map

Motivation

I often use this pattern for GeoJSON sources:

1. addSource('mysource', { type: 'geojson', data: { type:'FeatureCollection', features: [] }});
2. addLayer({ id: 'mylayer', source: 'mysource' })
3. Now fetch the actual data, manipulate it, and call setData() to set it.

I do this because:

• I need to fetch the data asynchronously (but I don't want to hold up all my other i

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If the issue concerns an operator that grab geodata from an external web service (Basemaps, OSM, SRTM), then it can be a network

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

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