Function GenerateIntegrationSamples

BakingLab/PathTracer.cpp:207–246

Generates a full list of sample points for all integration types

// Generates a full list of sample points for all integration types
void GenerateIntegrationSamples(IntegrationSamples& samples, uint64 sqrtNumSamples, uint64 tileSizeX, uint64 tileSizeY,
                                SampleModes sampleMode, uint64 numIntegrationTypes, Random& rng)
{
    const uint64 numSamplesPerPixel = sqrtNumSamples * sqrtNumSamples;
    const uint64 numTilePixels = tileSizeX * tileSizeY;
    const uint64 numSamplesPerTile = numSamplesPerPixel * numTilePixels;
    samples.Init(numTilePixels, numIntegrationTypes, numSamplesPerPixel);

    for(uint64 pixelIdx = 0; pixelIdx < numTilePixels; ++pixelIdx)
    {
        for(uint64 typeIdx = 0; typeIdx < numIntegrationTypes; ++typeIdx)
        {
            Float2* typeSamples = samples.GetSamplesForType(pixelIdx, typeIdx);
            if(sampleMode == SampleModes::Stratified)
            {
                GenerateStratifiedSamples2D(typeSamples, sqrtNumSamples, sqrtNumSamples, rng);
                Shuffle(typeSamples, numSamplesPerPixel, rng);
            }
            else if(sampleMode == SampleModes::UniformGrid)
            {
                GenerateGridSamples2D(typeSamples, sqrtNumSamples, sqrtNumSamples);
                Shuffle(typeSamples, numSamplesPerPixel, rng);
            }
            else if(sampleMode == SampleModes::Hammersley)
            {
                GenerateHammersleySamples2D(typeSamples, numSamplesPerPixel, typeIdx);
                Shuffle(typeSamples, numSamplesPerPixel, rng);
            }
            else if(sampleMode == SampleModes::CMJ)
            {
                GenerateCMJSamples2D(typeSamples, sqrtNumSamples, sqrtNumSamples, rng.RandomUint());
                Shuffle(typeSamples, numSamplesPerPixel, rng);
            }
            else
            {
                GenerateRandomSamples2D(typeSamples, numSamplesPerPixel, rng);
            }
        }
    }
}

// Returns the incoming radiance along the ray specified by params.RayDir, computed using unidirectional
// path tracing