Update MapLibre GL JS Shaders after the TypeScript Migration

[wipfli]

MapLibre GL Native is using the shaders from MapLibre GL JS before the TypeScript migration. I am worried about changing the shaders in GL JS if we cannot test the consequences in native.

@birkskyum created a branch to use the shaders after the TypeScript migration: https://github.com/maplibre/maplibre-gl-native/tree/generate-shaders-using-typescript

Since we forked GL JS, there have been only a hand full of updates to the shaders, see https://github.com/maplibre/maplibre-gl-js/commits/main/src/shaders for a complete list. Notable changes were:

• Migrate to typescript maplibre-gl-js#209
• Bugfix/fix pattern maplibre-gl-js#416
• Shader and typings restructuring maplibre-gl-js#928
• Terrain 3D maplibre-gl-js#1022

[wipfli]

@louwers should this be closed?

[louwers]

@wipfli Yes we have copied them over and they are being refactored to take advantage of OpenGL ES 3.0.

I think WebGL 2 has some of the same functionality of OpenGL ES 3.0, but GL JS does not use WebGL 2 yet. In any case, keeping them in sync will need to happen manually going forward.

[birkskyum]

@louwers , GL JS could very soon allow for some webgl2 though, so I have a hope that we might be able to copy some of these great changes to the shaders back to GL JS when it's ready.

maplibre/maplibre-gl-js#2497
maplibre/maplibre-gl-js#1891