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首屏分层加载(先粗后细) #28

Description

@tiye

首次进入约 100 个叶子 × (1 DEM + 1 影像) ≈ 200 请求,6 并发下要数十秒才铺满。

任务

  • 先请求粗 zoom 铺满视野,再逐级补细节
  • 瓦片 mesh 直接写入 MTLBuffer.contents(),避免 Swift 数组中转拷贝
  • mipmap 生成合批/限流,避免后台线程长时间阻塞

Activity

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