newgrf_canal.cpp

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00001 /* $Id: newgrf_canal.cpp 15651 2009-03-09 13:38:00Z peter1138 $ */
00002 
00005 #include "stdafx.h"
00006 #include "core/overflowsafe_type.hpp"
00007 #include "tile_type.h"
00008 #include "debug.h"
00009 #include "newgrf_commons.h"
00010 #include "newgrf_spritegroup.h"
00011 #include "newgrf_canal.h"
00012 #include "tile_map.h"
00013 #include "water_map.h"
00014 
00015 
00017 WaterFeature _water_feature[CF_END];
00018 
00019 
00020 /* Random bits and triggers are not supported for canals, so the following
00021  * three functions are stubs. */
00022 static uint32 CanalGetRandomBits(const ResolverObject *object)
00023 {
00024   /* Return random bits only for water tiles, not station tiles */
00025   return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
00026 }
00027 
00028 
00029 static uint32 CanalGetTriggers(const ResolverObject *object)
00030 {
00031   return 0;
00032 }
00033 
00034 
00035 static void CanalSetTriggers(const ResolverObject *object, int triggers)
00036 {
00037   return;
00038 }
00039 
00040 
00041 static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00042 {
00043   TileIndex tile = object->u.canal.tile;
00044 
00045   switch (variable) {
00046     /* Height of tile */
00047     case 0x80: return GetTileZ(tile) / TILE_HEIGHT;
00048 
00049     /* Terrain type */
00050     case 0x81: return GetTerrainType(tile);
00051 
00052     /* Random data for river or canal tiles, otherwise zero */
00053     case 0x83: return GetWaterTileRandomBits(tile);
00054   }
00055 
00056   DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);
00057 
00058   *available = false;
00059   return UINT_MAX;
00060 }
00061 
00062 
00063 static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)
00064 {
00065   if (group->g.real.num_loaded == 0) return NULL;
00066 
00067   return group->g.real.loaded[0];
00068 }
00069 
00070 
00071 static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
00072 {
00073   res->GetRandomBits = &CanalGetRandomBits;
00074   res->GetTriggers   = &CanalGetTriggers;
00075   res->SetTriggers   = &CanalSetTriggers;
00076   res->GetVariable   = &CanalGetVariable;
00077   res->ResolveReal   = &CanalResolveReal;
00078 
00079   res->u.canal.tile = tile;
00080 
00081   res->callback        = CBID_NO_CALLBACK;
00082   res->callback_param1 = 0;
00083   res->callback_param2 = 0;
00084   res->last_value      = 0;
00085   res->trigger         = 0;
00086   res->reseed          = 0;
00087   res->count           = 0;
00088   res->grffile         = grffile;
00089 }
00090 
00091 
00092 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
00093 {
00094   ResolverObject object;
00095   const SpriteGroup *group;
00096 
00097   NewCanalResolver(&object, tile, _water_feature[feature].grffile);
00098 
00099   group = Resolve(_water_feature[feature].group, &object);
00100   if (group == NULL || group->type != SGT_RESULT) return 0;
00101 
00102   return group->g.result.sprite;
00103 }

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