Demos (master): egl/openvg: Print FPS for lion.

[Chia-I Wu]

Module: Demos
Branch: master
Commit: b9a2844609a700b61f22c1c17a908237acf6c5a5
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=b9a2844609a700b61f22c1c17a908237acf6c5a5

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Fri Dec  3 13:03:57 2010 +0800

egl/openvg: Print FPS for lion.

---

 src/egl/openvg/lion.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/src/egl/openvg/lion.c b/src/egl/openvg/lion.c
index c5dba4f..bb80ce7 100644
--- a/src/egl/openvg/lion.c
+++ b/src/egl/openvg/lion.c
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <VG/openvg.h>
 #include <EGL/egl.h>
 
@@ -11,6 +12,10 @@ VGfloat angle = 0;
 static void
 draw(void)
 {
+   static double t0 = -1.0;
+   static int num_frames;
+   double now;
+
    vgClear(0, 0, width, height);
 
    vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);
@@ -20,6 +25,23 @@ draw(void)
    vgTranslate(-width/2, -height/2);
 
    lion_render(lion);
+   vgFlush();
+   num_frames++;
+
+   if (t0 < 0.0) {
+      t0 = eglutGet(EGLUT_ELAPSED_TIME) / 1000.0;
+      num_frames = 0;
+   }
+
+   now = eglutGet(EGLUT_ELAPSED_TIME) / 1000.0;
+   if (now - t0 > 5.0) {
+      /* just a rough estimate */
+      printf("%d frames in %3.1f seconds = %6.3f FPS\n",
+            num_frames, now - t0, num_frames / (now - t0));
+
+      t0 = now;
+      num_frames = 0;
+   }
 
    ++angle;
    eglutPostRedisplay();