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Report how many frames is needed to measure FPS.

This commit is contained in:
Themaister 2013-02-10 14:34:03 +01:00
parent ddc51c3eba
commit 5632836446
1 changed files with 8 additions and 7 deletions
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15
driver.c
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@ -494,7 +494,8 @@ static void compute_monitor_fps_statistics(void)
{ {
if (g_extern.measure_data.frame_time_samples_count < 2 * MEASURE_FRAME_TIME_SAMPLES_COUNT) if (g_extern.measure_data.frame_time_samples_count < 2 * MEASURE_FRAME_TIME_SAMPLES_COUNT)
{ {
RARCH_LOG("Does not have enough samples for monitor refresh rate estimation.\n"); RARCH_LOG("Does not have enough samples for monitor refresh rate estimation. Requires to run for at least %u frames.\n",
2 * MEASURE_FRAME_TIME_SAMPLES_COUNT);
return; return;
} }
@ -502,30 +503,30 @@ static void compute_monitor_fps_statistics(void)
// Measure statistics on frame time (microsecs), *not* FPS. // Measure statistics on frame time (microsecs), *not* FPS.
rarch_time_t accum = 0; rarch_time_t accum = 0;
for (unsigned i = 1; i < samples; i++) for (unsigned i = 0; i < samples; i++)
accum += g_extern.measure_data.frame_time_samples[i]; accum += g_extern.measure_data.frame_time_samples[i];
#if 0 #if 0
for (unsigned i = 1; i < samples; i++) for (unsigned i = 0; i < samples; i++)
RARCH_LOG("Interval #%u: %d usec / frame.\n", RARCH_LOG("Interval #%u: %d usec / frame.\n",
i, (int)g_extern.measure_data.frame_time_samples[i]); i, (int)g_extern.measure_data.frame_time_samples[i]);
#endif #endif
rarch_time_t avg = accum / (samples - 1); rarch_time_t avg = accum / samples;
rarch_time_t accum_var = 0; rarch_time_t accum_var = 0;
// Drop first measurement. It is likely to be bad. // Drop first measurement. It is likely to be bad.
for (unsigned i = 1; i < samples; i++) for (unsigned i = 0; i < samples; i++)
{ {
rarch_time_t diff = g_extern.measure_data.frame_time_samples[i] - avg; rarch_time_t diff = g_extern.measure_data.frame_time_samples[i] - avg;
accum_var += diff * diff; accum_var += diff * diff;
} }
double stddev = sqrt((double)accum_var / (samples - 2)); double stddev = sqrt((double)accum_var / (samples - 1));
double avg_fps = 1000000.0 / avg; double avg_fps = 1000000.0 / avg;
RARCH_LOG("Average monitor Hz: %.6f Hz. (%.3f %% frame time deviation, based on %u last samples).\n", RARCH_LOG("Average monitor Hz: %.6f Hz. (%.3f %% frame time deviation, based on %u last samples).\n",
avg_fps, 100.0 * stddev / avg, samples - 1); avg_fps, 100.0 * stddev / avg, samples);
} }
void uninit_audio(void) void uninit_audio(void)