GL_ATI_texture_float
http://oss.sgi.com/projects/ogl-sample/registry/ATI/texture_float.txt
	GL_RGBA_FLOAT32_ATI 0x8814
	GL_RGB_FLOAT32_ATI 0x8815
	GL_ALPHA_FLOAT32_ATI 0x8816
	GL_INTENSITY_FLOAT32_ATI 0x8817
	GL_LUMINANCE_FLOAT32_ATI 0x8818
	GL_LUMINANCE_ALPHA_FLOAT32_ATI 0x8819
	GL_RGBA_FLOAT16_ATI 0x881A
	GL_RGB_FLOAT16_ATI 0x881B
	GL_ALPHA_FLOAT16_ATI 0x881C
	GL_INTENSITY_FLOAT16_ATI 0x881D
	GL_LUMINANCE_FLOAT16_ATI 0x881E
	GL_LUMINANCE_ALPHA_FLOAT16_ATI 0x881F