Mercurial > hg > openttd
changeset 8791:2693434c1f4c draft
(svn r12513) -Codechange: rename OriginalTileRandomiser something more descriptive
| author | skidd13 <skidd13@openttd.org> |
|---|---|
| date | Mon, 31 Mar 2008 15:10:24 +0000 |
| parents | 5ef0059ccfc0 |
| children | 0884d4e77525 |
| files | src/newgrf_house.cpp src/town.h src/town_cmd.cpp |
| diffstat | 3 files changed, 18 insertions(+), 12 deletions(-) [+] |
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--- a/src/newgrf_house.cpp +++ b/src/newgrf_house.cpp @@ -216,7 +216,7 @@ switch (variable) { /* Construction stage. */ - case 0x40: return (IsTileType(tile, MP_HOUSE) ? GetHouseBuildingStage(tile) : 0) | OriginalTileRandomiser(TileX(tile), TileY(tile)) << 2; + case 0x40: return (IsTileType(tile, MP_HOUSE) ? GetHouseBuildingStage(tile) : 0) | TileHash2Bit(TileX(tile), TileY(tile)) << 2; /* Building age. */ case 0x41: return Clamp(_cur_year - GetHouseConstructionYear(tile), 0, 0xFF); @@ -340,7 +340,7 @@ pal = HasBit(callback, 14) ? GB(callback, 0, 8) + SPR_2CCMAP_BASE : callback; } } else { - pal = hs->random_colour[OriginalTileRandomiser(ti->x, ti->y)] + PALETTE_RECOLOR_START; + pal = hs->random_colour[TileHash2Bit(ti->x, ti->y)] + PALETTE_RECOLOR_START; } } } else {
--- a/src/town.h +++ b/src/town.h @@ -314,7 +314,7 @@ extern Town *_cleared_town; extern int _cleared_town_rating; -uint OriginalTileRandomiser(uint x, uint y); +uint TileHash2Bit(uint x, uint y); void ResetHouses(); void ClearTownHouse(Town *t, TileIndex tile);
--- a/src/town_cmd.cpp +++ b/src/town_cmd.cpp @@ -129,15 +129,21 @@ TownDrawHouseLift }; -uint OriginalTileRandomiser(uint x, uint y) +/** + * Calculate a hash value from a tile position + * + * @param x The X coordinate + * @param y The Y coordinate + * @return The hash of the tile + */ +uint TileHash2Bit(uint x, uint y) { - uint variant; - variant = x >> 4; - variant ^= x >> 6; - variant ^= y >> 4; - variant -= y >> 6; - variant &= 3; - return variant; + uint hash = x >> 4; + hash ^= x >> 6; + hash ^= y >> 4; + hash -= y >> 6; + hash &= 3; + return hash; } /** @@ -175,7 +181,7 @@ } /* Retrieve pointer to the draw town tile struct */ - dcts = &_town_draw_tile_data[house_id << 4 | OriginalTileRandomiser(ti->x, ti->y) << 2 | GetHouseBuildingStage(ti->tile)]; + dcts = &_town_draw_tile_data[house_id << 4 | TileHash2Bit(ti->x, ti->y) << 2 | GetHouseBuildingStage(ti->tile)]; if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);