GL_EXT_packed_pixels http://www.opengl.org/registry/specs/EXT/packed_pixels.txt GL_EXT_packed_pixels GL_UNSIGNED_BYTE_3_3_2_EXT 0x8032 GL_UNSIGNED_SHORT_4_4_4_4_EXT 0x8033 GL_UNSIGNED_SHORT_5_5_5_1_EXT 0x8034 GL_UNSIGNED_INT_8_8_8_8_EXT 0x8035 GL_UNSIGNED_INT_10_10_10_2_EXT 0x8036