29     virtual void glGenBuffers_(GLsizei n, GLuint* buffers) override;
30     virtual void glGenFramebuffers_(GLsizei n, GLuint* framebuffers) override;
31     virtual void glGenRenderbuffers_(GLsizei n, GLuint* renderbuffers) override;
32     virtual void glGenTextures_(GLsizei n, GLuint* textures) override;
33     virtual GLuint glCreateProgram_(void) override;
34     virtual GLuint glCreateShader_(GLenum type) override;
35     virtual void glGetProgramiv_(GLuint program, GLenum pname, GLint* params) override;
36     virtual void glGetProgramInfoLog_(GLuint program, GLsizei bufSize, GLsizei* length,
38     virtual void glGetShaderiv_(GLuint shader, GLenum pname, GLint* params) override;
39     virtual void glGetShaderInfoLog_(GLuint shader, GLsizei bufSize, GLsizei* length,
49     virtual void glAttachShader_(GLuint program, GLuint shader) override {}  in glAttachShader_()
50     virtual void glBindAttribLocation_(GLuint program, GLuint index, const GLchar* name) override {}  in glBindAttribLocation_()
51     virtual void glBindBuffer_(GLenum target, GLuint buffer) override {}  in glBindBuffer_()
52     virtual void glBindFramebuffer_(GLenum target, GLuint framebuffer) override {}  in glBindFramebuffer_()
53     virtual void glBindRenderbuffer_(GLenum target, GLuint renderbuffer) override {}  in glBindRenderbuffer_()
54     virtual void glBindTexture_(GLenum target, GLuint texture) override {}  in glBindTexture_()
71     virtual void glCompileShader_(GLuint shader) override {}  in glCompileShader_()
84     virtual void glDeleteBuffers_(GLsizei n, const GLuint* buffers) override {}  in glDeleteBuffers_()
85     virtual void glDeleteFramebuffers_(GLsizei n, const GLuint* framebuffers) override {}  in glDeleteFramebuffers_()
86     virtual void glDeleteProgram_(GLuint program) override {}  in glDeleteProgram_()
87     virtual void glDeleteRenderbuffers_(GLsizei n, const GLuint* renderbuffers) override {}  in glDeleteRenderbuffers_()
88     virtual void glDeleteShader_(GLuint shader) override {}  in glDeleteShader_()
89     virtual void glDeleteTextures_(GLsizei n, const GLuint* textures) override {}  in glDeleteTextures_()
93     virtual void glDetachShader_(GLuint program, GLuint shader) override {}  in glDetachShader_()
94     virtual void glDisableVertexAttribArray_(GLuint index) override {}  in glDisableVertexAttribArray_()
98     virtual void glEnableVertexAttribArray_(GLuint index) override {}  in glEnableVertexAttribArray_()
103                                             GLuint renderbuffer) override {}  in glFramebufferRenderbuffer_()
105                                          GLuint texture, GLint level) override {}  in glFramebufferTexture2D_()
108     virtual GLint glGetAttribLocation_(GLuint program, const GLchar* name) override { return 1; }  in glGetAttribLocation_()
110     virtual GLint glGetUniformLocation_(GLuint program, const GLchar* name) override { return 2; }  in glGetUniformLocation_()
113     virtual void glLinkProgram_(GLuint program) override {}  in glLinkProgram_()
123     virtual void glShaderBinary_(GLsizei count, const GLuint* shaders, GLenum binaryformat,  in glShaderBinary_()
125     virtual void glShaderSource_(GLuint shader, GLsizei count, const GLchar* const* string,  in glShaderSource_()
127     virtual void glStencilFunc_(GLenum func, GLint ref, GLuint mask) override {}  in glStencilFunc_()
128     virtual void glStencilFuncSeparate_(GLenum face, GLenum func, GLint ref, GLuint mask) override {  in glStencilFuncSeparate_()
130     virtual void glStencilMask_(GLuint mask) override {}  in glStencilMask_()
131     virtual void glStencilMaskSeparate_(GLenum face, GLuint mask) override {}  in glStencilMaskSeparate_()
168     virtual void glUseProgram_(GLuint program) override {}  in glUseProgram_()
169     virtual void glValidateProgram_(GLuint program) override {}  in glValidateProgram_()
170     virtual void glVertexAttrib1f_(GLuint index, GLfloat x) override {}  in glVertexAttrib1f_()
171     virtual void glVertexAttrib1fv_(GLuint index, const GLfloat* v) override {}  in glVertexAttrib1fv_()
172     virtual void glVertexAttrib2f_(GLuint index, GLfloat x, GLfloat y) override {}  in glVertexAttrib2f_()
173     virtual void glVertexAttrib2fv_(GLuint index, const GLfloat* v) override {}  in glVertexAttrib2fv_()
174     virtual void glVertexAttrib3f_(GLuint index, GLfloat x, GLfloat y, GLfloat z) override {}  in glVertexAttrib3f_()
175     virtual void glVertexAttrib3fv_(GLuint index, const GLfloat* v) override {}  in glVertexAttrib3fv_()
176     virtual void glVertexAttrib4f_(GLuint index, GLfloat x, GLfloat y, GLfloat z,  in glVertexAttrib4f_()
178     virtual void glVertexAttrib4fv_(GLuint index, const GLfloat* v) override {}  in glVertexAttrib4fv_()
179     virtual void glVertexAttribPointer_(GLuint index, GLint size, GLenum type, GLboolean normalized,  in glVertexAttribPointer_()