progs/demos: add fps output to cubemap

diff --git a/progs/demos/cubemap.c b/progs/demos/cubemap.c
index 1f9f2905759ae1e8ff91d20ed468c86aa615abe7..0a3e10dac08b4bf8fac8329c0ad7d6893b18c55a 100644 (file)
--- a/progs/demos/cubemap.c
+++ b/progs/demos/cubemap.c
@@ -53,6 +53,8 @@ static GLint FrameParity = 0;
 static GLenum FilterIndex = 0;
 static GLint ClampIndex = 0;
 static GLboolean supportFBO = GL_FALSE;
+static GLint T0 = 0;
+static GLint Frames = 0;
 
 
 static struct {
@@ -268,6 +270,20 @@ static void draw( void )
    glPopMatrix();
 
    glutSwapBuffers();
+
+   Frames++;
+
+   {
+      GLint t = glutGet(GLUT_ELAPSED_TIME);
+      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;
+      }
+   }
 }