Receiver.h

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#pragma once
 
#include "Math/TVector2.h"
#include "Math/TVector3.h"
#include "Math/Color/Spectrum.h"
 
#include <Common/assertion.h>
#include <Common/primitive_type.h>
 
namespace ph::math { class RigidTransform; }
 
namespace ph
{
 
class Ray;
class RayDifferential;
 
class Receiver
{
    // TODO: time
    // TODO: sample flow
 
public:
    explicit Receiver(const math::RigidTransform* receiverToWorld);
 
    inline virtual ~Receiver() = default;
 
    virtual math::Spectrum receiveRay(const math::Vector2D& rasterCoord, Ray* out_ray) const = 0;
 
    // Given a ray generated by receiveRay() along with the parameters for it, 
    // calculates differential information on the origin of the ray.
    // The default implementation uses numerical differentiation for 
    // the differentials.
    /*virtual void calcSensedRayDifferentials(const math::Vector2R& filmNdcPos, const Ray& sensedRay,
                                            RayDifferential* out_result) const;*/
 
    virtual void evalEmittedImportanceAndPdfW(const math::Vector3R& targetPos, math::Vector2R* const out_filmCoord, math::Vector3R* const out_importance, real* out_filmArea, real* const out_pdfW) const = 0;
 
    const math::RigidTransform& getReceiverToWorld() const;
 
private:
    const math::RigidTransform* m_receiverToWorld;
};
 
// In-header Implementations:
 
inline const math::RigidTransform& Receiver::getReceiverToWorld() const
{
    PH_ASSERT(m_receiverToWorld);
 
    return *m_receiverToWorld;
}
 
}// end namespace ph