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renderBuffer.h
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1 //
2 // Copyright 2019 Pixar
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4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
6 // compliance with the Apache License and the following modification to it:
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24 #ifndef PXR_IMAGING_HD_ST_RENDER_BUFFER_H
25 #define PXR_IMAGING_HD_ST_RENDER_BUFFER_H
26 
27 #include "pxr/pxr.h"
28 #include "pxr/base/gf/vec3i.h"
29 #include "pxr/imaging/hdSt/api.h"
31 #include "pxr/imaging/hgi/hgi.h"
32 #include "pxr/imaging/hgi/enums.h"
34 
36 
40  std::shared_ptr<class HdStDynamicUvTextureObject>;
41 
43 {
44 public:
45  HDST_API
46  HdStRenderBuffer(HdStResourceRegistry *resourceRegistry, SdfPath const& id);
47 
48  HDST_API
49  ~HdStRenderBuffer() override;
50 
51  HDST_API
52  void Sync(HdSceneDelegate *sceneDelegate,
53  HdRenderParam *renderParam,
54  HdDirtyBits *dirtyBits) override;
55 
56  HDST_API
57  bool Allocate(GfVec3i const& dimensions,
59  bool multiSampled) override;
60 
61  HDST_API
62  unsigned int GetWidth() const override;
63 
64  HDST_API
65  unsigned int GetHeight() const override;
66 
67  HDST_API
68  unsigned int GetDepth() const override;
69 
70  HDST_API
71  HdFormat GetFormat() const override {return _format;}
72 
73  HDST_API
74  bool IsMultiSampled() const override;
75 
76  /// Map the buffer for reading. The control flow should be Map(),
77  /// before any I/O, followed by memory access, followed by Unmap() when
78  /// done.
79  /// \return The address of the buffer.
80  HDST_API
81  void* Map() override;
82 
83  /// Unmap the buffer.
84  HDST_API
85  void Unmap() override;
86 
87  /// Return whether any clients have this buffer mapped currently.
88  /// \return True if the buffer is currently mapped by someone.
89  HDST_API
90  bool IsMapped() const override {
91  return _mappers.load() != 0;
92  }
93 
94  /// Is the buffer converged?
95  /// \return True if the buffer is converged (not currently being
96  /// rendered to).
97  HDST_API
98  bool IsConverged() const override {
99  return true;
100  }
101 
102  /// Resolve the sample buffer into final values.
103  HDST_API
104  void Resolve() override;
105 
106  /// Returns the texture handle.
107  HDST_API
108  VtValue GetResource(bool multiSampled) const override;
109 
110  /// The identifier that can be passed to, e.g.,
111  /// HdStResourceRegistry::AllocateTextureHandle so that a
112  /// shader can bind this buffer as texture.
113  HDST_API
115  bool multiSampled);
116 
117 protected:
118  void _Deallocate() override;
119 
120 private:
121  // HdRenderBuffer::Allocate should take a scene delegate or
122  // resource registry so that we do not need to save it here.
123  HdStResourceRegistry * _resourceRegistry;
124 
125  // Format saved here (somewhat redundantely) since the
126  // Hgi texture descriptor holds an HgiFormat instead of HdFormat.
127  HdFormat _format;
128 
129  uint32_t _msaaSampleCount;
130 
131  // The GPU texture resource
133 
134  // The GPU multi-sample texture resource (optional)
135  HdStDynamicUvTextureObjectSharedPtr _textureMSAAObject;
136 
137  // The number of callers mapping this buffer.
138  std::atomic<int> _mappers;
139  // Texels are temp captured into this buffer between map and unmap.
140  std::vector<uint8_t> _mappedBuffer;
141 };
142 
144 
145 #endif
HDST_API void * Map() override
HdFormat
Definition: types.h:390
uint32_t HdDirtyBits
Definition: types.h:127
HDST_API bool IsConverged() const override
Definition: renderBuffer.h:98
HDST_API HdStTextureIdentifier GetTextureIdentifier(bool multiSampled)
void _Deallocate() override
Deallocate the buffer, freeing any owned resources.
HDST_API bool IsMapped() const override
Definition: renderBuffer.h:90
HDST_API VtValue GetResource(bool multiSampled) const override
Returns the texture handle.
Definition: vec3i.h:61
HDST_API bool Allocate(GfVec3i const &dimensions, HdFormat format, bool multiSampled) override
HDST_API void Sync(HdSceneDelegate *sceneDelegate, HdRenderParam *renderParam, HdDirtyBits *dirtyBits) override
Get allocation information from the scene delegate.
HDST_API HdFormat GetFormat() const override
Get the buffer's per-pixel format.
Definition: renderBuffer.h:71
Definition: path.h:288
HDST_API unsigned int GetWidth() const override
Get the buffer's width.
HDST_API unsigned int GetDepth() const override
Get the buffer's depth.
HDST_API HdStRenderBuffer(HdStResourceRegistry *resourceRegistry, SdfPath const &id)
HDST_API ~HdStRenderBuffer() override
std::shared_ptr< class HdStDynamicUvTextureObject > HdStDynamicUvTextureObjectSharedPtr
Definition: renderBuffer.h:40
GLint GLint GLsizei GLint GLenum format
Definition: glcorearb.h:107
HDST_API bool IsMultiSampled() const override
Get whether the buffer is multisampled.
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1375
#define HDST_API
Definition: api.h:40
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:91
HDST_API void Resolve() override
Resolve the sample buffer into final values.
HDST_API unsigned int GetHeight() const override
Get the buffer's height.
Definition: value.h:168
HDST_API void Unmap() override
Unmap the buffer.