src/newgrf_railtype.cpp

   1 /* $Id: newgrf_railtype.cpp 26388 2014-03-03 20:02:31Z frosch $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file newgrf_railtype.cpp NewGRF handling of rail types. */
  11
  12 #include "stdafx.h"
  13 #include "debug.h"
  14 #include "newgrf_railtype.h"
  15 #include "date_func.h"
  16 #include "depot_base.h"
  17 #include "town.h"
  18
  19 #include "safeguards.h"
  20
  21 /* virtual */ uint32 RailTypeScopeResolver::GetRandomBits() const
  22 {
  23         uint tmp = CountBits(this->tile + (TileX(this->tile) + TileY(this->tile)) * TILE_SIZE);
  24         return GB(tmp, 0, 2);
  25 }
  26
  27 /* virtual */ uint32 RailTypeScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
  28 {
  29         if (this->tile == INVALID_TILE) {
  30                 switch (variable) {
  31                         case 0x40: return 0;
  32                         case 0x41: return 0;
  33                         case 0x42: return 0;
  34                         case 0x43: return _date;
  35                         case 0x44: return HZB_TOWN_EDGE;
  36                 }
  37         }
  38
  39         switch (variable) {
  40                 case 0x40: return GetTerrainType(this->tile, this->context);
  41                 case 0x41: return 0;
  42                 case 0x42: return IsLevelCrossingTile(this->tile) && IsCrossingBarred(this->tile);
  43                 case 0x43:
  44                         if (IsRailDepotTile(this->tile)) return Depot::GetByTile(this->tile)->build_date;
  45                         return _date;
  46                 case 0x44: {
  47                         const Town *t = nullptr;
  48                         if (IsRailDepotTile(this->tile)) {
  49                                 t = Depot::GetByTile(this->tile)->town;
  50                         } else if (IsLevelCrossingTile(this->tile)) {
  51                                 t = ClosestTownFromTile(this->tile, UINT_MAX);
  52                         }
  53                         return t != nullptr ? GetTownRadiusGroup(t, this->tile) : HZB_TOWN_EDGE;
  54                 }
  55         }
  56
  57         DEBUG(grf, 1, "Unhandled rail type tile variable 0x%X", variable);
  58
  59         *available = false;
  60         return UINT_MAX;
  61 }
  62
  63 /* virtual */ const SpriteGroup *RailTypeResolverObject::ResolveReal(const RealSpriteGroup *group) const
  64 {
  65         if (group->num_loading > 0) return group->loading[0];
  66         if (group->num_loaded  > 0) return group->loaded[0];
  67         return nullptr;
  68 }
  69
  70 /**
  71  * Resolver object for rail types.
  72  * @param rti Railtype. nullptr in NewGRF Inspect window.
  73  * @param tile %Tile containing the track. For track on a bridge this is the southern bridgehead.
  74  * @param context Are we resolving sprites for the upper halftile, or on a bridge?
  75  * @param rtsg Railpart of interest
  76  * @param param1 Extra parameter (first parameter of the callback, except railtypes do not have callbacks).
  77  * @param param2 Extra parameter (second parameter of the callback, except railtypes do not have callbacks).
  78  */
  79 RailTypeResolverObject::RailTypeResolverObject(const RailtypeInfo *rti, TileIndex tile, TileContext context, RailTypeSpriteGroup rtsg, uint32 param1, uint32 param2)
  80         : ResolverObject(rti != nullptr ? rti->grffile[rtsg] : nullptr, CBID_NO_CALLBACK, param1, param2), railtype_scope(*this, tile, context)
  81 {
  82         this->root_spritegroup = rti != nullptr ? rti->group[rtsg] : nullptr;
  83 }
  84
  85 /**
  86  * Get the sprite to draw for the given tile.
  87  * @param rti The rail type data (spec).
  88  * @param tile The tile to get the sprite for.
  89  * @param rtsg The type of sprite to draw.
  90  * @param content Where are we drawing the tile?
  91  * @param [out] num_results If not nullptr, return the number of sprites in the spriteset.
  92  * @return The sprite to draw.
  93  */
  94 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context, uint *num_results)
  95 {
  96         assert(rtsg < RTSG_END);
  97
  98         if (rti->group[rtsg] == nullptr) return 0;
  99
 100         RailTypeResolverObject object(rti, tile, context, rtsg);
 101         const SpriteGroup *group = object.Resolve();
 102         if (group == nullptr || group->GetNumResults() == 0) return 0;
 103
 104         if (num_results) *num_results = group->GetNumResults();
 105
 106         return group->GetResult();
 107 }
 108
 109 /**
 110  * Get the sprite to draw for a given signal.
 111  * @param rti The rail type data (spec).
 112  * @param tile The tile to get the sprite for.
 113  * @param type Signal type.
 114  * @param var Signal variant.
 115  * @param state Signal state.
 116  * @param gui Is the sprite being used on the map or in the GUI?
 117  * @return The sprite to draw.
 118  */
 119 SpriteID GetCustomSignalSprite(const RailtypeInfo *rti, TileIndex tile, SignalType type, SignalVariant var, SignalState state, bool gui)
 120 {
 121         if (rti->group[RTSG_SIGNALS] == nullptr) return 0;
 122
 123         uint32 param1 = gui ? 0x10 : 0x00;
 124         uint32 param2 = (type << 16) | (var << 8) | state;
 125         RailTypeResolverObject object(rti, tile, TCX_NORMAL, RTSG_SIGNALS, param1, param2);
 126
 127         const SpriteGroup *group = object.Resolve();
 128         if (group == nullptr || group->GetNumResults() == 0) return 0;
 129
 130         return group->GetResult();
 131 }
 132
 133 /**
 134  * Perform a reverse railtype lookup to get the GRF internal ID.
 135  * @param railtype The global (OpenTTD) railtype.
 136  * @param grffile The GRF to do the lookup for.
 137  * @return the GRF internal ID.
 138  */
 139 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
 140 {
 141         /* No rail type table present, return rail type as-is */
 142         if (grffile == nullptr || grffile->railtype_list.Length() == 0) return railtype;
 143
 144         /* Look for a matching rail type label in the table */
 145         RailTypeLabel label = GetRailTypeInfo(railtype)->label;
 146         int index = grffile->railtype_list.FindIndex(label);
 147         if (index >= 0) return index;
 148
 149         /* If not found, return as invalid */
 150         return 0xFF;
 151 }