godot/thirdparty/etc2comp/EtcMath.h

/*
 * Copyright 2015 The Etc2Comp Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <math.h>

namespace Etc
{

	// ----------------------------------------------------------------------------------------------------
	// return true if vertical line
	bool Regression(float a_afX[], float a_afY[], unsigned int a_Points,
					float *a_fSlope, float *a_fOffset);

	inline float ConvertMSEToPSNR(float a_fMSE)
	{
		if (a_fMSE == 0.0f)
		{
			return INFINITY;
		}

		return 10.0f * log10f(1.0f / a_fMSE);
	}


}