LatLongEnvEmitter.h

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#pragma once
 
#include "Core/Emitter/SurfaceEmitter.h"
#include "Math/Color/Spectrum.h"
#include "Core/Texture/TTexture.h"
#include "Math/Random/TPwcDistribution2D.h"
#include "Math/TVector2.h"
 
#include <memory>
#include <cstddef>
 
namespace ph
{
 
class Primitive;
 
class LatLongEnvEmitter : public SurfaceEmitter
{
public:
    using RadianceTexture = std::shared_ptr<TTexture<math::Spectrum>>;
 
    LatLongEnvEmitter(
        const Primitive*         envSurface,
        const RadianceTexture&   radiance,
        const math::Vector2S&    resolution,
        EmitterFeatureSet        featureSet = defaultFeatureSet);
 
    void evalEmittedEnergy(const SurfaceHit& Xe, math::Spectrum* out_energy) const override;
 
    void genDirectSample(
        DirectEnergySampleQuery& query,
        SampleFlow& sampleFlow,
        HitProbe& probe) const override;
 
    void calcDirectPdf(DirectEnergyPdfQuery& query) const override;
 
    void emitRay(
        EnergyEmissionSampleQuery& query,
        SampleFlow& sampleFlow,
        HitProbe& probe) const override;
 
    real calcRadiantFluxApprox() const override;
 
    void setFrontFaceEmit() override;
    void setBackFaceEmit() override;
 
private:
    const Primitive*               m_envSurface;
    RadianceTexture                m_radiance;
    math::TPwcDistribution2D<real> m_sampleDistribution;
    real                           m_radiantFluxApprox;
};
 
}// end namespace ph