X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=freeglut-1.3%2Ffreeglut_display.c;h=d6ce1cb76d9797873e45bf08b504014618f47787;hb=9d66916bab11e22ff2b670638be3a50e604897a1;hp=91f6b6a7bae81c71083b6aaf41a7c80a480870a0;hpb=325b6327a5df4c476789ac5a329031677f3ca59b;p=freeglut

diff --git a/freeglut-1.3/freeglut_display.c b/freeglut-1.3/freeglut_display.c
index 91f6b6a..d6ce1cb 100644
--- a/freeglut-1.3/freeglut_display.c
+++ b/freeglut-1.3/freeglut_display.c
@@ -7,10 +7,6 @@
  * Written by Pawel W. Olszta, <olszta@sourceforge.net>
  * Creation date: Fri Dec 3 1999
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
@@ -78,6 +74,11 @@ void FGAPIENTRY glutSwapBuffers( void )
      */
     glFlush();
 
+    /*
+     * 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
@@ -91,6 +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 = 0.001 * (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;
+        }
+    }
 }
 
 /*