mirror of
https://github.com/nigels-com/glew.git
synced 2025-12-23 15:33:17 +00:00
54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
/* ------------------------------------------------------------------------- */
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static PFNWGLGETEXTENSIONSSTRINGARBPROC _wglewGetExtensionsStringARB = NULL;
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static PFNWGLGETEXTENSIONSSTRINGEXTPROC _wglewGetExtensionsStringEXT = NULL;
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typedef HDC (WINAPI * PFNWGLGETCURRENTDCPROCPTR) (void);
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static PFNWGLGETCURRENTDCPROCPTR _wglewGetCurrentDC = NULL;
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GLboolean GLEWAPIENTRY wglewGetExtension (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 (_wglewGetCurrentDC == NULL)
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return GL_FALSE;
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if (_wglewGetExtensionsStringARB == NULL)
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if (_wglewGetExtensionsStringEXT == NULL)
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return GL_FALSE;
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else
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start = (const GLubyte*)_wglewGetExtensionsStringEXT();
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else
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start = (const GLubyte*)_wglewGetExtensionsStringARB(_wglewGetCurrentDC());
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if (start == 0)
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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 GLEWAPIENTRY wglewInit (void)
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{
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GLboolean crippled;
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const GLubyte* extStart;
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const GLubyte* extEnd;
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_wglewGetCurrentDC = (PFNWGLGETCURRENTDCPROCPTR)glewGetProcAddress((const GLubyte*)"wglGetCurrentDC");
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if (_wglewGetCurrentDC == NULL)
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return GLEW_ERROR_NO_GL_VERSION;
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/* find wgl extension string query functions */
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_wglewGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)glewGetProcAddress((const GLubyte*)"wglGetExtensionsStringARB");
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_wglewGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)glewGetProcAddress((const GLubyte*)"wglGetExtensionsStringEXT");
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/* query wgl extension string */
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if (_wglewGetExtensionsStringARB == NULL)
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if (_wglewGetExtensionsStringEXT == NULL)
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extStart = (const GLubyte*)"";
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else
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extStart = (const GLubyte*)_wglewGetExtensionsStringEXT();
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else
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extStart = (const GLubyte*)_wglewGetExtensionsStringARB(_wglewGetCurrentDC());
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extEnd = extStart + _glewStrLen(extStart);
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/* initialize extensions */
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crippled = _wglewGetExtensionsStringARB == NULL && _wglewGetExtensionsStringEXT == NULL;
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