Hi guys,

Thank you for this awesome library!

Not sure if it's a bug or just me doing something wrong (probably the latter...), but I am experiencing some weird rendering issues when using the line layer.

At the maximum zoom level the line looks as I would expect it:

However, whe

MGLTilePyramidOfflineRegion should have a countOfTiles method that returns the number of tiles included in the tile pyramid. The implementation would rely on the mbgl::util::tileCount() function added in #9906.

This is the iOS/macOS equivalent to #11108 for Android. It would serve as a built-in alternative to mapbox/turf-swift#47 for applications already using the map SDK, including applica

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maptalks's version and what browser you use?
v0.43.0, chrome

Issue description
Layers do not share WebGL context, which creates glitches when a map has more than one 3d layer. For example a buildings layer with a 3D line will not hide the line behind the buildings.
In particular, I am implementing a 3D terrain layer but this layer will not hide (behind mountains) any other 3d element