BsdfHelper.h

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#pragma once
 
#include "Math/TVector3.h"
#include "Math/math.h"
 
#include <Common/assertion.h>
 
namespace ph
{
 
class BsdfHelper final
{
public:
    static inline bool makeHalfVector(
        const math::Vector3R& L, const math::Vector3R& V,
        math::Vector3R* const out_H)
    {
        PH_ASSERT(out_H);
 
        *out_H = L.add(V);
        if(out_H->isZero())
        {
            return false;
        }
        else
        {
            out_H->normalizeLocal();
            return true;
        }
    }
 
    static inline bool makeHalfVectorSameHemisphere(
        const math::Vector3R& L, const math::Vector3R& V, const math::Vector3R& N,
        math::Vector3R* const out_H)
    {
        PH_ASSERT(out_H);
 
        if(!makeHalfVector(L, V, out_H))
        {
            return false;
        }
 
        out_H->mulLocal(static_cast<real>(math::sign(N.dot(*out_H))));
        return !out_H->isZero();
    }
};
 
}// end namespace ph