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XCEngine/docs/api/rhi/command-list/draw.md

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# RHICommandList::Draw
```cpp
virtual void Draw(uint32_t vertexCount, uint32_t instanceCount = 1, uint32_t startVertex = 0, uint32_t startInstance = 0) = 0;
```
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执行非索引绘制调用。从顶点缓冲区按顺序读取顶点数据绘制图元。
**参数:**
- `vertexCount` - 顶点数量
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- `instanceCount` - 实例数量(默认 1
- `startVertex` - 起始顶点偏移(默认 0
- `startInstance` - 起始实例偏移(默认 0
**返回:** `void`
**异常:** 无
**线程安全:** ❌
**复杂度:** O(vertexCount * instanceCount)
**示例:**
```cpp
cmdList->Draw(36); // 绘制36个顶点
```
## 相关文档
- [RHICommandList 总览](command-list.md) - 返回类总览
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- [DrawIndexed](draw-indexed.md) - 索引绘制
- [SetVertexBuffer](set-vertex-buffer.md) - 设置顶点缓冲