GL_IMG_texture_filter_cubic
https://www.khronos.org/registry/OpenGL/extensions/IMG/IMG_texture_filter_cubic.txt
GL_IMG_texture_filter_cubic

	GL_CUBIC_IMG 0x9139
	GL_CUBIC_MIPMAP_NEAREST_IMG 0x913A
	GL_CUBIC_MIPMAP_LINEAR_IMG 0x913B
