| 1 | /* $Id: glut_swap.c,v 1.2 2000-02-09 08:46:17 jeroen Exp $ */
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| 2 | /* Copyright (c) Mark J. Kilgard, 1994, 1997. */
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| 3 |
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| 4 | /* This program is freely distributable without licensing fees
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| 5 | and is provided without guarantee or warrantee expressed or
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| 6 | implied. This program is -not- in the public domain. */
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| 7 |
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| 8 | #include "glutint.h"
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| 9 |
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| 10 | /* CENTRY */
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| 11 | void APIENTRY
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| 12 | glutSwapBuffers(void)
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| 13 | {
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| 14 | GLUTwindow *window = __glutCurrentWindow;
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| 15 |
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| 16 | if (window->renderWin == window->win) {
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| 17 | if (__glutCurrentWindow->treatAsSingle) {
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| 18 | /* Pretend the double buffered window is single buffered,
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| 19 | so treat glutSwapBuffers as a no-op. */
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| 20 | return;
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| 21 | }
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| 22 | } else {
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| 23 | if (__glutCurrentWindow->overlay->treatAsSingle) {
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| 24 | /* Pretend the double buffered overlay is single
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| 25 | buffered, so treat glutSwapBuffers as a no-op. */
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| 26 | return;
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | /* For the MESA_SWAP_HACK. */
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| 31 | window->usedSwapBuffers = 1;
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| 32 |
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| 33 | SWAP_BUFFERS_LAYER(__glutCurrentWindow);
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| 34 |
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| 35 | /* I considered putting the window being swapped on the
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| 36 | GLUT_FINISH_WORK work list because you could call
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| 37 | glutSwapBuffers from an idle callback which doesn't call
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| 38 | __glutSetWindow which normally adds indirect rendering
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| 39 | windows to the GLUT_FINISH_WORK work list. Not being put
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| 40 | on the list could lead to the buffering up of multiple
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| 41 | redisplays and buffer swaps and hamper interactivity. I
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| 42 | consider this an application bug due to not using
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| 43 | glutPostRedisplay to trigger redraws. If
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| 44 | glutPostRedisplay were used, __glutSetWindow would be
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| 45 | called and a glFinish to throttle buffering would occur. */
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| 46 | }
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| 47 | /* ENDCENTRY */
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