The map format used by the Reality Engine to implement the Super Nintendo version of Doom is custom and is created by running a converter program on a vanilla Doom map, implemented as a Motorola 68K assembly program for the Amiga system. The primary source code file for this conversion routine can be found in the DOOM-FX GitHub repository and is named ripdoom3.asm. Certain preparations must be made to the map beforehand, such as removing two-sided linedefs with middle textures and (optionally) replacing them with solid blocking geometry, as the Reality Engine does not support such. Other elements, such as unsupported thing types, are filtered out or remapped dynamically by the converter tool. The results of the tool are stored in 15 separate files, which are linked into the ROM directly as data and addressed using various disparate lookup tables.
This format documentation is not yet complete.
Equivalents to Doom lumps
LINES
| Offset
|
Size (bytes)
|
C99 type
|
Description
|
| 0 |
2 |
uint16_t
|
First vertex
|
| 2 |
2 |
uint16_t
|
Second vertex
|
| 4 |
2 |
uint16_t
|
Flags
|
| 6 |
2 |
int16_t
|
Angle[lines 1]
|
| 8 |
2 |
-
|
Unknown
|
| 10 |
1 |
uint8_t
|
Action
|
| 11 |
1 |
uint8_t
|
Tag
|
- ↑ Angles are stored as 16-bit BAMs, with 0 being east, 0x4000 being north, etc.
Flag values
| Source name |
Purpose |
Hexadecimal
|
| rllfSolid |
Blocks movement |
0x0001
|
| rllfMapped |
Seen on automap |
0x0002
|
| rllfUsed |
Line has been used |
0x0004
|
| rllfSecret |
Looks solid on automap |
0x0008
|
| rllfDoor |
Line is a door |
0x0010
|
| rllfDontDraw |
Invisible on automap |
0x0020
|
| rllfFloorH |
Floor height changes |
0x0100
|
| rllfCeilingH |
Ceiling height changes |
0x0200
|
| rllfTrigger |
Line is a trigger |
0x0400
|
| rllfUsable |
Line is usable |
0x0800
|
| rllfTriggerE |
Enemies can trigger |
0x1000
|
| rllfUsableE |
Enemies can use |
0x2000
|
| rllfItem |
Line is "item" (unknown) |
0x8000
|
OBJECTS
Objects are a variable-length record. The angle field is only present for "angular" object types, which includes player starts, deathmatch starts, and teleport destinations.
| Offset
|
Size (bytes)
|
C99 type
|
Description
|
| 0 |
1 |
uint8_t
|
Flags
|
| 1 |
1 |
uint8_t
|
Type
|
| 2 |
2 |
int16_t
|
x position
|
| 4 |
2 |
int16_t
|
y position
|
| 2 |
2 |
uint16_t
|
Angle[things 1]
|
- ↑ Angles are stored as 16-bit BAMs, with 0 being east, 0x4000 being north, etc. The angle is only present if type has a value between 0 and 5.
Flag values
| Source name |
Purpose |
Hexadecimal
|
| rlpfSkill12 |
Present on easy skills |
0x01
|
| rlpfSkill3 |
Present on medium skill |
0x02
|
| rlpfSkill45 |
Present on hard skills |
0x04
|
| rlpfMultiPlayer |
Present in multiplayer |
0x10
|
| rlpfMovable |
Object can move |
0x40
|
| rlpfActive |
Object is present in gamesim |
0x80
|
Object types
The following are valid values for the type field. Note that multiple Doom thing types can be converted into the same object type, as fewer types are supported in the Reality Engine.
| Value |
Source name |
Corresponding DoomEd numbers
|
| 0 |
Player1Start |
1
|
| 1 |
Player2Start |
2
|
| 2 |
Player3Start |
3
|
| 3 |
Player4Start |
4
|
| 4 |
DeathMatchStart |
11
|
| 5 |
TeleportSpot |
14
|
| 6 |
Soldier |
3004
|
| 7 |
Sergeant |
9
|
| 8 |
Trooper |
3001
|
| 9 |
Demon |
3002, 58
|
| 10 |
CacoDemon |
3005
|
| 11 |
LostSoul |
3006
|
| 12 |
BaronOfHell |
3003
|
| 13 |
CyberDemon |
16
|
| 14 |
SpiderDemon |
7
|
| 15 |
ShotGun |
2001
|
| 16 |
ChainSaw |
2005
|
| 17 |
ChainGun |
2002
|
| 18 |
RocketLauncher |
2003
|
| 19 |
PlasmaGun |
2004
|
| 20 |
BFG9000 |
2006
|
| 21 |
RedKeyCard |
13
|
| 22 |
BlueKeyCard |
5
|
| 23 |
YellowKeyCard |
6
|
| 24 |
RedSkullKey |
38
|
| 25 |
YellowSkullKey |
39
|
| 26 |
BlueSkullKey |
40
|
| 27 |
BackPack |
8
|
| 28 |
Clip |
2007
|
| 29 |
AmmoBox |
2048
|
| 30 |
Shells |
2008
|
| 31 |
ShellsBox |
2049
|
| 32 |
Rocket |
2010
|
| 33 |
RocketBox |
2046
|
| 34 |
Cell |
2047
|
| 35 |
CellPack |
17
|
| 36 |
StimPak |
2011
|
| 37 |
Medikit |
2012
|
| 38 |
HealthBonus |
2014
|
| 39 |
ArmorBonus |
2015
|
| 40 |
ArmorGreen |
2018
|
| 41 |
ArmorBlue |
2019
|
| 42 |
SoulSphere |
2013
|
| 43 |
Invulnerable |
2022
|
| 44 |
Berserk |
2023
|
| 45 |
Invisible |
2024
|
| 46 |
RadiationSuit |
2025
|
| 47 |
ComputerMap |
2026
|
| 48 |
LightGoggles |
2045
|
| 49 |
Barrel |
2035
|
| 50 |
FloorLamp |
2028
|
| 51 |
BloodyMess |
10, 12, 15, 18, 19
|
| 52 |
DeadTrooper |
20
|
| 53 |
DeadDemon |
21
|
| 54 |
SkullOnPole |
28
|
| 55 |
PillarShortGreen |
30, 31, 32, 33, 36, 37
|
| 56 |
Candle |
34
|
| 57 |
Candelabra |
35
|
| 58 |
FlamingSkullRock |
42
|
| 59 |
TreeGray |
43
|
| 60 |
FireStickTallRed |
44, 45, 46
|
| 61 |
ShrubBrown |
47
|
| 62 |
ColumnTechTall |
48
|
| 63 |
FireStickShortBlue |
55, 56, 57
|
VERTEXES
The RL vertex format is the same as the vanilla Doom vertex format.
| Offset
|
Size (bytes)
|
C99 type
|
Description
|
| 0 |
2 |
int16_t
|
x position
|
| 2 |
2 |
int16_t
|
y position
|
