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docs/api/rhi/buffer/buffer.md
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docs/api/rhi/buffer/buffer.md
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# RHIBuffer
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**命名空间**: `XCEngine::RHI`
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**类型**: `class` (abstract)
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**描述**: GPU 缓冲区资源抽象接口,用于管理顶点缓冲、索引缓冲、常量缓冲等 GPU 内存资源。
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## 概述
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`RHIBuffer` 封装了 GPU 缓冲区的创建、数据上传、状态管理等操作。支持多种缓冲区类型,包括顶点缓冲、索引缓冲、常量缓冲等。
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## 公共方法
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| 方法 | 描述 |
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|------|------|
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| [`Map`](map.md) | 映射缓冲区到 CPU 可访问内存 |
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| [`Unmap`](unmap.md) | 取消映射 |
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| [`SetData`](set-data.md) | 设置缓冲区数据 |
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| [`GetSize`](get-size.md) | 获取缓冲区大小 |
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| [`GetBufferType`](get-buffer-type.md) | 获取缓冲区类型 |
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| [`SetBufferType`](set-buffer-type.md) | 设置缓冲区类型 |
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| [`GetStride`](get-stride.md) | 获取缓冲区步长 |
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| [`SetStride`](set-stride.md) | 设置缓冲区步长 |
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| [`GetState`](get-state.md) | 获取资源状态 |
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| [`SetState`](set-state.md) | 设置资源状态 |
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| [`Shutdown`](shutdown.md) | 关闭并释放资源 |
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| [`GetNativeHandle`](get-native-handle.md) | 获取原生句柄 |
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| [`GetName`](get-name.md) | 获取资源名称 |
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| [`SetName`](set-name.md) | 设置资源名称 |
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## 缓冲区类型 (BufferType)
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| 枚举值 | 描述 |
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|--------|------|
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| `BufferType::Vertex` | 顶点缓冲 |
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| `BufferType::Index` | 索引缓冲 |
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| `BufferType::Constant` | 常量缓冲 (Constant Buffer) |
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| `BufferType::ReadBack` | 回读缓冲(用于 CPU 读取 GPU 数据) |
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| `BufferType::Indirect` | 间接执行缓冲 |
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| `BufferType::RaytracingAccelerationStructure` | 光线追踪加速结构 |
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| `BufferType::ShaderBindingTable` | 光线追踪着色器绑定表 |
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## 资源状态 (ResourceStates)
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| 状态 | 描述 |
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|------|------|
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| `Common` | 默认状态 |
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| `VertexAndConstantBuffer` | 顶点/常量缓冲 |
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| `IndexBuffer` | 索引缓冲 |
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| `RenderTarget` | 渲染目标 |
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| `UnorderedAccess` | 无序访问 |
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| `DepthWrite` | 深度写入 |
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| `DepthRead` | 深度读取 |
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| `NonPixelShaderResource` | 非像素着色器资源 |
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| `PixelShaderResource` | 像素着色器资源 |
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| `CopySrc` | 复制源 |
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| `CopyDst` | 复制目标 |
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| `Present` | 呈现状态 |
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| `GenericRead` | 通用读取 |
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## 使用示例
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```cpp
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BufferDesc desc;
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desc.size = sizeof(Vertex) * vertexCount;
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desc.stride = sizeof(Vertex);
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desc.bufferType = (uint32_t)BufferType::Vertex;
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desc.flags = 0;
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RHIBuffer* vertexBuffer = device->CreateBuffer(desc);
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void* mapped = vertexBuffer->Map();
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memcpy(mapped, vertexData, desc.size);
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vertexBuffer->Unmap();
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vertexBuffer->SetState(ResourceStates::VertexAndConstantBuffer);
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vertexBuffer->Shutdown();
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```
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## 相关文档
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- [../rhi/rhi.md](../rhi.md) - RHI 模块总览
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- [RHIDevice](../device/device.md) - 创建设备
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- [RHITexture](../texture/texture.md) - 纹理资源
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- [RHICommandList](../command-list/command-list.md) - 命令列表
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docs/api/rhi/buffer/get-buffer-type.md
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docs/api/rhi/buffer/get-buffer-type.md
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# RHIBuffer::GetBufferType
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```cpp
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virtual BufferType GetBufferType() const = 0;
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```
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获取缓冲区类型。
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**返回:** 缓冲区类型枚举值
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/get-name.md
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# RHIBuffer::GetName
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```cpp
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virtual const std::string& GetName() const = 0;
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```
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获取缓冲区名称(用于调试)。
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**返回:** 缓冲区名称
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/get-native-handle.md
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docs/api/rhi/buffer/get-native-handle.md
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# RHIBuffer::GetNativeHandle
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```cpp
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virtual void* GetNativeHandle() = 0;
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```
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获取原生 API 句柄。
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**返回:**
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- D3D12: `ID3D12Resource*`
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- OpenGL: `GLuint` 指针
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/get-size.md
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# RHIBuffer::GetSize
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```cpp
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virtual uint64_t GetSize() const = 0;
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```
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获取缓冲区大小(字节)。
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**返回:** 缓冲区大小
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/get-state.md
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# RHIBuffer::GetState
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```cpp
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virtual ResourceStates GetState() const = 0;
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```
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获取当前资源状态。
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**返回:** 资源状态枚举值
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/get-stride.md
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# RHIBuffer::GetStride
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```cpp
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virtual uint32_t GetStride() const = 0;
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```
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获取单个元素的字节大小。
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**返回:** 元素步长(字节)
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/map.md
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# RHIBuffer::Map
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```cpp
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virtual void* Map() = 0;
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```
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映射缓冲区内存到 CPU 可访问空间。
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**返回:** 指向缓冲区数据的指针
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**复杂度:** O(1)
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**示例:**
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```cpp
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void* data = buffer->Map();
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if (data) {
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memcpy(data, vertexData, bufferSize);
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buffer->Unmap();
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}
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```
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/set-buffer-type.md
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# RHIBuffer::SetBufferType
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```cpp
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virtual void SetBufferType(BufferType type) = 0;
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```
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设置缓冲区类型。
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**参数:**
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- `type` - 新的缓冲区类型
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/set-data.md
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# RHIBuffer::SetData
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```cpp
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virtual void SetData(const void* data, size_t size, size_t offset = 0) = 0;
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```
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设置缓冲区数据。
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**参数:**
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- `data` - 源数据指针
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- `size` - 数据大小(字节)
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- `offset` - 缓冲区内的偏移量
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**复杂度:** O(n)
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**示例:**
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```cpp
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Vertex vertices[] = {
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{0.0f, 0.5f, 0.0f},
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{0.5f, -0.5f, 0.0f},
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{-0.5f, -0.5f, 0.0f}
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};
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buffer->SetData(vertices, sizeof(vertices), 0);
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```
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/set-name.md
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# RHIBuffer::SetName
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```cpp
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virtual void SetName(const std::string& name) = 0;
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```
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设置缓冲区名称(用于调试)。
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**参数:**
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- `name` - 新名称
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**复杂度:** O(1)
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**示例:**
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```cpp
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buffer->SetName("VertexBuffer_Main");
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```
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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# RHIBuffer::SetState
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```cpp
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virtual void SetState(ResourceStates state) = 0;
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```
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设置资源状态。
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**参数:**
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- `state` - 新的资源状态
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**复杂度:** O(1)
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**示例:**
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```cpp
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buffer->SetState(ResourceStates::VertexAndConstantBuffer);
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```
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/set-stride.md
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# RHIBuffer::SetStride
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```cpp
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virtual void SetStride(uint32_t stride) = 0;
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```
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设置元素字节大小。
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**参数:**
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- `stride` - 新的步长值
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/shutdown.md
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# RHIBuffer::Shutdown
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```cpp
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virtual void Shutdown() = 0;
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```
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释放缓冲区资源。
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**复杂度:** O(1)
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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docs/api/rhi/buffer/unmap.md
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# RHIBuffer::Unmap
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```cpp
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virtual void Unmap() = 0;
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```
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取消内存映射。
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**复杂度:** O(1)
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**示例:**
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```cpp
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buffer->Map();
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memcpy(mappedData, sourceData, size);
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buffer->Unmap();
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```
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## 相关文档
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- [RHIBuffer 总览](buffer.md) - 返回类总览
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