WebGL2 异步读取纹理数据速度很慢
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bug
- Dominant language
- TypeScript
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Description
目前异步 readTexture 方法使用了 `gl.fenceSync`，按说是比较推荐的非阻塞做法（Babylon.js 也使用了该做法），但在 L7 中实测相比同步方法要慢很多。
https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/WebGL_best_practices#use_non-blocking_async_data_readback
https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Engines/engine.ts#L1016C12-L1016C28
https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Engines/Extensions/engine.readTexture.ts#L179
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