GL_EXT_texture_norm16
http://www.opengl.org/registry/specs/EXT/texture_norm16.txt
GL_EXT_texture_norm16

	GL_RGB16_EXT 0x8054
	GL_RGBA16_EXT 0x805B
	GL_R16_EXT 0x822A
	GL_RG16_EXT 0x822C
	GL_R16_SNORM_EXT 0x8F98
	GL_RG16_SNORM_EXT 0x8F99
	GL_RGB16_SNORM_EXT 0x8F9A
	GL_RGBA16_SNORM_EXT 0x8F9B
