textureHandleRegistry.h

//
// Copyright 2020 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_TEXTURE_HANDLE_REGISTRY_H
#define PXR_IMAGING_HD_ST_TEXTURE_HANDLE_REGISTRY_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
 
#include "pxr/imaging/hdSt/textureObject.h"
 
#include "pxr/imaging/hd/enums.h"
 
#include <tbb/concurrent_vector.h>
 
#include <set>
#include <memory>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdStResourceRegistry;
class HdStTextureIdentifier;
class HdSamplerParameters;
class HdSt_SamplerObjectRegistry;
 
using HdStTextureHandlePtr =
    std::weak_ptr<class HdStTextureHandle>;
using HdStTextureHandleSharedPtr =
    std::shared_ptr<class HdStTextureHandle>;
using HdStTextureObjectPtr =
    std::weak_ptr<class HdStTextureObject>;
using HdStTextureObjectSharedPtr =
    std::shared_ptr<class HdStTextureObject>;
using HdStSamplerObjectSharedPtr =
    std::shared_ptr<class HdStSamplerObject>;
using HdStShaderCodePtr =
    std::weak_ptr<class HdStShaderCode>;
using HdStShaderCodeSharedPtr =
    std::shared_ptr<class HdStShaderCode>;
 
class HdSt_TextureHandleRegistry final
{
public:
    HDST_API
    explicit HdSt_TextureHandleRegistry(HdStResourceRegistry * registry);
 
    HDST_API
    ~HdSt_TextureHandleRegistry();
 
    HDST_API
    HdStTextureHandleSharedPtr AllocateTextureHandle(
        const HdStTextureIdentifier &textureId,
        HdStTextureType textureType,
        const HdSamplerParameters &samplerParams,
        size_t memoryRequest,
        HdStShaderCodePtr const &shaderCode);
 
    HDST_API
    void MarkDirty(HdStTextureObjectPtr const &texture);
 
    HDST_API
    void MarkDirty(HdStShaderCodePtr const &shader);
 
    HDST_API
    void MarkSamplerGarbageCollectionNeeded();
 
    HdSt_TextureObjectRegistry * GetTextureObjectRegistry() const {
        return _textureObjectRegistry.get();
    }
 
    HdSt_SamplerObjectRegistry * GetSamplerObjectRegistry() const {
        return _samplerObjectRegistry.get();
    }
 
    HDST_API
    std::set<HdStShaderCodeSharedPtr> Commit();
 
    HDST_API
    void SetMemoryRequestForTextureType(HdStTextureType textureType, size_t memoryRequest);
 
    HDST_API
    size_t GetNumberOfTextureHandles() const;
 
private:
    void _ComputeMemoryRequest(HdStTextureObjectSharedPtr const &);
    void _ComputeMemoryRequests(const std::set<HdStTextureObjectSharedPtr> &);
    void _ComputeAllMemoryRequests();
 
    bool _GarbageCollectHandlesAndComputeTargetMemory();
    void _GarbageCollectAndComputeTargetMemory();
    std::set<HdStShaderCodeSharedPtr> _Commit();
 
    class _TextureToHandlesMap;
 
    // Maps texture type to memory a single texture of that type can consume
    // (in bytes).
    // Will be taken into account when computing the maximum of all the
    // memory requests of the texture handles.
    std::map<HdStTextureType, size_t> _textureTypeToMemoryRequest;
    // Has _textureTypeToMemoryRequest changed since the last commit.
    bool _textureTypeToMemoryRequestChanged;
 
    // Handles that are new or for which the underlying texture has
    // changed: samplers might need to be (re-)allocated and the
    // corresponding shader code might need to update the shader bar.
    tbb::concurrent_vector<HdStTextureHandlePtr> _dirtyHandles;
 
    // Textures whose set of associated handles and target memory
    // might have changed.
    tbb::concurrent_vector<HdStTextureObjectPtr> _dirtyTextures;
 
    // Shaders that dropped a texture handle also need to be notified
    // (for example because they re-allocated the shader bar after dropping
    // the texture).
    tbb::concurrent_vector<HdStShaderCodePtr> _dirtyShaders;
 
    std::unique_ptr<class HdSt_SamplerObjectRegistry> _samplerObjectRegistry;
    std::unique_ptr<class HdSt_TextureObjectRegistry> _textureObjectRegistry;
    std::unique_ptr<_TextureToHandlesMap> _textureToHandlesMap;
 
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif