task.h

//
// Copyright 2018 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HDX_TASK_H
#define PXR_IMAGING_HDX_TASK_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdx/api.h"
#include "pxr/imaging/hd/task.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class Hgi;
 
 
class HdxTask : public HdTask
{
public:
    HDX_API
    HdxTask(SdfPath const& id);
 
    HDX_API
    ~HdxTask() override;
 
    static
    HDX_API
    bool AreTasksConverged(HdRenderIndex * const renderIndex,
                           const SdfPathVector &taskPaths);
 
    HDX_API 
    void Sync(
        HdSceneDelegate* delegate,
        HdTaskContext* ctx,
        HdDirtyBits* dirtyBits) override final;
 
protected:
    // This is called during the hydra Sync Phase via HdxTask::Sync.
    // Please see HdTask::Sync for Sync Phase documentation.
    virtual void _Sync(
        HdSceneDelegate* delegate,
        HdTaskContext* ctx,
        HdDirtyBits* dirtyBits) = 0;
 
    // Swaps the color target and colorIntermediate target.
    // This is used when a task wishes to read from the color and also write
    // to it. We use two color targets and ping-pong between them.
    HDX_API
    void _ToggleRenderTarget(HdTaskContext* ctx);
 
    // Swaps the depth target and depthIntermediate target.
    // This is used when a task wishes to read from the depth and also write
    // to it. We use two depth targets and ping-pong between them.
    HDX_API
    void _ToggleDepthTarget(HdTaskContext* ctx);
 
    // Helper function to facilitate texture ping-ponging.
    HDX_API
    void _SwapTextures(
        HdTaskContext* ctx,
        const TfToken& textureToken,
        const TfToken& textureIntermediateToken);
 
    // Return pointer to Hydra Graphics Interface.
    HDX_API
    Hgi* _GetHgi() const;
 
private:
    Hgi* _hgi;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif