OrenNayar.h

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#pragma once
 
#include "Core/SurfaceBehavior/SurfaceOptics.h"
#include "Core/Texture/TTexture.h"
#include "Math/Color/Spectrum.h"
 
#include <Common/primitive_type.h>
 
#include <memory>
 
namespace ph
{
 
class OrenNayar : public SurfaceOptics
{
public:
    OrenNayar(
        const std::shared_ptr<TTexture<math::Spectrum>>& albedo,
        real sigmaDegrees);
 
    OrenNayar(
        const std::shared_ptr<TTexture<math::Spectrum>>& albedo,
        const std::shared_ptr<TTexture<real>>&           sigmaDegrees);
 
    ESurfacePhenomenon getPhenomenonOf(SurfaceElemental elemental) const override;
 
    std::string toString() const override;
 
private:
    void calcBsdf(
        const BsdfQueryContext& ctx,
        const BsdfEvalInput&    in,
        BsdfEvalOutput&         out) const override;
 
    void genBsdfSample(
        const BsdfQueryContext& ctx,
        const BsdfSampleInput&  in,
        SampleFlow&             sampleFlow,
        BsdfSampleOutput&       out) const override;
 
    void calcBsdfPdf(
        const BsdfQueryContext& ctx,
        const BsdfPdfInput&     in,
        BsdfPdfOutput&          out) const override;
 
private:
    std::shared_ptr<TTexture<math::Spectrum>> m_albedo;
    std::shared_ptr<TTexture<real>>           m_sigmaDegrees;
};
 
// In-header Implementations:
 
inline std::string OrenNayar::toString() const
{
    return "Oren Nayar, " + SurfaceOptics::toString();
}
 
}// end namespace ph