TDirectLightEstimator.h

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#pragma once
 
#include "Math/math_fwd.h"
#include "Math/Color/Spectrum.h"
#include "Core/LTA/SidednessAgreement.h"
 
#include <Common/primitive_type.h>
 
#include <optional>
 
namespace ph { class Scene; }
namespace ph { class SurfaceHit; }
namespace ph { class SampleFlow; }
namespace ph { class Emitter; }
namespace ph { class Primitive; }
namespace ph { class SurfaceOptics; }
namespace ph { class BsdfSampleQuery; }
namespace ph { class DirectEnergySampleQuery; }
 
namespace ph::lta
{
 
template<ESidednessPolicy POLICY>
class TDirectLightEstimator final
{
public:
    explicit TDirectLightEstimator(const Scene* scene);
 
    [[nodiscard]]
    bool bsdfSampleEmission(
        BsdfSampleQuery&           bsdfSample,
        SampleFlow&                sampleFlow,
        math::Spectrum*            out_Le = nullptr,
        std::optional<SurfaceHit>* out_X = nullptr) const;
 
    [[nodiscard]]
    bool neeSampleEmission(
        DirectEnergySampleQuery&   directSample,
        SampleFlow&                sampleFlow,
        SurfaceHit*                out_Xe = nullptr) const;
 
    [[nodiscard]]
    bool bsdfSamplePathWithNee(
        BsdfSampleQuery&           bsdfSample,
        SampleFlow&                sampleFlow,
        math::Spectrum*            out_Lo = nullptr,
        std::optional<SurfaceHit>* out_X = nullptr) const;
 
    [[nodiscard]]
    real neeSamplePdfWUnoccluded(
        const SurfaceHit&          X,
        const SurfaceHit&          Xe) const;
 
    [[nodiscard]]
    bool isNeeSamplable(const SurfaceHit& X) const;
 
private:
    const Scene& getScene() const;
 
    const Scene* m_scene;
};
 
}// end namespace ph::lta
 
#include "Core/LTA/TDirectLightEstimator.ipp"