+
+ /* GLUT_FPS env var support */
+ if (fgState.FPSInterval) {
+ GLint t = glutGet(GLUT_ELAPSED_TIME);
+ fgState.SwapCount++;
+ if (fgState.SwapTime == 0)
+ fgState.SwapTime = t;
+ else if (t - fgState.SwapTime > fgState.FPSInterval) {
+ float time = 0.001f * (t - fgState.SwapTime);
+ float fps = (float) fgState.SwapCount / time;
+ fprintf(stderr, "freeglut: %d frames in %.2f seconds = %.2f FPS\n",
+ fgState.SwapCount, time, fps);
+ fgState.SwapTime = t;
+ fgState.SwapCount = 0;
+ }
+ }