The MBF21 standard has introduced three Boom linedef specials to scroll tagged wall textures according to trigger linedef's XY offsets (numbered 1024, 1025, 1026). This is an extension of the Boom special which only scrolls statically the trigger linedef's texture, without tag support. What makes these specials stand out is that there's also support for displacement and accelerative scrolling. Looking at the most likely UDMF candidate in ZDoom, Scroll_Texture_Both
, it doesn't support more than the static type. The other candidate, Scroll_Texture_Model
, only implements the linedef vector model. Scroll_Wall
also doesn't seem to have "accel" or "disp" support, not even in its "flags" parameter, according to doc.
I'm adding Eternity support for the MBF21 specials 1024, 1025 and 1026 and I'd like to have an equivalent UDMF parameterized special for it. Did you define any special for it, or can I add a new one and share its definition with you?