OpenTTD Landscape Internals

Landscape

Six attributes hold the information about a tile. This can be seen in the Landscape document. This page tries to give an overview of used and free bits of the array so you can quickly see what is used and what is not.

O - bit is free
X - bit is used
- bit of attribute is abused for different purposes

type_height - 8 bits in size, stores tile height (lower 4 bits) and tile class (upper 4 bits)
m1 - 8 bits in size, used to identify the owner of that tile (eg piece of rail, bridge, etc.)
m2 - 16 bits in size, used to identify the index of the given tile (object) in the (object-)array
m3 - 8 bits in size, is used for general storage
m4 - 8 bits in size, is used for general storage
m5 - 8 bits in size, is used for general storage
m6 - 8 bits in size, special meaning : lower 2 bits only valid in tropic climate, upper 2 bits for bridges

class		type_height (8)	m1 (8)	m2 (16)	m3 (8)	m4 (8)	m5 (8)	m6 (8)
bits		7654 3210	7654 3210	FEDC BA98 7654 3210	7654 3210	7654 3210	7654 3210	7654 3210
0	ground	XXXX XXXX	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	XXXX XXOO	XXXX XXXX	XXOO OOXX
0	farmland	-inherit-	-inherit-	XXXX XXXX XXXX XXXX	OOOO XXXX	-inherit-	OOOX XXXX	XXOO OOXX
1	rail	XXXX XXXX	XXXX XXXX	OOOO OOOO XXXX XXXX	XXXX XXXX	OOOO OXXX	XXXX XXXX	XXOO OOXX
	depot	-inherit-	-inherit-	OOOO OOOO OOOO OOOO	OOOO XXXX	OOOO XXXX	XXOO OXXX	XXOO OOXX
	waypoint	-inherit-	-inherit-	XXXX XXXX XXXX XXXX	OOOO XXXX	OOOO XXXX	XXOO OXXX	XXOO OOXX
2	road	XXXX XXXX	XXXX XXXX	XXXX XXXX XXXX XXXX	OOOO OOOO	XXXX XXXX	XXXX XXXX	XXOO OOXX
	level crossing	-inherit-	-inherit-	-inherit-	XXXX XXXX	XXXX XXXX	XXXX XXOO	XXOO OOXX
	road depot	-inherit-	-inherit-	OOOO OOOO OOOO OOOO	OOOO OOOO	XOOO OOOO	XXXX XXXX	XXOO OOXX
3	town	XXXX XXXX	XXXX XXXX	XXXX XXXX XXXX XXXX	XXOO OOOO	XXXX XXXX	XOXX XXXX	OOOO OOXX
4	trees	XXXX XXXX	XXXX XXXX	OOOO OOOO XXXX XXXX	XXXX XXXX	XXXX XXOO	XXOO OXXX	OOOO OOXX
5	station	XXXX XXXX	XXXX XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX	OOOO OOXX
6	water	XXXX XXXX	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOO	OOOO OOXX	XXOO OOXX
8	industry	XXXX XXXX	XOOX XXXX	XXXX XXXX XXXX XXXX	OOOO OOOO	OOOO OOOO	XXXX XXXX	OOOO OOXX
	bubble/sugar/toffee, gold/copper/coal, oil wells, power station	-inherit-	XOOO OOOO	-inherit-	XXXX XXXX	OOOO OOOO	-inherit-	-inherit-
	toy factory	-inherit-	XOOO OOOO	-inherit-	XXXX XXXX	XXXX XXXX	-inherit-	-inherit-
9	tunnel entrance	XXXX XXXX	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO XXXX	XOOO OOOO	XOOO XXXX	XXOO OOXX
9	bridge ramp	XXXX XXXX	XXXX XXXX	OOOO OOOO XXXX OOOO	OOOO XXXX	XOOO OOOO	XOOO XXXX	XXOO OOXX
A	unmovables	XXXX XXXX	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOO	XXXX XXXX	XXOO OOXX