src/RegularSampleGenerator.h

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#ifndef REGULARSAMPLEGENERATOR_H
#define REGULARSAMPLEGENERATOR_H

#include "SampleGenerator.h"
#include <cmath>

class RegularSampleGenerator : public SampleGenerator
{
public:
    void samples(int n, float u[], float v[], float weight[]) const
    {
        int x = static_cast<int>(floorf(sqrtf(n)));
        assert(x*x == n);

        // create grid of sample coordinates
        float offset = 0.5/x;
        for (int i=0; i < x; i++)
        {
            for (int j=0; j < x; j++)
            {
                if (i*x+j >= n)
                    return;
                u[i*x+j] = static_cast<float>(i)/x + offset;
                v[i*x+j] = static_cast<float>(j)/x + offset;
                weight[i*x+j] = 1.0 / float(n);
            }
        }
    }
};

#endif

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