primTypeIndex.h

//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_IMAGING_HD_PRIM_TYPE_INDEX_H
#define PXR_IMAGING_HD_PRIM_TYPE_INDEX_H

#include "pxr/pxr.h"
#include "pxr/imaging/hd/types.h"
#include "pxr/imaging/hd/sortedIds.h"
#include "pxr/base/tf/token.h"
#include "pxr/usd/sdf/path.h"

#include <set>
#include <vector>
#include <unordered_map>

PXR_NAMESPACE_OPEN_SCOPE

class HdChangeTracker;
class HdRenderDelegate;
class HdRenderParam;
class HdSceneDelegate;
class SdfPath;
using HdSceneDelegatePtrVector = std::vector<HdSceneDelegate*>;

template <class PrimType>
class Hd_PrimTypeIndex {
public:
    Hd_PrimTypeIndex();
    ~Hd_PrimTypeIndex();

    void InitPrimTypes(const TfTokenVector &primTypes);

    void Clear(HdChangeTracker &tracker, HdRenderDelegate *renderDelegate);

    void InsertPrim(const TfToken &typeId,
                    HdSceneDelegate *sceneDelegate,
                    const SdfPath &primId,
                    HdChangeTracker &tracker,
                    HdRenderDelegate *renderDelegate);

    void RemovePrim(const TfToken &typeId,
                    const SdfPath &primId,
                    HdChangeTracker &tracker,
                    HdRenderDelegate *renderDelegate);

    void RemoveSubtree(const SdfPath &root,
                       HdSceneDelegate* sceneDelegate,
                       HdChangeTracker &tracker,
                       HdRenderDelegate *renderDelegate);

    PrimType *GetPrim(const TfToken &typeId,
                      const SdfPath &primId) const;

    PrimType *GetFallbackPrim(TfToken const &typeId) const;

    void GetPrimSubtree(const TfToken &typeId,
                        const SdfPath &rootPath,
                        SdfPathVector *outPaths);

    bool CreateFallbackPrims(HdRenderDelegate *renderDelegate);

    void DestroyFallbackPrims(HdRenderDelegate *renderDelegate);

    void SyncPrims(HdChangeTracker &tracker,
                   HdRenderParam *renderParam);
    
   const HdSceneDelegatePtrVector& GetSceneDelegatesForDirtyPrims();

private:
    struct _PrimInfo {
        HdSceneDelegate *sceneDelegate;
        PrimType        *prim;
    };

    typedef std::unordered_map<SdfPath, _PrimInfo, SdfPath::Hash> _PrimMap;

    struct _PrimTypeEntry
   {
        _PrimMap         primMap;
        Hd_SortedIds     primIds;   // Primarily for sub-tree searching
        PrimType        *fallbackPrim;

        _PrimTypeEntry()
         : primMap()
         , primIds()
         , fallbackPrim(nullptr)
        {
        }
    };

    typedef std::unordered_map<TfToken, size_t, TfToken::HashFunctor> _TypeIndex;

    typedef std::vector<_PrimTypeEntry> _PrimTypeList;

    _PrimTypeList _entries;
    _TypeIndex    _index;
    HdSceneDelegatePtrVector _dirtyPrimDelegates;


    // Template methods that are expected to be specialized on PrimType.
    // These are to handle prim type specific function names on called objects.
    static void _TrackerInsertPrim(HdChangeTracker &tracker,
                                   const SdfPath &path,
                                   HdDirtyBits initialDirtyState);

    static void _TrackerRemovePrim(HdChangeTracker &tracker,
                                   const SdfPath &path);

    static HdDirtyBits _TrackerGetPrimDirtyBits(HdChangeTracker &tracker,
                                                const SdfPath &path);

    static void _TrackerMarkPrimClean(HdChangeTracker &tracker,
                                      const SdfPath &path,
                                      HdDirtyBits dirtyBits);

    static PrimType *_RenderDelegateCreatePrim(HdRenderDelegate *renderDelegate,
                                               const TfToken &typeId,
                                               const SdfPath &primId);
    static PrimType *_RenderDelegateCreateFallbackPrim(
            HdRenderDelegate *renderDelegate,
            const TfToken &typeId);

    static void _RenderDelegateDestroyPrim(HdRenderDelegate *renderDelegate,
                                           PrimType *prim);

    // No copying
    Hd_PrimTypeIndex(const Hd_PrimTypeIndex &) = delete;
    Hd_PrimTypeIndex &operator =(const Hd_PrimTypeIndex &) = delete;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_IMAGING_HD_PRIM_TYPE_INDEX_H