typedef struct glamor_gl_dispatch {
  /* Transformation functions */
  void (*glMatrixMode)(GLenum mode);
  void (*glLoadIdentity)(void);
  void (*glViewport)( GLint x, GLint y,
                      GLsizei width, GLsizei height );
  /* Drawing functions */ 
  void (*glRasterPos2i)( GLint x, GLint y );

  /* Vertex Array */
  void (*glDrawArrays)( GLenum mode, GLint first, GLsizei count );

  /* Raster functions */
  void (*glReadPixels)( GLint x, GLint y,
                        GLsizei width, GLsizei height,
                        GLenum format, GLenum type,
                        GLvoid *pixels );

  void (*glDrawPixels)( GLsizei width, GLsizei height,
                        GLenum format, GLenum type,
                        const GLvoid *pixels );
  void (*glPixelStorei)( GLenum pname, GLint param ); 
  /* Texture Mapping */

  void (*glTexParameteri)( GLenum target, GLenum pname, GLint param );
  void (*glTexImage2D)( GLenum target, GLint level,
                        GLint internalFormat,
                        GLsizei width, GLsizei height,
                        GLint border, GLenum format, GLenum type,
                        const GLvoid *pixels );
  /* 1.1 */
  void (*glGenTextures)( GLsizei n, GLuint *textures );
  void (*glDeleteTextures)( GLsizei n, const GLuint *textures);
  void (*glBindTexture)( GLenum target, GLuint texture );                                                                                                                         
  void (*glTexSubImage2D)( GLenum target, GLint level,
                           GLint xoffset, GLint yoffset,
                           GLsizei width, GLsizei height,
                           GLenum format, GLenum type,
                           const GLvoid *pixels );
  /* MISC */
  void (*glFlush)( void );
  void (*glGetIntegerv)( GLenum pname, GLint *params );
  const GLubyte * (*glGetString)( GLenum name );
  void (*glScissor)( GLint x, GLint y, GLsizei width, GLsizei height);
  void (*glEnable)( GLenum cap );
  void (*glDisable)( GLenum cap );
  void (*glBlendFunc)( GLenum sfactor, GLenum dfactor );
  void (*glLogicOp)( GLenum opcode );

  /* 1.3 */
  void (*glActiveTexture)( GLenum texture );

  /* GL Extentions */
  void (*glGenBuffers) (GLsizei n, GLuint *buffers);
  void (*glBufferData) (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage);
  GLvoid* (*glMapBuffer) (GLenum target, GLenum access);
  GLboolean (*glUnmapBuffer) (GLenum target);
  void (*glBindBuffer) (GLenum target, GLuint buffer);
  void (*glDeleteBuffers) (GLsizei n, const GLuint *buffers);        

  void (*glFramebufferTexture2D) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
  void (*glBindFramebuffer) (GLenum target, GLuint framebuffer);
  void (*glDeleteFramebuffers) (GLsizei n, const GLuint *framebuffers);
  void (*glGenFramebuffers) (GLsizei n, GLuint *framebuffers);          
  GLenum (*glCheckFramebufferStatus) (GLenum target);
  void (*glBlitFramebuffer) (GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);

  void (*glVertexAttribPointer) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
  void (*glDisableVertexAttribArray) (GLuint index);
  void (*glEnableVertexAttribArray) (GLuint index);
  void (*glBindAttribLocation) (GLuint program, GLuint index, const GLchar *name);

  void (*glLinkProgram) (GLuint program);
  void (*glShaderSource) (GLuint shader, GLsizei count, const GLchar* *string, const GLint *length);
  void (*glUseProgram) (GLuint program);
  void (*glUniform1i) (GLint location, GLint v0);
  void (*glUniform4f) (GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
  void (*glUniform4fv) (GLint location, GLsizei count, const GLfloat *value);
  GLuint (*glCreateProgram) (void);
  GLuint (*glCreateShader) (GLenum type);
  void (*glCompileShader) (GLuint shader);
  void (*glAttachShader) (GLuint program, GLuint shader);
  void (*glGetShaderiv) (GLuint shader, GLenum pname, GLint *params);
  void (*glGetShaderInfoLog) (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
  void (*glGetProgramiv) (GLuint program, GLenum pname, GLint *params);
  void (*glGetProgramInfoLog) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
  GLint (*glGetUniformLocation) (GLuint program, const GLchar *name);

}glamor_gl_dispatch;

Bool
glamor_gl_dispatch_init_impl(struct glamor_gl_dispatch *dispatch,
                             int gl_version,
                             void *(*get_proc_address)(const char*));


Bool
glamor_gl_dispatch_init(ScreenPtr screen, struct glamor_gl_dispatch *dispatch, int gl_version);