https://github.com/fragglet/htic4doom

Heretic -> Doom compatibility shim
https://github.com/fragglet/htic4doom

Last synced: 9 months ago
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Heretic -> Doom compatibility shim

• Host: GitHub
• URL: https://github.com/fragglet/htic4doom
• Owner: fragglet
• Created: 2019-10-12T17:15:42.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-10-12T20:27:06.000Z (over 6 years ago)
• Last Synced: 2025-04-12T09:00:05.301Z (9 months ago)
• Language: Python
• Homepage: https://www.doomworld.com/forum/topic/109782-heretic-4-doom/
• Size: 292 KB
• Stars: 5
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
Heretic in many ways a reskin of Doom. Many technical details are

(almost) identical between the two games, including level format,

linedef and sector types. With this in mind, this project is a hack to

see if Heretic levels can be made loadable and playable with `doom.wad`.

![Apostate E3M1 - Heretic](sshots/apostate-e3m1-heretic.png) ![Apostate E3M1 - Doom](sshots/apostate-e3m1-doom.png)

The main components are:

* Dehacked patch that maps all Heretic thing types into equivalent thing

  types found in Doom.

* Replacement `TEXTURE1`/`TEXTURE2` lumps. These aim to recreate

  compatible versions of Heretic's wall textures using Doom's texture

  patches. Ideally, for the sake of minimalism no new patches should

  be included unless it proves absolutely necessary.

* Compatibly-named replacements for Heretic's flats (floor and ceiling

  textures). For the sake of consistency, we reuse textures from Doom.

  The distributed WAD will include the version from Freedoom.

* `ANIMATED` and `SWITCHES` lump, so that Heretic's switches and

  animated textures will animate as intended in Boom-compatible source

  ports.

### Limitations

The WAD has a number of limitations in practice:

* It won't work if another PWAD is loaded that contains its own

  `TEXTURE1`/`TEXTURE2` lumps, since the Heretic patches will be missing

  from the WAD directory.

* Because of some buggy code in `P_LoadThings()`, levels will fail to

  load with vanilla (or Chocolate) Doom. Usually it's possible to walk

  around the level but many monsters and items will be missing.

  This is caused by a clash between Heretic thing types and Doom II

  monster types. Levels will load fine if there are none of the

  following present: Golem; Undead Warrior; Golem Ghost; Undead Warrior

  Ghost; Gargoyle; Ring of Invulnerability. Unfortunately this includes

  some of the most common Heretic monsters.

* Heretic levels in practice can end up looking very ugly and

  repetitive. This is because Heretic itself has a very small set of

  textures, the replacements (constructed from Doom textures) can end up

  looking mismatched or inappropriate, and texture alignment inevitably

  ends up being messed up.

* Not all Heretic powerups map to Doom ones in any obvious way. In

  particular if levels rely on using the Wings of Wrath to make progress

  then they probably aren't completable.

* Sometimes line triggers don't work as intended. Heretic has a few

  linedef types which don't match Doom. These include the fast stair

  builder types (106/107), triple-speed door (100) and secret exit

  (105). This can sometimes make levels uncompletable or necessitate

  the use of cheats to finish them.

* Heretic has additional sector types which control friction, scrolling

  and wind effects. Doom doesn't support these and vanilla will crash if

  you walk into a sector of one of these types.