IsoTrowbridgeReitzTextured.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/IsoTrowbridgeReitz.h"
#include "Core/Texture/TTexture.h"
#include "Core/Texture/TSampler.h"
 
#include <Common/assertion.h>
 
#include <memory>
 
namespace ph
{
 
class IsoTrowbridgeReitzTextured : public IsoTrowbridgeReitz
{
public:
    IsoTrowbridgeReitzTextured(
        const std::shared_ptr<TTexture<real>>& alpha,
        EMaskingShadowing maskingShadowingType);
 
    std::array<real, 2> getAlphas(const SurfaceHit& X) const override;
 
private:
    std::shared_ptr<TTexture<real>> m_alpha;
};
 
// In-header Implementations:
 
inline IsoTrowbridgeReitzTextured::IsoTrowbridgeReitzTextured(
    const std::shared_ptr<TTexture<real>>& alpha,
    const EMaskingShadowing maskingShadowingType)
 
    : IsoTrowbridgeReitz(maskingShadowingType)
 
    , m_alpha(alpha)
{}
 
inline std::array<real, 2> IsoTrowbridgeReitzTextured::getAlphas(const SurfaceHit& X) const
{
    PH_ASSERT(m_alpha);
 
    const real alpha = TSampler<real>().sample(*m_alpha, X);
    return {alpha, alpha};
}
 
}// end namespace ph