GL_NV_fog_distance
https://www.khronos.org/registry/OpenGL/extensions/NV/NV_fog_distance.txt
GL_NV_fog_distance

	GL_FOG_DISTANCE_MODE_NV 0x855A
	GL_EYE_RADIAL_NV 0x855B
	GL_EYE_PLANE_ABSOLUTE_NV 0x855C
