RixDisplacement.h

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#ifndef RixDisplacement_h
#define RixDisplacement_h

#include "RixShading.h"                 // for RixShadingPlugin
#include "ri.h"                         // for RtConstPointer, RtPoint3

class RixDisplacement;

class RixDisplacementFactory : public RixShadingPlugin
{
public:
    virtual int GetInterface() const override { return k_RixDisplacementFactory; }

    virtual RixDisplacement* BeginDisplacement(
        RixShadingContext const*,
        RixSCShadingMode,
        RtPointer instanceData) = 0;

    virtual void EndDisplacement(class RixDisplacement* disp) = 0;

protected:
    RixDisplacementFactory() : RixShadingPlugin(k_RixShadingVersion) {}
    virtual ~RixDisplacementFactory() {}
};

class RixDisplacement
{
public:
    RixDisplacement(RixShadingContext const* sCtx, RixDisplacementFactory* fact)
        : shadingCtx(sCtx), displacementFactory(fact)
    {
    }

    virtual ~RixDisplacement() {}

    virtual bool GetDisplacement(RtPoint3* P) = 0;

    RixShadingContext const* GetShadingCtx() const { return shadingCtx; }

    RixDisplacementFactory* GetDisplacementFactory() const
    {
        return displacementFactory;
    }

    virtual void Release()
    {
        if (displacementFactory)
            displacementFactory->EndDisplacement(this);
    }

protected:
    RixShadingContext const* shadingCtx;
    RixDisplacementFactory* displacementFactory;
};

// clang-format off
#define RIX_DISPLACEMENTCREATE \
    extern "C" PRMANEXPORT RixDisplacementFactory* CreateRixDisplacementFactory(const char* hint)

#define RIX_DISPLACEMENTDESTROY \
    extern "C" PRMANEXPORT void DestroyRixDisplacementFactory(RixDisplacementFactory* bxdf)
// clang-format on

#endif