mirror of
https://github.com/nigels-com/glew.git
synced 2025-04-20 23:52:55 +00:00
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* ------------------------------------------------------------------------ */
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PFNGLXQUERYVERSIONPROC __glewXQueryVersion = NULL;
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PFNGLXGETCLIENTSTRINGPROC __glewXGetClientString = NULL;
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static GLboolean _glewInit_GLX_VERSION_1_0 ()
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{
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GLboolean r = GL_FALSE;
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r = ((glXQueryVersion = (PFNGLXQUERYVERSIONPROC)glewGetProcAddress((const GLubyte*)"glXQueryVersion")) == NULL) || r;
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return r;
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}
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static GLboolean _glewInit_GLX_VERSION_1_1 ()
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{
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GLboolean r = GL_FALSE;
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r = ((glXGetClientString = (PFNGLXGETCLIENTSTRINGPROC)glewGetProcAddress((const GLubyte*)"glXGetClientString")) == NULL) || r;
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return r;
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}
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/* ------------------------------------------------------------------------ */
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GLboolean glxewGetExtension (const char* name)
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{
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const GLubyte* start;
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const GLubyte* end;
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if (glXGetCurrentDisplay == NULL) return GL_FALSE;
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start = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
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if (0 == start) return GL_FALSE;
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end = start + _glewStrLen(start);
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return _glewSearchExtension(name, start, end);
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}
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GLenum glxewInit ()
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{
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int major, minor;
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const GLubyte* extStart;
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const GLubyte* extEnd;
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if (_glewInit_GLX_VERSION_1_0() || _glewInit_GLX_VERSION_1_1())
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return GLEW_ERROR_GLX_VERSION_11_ONLY;
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/* initialize core GLX 1.2 */
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if (_glewInit_GLX_VERSION_1_2()) return GLEW_ERROR_GLX_VERSION_11_ONLY;
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/* initialize flags */
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GLXEW_VERSION_1_0 = GL_TRUE;
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GLXEW_VERSION_1_1 = GL_TRUE;
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GLXEW_VERSION_1_2 = GL_TRUE;
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GLXEW_VERSION_1_3 = GL_TRUE;
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GLXEW_VERSION_1_4 = GL_TRUE;
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/* query GLX version */
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glXQueryVersion(glXGetCurrentDisplay(), &major, &minor);
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if (major == 1 && minor <= 3)
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{
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switch (minor)
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{
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case 3:
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GLXEW_VERSION_1_4 = GL_FALSE;
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break;
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case 2:
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GLXEW_VERSION_1_4 = GL_FALSE;
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GLXEW_VERSION_1_3 = GL_FALSE;
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break;
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default:
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return GLEW_ERROR_GLX_VERSION_11_ONLY;
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break;
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}
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}
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/* query GLX extension string */
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extStart = 0;
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if (glXGetCurrentDisplay != NULL)
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extStart = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
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if (extStart == 0)
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extStart = (const GLubyte *)"";
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extEnd = extStart + _glewStrLen(extStart);
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/* initialize extensions */
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