mirror of
https://github.com/nigels-com/glew.git
synced 2024-11-24 23:05:06 +00:00
71 lines
3.0 KiB
C
71 lines
3.0 KiB
C
/* ------------------------------------------------------------------------- */
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GLboolean GLEWAPIENTRY glewGetExtension (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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start = (const GLubyte*)glGetString(GL_EXTENSIONS);
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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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/* ------------------------------------------------------------------------- */
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#ifndef GLEW_MX
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static
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#endif
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GLenum GLEWAPIENTRY glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
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{
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const GLubyte* s;
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GLuint dot;
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GLint major, minor;
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const GLubyte* extStart;
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const GLubyte* extEnd;
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/* query opengl version */
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s = glGetString(GL_VERSION);
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dot = _glewStrCLen(s, '.');
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if (dot == 0)
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return GLEW_ERROR_NO_GL_VERSION;
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major = s[dot-1]-'0';
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minor = s[dot+1]-'0';
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if (minor < 0 || minor > 9)
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minor = 0;
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if (major<0 || major>9)
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return GLEW_ERROR_NO_GL_VERSION;
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if (major == 1 && minor == 0)
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{
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return GLEW_ERROR_GL_VERSION_10_ONLY;
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}
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else
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{
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CONST_CAST(GLEW_VERSION_4_2) = ( major > 4 ) || ( major == 4 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_4_1) = GLEW_VERSION_4_2 == GL_TRUE || ( major == 4 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_4_0) = GLEW_VERSION_4_1 == GL_TRUE || ( major == 4 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_3_3) = GLEW_VERSION_4_0 == GL_TRUE || ( major == 3 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_3_2) = GLEW_VERSION_3_3 == GL_TRUE || ( major == 3 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_3_1) = GLEW_VERSION_3_2 == GL_TRUE || ( major == 3 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_3_0) = GLEW_VERSION_3_1 == GL_TRUE || ( major == 3 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_2_1) = GLEW_VERSION_3_0 == GL_TRUE || ( major == 2 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_2_0) = GLEW_VERSION_2_1 == GL_TRUE || ( major == 2 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_5) = GLEW_VERSION_2_0 == GL_TRUE || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_4) = GLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_3) = GLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_2_1) = GLEW_VERSION_1_3 == GL_TRUE ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_2) = GLEW_VERSION_1_2_1 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
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CONST_CAST(GLEW_VERSION_1_1) = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
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}
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/* query opengl extensions string */
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extStart = glGetString(GL_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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