SurfaceOptics.h

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#pragma once
 
#include "Core/SurfaceBehavior/surface_optics_fwd.h"
#include "Core/SurfaceBehavior/bsdf_query_fwd.h"
 
#include <string>
#include <array>
 
namespace ph
{
 
class SampleFlow;
 
class SurfaceOptics
{
    // FIXME: sort-of hacked, should clarify the need of this in the future
    friend class LerpedSurfaceOptics;
 
public:
    SurfaceOptics();
    virtual ~SurfaceOptics() = default;
 
    virtual ESurfacePhenomenon getPhenomenonOf(SurfaceElemental elemental) const = 0;
 
    void calcBsdf(BsdfEvalQuery& eval) const;
 
    void genBsdfSample(BsdfSampleQuery& sample, SampleFlow& sampleFlow) const;
 
    void calcBsdfPdf(BsdfPdfQuery& pdfQuery) const;
 
    SurfacePhenomena getAllPhenomena() const;
 
    SurfaceElemental numElementals() const;
 
    virtual std::string toString() const;
 
protected:
    SurfacePhenomena m_phenomena;
    SurfaceElemental m_numElementals;
 
private:
    virtual void calcBsdf(
        const BsdfQueryContext& ctx,
        const BsdfEvalInput&    in,
        BsdfEvalOutput&         out) const = 0;
 
    virtual void genBsdfSample(
        const BsdfQueryContext& ctx,
        const BsdfSampleInput&  in,
        SampleFlow&             sampleFlow,
        BsdfSampleOutput&       out) const = 0;
 
    virtual void calcBsdfPdf(
        const BsdfQueryContext& ctx,
        const BsdfPdfInput&     in,
        BsdfPdfOutput&          out) const = 0;
};
 
// In-header Implementations:
 
inline SurfacePhenomena SurfaceOptics::getAllPhenomena() const
{
    return m_phenomena;
}
 
inline SurfaceElemental SurfaceOptics::numElementals() const
{
    return m_numElementals;
}
 
inline std::string SurfaceOptics::toString() const
{
    return std::to_string(m_numElementals) + " elementals";
}
 
}// end namespace ph