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/**
* Utility for getting OpenGL extension function pointers
* Meant to be #included.
*/
/* OpenGL 2.0 */
static PFNGLATTACHSHADERPROC glAttachShader_func = NULL;
static PFNGLBINDATTRIBLOCATIONPROC glBindAttribLocation_func = NULL;
static PFNGLCOMPILESHADERPROC glCompileShader_func = NULL;
static PFNGLCREATEPROGRAMPROC glCreateProgram_func = NULL;
static PFNGLCREATESHADERPROC glCreateShader_func = NULL;
static PFNGLDELETEPROGRAMPROC glDeleteProgram_func = NULL;
static PFNGLDELETESHADERPROC glDeleteShader_func = NULL;
static PFNGLGETATTACHEDSHADERSPROC glGetAttachedShaders_func = NULL;
static PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation_func = NULL;
static PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog_func = NULL;
static PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog_func = NULL;
static PFNGLGETSHADERIVPROC glGetShaderiv_func = NULL;
static PFNGLGETPROGRAMIVPROC glGetProgramiv_func = NULL;
static PFNGLGETSHADERSOURCEPROC glGetShaderSource_func = NULL;
static PFNGLGETUNIFORMFVPROC glGetUniformfv_func = NULL;
static PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation_func = NULL;
static PFNGLISPROGRAMPROC glIsProgram_func = NULL;
static PFNGLISSHADERPROC glIsShader_func = NULL;
static PFNGLLINKPROGRAMPROC glLinkProgram_func = NULL;
static PFNGLSHADERSOURCEPROC glShaderSource_func = NULL;
static PFNGLUNIFORM1IPROC glUniform1i_func = NULL;
static PFNGLUNIFORM1FVPROC glUniform1fv_func = NULL;
static PFNGLUNIFORM2FVPROC glUniform2fv_func = NULL;
static PFNGLUNIFORM3FVPROC glUniform3fv_func = NULL;
static PFNGLUNIFORM4FVPROC glUniform4fv_func = NULL;
static PFNGLUNIFORMMATRIX2FVPROC glUniformMatrix2fv_func = NULL;
static PFNGLUNIFORMMATRIX3FVPROC glUniformMatrix3fv_func = NULL;
static PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv_func = NULL;
static PFNGLUSEPROGRAMPROC glUseProgram_func = NULL;
static PFNGLVERTEXATTRIB1FPROC glVertexAttrib1f_func = NULL;
static PFNGLVERTEXATTRIB2FPROC glVertexAttrib2f_func = NULL;
static PFNGLVERTEXATTRIB3FPROC glVertexAttrib3f_func = NULL;
static PFNGLVERTEXATTRIB4FPROC glVertexAttrib4f_func = NULL;
/* GL_ARB_vertex/fragment_program */
static PFNGLBINDPROGRAMARBPROC glBindProgramARB_func = NULL;
static PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB_func = NULL;
static PFNGLGENPROGRAMSARBPROC glGenProgramsARB_func = NULL;
static PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC glGetProgramLocalParameterdvARB_func = NULL;
static PFNGLISPROGRAMARBPROC glIsProgramARB_func = NULL;
static PFNGLPROGRAMLOCALPARAMETER4DARBPROC glProgramLocalParameter4dARB_func = NULL;
static PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB_func = NULL;
static PFNGLPROGRAMSTRINGARBPROC glProgramStringARB_func = NULL;
static PFNGLVERTEXATTRIB1FARBPROC glVertexAttrib1fARB_func = NULL;
/* GL_APPLE_vertex_array_object */
static PFNGLBINDVERTEXARRAYAPPLEPROC glBindVertexArrayAPPLE_func = NULL;
static PFNGLDELETEVERTEXARRAYSAPPLEPROC glDeleteVertexArraysAPPLE_func = NULL;
static PFNGLGENVERTEXARRAYSAPPLEPROC glGenVertexArraysAPPLE_func = NULL;
static PFNGLISVERTEXARRAYAPPLEPROC glIsVertexArrayAPPLE_func = NULL;
static void
GetExtensionFuncs(void)
{
/* OpenGL 2.0 */
glAttachShader_func = (PFNGLATTACHSHADERPROC) glutGetProcAddress("glAttachShader");
glBindAttribLocation_func = (PFNGLBINDATTRIBLOCATIONPROC) glutGetProcAddress("glBindAttribLocation");
glCompileShader_func = (PFNGLCOMPILESHADERPROC) glutGetProcAddress("glCompileShader");
glCreateProgram_func = (PFNGLCREATEPROGRAMPROC) glutGetProcAddress("glCreateProgram");
glCreateShader_func = (PFNGLCREATESHADERPROC) glutGetProcAddress("glCreateShader");
glDeleteProgram_func = (PFNGLDELETEPROGRAMPROC) glutGetProcAddress("glDeleteProgram");
glDeleteShader_func = (PFNGLDELETESHADERPROC) glutGetProcAddress("glDeleteShader");
glGetAttachedShaders_func = (PFNGLGETATTACHEDSHADERSPROC) glutGetProcAddress("glGetAttachedShaders");
glGetAttribLocation_func = (PFNGLGETATTRIBLOCATIONPROC) glutGetProcAddress("glGetAttribLocation");
glGetProgramInfoLog_func = (PFNGLGETPROGRAMINFOLOGPROC) glutGetProcAddress("glGetProgramInfoLog");
glGetShaderInfoLog_func = (PFNGLGETSHADERINFOLOGPROC) glutGetProcAddress("glGetShaderInfoLog");
glGetProgramiv_func = (PFNGLGETPROGRAMIVPROC) glutGetProcAddress("glGetProgramiv");
glGetShaderiv_func = (PFNGLGETSHADERIVPROC) glutGetProcAddress("glGetShaderiv");
glGetShaderSource_func = (PFNGLGETSHADERSOURCEPROC) glutGetProcAddress("glGetShaderSource");
glGetUniformLocation_func = (PFNGLGETUNIFORMLOCATIONPROC) glutGetProcAddress("glGetUniformLocation");
glGetUniformfv_func = (PFNGLGETUNIFORMFVPROC) glutGetProcAddress("glGetUniformfv");
glIsProgram_func = (PFNGLISPROGRAMPROC) glutGetProcAddress("glIsProgram");
glIsShader_func = (PFNGLISSHADERPROC) glutGetProcAddress("glIsShader");
glLinkProgram_func = (PFNGLLINKPROGRAMPROC) glutGetProcAddress("glLinkProgram");
glShaderSource_func = (PFNGLSHADERSOURCEPROC) glutGetProcAddress("glShaderSource");
glUniform1i_func = (PFNGLUNIFORM1IPROC) glutGetProcAddress("glUniform1i");
glUniform1fv_func = (PFNGLUNIFORM1FVPROC) glutGetProcAddress("glUniform1fv");
glUniform2fv_func = (PFNGLUNIFORM2FVPROC) glutGetProcAddress("glUniform2fv");
glUniform3fv_func = (PFNGLUNIFORM3FVPROC) glutGetProcAddress("glUniform3fv");
glUniform4fv_func = (PFNGLUNIFORM3FVPROC) glutGetProcAddress("glUniform4fv");
glUniformMatrix2fv_func = (PFNGLUNIFORMMATRIX2FVPROC) glutGetProcAddress("glUniformMatrix2fv");
glUniformMatrix3fv_func = (PFNGLUNIFORMMATRIX3FVPROC) glutGetProcAddress("glUniformMatrix3fv");
glUniformMatrix4fv_func = (PFNGLUNIFORMMATRIX4FVPROC) glutGetProcAddress("glUniformMatrix4fv");
glUseProgram_func = (PFNGLUSEPROGRAMPROC) glutGetProcAddress("glUseProgram");
glVertexAttrib1f_func = (PFNGLVERTEXATTRIB1FPROC) glutGetProcAddress("glVertexAttrib1f");
glVertexAttrib2f_func = (PFNGLVERTEXATTRIB2FPROC) glutGetProcAddress("glVertexAttrib2f");
glVertexAttrib3f_func = (PFNGLVERTEXATTRIB3FPROC) glutGetProcAddress("glVertexAttrib3f");
glVertexAttrib4f_func = (PFNGLVERTEXATTRIB4FPROC) glutGetProcAddress("glVertexAttrib4f");
/* GL_ARB_vertex/fragment_program */
glBindProgramARB_func = (PFNGLBINDPROGRAMARBPROC) glutGetProcAddress("glBindProgramARB");
glDeleteProgramsARB_func = (PFNGLDELETEPROGRAMSARBPROC) glutGetProcAddress("glDeleteProgramsARB");
glGenProgramsARB_func = (PFNGLGENPROGRAMSARBPROC) glutGetProcAddress("glGenProgramsARB");
glGetProgramLocalParameterdvARB_func = (PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC) glutGetProcAddress("glGetProgramLocalParameterdvARB");
glIsProgramARB_func = (PFNGLISPROGRAMARBPROC) glutGetProcAddress("glIsProgramARB");
glProgramLocalParameter4dARB_func = (PFNGLPROGRAMLOCALPARAMETER4DARBPROC) glutGetProcAddress("glProgramLocalParameter4dARB");
glProgramLocalParameter4fvARB_func = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC) glutGetProcAddress("glProgramLocalParameter4fvARB");
glProgramStringARB_func = (PFNGLPROGRAMSTRINGARBPROC) glutGetProcAddress("glProgramStringARB");
glVertexAttrib1fARB_func = (PFNGLVERTEXATTRIB1FARBPROC) glutGetProcAddress("glVertexAttrib1fARB");
/* GL_APPLE_vertex_array_object */
glBindVertexArrayAPPLE_func = (PFNGLBINDVERTEXARRAYAPPLEPROC) glutGetProcAddress("glBindVertexArrayAPPLE");
glDeleteVertexArraysAPPLE_func = (PFNGLDELETEVERTEXARRAYSAPPLEPROC) glutGetProcAddress("glDeleteVertexArraysAPPLE");
glGenVertexArraysAPPLE_func = (PFNGLGENVERTEXARRAYSAPPLEPROC) glutGetProcAddress("glGenVertexArraysAPPLE");
glIsVertexArrayAPPLE_func = (PFNGLISVERTEXARRAYAPPLEPROC) glutGetProcAddress("glIsVertexArrayAPPLE");
}
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