Add a fps_meter_ prefix to macros

[experiments/fps-meter.git] / fps-meter.c

diff --git a/fps-meter.c b/fps-meter.c
index 0de937e..2d9ea6b 100644 (file)
--- a/fps-meter.c
+++ b/fps-meter.c
@@ -17,78 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <stdio.h>
-#include <string.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
-
-#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);