RixDisplayFilter.h

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#ifndef RixDisplayFilter_h
#define RixDisplayFilter_h

#include "RixIntegrator.h"              // for RixChannelId
#include "RixInterfaces.h"              // for RixContext
#include "RixShading.h"                 // for RixShadingPlugin, etc
#include "prmanapi.h"                   // for PRMANEXPORT
#include "ri.h"                         // for RtConstPointer, RtColorRGB

class RixDisplayFilterContext;


class RixDisplayFilter : public RixShadingPlugin
{
public:
    virtual int GetInterface() const override { return k_RixDisplayFilter; }


    virtual void Filter(
        RixDisplayFilterContext& fCtx,
        RtPointer instanceData) = 0;

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

// clang-format off
#define RIX_DISPLAYFILTERCREATE \
    extern "C" PRMANEXPORT RixDisplayFilter* CreateRixDisplayFilter(RtConstString hint)

#define RIX_DISPLAYFILTERDESTROY \
    extern "C" PRMANEXPORT void DestroyRixDisplayFilter(RixDisplayFilter* filter)
// clang-format on

class RixDisplayFilterContext : public RixContext
{
public:

    int xmin;
    int xmax;
    int ymin;
    int ymax;


    virtual bool Read(RixChannelId id, int x, int y, RtColorRGB &value) const = 0;
    virtual bool Read(RixChannelId id, int x, int y, float &value) const = 0;
    virtual bool Read(RixChannelId id, int x, int y, int &value) const = 0;

    virtual bool Write(RixChannelId id, int x, int y, RtColorRGB value) = 0;
    virtual bool Write(RixChannelId id, int x, int y, float value) = 0;
    virtual bool Write(RixChannelId id, int x, int y, int value) = 0;


    virtual bool ReadRegion(RixChannelId id,
                            int regionMinX, int regionMaxX,
                            int regionMinY, int regionMaxY,
                            RtColorRGB *values) const = 0;
    virtual bool ReadRegion(RixChannelId id,
                            int regionMinX, int regionMaxX,
                            int regionMinY, int regionMaxY,
                            float *values) const = 0;


    virtual bool IsEnabled(
        RtConstPointer instance,
        RtPointer* instanceData) const = 0;

protected:
    RixDisplayFilterContext() : RixContext() {}
    virtual ~RixDisplayFilterContext() {}
};

#endif