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comparison gldragon.cpp @ 89:ff739727dfec

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Compute and display frametime jitter values.
author Matti Hamalainen <ccr@tnsp.org>
date Sat, 31 Oct 2020 18:14:17 +0200
parents 8b34eab13549
children 28dd29f3a65f
comparison
equal deleted inserted replaced
88:8b34eab13549 89:ff739727dfec
92 } 92 }
93 93
94 94
95 int main(int argc, char *argv[]) 95 int main(int argc, char *argv[])
96 { 96 {
97 int frameDeltas[SET_FRAMES + 1];
98
97 bool 99 bool
98 exitFlag = false, 100 exitFlag = false,
99 pauseFlag = false, 101 pauseFlag = false,
100 optShowHelp = false, 102 optShowHelp = false,
101 optSetInputFilename = false, 103 optSetInputFilename = false,
111 DMSimpleScene scene; 113 DMSimpleScene scene;
112 int cycleTime = 0, 114 int cycleTime = 0,
113 cycleFrames = 0, 115 cycleFrames = 0,
114 totalTime = 0, 116 totalTime = 0,
115 totalFrames = 0; 117 totalFrames = 0;
118
119 memset(&frameDeltas, 0, sizeof(frameDeltas));
116 120
117 // Check commandline argument for enabling shaders 121 // Check commandline argument for enabling shaders
118 for (int narg = 1; narg < argc; narg++) 122 for (int narg = 1; narg < argc; narg++)
119 { 123 {
120 char *arg = argv[narg]; 124 char *arg = argv[narg];
348 // Check for errors 352 // Check for errors
349 renderer.checkErrors(); 353 renderer.checkErrors();
350 354
351 frameDelta = frameEnd - frameStart; 355 frameDelta = frameEnd - frameStart;
352 356
357
353 // Return true if a full rotation was done 358 // Return true if a full rotation was done
354 if (!pauseFlag) 359 if (!pauseFlag)
355 { 360 {
356 totalFrames++; 361 totalFrames++;
357 cycleFrames++; 362 cycleFrames++;
358 363
359 cycleTime += frameDelta; 364 cycleTime += frameDelta;
360 totalTime += frameDelta; 365 totalTime += frameDelta;
361 366
367 memmove(&frameDeltas[0], &frameDeltas[1], sizeof(frameDeltas[0]) * (SET_FRAMES - 1));
368 frameDeltas[SET_FRAMES - 1] = frameDelta;
369
362 if (cycleFrames >= SET_FRAMES) 370 if (cycleFrames >= SET_FRAMES)
363 { 371 {
372 float avgCycleFrame = cycleTime / SET_FRAMES;
373 float maxJitter = 0, avgJitter = 0;
374
375 for (int n = 0; n < SET_FRAMES; n++)
376 {
377 float mjitter = fabs(avgCycleFrame - frameDeltas[n]);
378 if (mjitter > maxJitter)
379 maxJitter = mjitter;
380 avgJitter += mjitter;
381 }
382
383 avgJitter /= SET_FRAMES;
384
364 // Print the current frames per second 385 // Print the current frames per second
365 printf("%d ms for %d frames = %.1lf FPS\n", 386 printf("%d ms for %d frames = %.1lf FPS [framejitter %.1lf ms avg, %.1lf ms max]\n",
366 cycleTime, cycleFrames, (cycleFrames * 1000.0f) / cycleTime); 387 cycleTime, cycleFrames,
388 (cycleFrames * 1000.0f) / cycleTime,
389 avgJitter, maxJitter
390 );
367 391
368 // Reset cycleFrames 392 // Reset cycleFrames
369 cycleFrames = 0; 393 cycleFrames = 0;
370 cycleTime = 0; 394 cycleTime = 0;
371 } 395 }