ZDoom

[quote="Graf Zahl"]These mods use a palette based map, but those do not work with hardware rendering and deriving a blend color from them is not trivial.[/quote]
I think most real cases can be covered by looking at the whiteindex and blackindex colors.
[list][*]If the blackindex color is lighter than the whiteindex color, it's an inverted ramp.
[*]The lightest color (blackindex if inverted, whiteindex otherwise) gives you the "pure" blend color since it's applied to a white base.[/list]

It's when different color ranges get different blendings that this wouldn't be possible (e.g. a hue change) but I don't remember ever seeing that used. A hue change wouldn't affect black or white (since by definition they have 0% saturation, making them hue irrelevant) but could be detected by looking, for the vanilla Doom palette, at index 176 (pure red) and index 200 (pure blue). So more algorithmically, keeping track of the purest red, green, and blue values in the base palette and looking at if they have an approximately constant hue change in the invuln palette would solve that case, too.

I think the best option is to put it in MAPINFO.

These mods use a palette based map, but those do not work with hardware rendering and deriving a blend color from them is not trivial.

Hello! I'm not sure if this is the right topic to bring this up, but it seems related so I figured I might as well. I've noticed that when the custom option is disabled, GZDoom always defaults to the classic inverted color map for the invulnerability filter regardless of the PWAD being played. I've seen playthroughs of Back to Saturn X and Eviternity in other source ports and know that they were designed with custom filters, the former using an inverted color map with a light blue tint and the latter providing a noninverted green filter. Is this something that the WAD designers would have to do specially to work with GZDoom, or is it an enhancement that would need to be made to GZDoom to recognize those PWAD-defined settings?

First, you need to upgrade to the latest version of GZDoom. I don't even know if LZDoom has this or not, if it does it would be in the latest version of that too.

Then, you will find the option in the menu under Options->Display Options:
[imgur]https://imgur.com/ZXuwB3N[/imgur]

Ok I know that I can seen as an idiot but how to enable this feauture now? In config file i cannot find this CVar. Please help.

Sure. I've been wanting this feature myself since a very long time.

Thanks for this.

Alright, squash-merged as [url=https://github.com/coelckers/gzdoom/commit/a3741abbf359537998f5532f9afcc5d36059c3ed]a3741abbf[/url] then.

No.

Are there any objections with me going ahead with the merge on this one?

Where is the parsing done? Isn't it already being called [url=https://github.com/coelckers/gzdoom/blob/76704e0ae8107afa18bd84701cb817b2286c047e/src/d_main.cpp#L2564]here[/url]?

Only if you call it once with 'false' before parsing.

Will [url=https://github.com/coelckers/gzdoom/pull/972/commits/76704e0ae8107afa18bd84701cb817b2286c047e]this work[/url]?

During parsing of ZScript or DECORATE the first colormap must be the inverse one, even if the option is on.
Otherwise the color matching may fail.