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, i.e. other bits define the actual meaning.
~ - bit is accessed, but does not really have a meaning (e.g. owner of clear land is always OWNER_NONE)

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
m7 - 8 bits in size, is used for general storage

class		type_height (8)	m1 (8)	m2 (16)	m3 (8)	m4 (8)	m5 (8)	m6 (8)	m7 (8)
bits		7654 3210	7654 3210	FEDC BA98 7654 3210	7654 3210	7654 3210	7654 3210	7654 3210	7654 3210
0	ground	XXXX XXXX	OOO~ ~~~~	OOOO OOOO OOOO OOOO	OOOX OOOO	XXXX XXOO	XXXX XXXX	XXOO OOXX	OOOO OOOO
0	farmland	-inherit-	-inherit-	XXXX XXXX XXXX XXXX	OOOX XXXX	-inherit-	-inherit-	XXOO OOXX	OOOO OOOO
1	rail	XXXX XXXX	OOOX XXXX	OOOO XXXX OOOO OOOO	OOOO XXXX	OOOO XXXX	XXXX XXXX	XXOO OOXX	OOOO OOOO
	rail with signals	-inherit-	-inherit-	OOOO XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	-inherit-	XXOO OOXX	OOOO OOOO
	depot	-inherit-	-inherit-	XXXX XXXX XXXX XXXX	OOOO XXXX	OOOO XXXX	XXOX OXXX	XXOO OOXX	OOOO OOOO
2	road	XXXX XXXX	OOOX XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	OOOO OOOO	XXXX XXXX	XXXX XOXX	XXXO XXXX
	level crossing	-inherit-	-inherit-	-inherit-	XXXX XXXX	-inherit-	XXXX OOOX	XXXX XOXX	XXXX XXXX
	road depot	-inherit-	-inherit-	-inherit-	OOOO OOOO	OOOO OOOO	XXOO OOXX	XXOO OOXX	XXXO OOOO
3	house	XXXX XXXX	XXXX XXXX	XXXX XXXX XXXX XXXX	XXX~ ~~XX	XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX
4	trees	XXXX XXXX	OOO~ ~~~~	OOOO OOOX XXXX XXXX	~~XX XXXX	XXXX XXOO	XXOO OXXX	OOOO OOXX	OOOO OOOO
5	rail station	XXXX XXXX	OXXX XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX	OOXX XXXX	XXXX XXXX
	rail waypoint	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-
	road stop	-inherit-	-inherit-	-inherit-	XXXX OOOO	OOOO OOOO	~~~~ ~XXX	OOXX XXXX	XXOX XXXX
	dock	-inherit-	-inherit-	-inherit-	OOOO OOOO	OOOO OOOO	~~~~ ~XXX	OOXX XOXX	OOOO OOOO
	airport	-inherit-	-inherit-	-inherit-	XXXX OOOO	OOOO OOOO	XXXX XXXX	OOXX XOXX	XXXX XXXX
	buoy	-inherit-	-inherit-	-inherit-	OOOO OOOO	OOOO OOOO	~~~~ ~~~~	OOXX XOXX	OOOO OOOO
	oilrig	-inherit-	-inherit-	-inherit-	OOOO OOOO	OOOO OOOO	~~~~ ~~~~	OOXX XOXX	OOOO OOOO
6	sea, shore	XXXX XXXX	OXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOO	X~~X XXXX	XXOO OOXX	OOOO OOOO
	canal, river	-inherit-	-inherit-	OOOO OOOO OOOO OOOO	OOOO OOOO	XXXX XXXX	-inherit-	XXOO OOXX	OOOO OOOO
	shipdepot	-inherit-	-inherit-	XXXX XXXX XXXX XXXX	OOOO OOOO	OOOO OOOO	-inherit-	XXOO OOXX	OOOO OOOO
8	industry	XXXX XXXX	XXXO XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX	OOXX XXXX	XXXX XXXX
9	tunnel entrance	XXXX XXXX	OOOX XXXX	OOOO OOOO OOOO OOOO	XXXX XXXX	OOOO OOOO	XOOX XXXX	XXOO OOXX	XXXX XOXX
9	bridge ramp	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	XXXX XXXX	-inherit-
A	objects	XXXX XXXX	OXXX XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	OOOO OOOO	XXXX XXXX	XXOO OOXX	OOOO OOOO