simple extension function wrangler
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/**
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* Utility for getting OpenGL extension function pointers
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* Meant to be #included.
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*/
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/* OpenGL 2.0 */
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static PFNGLATTACHSHADERPROC glAttachShader_func = NULL;
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static PFNGLCOMPILESHADERPROC glCompileShader_func = NULL;
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static PFNGLCREATEPROGRAMPROC glCreateProgram_func = NULL;
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static PFNGLCREATESHADERPROC glCreateShader_func = NULL;
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static PFNGLDELETEPROGRAMPROC glDeleteProgram_func = NULL;
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static PFNGLDELETESHADERPROC glDeleteShader_func = NULL;
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static PFNGLGETATTACHEDSHADERSPROC glGetAttachedShaders_func = NULL;
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static PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog_func = NULL;
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static PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog_func = NULL;
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static PFNGLGETSHADERIVPROC glGetShaderiv_func = NULL;
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static PFNGLGETPROGRAMIVPROC glGetProgramiv_func = NULL;
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static PFNGLGETSHADERSOURCEPROC glGetShaderSource_func = NULL;
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static PFNGLGETUNIFORMFVPROC glGetUniformfv_func = NULL;
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static PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation_func = NULL;
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static PFNGLISPROGRAMPROC glIsProgram_func = NULL;
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static PFNGLISSHADERPROC glIsShader_func = NULL;
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static PFNGLLINKPROGRAMPROC glLinkProgram_func = NULL;
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static PFNGLSHADERSOURCEPROC glShaderSource_func = NULL;
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static PFNGLUNIFORM3FVPROC glUniform3fv_func = NULL;
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static PFNGLUNIFORM3FVPROC glUniform4fv_func = NULL;
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static PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv_func = NULL;
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static PFNGLUSEPROGRAMPROC glUseProgram_func = NULL;
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/* GL_ARB_vertex/fragment_program */
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static PFNGLBINDPROGRAMARBPROC glBindProgramARB_func = NULL;
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static PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB_func = NULL;
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static PFNGLGENPROGRAMSARBPROC glGenProgramsARB_func = NULL;
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static PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC glGetProgramLocalParameterdvARB_func = NULL;
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static PFNGLISPROGRAMARBPROC glIsProgramARB_func = NULL;
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static PFNGLPROGRAMLOCALPARAMETER4DARBPROC glProgramLocalParameter4dARB_func = NULL;
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static PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB_func = NULL;
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static PFNGLPROGRAMSTRINGARBPROC glProgramStringARB_func = NULL;
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static PFNGLVERTEXATTRIB1FARBPROC glVertexAttrib1fARB_func = NULL;
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/* GL_APPLE_vertex_array_object */
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static PFNGLBINDVERTEXARRAYAPPLEPROC glBindVertexArrayAPPLE_func = NULL;
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static PFNGLDELETEVERTEXARRAYSAPPLEPROC glDeleteVertexArraysAPPLE_func = NULL;
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static PFNGLGENVERTEXARRAYSAPPLEPROC glGenVertexArraysAPPLE_func = NULL;
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static PFNGLISVERTEXARRAYAPPLEPROC glIsVertexArrayAPPLE_func = NULL;
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static void
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GetExtensionFuncs(void)
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{
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/* OpenGL 2.0 */
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glAttachShader_func = (PFNGLATTACHSHADERPROC) glutGetProcAddress("glAttachShader");
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glCompileShader_func = (PFNGLCOMPILESHADERPROC) glutGetProcAddress("glCompileShader");
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glCreateProgram_func = (PFNGLCREATEPROGRAMPROC) glutGetProcAddress("glCreateProgram");
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glCreateShader_func = (PFNGLCREATESHADERPROC) glutGetProcAddress("glCreateShader");
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glDeleteProgram_func = (PFNGLDELETEPROGRAMPROC) glutGetProcAddress("glDeleteProgram");
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glDeleteShader_func = (PFNGLDELETESHADERPROC) glutGetProcAddress("glDeleteShader");
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glGetAttachedShaders_func = (PFNGLGETATTACHEDSHADERSPROC) glutGetProcAddress("glGetAttachedShaders");
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glGetProgramInfoLog_func = (PFNGLGETPROGRAMINFOLOGPROC) glutGetProcAddress("glGetProgramInfoLog");
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glGetShaderInfoLog_func = (PFNGLGETSHADERINFOLOGPROC) glutGetProcAddress("glGetShaderInfoLog");
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glGetProgramiv_func = (PFNGLGETPROGRAMIVPROC) glutGetProcAddress("glGetProgramiv");
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glGetShaderiv_func = (PFNGLGETSHADERIVPROC) glutGetProcAddress("glGetShaderiv");
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glGetShaderSource_func = (PFNGLGETSHADERSOURCEPROC) glutGetProcAddress("glGetShaderSource");
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glGetUniformLocation_func = (PFNGLGETUNIFORMLOCATIONPROC) glutGetProcAddress("glGetUniformLocation");
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glGetUniformfv_func = (PFNGLGETUNIFORMFVPROC) glutGetProcAddress("glGetUniformfv");
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glIsProgram_func = (PFNGLISPROGRAMPROC) glutGetProcAddress("glIsProgram");
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glIsShader_func = (PFNGLISSHADERPROC) glutGetProcAddress("glIsShader");
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glLinkProgram_func = (PFNGLLINKPROGRAMPROC) glutGetProcAddress("glLinkProgram");
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glShaderSource_func = (PFNGLSHADERSOURCEPROC) glutGetProcAddress("glShaderSource");
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glUniform3fv_func = (PFNGLUNIFORM3FVPROC) glutGetProcAddress("glUniform3fv");
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glUniform4fv_func = (PFNGLUNIFORM3FVPROC) glutGetProcAddress("glUniform4fv");
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glUniformMatrix4fv_func = (PFNGLUNIFORMMATRIX4FVPROC) glutGetProcAddress("glUniformMatrix4fv");
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glUseProgram_func = (PFNGLUSEPROGRAMPROC) glutGetProcAddress("glUseProgram");
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/* GL_ARB_vertex/fragment_program */
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glBindProgramARB_func = (PFNGLBINDPROGRAMARBPROC) glutGetProcAddress("glBindProgramARB");
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glDeleteProgramsARB_func = (PFNGLDELETEPROGRAMSARBPROC) glutGetProcAddress("glDeleteProgramsARB");
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glGenProgramsARB_func = (PFNGLGENPROGRAMSARBPROC) glutGetProcAddress("glGenProgramsARB");
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glGetProgramLocalParameterdvARB_func = (PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC) glutGetProcAddress("glGetProgramLocalParameterdvARB");
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glIsProgramARB_func = (PFNGLISPROGRAMARBPROC) glutGetProcAddress("glIsProgramARB");
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glProgramLocalParameter4dARB_func = (PFNGLPROGRAMLOCALPARAMETER4DARBPROC) glutGetProcAddress("glProgramLocalParameter4dARB");
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glProgramLocalParameter4fvARB_func = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC) glutGetProcAddress("glProgramLocalParameter4fvARB");
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glProgramStringARB_func = (PFNGLPROGRAMSTRINGARBPROC) glutGetProcAddress("glProgramStringARB");
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glVertexAttrib1fARB_func = (PFNGLVERTEXATTRIB1FARBPROC) glutGetProcAddress("glVertexAttrib1fARB");
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/* GL_APPLE_vertex_array_object */
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glBindVertexArrayAPPLE_func = (PFNGLBINDVERTEXARRAYAPPLEPROC) glutGetProcAddress("glBindVertexArrayAPPLE");
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glDeleteVertexArraysAPPLE_func = (PFNGLDELETEVERTEXARRAYSAPPLEPROC) glutGetProcAddress("glDeleteVertexArraysAPPLE");
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glGenVertexArraysAPPLE_func = (PFNGLGENVERTEXARRAYSAPPLEPROC) glutGetProcAddress("glGenVertexArraysAPPLE");
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glIsVertexArrayAPPLE_func = (PFNGLISVERTEXARRAYAPPLEPROC) glutGetProcAddress("glIsVertexArrayAPPLE");
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}
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