/*
 * Copyright 2011, Glareer Foundation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributor: 
 *		Jeroen Bakker 
 *		Monique Dewanchand
 */

#include "COM_MixGlareOperation.h"

MixGlareOperation::MixGlareOperation() : MixBaseOperation()
{
	/* pass */
}

void MixGlareOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
{
	float inputColor1[4];
	float inputColor2[4];
	float inputValue[4];
	float value;
	
	this->m_inputValueOperation->read(inputValue, x, y, sampler);
	this->m_inputColor1Operation->read(inputColor1, x, y, sampler);
	this->m_inputColor2Operation->read(inputColor2, x, y, sampler);
	value = inputValue[0];
	float mf = 2.f - 2.f * fabsf(value - 0.5f);
	
	if (inputColor1[0] < 0.0f) inputColor1[0] = 0.0f;
	if (inputColor1[1] < 0.0f) inputColor1[1] = 0.0f;
	if (inputColor1[2] < 0.0f) inputColor1[2] = 0.0f;

	output[0] = mf * max(inputColor1[0] + value * (inputColor2[0] - inputColor1[0]), 0.0f);
	output[1] = mf * max(inputColor1[1] + value * (inputColor2[1] - inputColor1[1]), 0.0f);
	output[2] = mf * max(inputColor1[2] + value * (inputColor2[2] - inputColor1[2]), 0.0f);
	output[3] = inputColor1[3];

	clampIfNeeded(output);
}