GL_ARB_texture_compression_bptc
http://www.opengl.org/registry/specs/gl/ARB/texture_compression_bptc.txt
GL_ARB_texture_compression_bptc
	GL_COMPRESSED_RGBA_BPTC_UNORM_ARB 0x8E8C
	GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB 0x8E8D
	GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB 0x8E8E
	GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB 0x8E8F