diff options
| -rw-r--r-- | progs/demos/engine.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/progs/demos/engine.c b/progs/demos/engine.c index af437e2f141..3cf311e7782 100644 --- a/progs/demos/engine.c +++ b/progs/demos/engine.c @@ -964,6 +964,28 @@ Draw(void) glEnable(GL_TEXTURE_2D); } + /* also print out a periodic fps to stdout. useful for trying to + * figure out the performance impact of rendering the string above + * with glBitmap. + */ + { + static GLint T0 = 0; + static GLint Frames = 0; + GLint t = glutGet(GLUT_ELAPSED_TIME); + + Frames++; + + if (t - T0 >= 5000) { + GLfloat seconds = (t - T0) / 1000.0; + GLfloat fps = Frames / seconds; + printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps); + fflush(stdout); + T0 = t; + Frames = 0; + } + } + + glutSwapBuffers(); } |