GL_VERSION_4_2
http://www.opengl.org/registry/doc/glspec42.core.20110822.pdf

	GL_COMPRESSED_RGBA_BPTC_UNORM 0x8E8C
	GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM 0x8E8D
	GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT 0x8E8E
	GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT 0x8E8F