ESPowerFavoring.h

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#pragma once
 
#include "Core/Emitter/Sampler/EmitterSampler.h"
#include "Math/Random/TPwcDistribution1D.h"
 
#include <vector>
#include <unordered_map>
 
namespace ph
{
 
class ESPowerFavoring : public EmitterSampler
{
public:
    void update(TSpanView<const Emitter*> emitters) override;
    const Emitter* pickEmitter(SampleFlow& sampleFlow, real* out_PDF) const override;
 
    void genDirectSample(
        DirectEnergySampleQuery& query,
        SampleFlow& sampleFlow,
        HitProbe& probe) const override;
 
    void calcDirectPdf(DirectEnergyPdfQuery& query) const override;
 
private:
    std::vector<const Emitter*>    m_emitters;
    math::TPwcDistribution1D<real> m_distribution;
 
    std::unordered_map<
        const Emitter*, std::size_t
    > m_emitterToIndexMap;
};
 
}// end namespace ph