selectionTask.h

//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HDX_SELECTION_TASK_H
#define PXR_IMAGING_HDX_SELECTION_TASK_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdx/api.h"
#include "pxr/imaging/hdx/version.h"
#include "pxr/imaging/hd/task.h"
 
#include "pxr/base/gf/vec4f.h"
 
#include <memory>
 
PXR_NAMESPACE_OPEN_SCOPE
 
 
class HdRenderIndex;
class HdSceneDelegate;
 
struct HdxSelectionTaskParams
{
    bool enableSelectionHighlight;
    bool enableLocateHighlight;
    float occludedSelectionOpacity; // lerp factor when blending 
                                    // occluded selection
    GfVec4f selectionColor; // "active" selection color
    GfVec4f locateColor; // "rollover" selection color
};
 
using HdBufferArrayRangeSharedPtr = std::shared_ptr<class HdBufferArrayRange>;
 
class HdxSelectionTask : public HdTask
{
public:
    using TaskParams = HdxSelectionTaskParams;
 
    HDX_API
    HdxSelectionTask(HdSceneDelegate* delegate, SdfPath const& id);
 
    HDX_API
    ~HdxSelectionTask() override;
 
    HDX_API
    void Sync(HdSceneDelegate* delegate,
              HdTaskContext* ctx,
              HdDirtyBits* dirtyBits) override;
    
 
    HDX_API
    void Prepare(HdTaskContext* ctx,
                 HdRenderIndex* renderIndex) override;
 
    HDX_API
    void Execute(HdTaskContext* ctx) override;
 
 
private:
    int _lastVersion;
    bool _hasSelection;
    HdxSelectionTaskParams _params;
    HdBufferArrayRangeSharedPtr _selOffsetBar;
    HdBufferArrayRangeSharedPtr _selUniformBar;
    size_t _pointColorsBufferSize;
 
    HdxSelectionTask() = delete;
    HdxSelectionTask(const HdxSelectionTask &) = delete;
    HdxSelectionTask &operator =(const HdxSelectionTask &) = delete;
};
 
// VtValue requirements
HDX_API
std::ostream& operator<<(std::ostream& out,
                         const HdxSelectionTaskParams& pv);
HDX_API
bool operator==(const HdxSelectionTaskParams& lhs,
                const HdxSelectionTaskParams& rhs);
HDX_API
bool operator!=(const HdxSelectionTaskParams& lhs,
                const HdxSelectionTaskParams& rhs);
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif //PXR_IMAGING_HDX_SELECTION_TASK_H