GL_SGIX_texture_range http://www.opengl.org/registry/specs/SGIX/texture_range.txt GL_SGIX_texture_range GL_RGB_SIGNED_SGIX 0x85E0 GL_RGBA_SIGNED_SGIX 0x85E1 GL_ALPHA_SIGNED_SGIX 0x85E2 GL_LUMINANCE_SIGNED_SGIX 0x85E3 GL_INTENSITY_SIGNED_SGIX 0x85E4 GL_LUMINANCE_ALPHA_SIGNED_SGIX 0x85E5 GL_RGB16_SIGNED_SGIX 0x85E6 GL_RGBA16_SIGNED_SGIX 0x85E7 GL_ALPHA16_SIGNED_SGIX 0x85E8 GL_LUMINANCE16_SIGNED_SGIX 0x85E9 GL_INTENSITY16_SIGNED_SGIX 0x85EA GL_LUMINANCE16_ALPHA16_SIGNED_SGIX 0x85EB GL_RGB_EXTENDED_RANGE_SGIX 0x85EC GL_RGBA_EXTENDED_RANGE_SGIX 0x85ED GL_ALPHA_EXTENDED_RANGE_SGIX 0x85EE GL_LUMINANCE_EXTENDED_RANGE_SGIX 0x85EF GL_INTENSITY_EXTENDED_RANGE_SGIX 0x85F0 GL_LUMINANCE_ALPHA_EXTENDED_RANGE_SGIX 0x85F1 GL_RGB16_EXTENDED_RANGE_SGIX 0x85F2 GL_RGBA16_EXTENDED_RANGE_SGIX 0x85F3 GL_ALPHA16_EXTENDED_RANGE_SGIX 0x85F4 GL_LUMINANCE16_EXTENDED_RANGE_SGIX 0x85F5 GL_INTENSITY16_EXTENDED_RANGE_SGIX 0x85F6 GL_LUMINANCE16_ALPHA16_EXTENDED_RANGE_SGIX 0x85F7 GL_MIN_LUMINANCE_SGIS 0x85F8 GL_MAX_LUMINANCE_SGIS 0x85F9 GL_MIN_INTENSITY_SGIS 0x85FA GL_MAX_INTENSITY_SGIS 0x85FB