Expose copy_effects compute shader in Mobile backend

[Lasuch69]

This PR exposes compute version (the only one currently) of copy effects allowing for using some of the RenderingServer's functions on Mobile backend eg. sky_bake_to_panorama.

Baking Lightmaps on development machine works (not considering other bugs).

Note: I encourage to test it on your phone. This is a quick change/hack, feedback necessary.

Fixes: #55868

[Lasuch69]

I forgot about other checks too.

Edit: deleted them now.

[Lasuch69]

I can take a look at what functions (without raster version) can be exposed if not all of them need to be exposed.

Edit: At a first glance removing more checks was unnecessary, at least by looking at functions in the rendering server.

[Lasuch69]

The way I see it is that only copy_cubemap_to_panorama would be of any use. Should I leave other 2 functions as is (with a check that is)?

Note: I haven't tested it on a phone yet, I need to build android template.

[clayjohn]

The way I see it is that only copy_cubemap_to_panorama would be of any use. Should I leave other 2 functions as is (with a check that is)?

Note: I haven't tested it on a phone yet, I need to build android template.

No need to add the checks back. They were there to ensure we didn't accidentally try to run a shader that wasn't compiled. Since we are now initializing those shaders anyway, we don't need the checks and its better not to have them

[clayjohn]

Looks good to me!

Tested locally to confirm that it works in the test project

[Calinou]

Note: I haven't tested it on a phone yet, I need to build android template.

The lightmapper_rd module isn't built on Android, so it won't work there either way.

[Lasuch69]

That's true however you can try to use copy_cubemap_to_panorama via RenderingServer.

[YuriSizov]

Thanks!

[YuriSizov]

Cherry-picked for 4.2.2.