Doxygen Source Code Documentation
glut_ext.c File Reference
#include <string.h>#include <GL/glut.h>#include "glutint.h"Go to the source code of this file.
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| int | glutExtensionSupported (char *extension) |
| int | __glutIsSupportedByGLX (char *extension) |
Function Documentation
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Definition at line 47 of file glut_ext.c. Referenced by checkOverlayAcceptability(), getVisualInfoRGB(), and glutGet().
00048 {
00049 #if defined(GLX_VERSION_1_1)
00050 static const char *extensions = NULL;
00051 const char *start;
00052 char *where, *terminator;
00053 int major, minor;
00054
00055 glXQueryVersion(__glutDisplay, &major, &minor);
00056 /* Be careful not to call glXQueryExtensionsString if it
00057 looks like the server doesn't support GLX 1.1.
00058 Unfortunately, the original GLX 1.0 didn't have the notion
00059 of GLX extensions. */
00060 if ((major == 1 && minor >= 1) || (major > 1)) {
00061 if (!extensions)
00062 extensions = glXQueryExtensionsString(__glutDisplay, __glutScreen);
00063 /* It takes a bit of care to be fool-proof about parsing
00064 the GLX extensions string. Don't be fooled by
00065 sub-strings, etc. */
00066 start = extensions;
00067 for (;;) {
00068 where = strstr(start, extension);
00069 if (!where)
00070 return 0;
00071 terminator = where + strlen(extension);
00072 if (where == start || *(where - 1) == ' ') {
00073 if (*terminator == ' ' || *terminator == '\0') {
00074 return 1;
00075 }
00076 }
00077 start = terminator;
00078 }
00079 }
00080 #else
00081 /* No GLX extensions before GLX 1.1 */
00082 #endif
00083 return 0;
00084 }
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Definition at line 14 of file glut_ext.c.
00015 {
00016 static const GLubyte *extensions = NULL;
00017 const GLubyte *start;
00018 GLubyte *where, *terminator;
00019
00020 /* Extension names should not have spaces. */
00021 where = (GLubyte *) strchr(extension, ' ');
00022 if (where || *extension == '\0')
00023 return 0;
00024
00025 if (!extensions)
00026 extensions = glGetString(GL_EXTENSIONS);
00027 /* It takes a bit of care to be fool-proof about parsing the
00028 OpenGL extensions string. Don't be fooled by sub-strings,
00029 etc. */
00030 start = extensions;
00031 for (;;) {
00032 where = (GLubyte *) strstr((const char *)start, extension);
00033 if (!where)
00034 break;
00035 terminator = where + strlen(extension);
00036 if (where == start || *(where - 1) == ' ') {
00037 if (*terminator == ' ' || *terminator == '\0') {
00038 return 1;
00039 }
00040 }
00041 start = terminator;
00042 }
00043 return 0;
00044 }
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