GL_EXT_texture http://www.opengl.org/registry/specs/EXT/texture.txt GL_EXT_texture GL_ALPHA4_EXT 0x803B GL_ALPHA8_EXT 0x803C GL_ALPHA12_EXT 0x803D GL_ALPHA16_EXT 0x803E GL_LUMINANCE4_EXT 0x803F GL_LUMINANCE8_EXT 0x8040 GL_LUMINANCE12_EXT 0x8041 GL_LUMINANCE16_EXT 0x8042 GL_LUMINANCE4_ALPHA4_EXT 0x8043 GL_LUMINANCE6_ALPHA2_EXT 0x8044 GL_LUMINANCE8_ALPHA8_EXT 0x8045 GL_LUMINANCE12_ALPHA4_EXT 0x8046 GL_LUMINANCE12_ALPHA12_EXT 0x8047 GL_LUMINANCE16_ALPHA16_EXT 0x8048 GL_INTENSITY_EXT 0x8049 GL_INTENSITY4_EXT 0x804A GL_INTENSITY8_EXT 0x804B GL_INTENSITY12_EXT 0x804C GL_INTENSITY16_EXT 0x804D GL_RGB2_EXT 0x804E GL_RGB4_EXT 0x804F GL_RGB5_EXT 0x8050 GL_RGB8_EXT 0x8051 GL_RGB10_EXT 0x8052 GL_RGB12_EXT 0x8053 GL_RGB16_EXT 0x8054 GL_RGBA2_EXT 0x8055 GL_RGBA4_EXT 0x8056 GL_RGB5_A1_EXT 0x8057 GL_RGBA8_EXT 0x8058 GL_RGB10_A2_EXT 0x8059 GL_RGBA12_EXT 0x805A GL_RGBA16_EXT 0x805B GL_TEXTURE_RED_SIZE_EXT 0x805C GL_TEXTURE_GREEN_SIZE_EXT 0x805D GL_TEXTURE_BLUE_SIZE_EXT 0x805E GL_TEXTURE_ALPHA_SIZE_EXT 0x805F GL_TEXTURE_LUMINANCE_SIZE_EXT 0x8060 GL_TEXTURE_INTENSITY_SIZE_EXT 0x8061 GL_REPLACE_EXT 0x8062 GL_PROXY_TEXTURE_1D_EXT 0x8063 GL_PROXY_TEXTURE_2D_EXT 0x8064