/*
 * Copyright 2012, 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: 
 *		Dalai Felinto
 *		Daniel Salazar
 */

#include "COM_MapRangeOperation.h"

MapRangeOperation::MapRangeOperation() : NodeOperation()
{
	this->addInputSocket(COM_DT_VALUE);
	this->addInputSocket(COM_DT_VALUE);
	this->addInputSocket(COM_DT_VALUE);
	this->addInputSocket(COM_DT_VALUE);
	this->addInputSocket(COM_DT_VALUE);
	this->addOutputSocket(COM_DT_VALUE);
	this->m_inputOperation = NULL;
	this->m_useClamp = FALSE;
}

void MapRangeOperation::initExecution()
{
	this->m_inputOperation = this->getInputSocketReader(0);
	this->m_sourceMinOperation = this->getInputSocketReader(1);
	this->m_sourceMaxOperation = this->getInputSocketReader(2);
	this->m_destMinOperation = this->getInputSocketReader(3);
	this->m_destMaxOperation = this->getInputSocketReader(4);
}

void MapRangeOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
{
	float inputs[8]; /* includes the 5 inputs + 3 pads */
	float value;
	float source_min, source_max;
	float dest_min, dest_max;

	this->m_inputOperation->read(inputs, x, y, sampler);
	this->m_sourceMinOperation->read(inputs + 1, x, y, sampler);
	this->m_sourceMaxOperation->read(inputs + 2, x, y, sampler);
	this->m_destMinOperation->read(inputs + 3, x, y, sampler);
	this->m_destMaxOperation->read(inputs + 4, x, y, sampler);
	
	value = inputs[0];
	source_min = inputs[1];
	source_max = inputs[2];
	dest_min = inputs[3];
	dest_max = inputs[4];
	
	value = (value - source_min) / (source_max - source_min);
	value = dest_min + value * (dest_max - dest_min);

	if (this->m_useClamp) {
		if (dest_max > dest_min) {
			CLAMP(value, dest_min, dest_max);
		}
		else {
			CLAMP(value, dest_max, dest_min);
		}
	}

	output[0] = value;
}

void MapRangeOperation::deinitExecution()
{
	this->m_inputOperation = NULL;
	this->m_sourceMinOperation = NULL;
	this->m_sourceMaxOperation = NULL;
	this->m_destMinOperation = NULL;
	this->m_destMaxOperation = NULL;
}