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task.h
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2 // Copyright 2018 Pixar
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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  HDX_API
70  void Sync(
71  HdSceneDelegate* delegate,
72  HdTaskContext* ctx,
73  HdDirtyBits* dirtyBits) override final;
74 
75 protected:
76  // This is called during the hydra Sync Phase via HdxTask::Sync.
77  // Please see HdTask::Sync for Sync Phase documentation.
78  virtual void _Sync(
79  HdSceneDelegate* delegate,
80  HdTaskContext* ctx,
81  HdDirtyBits* dirtyBits) = 0;
82 
83  // Swaps the color target and colorIntermediate target.
84  // This is used when a task wishes to read from the color and also write
85  // to it. We use two color targets and ping-pong between them.
86  HDX_API
88 
89  // Swaps the depth target and depthIntermediate target.
90  // This is used when a task wishes to read from the depth and also write
91  // to it. We use two depth targets and ping-pong between them.
92  HDX_API
94 
95  // Helper function to facilitate texture ping-ponging.
96  HDX_API
97  void _SwapTextures(
98  HdTaskContext* ctx,
99  const TfToken& textureToken,
100  const TfToken& textureIntermediateToken);
101 
102  // Return pointer to Hydra Graphics Interface.
103  HDX_API
104  Hgi* _GetHgi() const;
105 
106 private:
107  Hgi* _hgi;
108 };
109 
111 
112 #endif
113 
uint32_t HdDirtyBits
Definition: types.h:158
virtual void _Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits)=0
#define HDX_API
Definition: api.h:40
HDX_API void _SwapTextures(HdTaskContext *ctx, const TfToken &textureToken, const TfToken &textureIntermediateToken)
Definition: token.h:87
HDX_API HdxTask(SdfPath const &id)
virtual HDX_API bool IsConverged() const
Definition: task.h:54
Definition: path.h:291
std::unordered_map< TfToken, VtValue, TfToken::HashFunctor > HdTaskContext
Definition: renderIndex.h:77
HDX_API void Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits) overridefinal
Definition: task.h:44
Definition: hgi.h:110
HDX_API void _ToggleRenderTarget(HdTaskContext *ctx)
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1441
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:91
HDX_API Hgi * _GetHgi() const
HDX_API void _ToggleDepthTarget(HdTaskContext *ctx)
HDX_API ~HdxTask() override