Clarify that LightmapGI is not supported in compatibility renderer

[vaartis]

The documentation currently does not mention that LightmapGI rendering is not supported in the compatibility renderer. It only states the fact that baking it is not supported (thus it is possible to make an assumption that rendering it is supported, while baking isn't).

I'd originally wanted to reply in #75726 (comment) but appening this to documentation seemed fairly easy to do myself.

[Mickeon]

Good to know, to not waste the developer's time testing

[dsnopek]

LightmapGI rendering does work with the compatibility renderer - this was added in PR #85120

EDIT: Although, I guess that is only 4.3+, which, of course, isn't released yet. If we're only targeting the docs for 4.2 and below, then it's true that it isn't supported in those versions.

[DarioSamo]

LightmapGI rendering does work with the compatibility renderer - this was added in PR #85120

EDIT: Although, I guess that is only 4.3+, which, of course, isn't released yet. If we're only targeting the docs for 4.2 and below, then it's true that it isn't supported in those versions.

And baking also works since 4.3+ too, the host system just needs to be able to run Vulkan at the moment even if you are in Compatibility mode. I feel the documentation should reflect the current state of the feature.

EDIT: In that case it doesn't seem like a documentation change would be necessary? The original version reflects how it currently works after all.

[Mickeon]

Pretend I retracted my approval until I figure how to do so. The documentation should be changed accordingly.

Unless this PR is allowed to _specifically target 4.2 but that would be a major, major exception.

[DarioSamo]

Yeah upon looking at the history, this would seem to overwrite what efb1cba does, which is Clay adding specifically that the feature currently works if you can run a Vulkan renderer even while in compatibility mode. Since #87340 has been merged that statement should be true.

[Mickeon]

See above (yippie).

[vaartis]

It would still be nice if this was at least in 4.2.2, if possible. Which I think is still yet to have a release and will not have LightmapGI.

[Calinou]

It would still be nice if this was at least in 4.2.2, if possible. Which I think is still yet to have a release and will not have LightmapGI.

In this case, you need to open a PR against the 4.2 branch as the statement will only be true for 4.2.x, not 4.3.