| 1 | /* $Id: glut_mesa.c,v 1.2 2000-02-09 08:46:14 jeroen Exp $ */
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| 2 | /* Copyright (c) Mark J. Kilgard, 1996. */
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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 <stdlib.h>
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| 9 | #include <string.h>
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| 10 | #include "glutint.h"
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| 11 |
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| 12 | int __glutMesaSwapHackSupport = 0; /* Not supported until
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| 13 | proven otherwise. */
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| 14 |
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| 15 | /* Use the "Mesa swap hack" if reasonable if and only if
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| 16 | MESA_SWAP_HACK is set to something whose first character is
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| 17 | not "N" or "n" AND "Brian Paul" is the vendor string AND
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| 18 | "Mesa X11"* (or "Mesa" for backward compatibility) is the
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| 19 | renderer string.
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| 20 |
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| 21 | Anyone who modifies Mesa so that glXSwapBuffers does not
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| 22 | simply blit the previously rendered back buffer should
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| 23 | change either their vendor or renderer string to avoid
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| 24 | confusing GLUT. */
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| 25 |
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| 26 | void
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| 27 | __glutDetermineMesaSwapHackSupport(void)
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| 28 | {
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| 29 | static int doneAlready = 0;
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| 30 | char *env, *vendor, *renderer;
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| 31 |
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| 32 | /*#ifdef __WIN32OS2__
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| 33 | __glutMesaSwapHackSupport=1;
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| 34 | return;
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| 35 | #endif*/
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| 36 |
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| 37 | if (doneAlready)
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| 38 | return;
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| 39 | env = getenv("MESA_SWAP_HACK");
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| 40 | if (env) {
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| 41 | if ((env[0] != 'n') && (env[0] != 'N')) {
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| 42 | vendor = (char *) glGetString(GL_VENDOR);
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| 43 | renderer = (char *) glGetString(GL_RENDERER);
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| 44 |
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| 45 | /* Old versions of X11 Mesa uses the renderer string
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| 46 | "Mesa"; Brian plans to start using "Mesa X11" to
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| 47 | distinguish the X version of Mesa from other flavor
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| 48 | such as Windows or 3Dfx. */
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| 49 |
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| 50 | #define MESA_X11 "Mesa X11"
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| 51 |
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| 52 | /* XXX At some point in the future, eliminate the
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| 53 | backward compatibility for the old "Mesa" renderer
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| 54 | string. */
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| 55 |
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| 56 | if (!strcmp(vendor, "Brian Paul") && (!strcmp(renderer, "Mesa") ||
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| 57 | !strncmp(renderer, MESA_X11, sizeof(MESA_X11) - 1)))
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| 58 | __glutMesaSwapHackSupport = 1;
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| 59 | }
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| 60 | }
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| 61 | doneAlready = 1;
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| 62 | }
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