newgrf_canal.cpp

00001 /* $Id: newgrf_canal.cpp 12042 2008-02-02 09:28:43Z peter1138 $ */
00002 
00003 #include "stdafx.h"
00004 #include "openttd.h"
00005 #include "variables.h"
00006 #include "landscape.h"
00007 #include "debug.h"
00008 #include "newgrf.h"
00009 #include "newgrf_callbacks.h"
00010 #include "newgrf_commons.h"
00011 #include "newgrf_spritegroup.h"
00012 #include "newgrf_canal.h"
00013 #include "tile_map.h"
00014 #include "water_map.h"
00015 
00016 
00018 WaterFeature _water_feature[CF_END];
00019 
00020 
00021 /* Random bits and triggers are not supported for canals, so the following
00022  * three functions are stubs. */
00023 static uint32 CanalGetRandomBits(const ResolverObject *object)
00024 {
00025   /* Return random bits only for water tiles, not station tiles */
00026   return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
00027 }
00028 
00029 
00030 static uint32 CanalGetTriggers(const ResolverObject *object)
00031 {
00032   return 0;
00033 }
00034 
00035 
00036 static void CanalSetTriggers(const ResolverObject *object, int triggers)
00037 {
00038   return;
00039 }
00040 
00041 
00042 static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00043 {
00044   TileIndex tile = object->u.canal.tile;
00045 
00046   switch (variable) {
00047     case 0x80:
00048       return GetTileZ(tile) / TILE_HEIGHT;
00049 
00050     case 0x81:
00051       return GetTerrainType(tile);
00052 
00053     case 0x83:
00054       return GetWaterTileRandomBits(tile);
00055   }
00056 
00057   DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);
00058 
00059   *available = false;
00060   return 0;
00061 }
00062 
00063 
00064 static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)
00065 {
00066   if (group->g.real.num_loaded == 0) return NULL;
00067 
00068   return group->g.real.loaded[0];
00069 }
00070 
00071 
00072 static void NewCanalResolver(ResolverObject *res, TileIndex tile)
00073 {
00074   res->GetRandomBits = &CanalGetRandomBits;
00075   res->GetTriggers   = &CanalGetTriggers;
00076   res->SetTriggers   = &CanalSetTriggers;
00077   res->GetVariable   = &CanalGetVariable;
00078   res->ResolveReal   = &CanalResolveReal;
00079 
00080   res->u.canal.tile = tile;
00081 
00082   res->callback        = CBID_NO_CALLBACK;
00083   res->callback_param1 = 0;
00084   res->callback_param2 = 0;
00085   res->last_value      = 0;
00086   res->trigger         = 0;
00087   res->reseed          = 0;
00088 }
00089 
00090 
00091 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
00092 {
00093   ResolverObject object;
00094   const SpriteGroup *group;
00095 
00096   NewCanalResolver(&object, tile);
00097 
00098   group = Resolve(_water_feature[feature].group, &object);
00099   if (group == NULL || group->type != SGT_RESULT) return 0;
00100 
00101   return group->g.result.sprite;
00102 }

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