{
            // Infinity or NaN
            // NaN bits that are masked out by 0x3FF get discarded.
            // This can turn some NaNs to infinity, but this is allowed by the spec.
            f16 = sign | (0x1Fu << 10);
            f16 |= (mantissa & 0x3FFu);
        }
        else if (exponent > 15)
        {
            // Overflow - flush to Infinity
            f16 = sign | (0x1Fu << 10);
        }
        else if (exponent > -15)
        {
            // Representable value
            exponent += 15;
            mantissa >>= 13;
            f16 = sign | uint(exponent << 10) | mantissa;
        }
        else
        {
            f16 = sign;
        }
        return f16;
    }
#endif

uint packHalf2x16_emu(vec2 v)
{
    #if defined(GL_ARB_shading_language_packing)
        return packHalf2x16(v);
    #else
        uint x = f32tof16(v.x);
        uint y = f32tof16(v.y);
        return (y << 16) | x;
    #endif
}