See the OpenGL ARB enum registry at http://www.opengl.org/registry/api/enum.spec Blocks allocated to Mesa: 0x8750-0x875F 0x8BB0-0x8BBF GL_MESA_packed_depth_stencil GL_DEPTH_STENCIL_MESA 0x8750 GL_UNSIGNED_INT_24_8_MESA 0x8751 GL_UNSIGNED_INT_8_24_REV_MESA 0x8752 GL_UNSIGNED_SHORT_15_1_MESA 0x8753 GL_UNSIGNED_SHORT_1_15_REV_MESA 0x8754 GL_MESA_trace.spec: GL_TRACE_ALL_BITS_MESA 0xFFFF GL_TRACE_OPERATIONS_BIT_MESA 0x0001 GL_TRACE_PRIMITIVES_BIT_MESA 0x0002 GL_TRACE_ARRAYS_BIT_MESA 0x0004 GL_TRACE_TEXTURES_BIT_MESA 0x0008 GL_TRACE_PIXELS_BIT_MESA 0x0010 GL_TRACE_ERRORS_BIT_MESA 0x0020 GL_TRACE_MASK_MESA 0x8755 GL_TRACE_NAME_MESA 0x8756 MESA_ycbcr_texture.spec: GL_YCBCR_MESA 0x8757 GL_UNSIGNED_SHORT_8_8_MESA 0x85BA /* same as Apple's */ GL_UNSIGNED_SHORT_8_8_REV_MESA 0x85BB /* same as Apple's */ GL_MESA_pack_invert.spec GL_PACK_INVERT_MESA 0x8758 GL_MESA_shader_debug.spec: (obsolete) GL_DEBUG_OBJECT_MESA 0x8759 GL_DEBUG_PRINT_MESA 0x875A GL_DEBUG_ASSERT_MESA 0x875B GL_MESA_program_debug.spec: (obsolete) GL_FRAGMENT_PROGRAM_CALLBACK_MESA 0x???? GL_VERTEX_PROGRAM_CALLBACK_MESA 0x???? GL_FRAGMENT_PROGRAM_POSITION_MESA 0x???? GL_VERTEX_PROGRAM_POSITION_MESA 0x???? GL_FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA 0x???? GL_FRAGMENT_PROGRAM_CALLBACK_DATA_MESA 0x???? GL_VERTEX_PROGRAM_CALLBACK_FUNC_MESA 0x???? GL_VERTEX_PROGRAM_CALLBACK_DATA_MESA 0x???? GL_MESAX_texture_stack: GL_TEXTURE_1D_STACK_MESAX 0x8759 GL_TEXTURE_2D_STACK_MESAX 0x875A GL_PROXY_TEXTURE_1D_STACK_MESAX 0x875B GL_PROXY_TEXTURE_2D_STACK_MESAX 0x875C GL_TEXTURE_1D_STACK_BINDING_MESAX 0x875D GL_TEXTURE_2D_STACK_BINDING_MESAX 0x875E