PFNGLCREATEPROGRAMPROC glCreateProgram =NULL;
 PFNGLDELETEPROGRAMPROC glDeleteProgram =NULL;
 PFNGLUSEPROGRAMPROC glUseProgram =NULL;
 PFNGLATTACHSHADERPROC glAttachShader =NULL;
 PFNGLDETACHSHADERPROC glDetachShader =NULL;
 PFNGLLINKPROGRAMPROC glLinkProgram =NULL;
 PFNGLGETPROGRAMIVPROC glGetProgramiv =NULL;
 PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog =NULL;
 PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation =NULL;
 PFNGLUNIFORM1IPROC glUniform1i =NULL;
 PFNGLUNIFORM1IVPROC glUniform1iv =NULL;
 PFNGLUNIFORM2IVPROC glUniform2iv =NULL;
 PFNGLUNIFORM3IVPROC glUniform3iv =NULL;
 PFNGLUNIFORM4IVPROC glUniform4iv =NULL;
 PFNGLUNIFORM1FPROC glUniform1f =NULL;
 PFNGLUNIFORM1FVPROC glUniform1fv =NULL;
 PFNGLUNIFORM2FVPROC glUniform2fv =NULL;
 PFNGLUNIFORM3FVPROC glUniform3fv =NULL;
 PFNGLUNIFORM4FVPROC glUniform4fv =NULL;
 PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv =NULL;
 PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation =NULL;
 PFNGLVERTEXATTRIB1FPROC glVertexAttrib1f =NULL;
 PFNGLVERTEXATTRIB1FVPROC glVertexAttrib1fv =NULL;
 PFNGLVERTEXATTRIB2FVPROC glVertexAttrib2fv =NULL;
 PFNGLVERTEXATTRIB3FVPROC glVertexAttrib3fv =NULL;
 PFNGLVERTEXATTRIB4FVPROC glVertexAttrib4fv =NULL;
 PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray =NULL;
 PFNGLBINDATTRIBLOCATIONPROC glBindAttribLocation =NULL;

// Shader
 PFNGLCREATESHADERPROC glCreateShader =NULL;
 PFNGLDELETESHADERPROC glDeleteShader =NULL;
 PFNGLSHADERSOURCEPROC glShaderSource =NULL;
 PFNGLCOMPILESHADERPROC glCompileShader =NULL;
 PFNGLGETSHADERIVPROC glGetShaderiv =NULL;

// VBO
 PFNGLGENBUFFERSPROC glGenBuffers =NULL;
 PFNGLBINDBUFFERPROC	glBindBuffer =NULL;
 PFNGLBUFFERDATAPROC	glBufferData =NULL;
 PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer =NULL;
 PFNGLGENVERTEXARRAYSPROC glGenVertexArrays =NULL;
 PFNGLBINDVERTEXARRAYPROC glBindVertexArray =NULL;
 PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays =NULL;
 PFNGLDISABLEVERTEXATTRIBARRAYPROC glDisableVertexAttribArray =NULL;
 PFNGLDELETEBUFFERSPROC glDeleteBuffers =NULL;
 
 //Uniform
 PFNGLBINDBUFFERRANGEPROC glBindBufferRange = NULL;
 PFNGLGETUNIFORMBLOCKINDEXPROC glGetUniformBlockIndex = NULL;
 PFNGLMAPBUFFERRANGEPROC glMapBufferRange = NULL;
 PFNGLFLUSHMAPPEDBUFFERRANGEPROC glFlushMappedBufferRange = NULL;
 PFNGLUNMAPBUFFERPROC glUnmapBuffer = NULL;
 PFNGLUNIFORMBLOCKBINDINGPROC glUniformBlockBinding = NULL;
 //PFNGLGETUNIFORMINDICES