X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=freeglut-1.3%2Ffreeglut_display.c;h=de198415fce2791c47d98365ea99cd0697c270f8;hb=2c52e17121abf4888117ab6b1c94be48ebd569c5;hp=7f7e3c12d4fec9d18c8277a7dc520f820845cc5d;hpb=583baa8756a71ed088b8e46c52a945218037314c;p=freeglut

diff --git a/freeglut-1.3/freeglut_display.c b/freeglut-1.3/freeglut_display.c
index 7f7e3c1..de19841 100644
--- a/freeglut-1.3/freeglut_display.c
+++ b/freeglut-1.3/freeglut_display.c
@@ -74,12 +74,12 @@ void FGAPIENTRY glutSwapBuffers( void )
      */
     glFlush();
 
-#if TARGET_HOST_UNIX_X11
     /*
      * If it's single-buffered, we shouldn't be here.
      */
     if ( ! fgStructure.Window->Window.DoubleBuffered ) return ;
 
+#if TARGET_HOST_UNIX_X11
     /*
      * Issue the glXSwapBuffers call and be done with it
      */
@@ -92,6 +92,22 @@ void FGAPIENTRY glutSwapBuffers( void )
     SwapBuffers( fgStructure.Window->Window.Device );
 
 #endif
+
+    /* 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;
+        }
+    }
 }
 
 /*