/*

 * scene.cc: screen sample generation and image reconstruction

 *

 * This file is part of Pyrit Ray Tracer.

 *

 * Copyright 2008  Radek Brich

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <math.h>

#include "common.h"

#include "scene.h"

int DefaultSampler::initSampleSet()

{

	if ( phase == 0 )

	{

		phase++;

		return w*h;

	}

	else

	{

		phase = -1;

		return 0;

	}

}

Sample* DefaultSampler::nextSample(Sample *prev)

{

	DefaultSample *s = new DefaultSample;

	if (prev)

	{

		DefaultSample *sp = static_cast<DefaultSample*>(prev);

		s->sx = sp->sx + 1;

		s->sy = sp->sy;

		if (s->sx >= w)

		{

			s->sx = 0;

			s->sy++;

		}

		if (s->sy >= h)

		{

			delete s;

			return NULL;

		}

		s->x = (Float)s->sx/h - (Float)w/h/2.0;

		s->y = (Float)s->sy/h - 0.5;

	}

	else

	{

		s->x = -(Float)w/h/2.0;

		s->y = -0.5;

		s->sx = 0;

		s->sy = 0;

	}

	return s;

}

void DefaultSampler::saveSample(Sample *samp, Colour &col)

{

	DefaultSample *sp = static_cast<DefaultSample*>(samp);

	Float *buf = buffer + 3*(sp->sy*w + sp->sx);

	*(buf++) = col.r;

	*(buf++) = col.g;

	*(buf++) = col.b;

}