GPU Lightmap: Baking directional with physical lights causes static lights to have excessive amount of energy compare with no directional bake

[jcostello]

Godot version

v4.2.rc.custom_build [4c5a14845]

System information

Ubuntu with Nvidia 2060

Issue description

When physical lights are configured in the project and static lights are baked with directional, they receive a lot of energy compared with no directional bake

Direcional:

No directional:

Steps to reproduce

Use MRP

Set ligihts to phyisical in project configuration Bake lightmap with directional

For comparison: Set ligihts to non-phyisical in project configuration Bake lightmap with directional

Minimal reproduction project

lightmap.zip

[Calinou]

My guess is that bake_params.exposure_normalization isn't used where it should be in the directional lightmap baking shader. Here's an example where it's used correctly: https://github.com/godotengine/godot/blob/b3a0e077ebd29bc4e2456dea816b525b691932ab/modules/lightmapper_rd/lm_compute.glsl#L461-L531

[jcostello]

I added * bake_params.exposure_normalization to line 444 but that completelly eliminates direct light.