/* Copyright (c) Mark J. Kilgard, 1994, 1997.  */

/* This program is freely distributable without licensing fees

   and is provided without guarantee or warrantee expressed or

   implied. This program is -not- in the public domain. */

#import "macx_glut.h"

#import "GLUTView.h"

GLint __glutFPS = 0;

static GLint __glutSwapCount = 0;

static GLint __glutSwapTime = 0;

/* CENTRY */

void APIENTRY glutSwapBuffers(void)

{

   if([__glutCurrentView isTreatAsSingle]) {

      /* Pretend the double buffered window is single buffered,

         so treat glutSwapBuffers as a no-op.

         Well, actually flush any graphic commands queued by

         the hardware accelerator or we won't see anything in

         the GLUT window... */

      glFlush();

      return;

   }

   SWAP_BUFFERS_WINDOW(__glutCurrentView);

   if (__glutFPS) {

      GLint t = glutGet(GLUT_ELAPSED_TIME);

      __glutSwapCount++;

      if (__glutSwapTime == 0)

         __glutSwapTime = t;

      else if (t - __glutSwapTime > __glutFPS) {

         float currTime = 0.001 * (t - __glutSwapTime);

         float fps = (float) __glutSwapCount / currTime;

         fprintf(stderr, "GLUT: %d frames in %.2f seconds = %.2f FPS\n",

                  (int) __glutSwapCount, currTime, fps);

         __glutSwapTime = t;

         __glutSwapCount = 0;

      }

   }

}

/* ENDCENTRY */