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docs/api/rhi/capabilities/capabilities.md
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docs/api/rhi/capabilities/capabilities.md
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# RHICapabilities
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**命名空间**: `XCEngine::RHI`
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**类型**: `struct`
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**描述**: GPU 设备能力结构体,描述了当前图形设备支持的各种功能和限制。
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## 公共成员
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### 特性支持
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| 成员 | 类型 | 描述 |
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|------|------|------|
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| `bSupportsRayTracing` | `bool` | 支持光线追踪 |
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| `bSupportsMeshShaders` | `bool` | 支持 Mesh 着色器 |
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| `bSupportsExplicitMultiThreading` | `bool` | 支持显式多线程 |
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| `bSupportsGeometryShaders` | `bool` | 支持几何着色器 |
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| `bSupportsTessellation` | `bool` | 支持曲面细分 |
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| `bSupportsComputeShaders` | `bool` | 支持计算着色器 |
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| `bSupportsDepthBoundsTest` | `bool` | 支持深度范围测试 |
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| `bSupportsAlphaToCoverage` | `bool` | 支持 Alpha 到覆盖 |
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| `bSupportsIndependentBlend` | `bool` | 支持独立混合 |
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| `bSupportsLogicOps` | `bool` | 支持逻辑操作 |
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| `bSupportsMultiViewport` | `bool` | 支持多视口 |
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| `bSupportsConservativeRasterization` | `bool` | 支持保守光栅化 |
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| `bSupportsProgrammableSamplePositions` | `bool` | 支持可编程采样位置 |
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### 资源限制
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| 成员 | 类型 | 描述 |
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|------|------|------|
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| `maxTexture2DSize` | `uint32_t` | 最大 2D 纹理尺寸 |
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| `maxTexture3DSize` | `uint32_t` | 最大 3D 纹理尺寸 |
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| `maxTextureCubeSize` | `uint32_t` | 最大立方体贴图尺寸 |
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| `maxRenderTargets` | `uint32_t` | 最大渲染目标数量 |
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| `maxViewports` | `uint32_t` | 最大视口数量 |
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| `maxVertexAttribs` | `uint32_t` | 最大顶点属性数量 |
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| `maxConstantBufferSize` | `uint32_t` | 最大常量缓冲大小 |
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| `maxAnisotropy` | `uint32_t` | 最大各向异性级别 |
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| `maxColorAttachments` | `uint32_t` | 最大颜色附件数量 |
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### 线宽和点大小
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| 成员 | 类型 | 描述 |
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|------|------|------|
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| `minSmoothedLineWidth` | `float` | 最小平滑线宽 |
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| `maxSmoothedLineWidth` | `float` | 最大平滑线宽 |
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| `minPointSize` | `float` | 最小点大小 |
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| `maxPointSize` | `float` | 最大点大小 |
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| `maxPointSizeAA` | `float` | 抗锯齿最大点大小 |
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| `maxLineWidth` | `float` | 最大线宽 |
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| `maxLineWidthAA` | `float` | 抗锯齿最大线宽 |
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### 版本信息
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| 成员 | 类型 | 描述 |
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|------|------|------|
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| `majorVersion` | `int` | 主版本号 |
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| `minorVersion` | `int` | 次版本号 |
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| `shaderModel` | `std::string` | 着色器模型版本 |
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## 使用示例
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```cpp
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const RHICapabilities& caps = device->GetCapabilities();
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if (caps.bSupportsRayTracing) {
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// 启用光线追踪功能
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}
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if (caps.bSupportsComputeShaders) {
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// 启用计算着色器
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}
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uint32_t textureSize = std::min(requestedSize, caps.maxTexture2DSize);
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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) - 设备对象
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