CustomLayer with globe projection seems wrong

[huanglii]

mapbox-gl-js version: 2.13.0

browser:

Steps to Trigger Behavior

1. In the example of Add a custom style layer, change the projection to globe

Link to Demonstration

https://codesandbox.io/s/custom-layer-globe-v4iv2p?file=/index.html

Expected Behavior

Actual Behavior

[saschahofmann]

The docs seem pretty clear about this: Only the mercator projection is supported for custom layers. What I am wondering is whether there are plans to change that and what we could do to support that effort?

[sakitam-fdd]

This seems to be solved by rendering to RTT, but there are certain limitations. I have a toy here, please check it out https://codepen.io/sakitam-fdd/full/jOdgGve

[saschahofmann]

Do I understand this right that you had to define the projection yourself?

[sakitam-fdd]

I don't think it's entirely true. This only benefits the rendering process of ImageSource _setupProxiedCoordsForImageSource, treating the custom layer as a raster layer, so it has significant limitations