docs: update resources API docs
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docs/api/resources/texture/getmiplevels.md
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# Texture::GetMipLevels
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```cpp
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Core::uint32 GetMipLevels() const
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```
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获取 Mipmap 级别数。Mipmap 是纹理的多级渐远表示,用于在不同距离时提供合适的细节级别。
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**参数:** 无
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**返回:** Mipmap 级别数
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**线程安全:** ✅
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**示例:**
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```cpp
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Texture tex;
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tex.Create(1024, 1024, 1, 1,
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TextureType::Texture2D,
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TextureFormat::RGBA8_UNORM,
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nullptr, 0);
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Core::uint32 mips = tex.GetMipLevels(); // 返回 1
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tex.GenerateMipmaps(); // 如果实现生成多级 mipmap
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Core::uint32 mipsAfter = tex.GetMipLevels(); // 可能返回 > 1
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```
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## 相关文档
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- [Texture 总览](texture.md) - 返回类总览
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- [GenerateMipmaps](generatemipmaps.md) - 生成 Mipmap 链
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