/*
 * 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_TextureOperation.h"

#include "BLI_listbase.h"
#include "DNA_scene_types.h"

TextureBaseOperation::TextureBaseOperation(): NodeOperation() {
	this->addInputSocket(COM_DT_VECTOR);//offset
	this->addInputSocket(COM_DT_VECTOR);//size
	this->texture = NULL;
	this->inputSize = NULL;
	this->inputOffset = NULL;
}
TextureOperation::TextureOperation() : TextureBaseOperation() {
	this->addOutputSocket(COM_DT_COLOR);
}
TextureAlphaOperation::TextureAlphaOperation() : TextureBaseOperation() {
	this->addOutputSocket(COM_DT_VALUE);
}

void TextureBaseOperation::initExecution() {
	this->inputOffset = getInputSocketReader(0);
	this->inputSize = getInputSocketReader(1);
}
void TextureBaseOperation::deinitExecution() {
	this->inputSize = NULL;
	this->inputOffset = NULL;
}

void TextureBaseOperation::determineResolution(unsigned int resolution[], unsigned int preferredResolution[]) {
	if (preferredResolution[0] == 0 || preferredResolution[1] == 0) {
		resolution[0] = COM_DEFAULT_RESOLUTION_WIDTH;
		resolution[1] = COM_DEFAULT_RESOLUTION_HEIGHT;
	}
	else {
		resolution[0] = preferredResolution[0];
		resolution[1] = preferredResolution[1];
	}
}

void TextureAlphaOperation::executePixel(float *color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
	TextureBaseOperation::executePixel(color, x, y, sampler, inputBuffers);
	color[0] = color[3];
	color[1] = 0.0f;
	color[2] = 0.0f;
	color[3] = 0.0f;
}

void TextureBaseOperation::executePixel(float *color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
	TexResult texres= {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0, NULL};
	float textureSize[4];
	float textureOffset[4];
	float vec[3];
	int retval;
	const float cx = this->getWidth()/2;
	const float cy = this->getHeight()/2;
	const float u = (cx-x)/this->getWidth()*2;
	const float v = (cy-y)/this->getHeight()*2;

	this->inputSize->read(textureSize, x, y, sampler, inputBuffers);
	this->inputOffset->read(textureOffset, x, y, sampler, inputBuffers);

	vec[0]= textureSize[0]*(u + textureOffset[0]);
	vec[1]= textureSize[1]*(v + textureOffset[1]);
	vec[2]= textureSize[2]*textureOffset[2];

	retval= multitex_ext(this->texture, vec, NULL, NULL, 0, &texres);

	if (texres.talpha)
		color[3]= texres.ta;
	else
		color[3]= texres.tin;

	if ((retval & TEX_RGB)) {
		color[0]= texres.tr;
		color[1]= texres.tg;
		color[2]= texres.tb;
	}
	else color[0]= color[1]= color[2]= color[3];
}