textureObjectRegistry.h

//
// Copyright 2020 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_ST_TEXTURE_OBJECT_REGISTRY_H
#define PXR_IMAGING_HD_ST_TEXTURE_OBJECT_REGISTRY_H

#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hd/enums.h"
#include "pxr/imaging/hd/instanceRegistry.h"

#include <tbb/concurrent_vector.h>
#include <vector>
#include <atomic>

PXR_NAMESPACE_OPEN_SCOPE

using HdStTextureObjectSharedPtr =
    std::shared_ptr<class HdStTextureObject>;
using HdStTextureObjectPtr =
    std::weak_ptr<class HdStTextureObject>;
using HdStTextureObjectPtrVector =
    std::vector<HdStTextureObjectPtr>;
class HdStResourceRegistry;
class HdStTextureIdentifier;


class HdSt_TextureObjectRegistry final
{
public:
    explicit HdSt_TextureObjectRegistry(HdStResourceRegistry * registry);
    ~HdSt_TextureObjectRegistry();

    HDST_API
    HdStTextureObjectSharedPtr AllocateTextureObject(
        const HdStTextureIdentifier &textureId,
        HdTextureType textureType);

    HDST_API
    std::set<HdStTextureObjectSharedPtr> Commit();

    HDST_API
    void GarbageCollect();

    HDST_API
    void MarkTextureFilePathDirty(const TfToken &filePath);

    HDST_API
    void MarkTextureObjectDirty(
        HdStTextureObjectPtr const &textureObject);

    HDST_API
    HdStResourceRegistry * GetResourceRegistry() const {
        return _resourceRegistry;
    }

    int64_t GetTotalTextureMemory() const {
        return _totalTextureMemory;
    }

    HDST_API
    void AdjustTotalTextureMemory(int64_t memDiff);

    size_t GetNumberOfTextureObjects() const {
        return _textureObjectRegistry.size();
    }

private:
    HdStTextureObjectSharedPtr _MakeTextureObject(
        const HdStTextureIdentifier &textureId,
        HdTextureType textureType);

    std::atomic<int64_t> _totalTextureMemory;

    // Registry for texture and sampler objects.
    HdInstanceRegistry<HdStTextureObjectSharedPtr>
        _textureObjectRegistry;

    // Map file paths to texture objects for quick invalidation
    // by file path.
    std::unordered_map<TfToken, HdStTextureObjectPtrVector,
                       TfToken::HashFunctor>
        _filePathToTextureObjects;

    // File paths for which GPU resources need to be (re-)loaded
    tbb::concurrent_vector<TfToken> _dirtyFilePaths;

    // Texture for which GPU resources need to be (re-)loaded
    tbb::concurrent_vector<HdStTextureObjectPtr> _dirtyTextures;

    HdStResourceRegistry *_resourceRegistry;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif