/*
 * 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
 *		Thomas Beck (plasmasolutions.de)
 */

#include "COM_WrapOperation.h"

WrapOperation::WrapOperation(DataType datatype) : ReadBufferOperation(datatype)
{
	this->m_wrappingType = CMP_NODE_WRAP_NONE;
}

inline float WrapOperation::getWrappedOriginalXPos(float x)
{
	if (this->getWidth() == 0) return 0;
	while (x < 0) x += this->m_width;
	return fmodf(x, this->getWidth());
}

inline float WrapOperation::getWrappedOriginalYPos(float y)
{
	if (this->getHeight() == 0) return 0;
	while (y < 0) y += this->m_height;
	return fmodf(y, this->getHeight());
}

void WrapOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
{
	float nx, ny;
	nx = x;
	ny = y;
	MemoryBufferExtend extend_x = COM_MB_CLIP, extend_y = COM_MB_CLIP;
	switch (m_wrappingType) {
		case CMP_NODE_WRAP_NONE:
			//Intentionally empty, originalXPos and originalYPos have been set before
			break;
		case CMP_NODE_WRAP_X:
			// wrap only on the x-axis
			nx = this->getWrappedOriginalXPos(x);
			extend_x = COM_MB_REPEAT;
			break;
		case CMP_NODE_WRAP_Y:
			// wrap only on the y-axis
			ny = this->getWrappedOriginalYPos(y);
			extend_y = COM_MB_REPEAT;
			break;
		case CMP_NODE_WRAP_XY:
			// wrap on both
			nx = this->getWrappedOriginalXPos(x);
			ny = this->getWrappedOriginalYPos(y);
			extend_x = COM_MB_REPEAT;
			extend_y = COM_MB_REPEAT;
			break;
	}

	executePixelExtend(output, nx, ny, sampler, extend_x, extend_y);
}

bool WrapOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
{
	rcti newInput;
	newInput.xmin = input->xmin;
	newInput.xmax = input->xmax;
	newInput.ymin = input->ymin;
	newInput.ymax = input->ymax;

	if (m_wrappingType == CMP_NODE_WRAP_X || m_wrappingType == CMP_NODE_WRAP_XY) {
		// wrap only on the x-axis if tile is wrapping
		newInput.xmin = getWrappedOriginalXPos(input->xmin);
		newInput.xmax = getWrappedOriginalXPos(input->xmax) + 0.5f;
		if (newInput.xmin >= newInput.xmax) {
			newInput.xmin = 0;
			newInput.xmax = this->getWidth();
		}
	}
	if (m_wrappingType == CMP_NODE_WRAP_Y || m_wrappingType == CMP_NODE_WRAP_XY) {
		// wrap only on the y-axis if tile is wrapping
		newInput.ymin = getWrappedOriginalYPos(input->ymin);
		newInput.ymax = getWrappedOriginalYPos(input->ymax) + 0.5f;
		if (newInput.ymin >= newInput.ymax) {
			newInput.ymin = 0;
			newInput.ymax = this->getHeight();
		}
	}

	return ReadBufferOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
}

void WrapOperation::setWrapping(int wrapping_type)
{
	m_wrappingType = wrapping_type;
}
