OpenTTD Landscape Internals

Landscape

Five 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
NOTE: counting the bits starts with bit0 in the most left position (eg. a bit screwed LE format; BIT by BIT)

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

class	m1 (8)	m2 (16)	m3 (8)	m4 (8)	type_height (8)	m5 (8)
bits	0123 4567	0123 4567 0123 4567	0123 4567	0123 4567	0123 4567	0123 4567
(0) ground	XXXX XXXX	OOOO OOOO OOOO OOOO	XXXX OOOO	OOXX XXXX	XXXX XXXX	XXXX XOXX
(1) rail	XXXX XXXX	XXXX XXXX OOOO OOOO	XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX
depot/checkpoint	-inherit-	OOOO OOOO OOOO OOOO	XXXX XOOO	XXXX XXXX	-inherit-	XXXO OOXX
(2) road	XXXX XXXX	XXXX XXXX XXXX XXXX	OOOO OOOO	XXXX XXXX	XXXX XXXX	XXXX XXXX
level crossing	-inherit-	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	-inherit-	OOXX XXXX
road depot	-inherit-	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOX	-inherit-	XXXX XXXX
(3) town	XXXX XXXX	XXXX XXXX XXXX XXXX	OOOO OOXX	XXXX XXXX	XXXX XXXX	XXXX XXOX
(4) trees	XXXX XXXX	XXXX XXOO OOOO OOOO	XXXX XXXX	OOXX XXXX	XXXX XXXX	XXXO OOXX
(5) station	XXXX XXXX	XXXX XXXX XXXX XXXX	XXXX XOOO	XXXX XXXX	XXXX XXXX	XXXX XXXX
(6) water	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOO	XXXX XXXX	XXXX XXXX
(8) industry	XXXX XOOX	XXXX XXXX XXXX XXXX	OOOO OOOO	OOOO OOOO	XXXX XXXX	XXXX XXXX
bubble/sugar/toffee	-inherit-	-inherit-	XXXX XXXX	OOOO OOOO	-inherit-	-inherit-
toy factory	-inherit-	-inherit-	XXXX XXXX	XXXX XXXX	-inherit-	-inherit-
gold/copper/coal	XXXX XXXX	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-
oil wells	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-
power station	XXXX XXOX	-inherit-	-inherit-	-inherit-	-inherit-	-inherit-
(9) tunnel	XXXX XXXX	OOOO OOOO OOOO OOOO	XXXX OOOO	OOOO OOOX	XXXX XXXX	XXXX XXXX
bridge	XXXX XXXX	XXXX XXXX OOOO OOOO	XXXX XXXX	OOOO OOOX	XXXX XXXX	XXXX XXXX
(10) various (HQ)	XXXX XXXX	OOOO OOOO OOOO OOOO	OOOO OOOO	OOOO OOOO	XXXX XXXX	XXXX XXXX