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(svn r756) Demystify and explain some piece of code regarding which house sprite to draw

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tron 2004-11-22 10:09:37 +00:00
parent 6d81770985
commit 40a04816a4
1 changed files with 10 additions and 6 deletions
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16
town_cmd.c
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@ -52,12 +52,16 @@ static void DrawTile_Town(TileInfo *ti)
/* Retrieve pointer to the draw town tile struct */
{
uint hash, t;
hash = ti->x >> 4;
hash ^= hash>>2;
hash ^= (t=(ti->y >> 4));
hash -= t>>2;
dcts = &_town_draw_tile_data[((_map2[ti->tile]<<4)|(_map3_lo[ti->tile]>>6)|((hash&3)<<2))];
/* this "randomizes" on the (up to) 4 variants of a building */
byte gfx = _map2[ti->tile];
byte stage = _map3_lo[ti->tile] >> 6;
uint variant;
variant = ti->x >> 4;
variant ^= ti->x >> 6;
variant ^= ti->y >> 4;
variant -= ti->y >> 6;
variant &= 3;
dcts = &_town_draw_tile_data[gfx << 4 | variant << 2 | stage];
}
z = ti->z;