GL_EXT_color_buffer_half_float
http://www.opengl.org/registry/specs/EXT/color_buffer_half_float.txt
GL_EXT_color_buffer_half_float

	GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT 0x8211
	GL_R16F_EXT 0x822D
	GL_RG16F_EXT 0x822F
	GL_RGBA16F_EXT 0x881A
	GL_RGB16F_EXT 0x881B
	GL_UNSIGNED_NORMALIZED_EXT 0x8C17
