EmitterSampler.h

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#pragma once
 
#include "Math/math_fwd.h"
#include "Utility/TSpan.h"
 
#include <Common/primitive_type.h>
 
#include <memory>
#include <vector>
 
namespace ph
{
 
class Emitter;
class DirectEnergySampleQuery;
class DirectEnergyPdfQuery;
class HitProbe;
class SurfaceHit;
class SampleFlow;
 
class EmitterSampler
{
public:
    virtual ~EmitterSampler();
 
    virtual void update(TSpanView<const Emitter*> emitters) = 0;
    virtual const Emitter* pickEmitter(SampleFlow& sampleFlow, real* out_PDF) const = 0;
 
    virtual void genDirectSample(
        DirectEnergySampleQuery& query, 
        SampleFlow& sampleFlow,
        HitProbe& probe) const = 0;
 
    virtual void calcDirectPdf(DirectEnergyPdfQuery& query) const = 0;
};
 
}// end namespace ph