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Vulkan extension 架构 1. 架构 - VulkanExtensionRegistry.cpp：维护所有 extension 描述表，是唯一登记入口。 - VulkanExtension.cpp：读取描述表，生成 instance/device extension 列表。 - VulkanExtensionFactories.cpp：放复杂 extension 的具体实现。 - 简单 extension 只写在 Registry 里；复杂 extension 再额外走 Factory。 2. 添加 extension - 先判断它是 Instance 还是 Device，是 required 还是 optional。 - 如果是简单 extension：直接在 VulkanExtensionRegistry.cpp 加一条 descriptor。 - 如果是复杂 extension： 在 VulkanExtensionFactories.cpp 里实现类和 factory， 然后在 VulkanExtensionRegistry.cpp 里把 descriptor 指到这个 factory。 - 如果它会影响 capability 或 pNext/feature/property，记得在复杂 extension 实现里补齐对应逻辑。
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