GL_OES_shader_multisample_interpolation
https://www.khronos.org/registry/OpenGL/extensions/OES/OES_shader_multisample_interpolation.txt
GL_OES_shader_multisample_interpolation

	GL_MIN_FRAGMENT_INTERPOLATION_OFFSET_OES 0x8E5B
	GL_MAX_FRAGMENT_INTERPOLATION_OFFSET_OES 0x8E5C
	GL_FRAGMENT_INTERPOLATION_OFFSET_BITS_OES 0x8E5D