102 lines
4.5 KiB
Markdown
102 lines
4.5 KiB
Markdown
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# ResourceManager
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**命名空间**: `XCEngine::Resources`
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**类型**: `class` (singleton)
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**描述**: 资源管理器单例，负责资源的加载、缓存、引用计数管理和异步加载调度。
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## 概述
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`ResourceManager` 是 XCEngine 资源管理系统的核心单例类。它提供统一的资源加载接口、自动缓存管理、引用计数跟踪和异步加载支持。所有资源访问都应通过 `ResourceManager` 进行。
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## 单例访问
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| 方法 | 描述 |
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|------|------|
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| `static ResourceManager& Get()` | 获取单例实例 |
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## 公共方法
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| 方法 | 描述 |
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|------|------|
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| `void Initialize()` | 初始化资源管理器 |
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| `void Shutdown()` | 关闭资源管理器，卸载所有资源 |
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| `void SetResourceRoot(const Containers::String& rootPath)` | 设置资源根目录 |
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| `const Containers::String& GetResourceRoot() const` | 获取资源根目录 |
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| `ResourceHandle<T> Load(const Containers::String& path, ImportSettings* settings = nullptr)` | 同步加载资源（模板方法） |
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| `void LoadAsync(const Containers::String& path, ResourceType type, std::function<void(LoadResult)> callback)` | 异步加载资源 |
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| `void LoadAsync(const Containers::String& path, ResourceType type, ImportSettings* settings, std::function<void(LoadResult)> callback)` | 带设置的异步加载 |
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| `void LoadGroup(const Containers::Array<Containers::String>& paths, std::function<void(ResourceHandle<T>)> callback)` | 批量异步加载同类资源 |
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| `void Unload(const Containers::String& path)` | 按路径卸载资源 |
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| `void Unload(ResourceGUID guid)` | 按 GUID 卸载资源 |
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| `void UnloadUnused()` | 卸载所有无引用的资源 |
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| `void UnloadAll()` | 卸载所有资源 |
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| `void AddRef(ResourceGUID guid)` | 增加引用计数（内部使用） |
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| `void Release(ResourceGUID guid)` | 减少引用计数（内部使用） |
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| `Core::uint32 GetRefCount(ResourceGUID guid) const` | 获取引用计数 |
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| `IResource* Find(const Containers::String& path)` | 按路径查找资源 |
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| `IResource* Find(ResourceGUID guid)` | 按 GUID 查找资源 |
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| `bool Exists(const Containers::String& path) const` | 检查资源是否存在 |
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| `bool Exists(ResourceGUID guid) const` | 检查 GUID 对应资源是否存在 |
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| `void RegisterLoader(IResourceLoader* loader)` | 注册资源加载器 |
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| `void UnregisterLoader(ResourceType type)` | 注销加载器 |
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| `IResourceLoader* GetLoader(ResourceType type) const` | 获取指定类型的加载器 |
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| `void SetMemoryBudget(size_t bytes)` | 设置内存预算 |
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| `size_t GetMemoryUsage() const` | 获取当前内存使用量 |
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| `size_t GetMemoryBudget() const` | 获取内存预算 |
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| `void FlushCache()` | 清空缓存 |
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| `Containers::String ResolvePath(const Containers::String& relativePath) const` | 将相对路径解析为绝对路径 |
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| `Containers::Array<Containers::String> GetResourcePaths() const` | 获取所有已加载资源的路径列表 |
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| `void UnloadGroup(const Containers::Array<ResourceGUID>& guids)` | 按 GUID 批量卸载 |
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## 实现说明
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```cpp
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// 初始化
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ResourceManager::Get().Initialize();
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ResourceManager::Get().SetResourceRoot("resources/");
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// 注册加载器
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ResourceManager::Get().RegisterLoader(new TextureLoader());
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ResourceManager::Get().RegisterLoader(new MeshLoader());
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ResourceManager::Get().RegisterLoader(new MaterialLoader());
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// 同步加载
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ResourceHandle<Texture> tex = ResourceManager::Get().Load<Texture>("textures/player.png");
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ResourceHandle<Mesh> mesh = ResourceManager::Get().Load<Mesh>("models/player.fbx");
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// 异步加载
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ResourceManager::Get().LoadAsync("textures/terrain.png", ResourceType::Texture,
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[](LoadResult result) {
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if (result.success) {
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ResourceHandle<Texture> tex(result.resource);
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// 使用纹理...
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}
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});
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// 批量加载
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Containers::Array<Containers::String> paths = {"a.png", "b.png", "c.png"};
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ResourceManager::Get().LoadGroup<Texture>(paths,
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[](ResourceHandle<Texture> tex) {
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if (tex.IsValid()) {
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// 处理加载完成的纹理...
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}
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});
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// 设置内存预算
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ResourceManager::Get().SetMemoryBudget(1024 * 1024 * 1024); // 1GB
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// 卸载
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ResourceManager::Get().UnloadUnused();
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ResourceManager::Get().Shutdown();
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```
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## 相关文档
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- [IResource](../iresource/iresource.md) - 资源基类
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- [ResourceHandle](../resourcehandle/resourcehandle.md) - 资源句柄
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- [ResourceCache](../resourcecache/resourcecache.md) - 资源缓存
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- [AsyncLoader](../asyncloader/asyncloader.md) - 异步加载器
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- [Resources 总览](../resources.md) - 返回模块总览
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