Function clamp255

cmp_compressonatorlib/astc/astc_encode_kernel.cpp:4550–4563

clamp an input value to [0,255]; NaN is turned into 0

// clamp an input value to [0,255]; NaN is turned into 0
float clamp255(float val)
{
    if (val > 255.0f)
        val = 255.0f;
    else if (val > 0.0f)
    {
        // deliberately empty
        // switching the order of calculation here will fail to handle 0.
    }
    else
        val = 0.0f;

    return val;
}

// clamp an input value to [0,1]; Nan is turned into 0.
float clamp01(float val)