If you could add any feature to zdoom...

[Marisa the Magician]

Screen-space pixel shaders.

[Gez]

the MBF press-release emulation mode.

I've got parts of that done. Done better, even: loading the original doombeta IWAD rather than something else, since I've got support for the old texture formats.

All it needs to be functional would be some slight adjustments here and there (such as in the xlat lump) which could be done with a new game mode.

[Enjay]

A number of years ago, I could easily have come up with a long list of things I'd like to see added to Zdoom. However, most of them have now been added in one shape or another and there is very little left that either isn't already being worked on or is really beyond the scope of Zdoom. Anything else, I guess I simply haven't even thought about.

[printz]

Decals on floors and ceilings.

[NeuralStunner]

Decals on floors and ceilings.

You know what, this might be possible in GL (using shaders?). Ever look really close at a dynamic light on the floor?

[Caligari87]

I'm not sure I get what you mean...

[NeuralStunner]

"Dynamic lights" in GZDoom are quite similar to decals. If you look in GZDoom.pk3\GLStuff, you'll find GLLight.png - Though I'm not sure if that's used when lights are handled by shaders.

[Caligari87]

Eeenteresting.... *strokes beard thoughtfully*

[Gez]

No, that file is used by the pre-shader method.

[esselfortium]

Doing floor/ceiling decals in software is possible, but it'd likely be a gigantic pain in the ass to implement. You'd either need to add yet another step in the rendering process to draw them separately, and figure out all the potential clipping issues there, or give every subsector its own flat in memory, and hope all your users have 16 gb of ram.

[NeuralStunner]

I'm curious, why is it not a concern for vertical textures? How are they handled differently from one another?

[edward850]

Because there is already code that is used for multi-part wall textures.

[NeuralStunner]

I realize that. I was hoping for something a little more technical, but not too technical, else it'd go over my head completely.

[Graf Zahl]

No, that file is used by the pre-shader method.

Its use is also quite different from how decals need to be handled. Texture coordinates are merely representing the distance to the light not some special position on the light texture.

[Gez]

Because there is already code that is used for multi-part wall textures.

No. The textures are composited into a single image when the wad is loaded.