/*
 * Copyright 2011, Blender 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_InvertOperation.h"

InvertOperation::InvertOperation() : NodeOperation()
{
	this->addInputSocket(COM_DT_VALUE);
	this->addInputSocket(COM_DT_COLOR);
	this->addOutputSocket(COM_DT_COLOR);
	this->m_inputValueProgram = NULL;
	this->m_inputColorProgram = NULL;
	this->m_color = true;
	this->m_alpha = false;
	setResolutionInputSocketIndex(1);
}
void InvertOperation::initExecution()
{
	this->m_inputValueProgram = this->getInputSocketReader(0);
	this->m_inputColorProgram = this->getInputSocketReader(1);
}

void InvertOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
{
	float inputValue[4];
	float inputColor[4];
	this->m_inputValueProgram->readSampled(inputValue, x, y, sampler);
	this->m_inputColorProgram->readSampled(inputColor, x, y, sampler);

	const float value = inputValue[0];
	const float invertedValue = 1.0f - value;

	if (this->m_color) {
		output[0] = (1.0f - inputColor[0]) * value + inputColor[0] * invertedValue;
		output[1] = (1.0f - inputColor[1]) * value + inputColor[1] * invertedValue;
		output[2] = (1.0f - inputColor[2]) * value + inputColor[2] * invertedValue;
	}
	else {
		copy_v3_v3(output, inputColor);
	}

	if (this->m_alpha)
		output[3] = (1.0f - inputColor[3]) * value + inputColor[3] * invertedValue;
	else
		output[3] = inputColor[3];

}

void InvertOperation::deinitExecution()
{
	this->m_inputValueProgram = NULL;
	this->m_inputColorProgram = NULL;
}