JitteredSampleGenerator.cpp

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/**<!-------------------------------------------------------------------->
   @file   JitteredSampleGenerator.cpp
   @author Travis Fischer (fisch0920@gmail.com)
   @date   Fall 2008
   
   @brief
      Jittered point sample generation over a given 2D domain where M*N 
   samples are generated randomly within M*N uniformly-spaced subdomains
   <!-------------------------------------------------------------------->**/

#include "JitteredSampleGenerator.h"
#include <Random.h>
#include <QtCore>
using namespace std;

template <class SG>
void JitteredSG<SG>::generate(PointSampleList &outSamples, 
                              const Viewport &viewport)
{
   const unsigned width   = viewport.getWidth();
   const unsigned height  = viewport.getHeight();
   
   const real_t binWidth  = viewport.getInvWidth();
   const real_t binHeight = viewport.getInvHeight();
   
   for(unsigned i = 0; i < height; ++i) {
      for(unsigned j = 0; j < width; ++j) {
         const real_t x = j * binWidth + Random::sample(0, binWidth);
         const real_t y = i * binWidth + Random::sample(0, binHeight);
         
         SG::_addSample(PointSample(x, y), outSamples);
      }
   }
}

// force explicit template specialization of JitteredSampleGenerator and 
// JitteredSampleGeneratorThread
#include <generators.h>
DECLARE_SAMPLE_GENERATOR(Jittered);