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task.h
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1 //
2 // Copyright 2018 Pixar
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5 // with the following modification; you may not use this file except in
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24 #ifndef PXR_IMAGING_HDX_TASK_H
25 #define PXR_IMAGING_HDX_TASK_H
26 
27 #include "pxr/pxr.h"
28 #include "pxr/imaging/hdx/api.h"
29 #include "pxr/imaging/hd/task.h"
30 
32 
33 class Hgi;
34 
35 
36 /// \class HdxTask
37 ///
38 /// Base class for (some) tasks in Hdx that provides common progressive
39 /// rendering and Hgi functionality.
40 ///
41 /// Tasks that require neither progressive rendering nor Hgi can continue to
42 /// derive directly from HdTask.
43 ///
44 class HdxTask : public HdTask
45 {
46 public:
47  HDX_API
48  HdxTask(SdfPath const& id);
49 
50  HDX_API
51  ~HdxTask() override;
52 
53  /// This function returns true when a (progressive) task considers its
54  /// execution results converged. Usually this means that a progressive
55  /// render delegate is finished rendering into the HdRenderBuffers used by
56  /// this task.
57  /// Returns true by default which is a good default for rasterizers.
58  ///
59  /// Applications with data-driven task lists can determine their convergence
60  /// state by determining which tasks are HdxTasks and then querying
61  /// specifically those tasks for IsConverged.
62  HDX_API
63  virtual bool IsConverged() const;
64 
65  /// We override HdTask::Sync, but make it 'final' to make sure derived
66  /// classes can't override it and instead override _Sync.
67  /// This 'non-virtual interface'-like pattern allows us to ensure we always
68  /// initialized Hgi during the Sync task so derived classes don't have to.
69  void Sync(
70  HdSceneDelegate* delegate,
71  HdTaskContext* ctx,
72  HdDirtyBits* dirtyBits) final;
73 
74 protected:
75  // This is called during the hydra Sync Phase via HdxTask::Sync.
76  // Please see HdTask::Sync for Sync Phase documentation.
77  virtual void _Sync(
78  HdSceneDelegate* delegate,
79  HdTaskContext* ctx,
80  HdDirtyBits* dirtyBits) = 0;
81 
82  // Swaps the color target and colorIntermediate target.
83  // This is used when a task wishes to read from the color and also write
84  // to it. We use two color targets and ping-pong between them.
86 
87  // Return pointer to Hydra Graphics Interface.
88  HDX_API
89  Hgi* _GetHgi() const;
90 
92 };
93 
95 
96 #endif
97 
void Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits) final
Hgi * _hgi
Definition: task.h:91
uint32_t HdDirtyBits
Definition: types.h:127
virtual void _Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits)=0
#define HDX_API
Definition: api.h:40
HDX_API HdxTask(SdfPath const &id)
virtual HDX_API bool IsConverged() const
Definition: task.h:54
Definition: path.h:288
void _ToggleRenderTarget(HdTaskContext *ctx)
std::unordered_map< TfToken, VtValue, TfToken::HashFunctor > HdTaskContext
Definition: renderIndex.h:72
Definition: task.h:44
Definition: hgi.h:106
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1375
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:91
HDX_API Hgi * _GetHgi() const
HDX_API ~HdxTask() override