1 /*

     2  * scene.cc: screen sample generation and image reconstruction

     3  *

     4  * This file is part of Pyrit Ray Tracer.

     5  *

     6  * Copyright 2008  Radek Brich

     7  *

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

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

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

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

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

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

    14  *

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

    16  * all copies or substantial portions of the Software.

    17  *

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

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

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

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

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

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

    24  * THE SOFTWARE.

    25  */

    26 

    27 #include <math.h>

    28 

    29 #include "common.h"

    30 #include "scene.h"

    31 

    32 int DefaultSampler::initSampleSet()

    33 {

    34 	if ( phase == 0 )

    35 	{

    36 		phase++;

    37 		return w*h;

    38 	}

    39 	else

    40 	{

    41 		phase = -1;

    42 		return 0;

    43 	}

    44 }

    45 

    46 Sample* DefaultSampler::nextSample(Sample *prev)

    47 {

    48 	DefaultSample *s = new DefaultSample;

    49 	if (prev)

    50 	{

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

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

    53 		s->sy = sp->sy;

    54 		if (s->sx >= w)

    55 		{

    56 			s->sx = 0;

    57 			s->sy++;

    58 		}

    59 		if (s->sy >= h)

    60 		{

    61 			delete s;

    62 			return NULL;

    63 		}

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

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

    66 	}

    67 	else

    68 	{

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

    70 		s->y = -0.5;

    71 		s->sx = 0;

    72 		s->sy = 0;

    73 	}

    74 	return s;

    75 }

    76 

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

    78 {

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

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

    81 	*(buf++) = col.r;

    82 	*(buf++) = col.g;

    83 	*(buf++) = col.b;

    84 }

    85