Function mpsnr_sumdiff

Source/astcenccli_error_metrics.cpp:92–107

* @brief mPSNR difference between two values. * * Differences are given as "val1 - val2". * * @param val1 The first color value * @param val2 The second color value * @param fstop_lo The low exposure fstop; should be in range [-125, 125] * @param fstop_hi The high exposure fstop; should be in range [-125, 125] * * @return The summed mPSNR difference across all active fstop

 * @return The summed mPSNR difference across all active fstop levels
 */
static float mpsnr_sumdiff(
	float val1,
	float val2,
	int fstop_lo,
	int fstop_hi
) {
	float summa = 0.0f;
	for (int i = fstop_lo; i <= fstop_hi; i++)
	{
		float mval1 = mpsnr_operator(val1, i);
		float mval2 = mpsnr_operator(val2, i);
		float mdiff = mval1 - mval2;
		summa += mdiff * mdiff;
	}
	return summa;
}

/* See header for documentation */
void compute_error_metrics(