Named Lights' Lightmap Pages Doesn't Load (Data Is Read But Not Used)

[Fronkln]

Alright, before posting this issue i 100% checked this out.
In Source, named lights have their own lightmap pages(when a light entity gets turned off, its page is also turned off, that's why)

So i made a test map.

In the map, there are three lights, light 1 and 2 are named lights so they have their own lightmap page.
Light 3 is a unnamed light.

Loading the map in Source to Unity provides us with only the unnamed light loaded.

Unity Source Tools reports the lightmap pages as 1.

BSP Version: 20 (Source SDK 2013)
usrc_lightmappages.zip

Now here is the most important part. Removing one of the named lights from the BSP reduces lightmap lump which Unity Source tools accurately reports. But it doesn't seem to do anything with the lumps of named lights.

[Fronkln]

Update: Apparently the lightmap data is read but unused

[Fronkln]

On a BSP face, there is a thing called styles, this is a byte array of 4. Which is the maximum amount of lights that can affect a face. I'm assuming the styles are not loaded?

[Fronkln]

This could be what we need

[Fronkln]

255 = empty lightmap style

[antim0118]

As I can know, you need to skip lightmap samples for default lightstyle, next is gonna be second lightstyle.
https://developer.valvesoftware.com/wiki/Source_BSP_File_Format#Lighting

[Fronkln]

@antim0118 would we be reading them like how we read normal lightmaps?

[antim0118]

I think, yes

[Fronkln]

We need to find a way to calculate surf size then, if it's already calculated somewhere in the code @lewa-j please let me know.

[lewa-j]

Yes. bspface.LightmapTextureSizeInLuxels

[Fronkln]

I didn't know that was the surf size the code talks about, thank you.

[Fronkln]

If i am not mistaken, lightofs is divided by 4 in Unity Source tools intentionally to load the default style?

[Fronkln]

I came up with the following code. but its not completely working. Style 4(default) on each face is completely fine.
I very likely calculated the offset wrong

If anyone wants to take a look at my experimental code lemme know

updated test map:
usrc_lightmappages_upd.zip

[Fronkln]

I found out the issue, doing further testing

[Fronkln]

I wrote a loop to test things further:

Output:

I think we are pretty close to solving this one. We need to combine this with Unity Source Tool's loop to extract all styles from the face. Also ignore the fact that i called them lightmap page in logging it's just the styles