| |
| /* 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. */ |
| |
| #include <stdio.h> |
| #include "glutint.h" |
| |
| GLint __glutFPS = 0; |
| GLint __glutSwapCount = 0; |
| GLint __glutSwapTime = 0; |
| |
| /* CENTRY */ |
| void GLUTAPIENTRY |
| glutSwapBuffers(void) |
| { |
| GLUTwindow *window = __glutCurrentWindow; |
| |
| if (window->renderWin == window->win) { |
| if (__glutCurrentWindow->treatAsSingle) { |
| /* Pretend the double buffered window is single buffered, |
| so treat glutSwapBuffers as a no-op. */ |
| return; |
| } |
| } else { |
| if (__glutCurrentWindow->overlay->treatAsSingle) { |
| /* Pretend the double buffered overlay is single |
| buffered, so treat glutSwapBuffers as a no-op. */ |
| return; |
| } |
| } |
| |
| /* For the MESA_SWAP_HACK. */ |
| window->usedSwapBuffers = 1; |
| |
| SWAP_BUFFERS_LAYER(__glutCurrentWindow); |
| |
| /* I considered putting the window being swapped on the |
| GLUT_FINISH_WORK work list because you could call |
| glutSwapBuffers from an idle callback which doesn't call |
| __glutSetWindow which normally adds indirect rendering |
| windows to the GLUT_FINISH_WORK work list. Not being put |
| on the list could lead to the buffering up of multiple |
| redisplays and buffer swaps and hamper interactivity. I |
| consider this an application bug due to not using |
| glutPostRedisplay to trigger redraws. If |
| glutPostRedisplay were used, __glutSetWindow would be |
| called and a glFinish to throttle buffering would occur. */ |
| |
| if (__glutFPS) { |
| GLint t = glutGet(GLUT_ELAPSED_TIME); |
| __glutSwapCount++; |
| if (__glutSwapTime == 0) |
| __glutSwapTime = t; |
| else if (t - __glutSwapTime > __glutFPS) { |
| float time = 0.001 * (t - __glutSwapTime); |
| float fps = (float) __glutSwapCount / time; |
| fprintf(stderr, "GLUT: %d frames in %.2f seconds = %.2f FPS\n", |
| __glutSwapCount, time, fps); |
| __glutSwapTime = t; |
| __glutSwapCount = 0; |
| } |
| } |
| } |
| /* ENDCENTRY */ |
