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author | tron <tron@openttd.org> | 2004-12-16 12:30:13 +0000 |
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committer | tron <tron@openttd.org> | 2004-12-16 12:30:13 +0000 |
commit | 89fd12692f1999b1535d70589bab7366a9eee0f3 (patch) | |
tree | 2a4ccefd32e4f1b60ca59743de7ededf60c6e9ed | |
parent | 74a149127dbcb4b6c62c7b5adcbb4cba54ddaeb8 (diff) | |
download | openttd-89fd12692f1999b1535d70589bab7366a9eee0f3.tar.xz |
(svn r1130) Add helper functions to query map size
-rw-r--r-- | map.c | 3 | ||||
-rw-r--r-- | map.h | 12 |
2 files changed, 15 insertions, 0 deletions
@@ -2,6 +2,9 @@ #include "ttd.h" #include "map.h" +uint _map_log_x = TILE_X_BITS; +uint _map_log_y = TILE_Y_BITS; + byte _map_type_and_height[TILES_X * TILES_Y]; byte _map5[TILES_X * TILES_Y]; byte _map3_lo[TILES_X * TILES_Y]; @@ -18,4 +18,16 @@ extern byte _map_owner[TILES_X * TILES_Y]; extern byte _map2[TILES_X * TILES_Y]; extern byte _map_extra_bits[TILES_X * TILES_Y / 4]; +// binary logarithm of the map size, try to avoid using this one +static inline uint MapLogX(void) { extern uint _map_log_x; return _map_log_x; } +static inline uint MapLogY(void) { extern uint _map_log_y; return _map_log_y; } +/* The size of the map */ +static inline uint MapSizeX(void) { return 1 << MapLogX(); } +static inline uint MapSizeY(void) { return 1 << MapLogY(); } +/* The maximum coordinates */ +static inline uint MapMaxX(void) { return MapSizeX() - 1; } +static inline uint MapMaxY(void) { return MapSizeY() - 1; } +/* The number of tiles in the map */ +static inline uint MapSize(void) { return MapSizeX() * MapSizeY(); } + #endif |