- timespecsub(&stats->time_end, &stats->time_start, &stats->elapsed);
- dbg("Elapsed s: %ld ns: %ld", stats->elapsed.tv_sec, stats->elapsed.tv_nsec);
-
- stats->frames++;
- stats->nsecs += (stats->elapsed.tv_sec * NSEC_PER_SEC + stats->elapsed.tv_nsec);
- if (stats->nsecs >= NSEC_PER_SEC) {
- /*
- * if we were garanteed that each frame took less than
- * a second, then just printing 'frames' would be enough here,
- * but if we want to cover the case when a frame may take more
- * than a second, some calculations have to be done.
- */
- float fps = stats->frames / (stats->nsecs / NSEC_PER_SEC);
- printf("(frames: %d, nsecs: %f) FPS: %.2f\n", stats->frames, stats->nsecs, fps);
- stats->nsecs = 0;
- stats->frames = 0;
- }
-
- /* update the stats for the next iteration */
- clock_gettime(CLOCK_MONOTONIC, &stats->time_start);
-}
+#include "fps-meter.h"
int main(void)
{
@@ -98,7 +27,7 @@ int main(void)
fps_meter_init(&stats);
while (1) {
/* simulate some workload of about 60fps */
- dbg("Doing some work, which takes about %d ns", NSEC_PER_SEC / 60);
+ fps_meter_dbg("Doing some work, which takes about %d ns", NSEC_PER_SEC / 60);
tmp.tv_sec = 0;
tmp.tv_nsec = NSEC_PER_SEC / 60;
clock_nanosleep(CLOCK_MONOTONIC, 0, &tmp, NULL);