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GL_EXT_packed_float
http://developer.download.nvidia.com/opengl/specs/GL_EXT_packed_float.txt
GL_EXT_packed_float
	GL_R11F_G11F_B10F_EXT 0x8C3A
	GL_UNSIGNED_INT_10F_11F_11F_REV_EXT 0x8C3B
	GL_RGBA_SIGNED_COMPONENTS_EXT 0x8C3C