GL_SUNX_constant_data
https://www.khronos.org/registry/OpenGL/extensions/SUNX/SUNX_constant_data.txt
GL_SUNX_constant_data

	GL_UNPACK_CONSTANT_DATA_SUNX 0x81D5
	GL_TEXTURE_CONSTANT_DATA_SUNX 0x81D6
	void glFinishTextureSUNX (void)
