datalessExecutor.h

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//
// Copyright 2025 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_EXEC_VDF_DATALESS_EXECUTOR_H
#define PXR_EXEC_VDF_DATALESS_EXECUTOR_H
 
 
#include "pxr/pxr.h"
 
#include "pxr/exec/vdf/api.h"
#include "pxr/exec/vdf/executorInterface.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class VdfOutput;
class VdfVector;
 
 
class VDF_API_TYPE VdfDatalessExecutor : public VdfExecutorInterface
{
public:
 
    VDF_API
    virtual ~VdfDatalessExecutor();
 
    VDF_API
    virtual void SetOutputValue(
        const VdfOutput &output,
        const VdfVector &value,
        const VdfMask &mask);
 
    VDF_API
    virtual bool TakeOutputValue(
        const VdfOutput &output,
        VdfVector *value,
        const VdfMask &mask);
 
    virtual bool IsEmpty() const {
        return true;
    }
 
protected:
 
    VDF_API
    VdfDatalessExecutor();
 
    virtual const VdfVector *_GetInputValue(
        const VdfConnection &connection,
        const VdfMask &mask) const override {
        return NULL;
    }
 
    virtual const VdfVector *_GetOutputValueForReading(
        const VdfOutput &output,
        const VdfMask &mask) const override {
        return NULL;
    }
 
    virtual VdfVector *_GetOutputValueForWriting(
        const VdfOutput &output) const override {
        return NULL;
    }
 
    void _ClearDataForOutput(
        const VdfId outputId, const VdfId nodeId) override {}
 
    virtual void _ClearData() {}
 
    virtual void _UpdateInvalidationTimestamp() {}
 
    VDF_API
    virtual void _SetReferenceOutputValue(
        const VdfOutput &destOutput,
        const VdfOutput &sourceOutput,
        const VdfMask &sourceMask) const;
 
    virtual void _TouchOutput(const VdfOutput &output) const {}
 
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif