SurfaceEmitter.h

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#pragma once
 
#include "Common/primitive_type.h"
#include "Math/math_fwd.h"
#include "Math/Transform/Transform.h"
#include "Math/Color/Spectrum.h"
#include "Core/Emitter/Emitter.h"
#include "Core/Texture/TTexture.h"
#include "Core/LTA/PDF.h"
 
#include <memory>
 
namespace ph { class Primitive; }
 
namespace ph
{
 
class SurfaceEmitter : public Emitter
{
public:
    explicit SurfaceEmitter(EmitterFeatureSet featureSet = defaultFeatureSet);
 
    void evalEmittedEnergy(const SurfaceHit& Xe, math::Spectrum* out_energy) const override = 0;
 
    void genDirectSample(
        DirectEnergySampleQuery& query, 
        SampleFlow& sampleFlow,
        HitProbe& probe) const override = 0;
 
    void calcDirectPdf(DirectEnergyPdfQuery& query) const override = 0;
 
    void emitRay(
        EnergyEmissionSampleQuery& query,
        SampleFlow& sampleFlow,
        HitProbe& probe) const override = 0;
    
    virtual void setFrontFaceEmit();
    virtual void setBackFaceEmit();
 
protected:
    bool canEmit(const math::Vector3R& emitDir, const math::Vector3R& N) const;
 
    void calcDirectPdfWForSrcPrimitive(
        DirectEnergyPdfQuery& query,
        const lta::PDF& pickPdf = lta::PDF::D(1),
        const lta::PDF& emitPosUvwPdf = {}) const;
 
    bool m_isBackFaceEmission;
};
 
}// end namespace ph