GL_ARB_texture_float
http://oss.sgi.com/projects/ogl-sample/registry/ARB/texture_float.txt
	GL_RGBA32F_ARB 0x8814
	GL_RGB32F_ARB 0x8815
	GL_ALPHA32F_ARB 0x8816
	GL_INTENSITY32F_ARB 0x8817
	GL_LUMINANCE32F_ARB 0x8818
	GL_LUMINANCE_ALPHA32F_ARB 0x8819
	GL_RGBA16F_ARB 0x881A
	GL_RGB16F_ARB 0x881B
	GL_ALPHA16F_ARB 0x881C
	GL_INTENSITY16F_ARB 0x881D
	GL_LUMINANCE16F_ARB 0x881E
	GL_LUMINANCE_ALPHA16F_ARB 0x881F
	GL_TEXTURE_RED_TYPE_ARB 0x8C10
	GL_TEXTURE_GREEN_TYPE_ARB 0x8C11
	GL_TEXTURE_BLUE_TYPE_ARB 0x8C12
	GL_TEXTURE_ALPHA_TYPE_ARB 0x8C13
	GL_TEXTURE_LUMINANCE_TYPE_ARB 0x8C14
	GL_TEXTURE_INTENSITY_TYPE_ARB 0x8C15
	GL_TEXTURE_DEPTH_TYPE_ARB 0x8C16
	GL_UNSIGNED_NORMALIZED_ARB 0x8C17