NML:General

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Props, Vars and CBs

General variables

A number of global variables are available. Some are only available in switch-blocks, while others can be used in any expression. This is indicated by the second column in the following table:

name Available outside switch blocks Value range Comment
ttd_platform Yes PLATFORM_TTDPATCH or PLATFORM_OPENTTD
ttdpatch_version Yes
openttd_version Yes Use version_openttd(MAJOR, MINOR, BUILD) to test and compare for a release version and version_openttd(MAJOR, MINOR, BUILD, REVISION) to test for a specific svn version of OpenTTD
current_palette Yes PALETTE_DOS or PALETTE_WIN
current_date No days since year 0 Use date(year, month, day) to compare with.
current_year No 0 .. 5000000
current_month No 0 .. 11
current_day_of_month No 0 .. 30
current_day_of_year No 0 .. 364 (365 in leap years)
is_leapyear No 0 or 1
date_loaded Yes days since year 0 Set to the time of game load, which is the current date in single player, and the date the server started in multiplayer. This to prevent desyncs.
year_loaded Yes years since year 0 See date_loaded.
starting_year Yes years since year 0 Years before 1920 are clamped to 1920
animation_counter No 0 .. 65535 Increased by 1 each tick
climate Yes [1] CLIMATE_XXX with XXX = [TEMPERATE | ARCTIC | TROPICAL | TOYLAND]
game_mode Yes GAMEMODE_XXX with XXX = [MENU | GAME | EDITOR]
loading_stage Yes LOADING_STAGE_XXX with XXX = [INITIALIZE | RESERVE | ACTIVATE | TEST] 'Phase' of the GRF loading process.
difficulty_level Yes [1] DIFFICULTY_XXX with XXX = [EASY | MEDIUM | HARD | CUSTOM]
display_options No bitmask of DISPLAY_XXX with XXX = [TOWN_NAMES | STATION_NAMES | SIGNS | ANIMATION | FULL_DETAIL] Use hasbit(display_options, DISPLAY_XXX) to test a particular bit.
desert_paved_roads Yes [2] 0 or 1 If 1, desert roads have pavement and street lights.
second_rocky_tileset Yes [2] 0 or 1 Supported by OpenTTD 1.5 (r27200)1.5 Not supported by TTDPatch If 1, rocky tiles are drawn using sprites from two ranges: 4023 - 4041 (always used) and 4042 - 4060 (used if enabled)
train_width_32_px Yes [2] 0 or 1 If 1, train vehicles are 32 instead of 29 pixels wide in the depot view.
traininfo_y_offset Yes [2] -128 .. 127 Used to correctly position the depot view of trains.
snowline_height No NML 0.2 16 .. 120 in steps of 8, or 0xFF if no snow.

NML 0.3 0..max_tile_height, or 0xFF if no snow.

NML 0.2 One tile height is equivalent to 8 units.

NML 0.3 It's the height in tiles.

traffic_side Yes [1] TRAFFIC_SIDE_LEFT or TRAFFIC_SIDE_RIGHT
freight_trains Yes 1 .. 255 Weight multiplier for freight trains
plane_speed Yes 1 .. 4 Speed multiplier for planes. Value of 1 is equal to the original speed (1/4), while 4 means that planes move at full speed (4/4)
ttdpatch_flags Yes
current_callback No Set to the ID of the current callback, useful for old-style callbacks.
extra_callback_info1 No Varies Extra callback information, meaning differs per callback.
extra_callback_info2 No Varies Extra callback information, meaning differs per callback.
last_computed_result No Result of the last (previously evaluated) switch block.
base_sprite_2cc Yes 0 .. 65535 Base sprite for 2cc (dual company colour) colour-maps
base_sprite_foundations Yes 0 .. 65535 Supported by OpenTTD 1.4 (r25230)1.4 Not supported by TTDPatch Base sprite for foundations. This sprite block does only contain the extra foundations from replacenew type FOUNDATIONS_SLOPES_HALFTILES or FOUNDATIONS_SLOPES. It does not contain the default foundations of sprites 990 to 1003 (via replace)
base_sprite_shores Yes 0 .. 65535 Supported by OpenTTD 1.4 (r25230)1.4 Not supported by TTDPatch Base sprite for shores. All coast sprites in the order of the 16 sprites version of replacenew type COAST_TILES. Note that, it does not matter in which way the sprites were originally defined (whether via replacenew with 10 or 16 sprites, or via replace). The sprite block returned by this variable has always all sprites in the same order.
map_type Yes MAP_TYPE_XXX with XXX = [RECTANGULAR | X_BIGGER | Y_BIGGER]
map_min_edge Yes 64 .. 4096 Length of the smallest map edge (in tiles)
map_max_edge Yes 64 .. 4096 Length of the biggest map edge (in tiles)
map_x_edge Yes 64 .. 4096 Length of the x (top-left) map edge (in tiles)
map_y_edge Yes 64 .. 4096 Length of the y (top-right) map edge (in tiles)
map_size Yes 64*64 .. 4096*4096 Total number of tiles on the map
long_bridges Yes 0 or 1
gradual_loading Yes 0 or 1
bridge_speed_limits Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
wagon_speed_limits Yes 0 or 1 NML 0.4
signals_on_traffic_side Yes 0 or 1
electrified_railways Yes 0 or 1
unified_maglev Yes Supported by TTDPatch 0 .. 3 Supported by OpenTTD Always 3
temperate_snowline Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 0
dynamic_engines Yes 0 or 1
variable_runningcosts Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newtrains Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newrvs Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newships Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newplanes Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newhouses Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newindustries Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
newcargos Yes Supported by TTDPatch 0 or 1 Supported by OpenTTD Always 1
  1. 1.0 1.1 1.2 The value of these variables can change during the game. Reading them from a switch block (which reads the current value) may result in a different value than in the rest of the code (which is evaluated when the game is loaded).
  2. 2.0 2.1 2.2 2.3 These variables can be written as well as read. Use a normal assignment, for example:
     traininfo_y_offset = -2;