TIndirectLightEstimator.h

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#pragma once
 
#include "Math/math_fwd.h"
#include "Math/Color/Spectrum.h"
#include "Core/LTA/SidednessAgreement.h"
 
#include <cstddef>
 
namespace ph { class Scene; }
namespace ph { class SurfaceHit; }
namespace ph { class SampleFlow; }
 
namespace ph::lta
{
 
class RussianRoulette;
 
template<ESidednessPolicy POLICY>
class TIndirectLightEstimator final
{
public:
    explicit TIndirectLightEstimator(const Scene* scene);
 
    [[nodiscard]]
    bool bsdfSamplePathWithNee(
        const SurfaceHit&      X,
        SampleFlow&            sampleFlow,
        std::size_t            pathLength,
        const RussianRoulette& rr,
        math::Spectrum*        out_Lo = nullptr,
        std::size_t            rrBeginPathLength = 0,
        const math::Spectrum&  initialPathWeight = math::Spectrum(1)) const;
 
    [[nodiscard]]
    bool bsdfSamplePathWithNee(
        const SurfaceHit&      X,
        SampleFlow&            sampleFlow,
        std::size_t            minPathLength,
        std::size_t            maxPathLength,
        const RussianRoulette& rr,
        math::Spectrum*        out_Lo = nullptr,
        std::size_t            rrBeginPathLength = 0, 
        const math::Spectrum&  initialPathWeight = math::Spectrum(1)) const;
 
private:
    const Scene* m_scene;
};
 
}// end namespace ph::lta
 
#include "Core/LTA/TIndirectLightEstimator.ipp"