GL_APPLE_float_pixels http://www.opengl.org/registry/specs/APPLE/float_pixels.txt GL_APPLE_float_pixels GL_HALF_APPLE 0x140B GL_COLOR_FLOAT_APPLE 0x8A0F GL_RGBA_FLOAT32_APPLE 0x8814 GL_RGB_FLOAT32_APPLE 0x8815 GL_ALPHA_FLOAT32_APPLE 0x8816 GL_INTENSITY_FLOAT32_APPLE 0x8817 GL_LUMINANCE_FLOAT32_APPLE 0x8818 GL_LUMINANCE_ALPHA_FLOAT32_APPLE 0x8819 GL_RGBA_FLOAT16_APPLE 0x881A GL_RGB_FLOAT16_APPLE 0x881B GL_ALPHA_FLOAT16_APPLE 0x881C GL_INTENSITY_FLOAT16_APPLE 0x881D GL_LUMINANCE_FLOAT16_APPLE 0x881E GL_LUMINANCE_ALPHA_FLOAT16_APPLE 0x881F