diff options
Diffstat (limited to 'src/newgrf_commons.h')
-rw-r--r-- | src/newgrf_commons.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/newgrf_commons.h b/src/newgrf_commons.h index ec669d907..a77da3cd2 100644 --- a/src/newgrf_commons.h +++ b/src/newgrf_commons.h @@ -70,6 +70,25 @@ enum TileLayoutFlags { DECLARE_ENUM_AS_BIT_SET(TileLayoutFlags) /** + * Determines which sprite to use from a spriteset for a specific construction stage. + * @param construction_stage Construction stage 0 - 3. + * @param num_sprites Number of available sprites to select stage from. + * @return Sprite to use + */ +static inline uint GetConstructionStageOffset(uint construction_stage, uint num_sprites) +{ + assert(num_sprites > 0); + if (num_sprites > 4) num_sprites = 4; + switch (construction_stage) { + case 0: return 0; + case 1: return num_sprites > 2 ? 1 : 0; + case 2: return num_sprites > 2 ? num_sprites - 2 : 0; + case 3: return num_sprites - 1; + default: NOT_REACHED(); + } +} + +/** * Additional modifiers for items in sprite layouts. */ struct TileLayoutRegisters { |