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HdRenderIndex Class Referencefinal

The Hydra render index is a flattened representation of the client scene graph, which may be composed of several self-contained scene graphs, each of which provides a HdSceneDelegate adapter for data access. More...

Inherits noncopyable.

Public Types

typedef std::vector
< HdDrawItem const * > 
HdDrawItemPtrVector
 

Public Member Functions

HD_API void Clear ()
 Clear all r (render), s (state) and b (buffer) prims. More...
 
HD_API void RemoveSubtree (const SdfPath &root, HdSceneDelegate *sceneDelegate)
 Clear all entries in the render index under the given root and belong to a specified delegate. More...
 
HD_API SdfPath GetRprimPathFromPrimId (int primId) const
 Given a prim id, returns the path of the corresponding rprim or an empty path if none is found. More...
 
Synchronization
HD_API void Sync (HdDirtyListSharedPtr const &dirtyList, HdRprimCollection const &collection)
 Adds the dirty list to the sync queue. More...
 
HD_API void SyncAll (HdTaskSharedPtrVector *tasks, HdTaskContext *taskContext)
 Syncs input tasks, B & S prims, (external) computations and processes all pending dirty lists (which syncs the R prims). More...
 
Execution
HD_API HdDrawItemPtrVector GetDrawItems (HdRprimCollection const &collection, TfTokenVector const &renderTags)
 Returns a list of relevant draw items that match the criteria specified. More...
 
Change Tracker
HdChangeTrackerGetChangeTracker ()
 
HdChangeTracker const & GetChangeTracker () const
 
Renderable prims (e.g. meshes, basis curves)
HD_API bool IsRprimTypeSupported (TfToken const &typeId) const
 Returns whether the rprim type is supported by this render index. More...
 
HD_API void InsertRprim (TfToken const &typeId, HdSceneDelegate *sceneDelegate, SdfPath const &rprimId, SdfPath const &instancerId=SdfPath())
 Insert a rprim into index. More...
 
HD_API void RemoveRprim (SdfPath const &id)
 Remove a rprim from index. More...
 
bool HasRprim (SdfPath const &id)
 Returns true if rprim id exists in index. More...
 
HD_API HdRprim const * GetRprim (SdfPath const &id) const
 Returns the rprim of id. More...
 
HD_API HdSceneDelegateGetSceneDelegateForRprim (SdfPath const &id) const
 Returns the scene delegate for the given rprim. More...
 
HD_API bool GetSceneDelegateAndInstancerIds (SdfPath const &id, SdfPath *sceneDelegateId, SdfPath *instancerId) const
 Query function to return the id's of the scene delegate and instancer associated with the Rprim at the given path. More...
 
HD_API TfToken GetRenderTag (SdfPath const &id) const
 Returns the render tag for the given rprim. More...
 
HD_API TfToken GetMaterialTag (SdfPath const &id) const
 Return the material tag for the given rprim. More...
 
HD_API const SdfPathVector & GetRprimIds ()
 Returns a sorted list of all Rprims in the render index. More...
 
HD_API SdfPathVector GetRprimSubtree (SdfPath const &root)
 Returns the subtree rooted under the given path. More...
 
Instancer Support
HD_API void InsertInstancer (HdSceneDelegate *delegate, SdfPath const &id, SdfPath const &parentId=SdfPath())
 Insert an instancer into index. More...
 
HD_API void RemoveInstancer (SdfPath const &id)
 Remove an instancer from index. More...
 
bool HasInstancer (SdfPath const &id)
 Returns true if instancer id exists in index. More...
 
HD_API HdInstancerGetInstancer (SdfPath const &id) const
 Returns the instancer of id. More...
 
Task Support
template<typename T >
void InsertTask (HdSceneDelegate *delegate, SdfPath const &id)
 Inserts a new task into the render index with an identifier of id. More...
 
HD_API void RemoveTask (SdfPath const &id)
 Removes the given task from the RenderIndex. More...
 
bool HasTask (SdfPath const &id)
 Returns true if a task exists in the index with the given id. More...
 
HD_API HdTaskSharedPtr const & GetTask (SdfPath const &id) const
 Returns the task for the given id. More...
 
Scene state prims (e.g. camera, light)
HD_API bool IsSprimTypeSupported (TfToken const &typeId) const
 Returns whether the sprim type is supported by this render index. More...
 
HD_API void InsertSprim (TfToken const &typeId, HdSceneDelegate *delegate, SdfPath const &sprimId)
 Insert a sprim into index. More...
 
HD_API void RemoveSprim (TfToken const &typeId, SdfPath const &id)
 
HD_API HdSprim const * GetSprim (TfToken const &typeId, SdfPath const &id) const
 
HD_API SdfPathVector GetSprimSubtree (TfToken const &typeId, SdfPath const &root)
 Returns the subtree rooted under the given path for the given sprim type. More...
 
HD_API HdSprimGetFallbackSprim (TfToken const &typeId) const
 Returns the fullback prim for the Sprim of the given type. More...
 
Buffer prims (e.g. textures, buffers)
HD_API bool IsBprimTypeSupported (TfToken const &typeId) const
 Returns whether the bprim type is supported by this render index. More...
 
HD_API void InsertBprim (TfToken const &typeId, HdSceneDelegate *delegate, SdfPath const &bprimId)
 Insert a bprim into index. More...
 
HD_API void RemoveBprim (TfToken const &typeId, SdfPath const &id)
 
HD_API HdBprimGetBprim (TfToken const &typeId, SdfPath const &id) const
 
HD_API SdfPathVector GetBprimSubtree (TfToken const &typeId, SdfPath const &root)
 Returns the subtree rooted under the given path for the given bprim type. More...
 
HD_API HdBprimGetFallbackBprim (TfToken const &typeId) const
 Returns the fallback prim for the Bprim of the given type. More...
 
HD_API
HdResourceRegistry::TextureKey 
GetTextureKey (HdTextureResource::ID id) const
 Helper utility to convert texture resource id's which are unique to this render index, into a globally unique texture key. More...
 

Static Public Member Functions

static HD_API HdRenderIndexNew (HdRenderDelegate *renderDelegate)
 Create a render index with the given render delegate. More...
 

Render Delegate

HD_API HdRenderDelegate * GetRenderDelegate () const
 Currently, a render index only supports connection to one type of render delegate, due to the inserted information and change tracking being specific to that delegate type. More...
 
HD_API HdResourceRegistrySharedPtr GetResourceRegistry () const
 Returns a shared ptr to the resource registry of the current render delegate. More...
 

Detailed Description

The Hydra render index is a flattened representation of the client scene graph, which may be composed of several self-contained scene graphs, each of which provides a HdSceneDelegate adapter for data access.

Thus, multiple HdSceneDelegate's may be tied to the same HdRenderIndex.

The render index, however, is tied to a single HdRenderDelegate, which handles the actual creation and deletion of Hydra scene primitives. These include geometry and non-drawable objects (such as the camera and texture buffers). The render index simply holds a handle to these primitives, and tracks any changes to them via the HdChangeTracker. It also tracks computations and tasks that may update resources and render a subset of the renderable primitives.

The render index orchestrates the "syncing" of scene primitives, by providing the relevant scene delegate for data access, and leaves resource management to the rendering backend (via HdResourceRegistry).

It also provides "execution" functionality for application facing Hydra concepts (such as HdTask/HdRenderPass) in computing the set of HdDrawItems for a given HdRprimCollection, for rendering.

See Also
HdChangeTracker HdDrawItem HdRenderDelegate HdRprimCollection HdSceneDelegate
Note
The current design ties a HdRenderIndex to a HdRenderDelegate. However, the HdRenderIndex isn't tied to a viewer (viewport). It is common to have multiple viewers image the composed scene (for example, with different cameras), in which case the HdRenderIndex and HdRenderDelegate are shared by the viewers.

If two viewers use different HdRenderDelegate's, then it may unfortunately require populating two HdRenderIndex's.

Definition at line 119 of file renderIndex.h.

Member Function Documentation

HD_API void Clear ( )

Clear all r (render), s (state) and b (buffer) prims.

HD_API SdfPathVector GetBprimSubtree ( TfToken const &  typeId,
SdfPath const &  root 
)

Returns the subtree rooted under the given path for the given bprim type.

HD_API HdDrawItemPtrVector GetDrawItems ( HdRprimCollection const &  collection,
TfTokenVector const &  renderTags 
)

Returns a list of relevant draw items that match the criteria specified.

The is typically called during render pass execution, which is the final phase in the Hydra's execution. See HdRenderPass::Execute

HD_API HdBprim* GetFallbackBprim ( TfToken const &  typeId) const

Returns the fallback prim for the Bprim of the given type.

HD_API HdSprim* GetFallbackSprim ( TfToken const &  typeId) const

Returns the fullback prim for the Sprim of the given type.

HD_API HdInstancer* GetInstancer ( SdfPath const &  id) const

Returns the instancer of id.

HD_API TfToken GetMaterialTag ( SdfPath const &  id) const

Return the material tag for the given rprim.

HD_API HdRenderDelegate* GetRenderDelegate ( ) const

Currently, a render index only supports connection to one type of render delegate, due to the inserted information and change tracking being specific to that delegate type.

HD_API TfToken GetRenderTag ( SdfPath const &  id) const

Returns the render tag for the given rprim.

HD_API HdResourceRegistrySharedPtr GetResourceRegistry ( ) const

Returns a shared ptr to the resource registry of the current render delegate.

HD_API HdRprim const* GetRprim ( SdfPath const &  id) const

Returns the rprim of id.

HD_API const SdfPathVector& GetRprimIds ( )
inline

Returns a sorted list of all Rprims in the render index.

The list is sorted by std::less<SdfPath>

Definition at line 239 of file renderIndex.h.

HD_API SdfPath GetRprimPathFromPrimId ( int  primId) const

Given a prim id, returns the path of the corresponding rprim or an empty path if none is found.

HD_API SdfPathVector GetRprimSubtree ( SdfPath const &  root)

Returns the subtree rooted under the given path.

HD_API bool GetSceneDelegateAndInstancerIds ( SdfPath const &  id,
SdfPath sceneDelegateId,
SdfPath instancerId 
) const

Query function to return the id's of the scene delegate and instancer associated with the Rprim at the given path.

HD_API HdSceneDelegate* GetSceneDelegateForRprim ( SdfPath const &  id) const

Returns the scene delegate for the given rprim.

HD_API SdfPathVector GetSprimSubtree ( TfToken const &  typeId,
SdfPath const &  root 
)

Returns the subtree rooted under the given path for the given sprim type.

HD_API HdTaskSharedPtr const& GetTask ( SdfPath const &  id) const

Returns the task for the given id.

HD_API HdResourceRegistry::TextureKey GetTextureKey ( HdTextureResource::ID  id) const

Helper utility to convert texture resource id's which are unique to this render index, into a globally unique texture key.

bool HasInstancer ( SdfPath const &  id)
inline

Returns true if instancer id exists in index.

Definition at line 262 of file renderIndex.h.

bool HasRprim ( SdfPath const &  id)
inline

Returns true if rprim id exists in index.

Definition at line 209 of file renderIndex.h.

bool HasTask ( SdfPath const &  id)
inline

Returns true if a task exists in the index with the given id.

Definition at line 283 of file renderIndex.h.

HD_API void InsertBprim ( TfToken const &  typeId,
HdSceneDelegate delegate,
SdfPath const &  bprimId 
)

Insert a bprim into index.

HD_API void InsertInstancer ( HdSceneDelegate delegate,
SdfPath const &  id,
SdfPath const &  parentId = SdfPath() 
)

Insert an instancer into index.

HD_API void InsertRprim ( TfToken const &  typeId,
HdSceneDelegate sceneDelegate,
SdfPath const &  rprimId,
SdfPath const &  instancerId = SdfPath() 
)

Insert a rprim into index.

HD_API void InsertSprim ( TfToken const &  typeId,
HdSceneDelegate delegate,
SdfPath const &  sprimId 
)

Insert a sprim into index.

void InsertTask ( HdSceneDelegate delegate,
SdfPath const &  id 
)

Inserts a new task into the render index with an identifier of id.

Definition at line 493 of file renderIndex.h.

HD_API bool IsBprimTypeSupported ( TfToken const &  typeId) const

Returns whether the bprim type is supported by this render index.

HD_API bool IsRprimTypeSupported ( TfToken const &  typeId) const

Returns whether the rprim type is supported by this render index.

HD_API bool IsSprimTypeSupported ( TfToken const &  typeId) const

Returns whether the sprim type is supported by this render index.

static HD_API HdRenderIndex* New ( HdRenderDelegate *  renderDelegate)
static

Create a render index with the given render delegate.

Returns null if renderDelegate is null.

HD_API void RemoveInstancer ( SdfPath const &  id)

Remove an instancer from index.

HD_API void RemoveRprim ( SdfPath const &  id)

Remove a rprim from index.

HD_API void RemoveSubtree ( const SdfPath root,
HdSceneDelegate sceneDelegate 
)

Clear all entries in the render index under the given root and belong to a specified delegate.

Used for example to unload a delegate.

HD_API void RemoveTask ( SdfPath const &  id)

Removes the given task from the RenderIndex.

HD_API void Sync ( HdDirtyListSharedPtr const &  dirtyList,
HdRprimCollection const &  collection 
)

Adds the dirty list to the sync queue.

The actual processing of the dirty list happens later in SyncAll().

This is typically called from HdRenderPass::Sync. However, the current call chain ties it to SyncAll, i.e. HdRenderIndex::SyncAll > .... > HdRenderPass::Sync > HdRenderIndex::Sync

HD_API void SyncAll ( HdTaskSharedPtrVector *  tasks,
HdTaskContext *  taskContext 
)

Syncs input tasks, B & S prims, (external) computations and processes all pending dirty lists (which syncs the R prims).

At the end of this step, all the resources that need to be updated have handles to their data sources. This is the first phase in Hydra's execution. See HdEngine::Execute


The documentation for this class was generated from the following file: