OpenTTD Landscape Internals

Landscape

Nine 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.

type - 8 bits in size, tile class (bits 4..7), bridge (bits 2..3) tropic zone (bits 0..1, only valid in tropic climate)
height - 8 bits in size, stores tile height
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, is used for general storage
m7 - 8 bits in size, is used for general storage
m8 - 16 bits in size, is used for general storage

O - bit is free
X - bit is used, but could be freed if needed
X - bit is used
X - bit is used for an index on a pool
P - bit is introduced by a patch
X - bit of attribute is abused for different purposes, i.e. other bits define the actual meaning
X - bit is accessed, but a rearrangement of the map array could free some of these bits (probably not done for bit alignment)

class		type (8)	height (8)	m1 (8)	m2 (16)	m3 (8)	m4 (8)	m5 (8)	m6 (8)	m7 (8)	m8 (16)
bits		7654 3210	7654 3210	7654 3210	FEDC BA98 7654 3210	7654 3210	7654 3210	7654 3210	7654 3210	7654 3210	FEDC BA98 7654 3210
0	ground	XXXX XX XX	XXXX XXXX	OOO1 OOOO	OOOO OOOO OOOO OOOO	XXX XOOOO	XXX XXXOO	XXX XXX XX	OOOX XXOO	OOOO OOOO	OOOO OOOO OOOO OOOO
0	farmland			OOO1 OOOO	XXXX XXXX XXXX XXXX	XXX XXXXX	XXX XXXOO	XXX XXX XX	OOOX XXOO	OOOO OOOO	OOOO OOOO OOOO OOOO
1	rail			XOOX XXXX	OOOO XXXX OOOO OOOO	OOOO OOOO	OOOO XXXX	OO XXXXXX	OOOO OOOO	OOOO OOOO	OOOO PPPP PPXX XXXX
	rail with signals			XPPX XXXX	OOOP XXXX XXXX XXXX	XXXX OOOO	XXXX XXXX	O1 XXXXXX	PPPP PPPP	PP PPPPPP	OOOO PPPP PPXX XXXX
	depot			XOOX XXXX	XXXX XXXX XXXX XXXX	OOOO OOOO	OOOO XXXX	11OX OOXX	OOOO OOOO	OOOO OOOO	OOOO OOOO OOXX XXXX
2	road			OOOX XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	OOXX XXXX	OO XX XXXX	OO XXXOOO	OOX OXXXX	OPPP XXXX XXOO OOOO
	level crossing			OOOX XXXX	XXXX XXXX XXXX XXXX	XXXX OOOO		O1 X XOOPX	OO XXXOOO	OOX XXXXX	OPPP XXXX XX XXXXXX
	road depot			OOOX XXXX	XXXX XXXX XXXX XXXX	XXXX OOOO		1OOO OOXX	OOOO OOOO	OOX XXXXX	OPPP XXXX XXOO OOOO
3	finished house			XXXX XXXX	XXXX XXXX XXXX XXXX	1 XOXXXXX	XXXX XXXX	XXXX XXXX	XXXX XXOO	XXXX XXXX	OOOO OOOO OOOO OOOO
3	house under construction			XXXX XXXX	XXXX XXXX XXXX XXXX	O XOXXXXX	XXXX XXXX	OOOXX XXX	XXXX XXOO	XXXX XXXX	OOOO OOOO OOOO OOOO
4	trees			OXX1 OOOO	OOOO OOOXXX XX OOOO	XXXX XXXX	OOOO OOOO	XXOO OXXX	OOOO OOOO	OOOO OOOO	OOOO OOOO OOOO OOOO
5	rail station			OXX XXXXX	XXXX XXXX XXXX XXXX	XXXX OOOO	XXXX XXXX	XXXX XXXX	XXXXXXXX	XXXX XXXX	OOOO OOOO OOXX XXXX
	rail waypoint					XXXX OOOO	XXXX XXXX	OOOO OOOX	XXXXXXXX	XXXX XXXX	OOOO OOOO OOXX XXXX
	road stop					XXXX OOPP	OOXX XXXX	OOOO OXXX	OXXX XOOO	OOOX XXXX	OPPP XXXX XX XXXXXX
	road waypoint					XXXX XXPP	OOXX XXXX	OOOO OXXX		OOOX XXXX	XPPP XXXX XX XXXXXX
	airport					XXXX OOOO	OOOO OOOO	XXXX XXXX		XXXX XXXX	OOOO OOOO OOOO OOOO
	dock					OOOO OOOO	OOOO OOOO	OOOO OXXX		OOOO OOOO
	buoy					OOOO OOOO	OOOO OOOO	OOOO OOOO		OOOO OOOO
	oilrig					OOOO OOOO	OOOO OOOO	OOOO OOOO		OOOO OOOO
6	sea, shore			X XX XXXXX	OOOO OOOO OOOO OOOO	OOOO OOOP	OOOO OOOO	OOOO OOOX	OOOO OOOO	OOOO OOOO	OOOO OOOO OOOO OOOO
	canal, river						XXXX XXXX	OOOO OOOO
	lock						OOOO OOOO	OOO1 XX XX
	shipdepot				XXXX XXXX XXXX XXXX		OOOO OOOO	1OOO OOX X
8	finished industry			1 XXO OOOO	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX	OOXXX XOO	XXXX XXXX	OOOO OOOO OOOO OOOO
8	industry under construction			O XXO XXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	XXXX XXXX	XXXX XXXX	OOXXX XOO	XXXX XXXX	OOOO OOOO OOOO OOOO
9	tunnel entrance			OOP XXXXX	PPPP PPPP PPPP PPPP	XXXX OOOO P P PPPPPP	OOXX XXXX	OPPX XX XX	PPOO OOPP	PPPX XXXX	PPPP XXXX XXXX XXXX
	bridge ramp - rail				PPPP PPPP PPPP PPPP		OOPP PPPP	1PPO 00 XX	PPXX XXPP		PPPP PPPP PPXX XXXX
	bridge ramp - road				OOOO OOOO PPPP PPPP		OOXX XXXX	1OOO 01 XX	OOXX XXOO		OPPP XXXX XXOO OOOO
	bridge ramp - water			XOO XXXXX	OOOO OOOO OOOO OOOO		OOOO OOOO	1OOO 10 XX	OOXX XXOO		OOOO OOOO OOOO OOOO
A	objects			OXX XXXXX	XXXX XXXX XXXX XXXX	XXXX XXXX	PPP P PP PP	XXXX XXXX	OOOO OOPP	XXXX XXXX	OOOO OOOO OOOO OOOO
bits		7654 3210	7654 3210	7654 3210	FEDC BA98 7654 3210	7654 3210	7654 3210	7654 3210	7654 3210	7654 3210	FEDC BA98 7654 3210
class		type (8)	height (8)	m1 (8)	m2 (16)	m3 (8)	m4 (8)	m5 (8)	m6 (8)	m7 (8)	m8 (16)