This is an experimental (and somewhat hacky) implementation of a globe view with tilt.

Since it's achieved through post-processing, there are some limitations, including:

• Limited drawn area on the screen (due to extent mismatch).
• No support for rotation (yet).
• No support for extrusion.
• Only works on WebGL layers, and a canvas vector layer (so far).

It introduces concepts such as:

• Subjective projection: Projected coordinates depend on the current view (typically the center).
• Final projection: Lifts the restriction of affine transform when converting intermediate (flat) coordinates to pixel coordinates.

And, some notes:

• Had to use double-float arithmetic in GLSL for better precision at z > 18.
• Built on top of Refactor WebGL Post-processing #16165.

It's still in progress, and any feedbacks are welcome!

Thank you.