# newgrf_railtype.cpp

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    00001 /* $Id$ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #include "stdafx.h"
    00013 #include "debug.h"
    00014 #include "newgrf.h"
    00015 #include "newgrf_spritegroup.h"
    00016 #include "date_func.h"
    00017 #include "depot_base.h"
    00018
    00019 static uint32 RailTypeGetRandomBits(const ResolverObject *object)
    00020 {
    00021   TileIndex tile = object->u.routes.tile;
    00022   uint tmp = CountBits(tile + (TileX(tile) + TileY(tile)) * TILE_SIZE);
    00023   return GB(tmp, 0, 2);
    00024 }
    00025
    00026 static uint32 RailTypeGetTriggers(const ResolverObject *object)
    00027 {
    00028   return 0;
    00029 }
    00030
    00031 static void RailTypeSetTriggers(const ResolverObject *object, int triggers)
    00032 {
    00033 }
    00034
    00035 static uint32 RailTypeGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
    00036 {
    00037   TileIndex tile = object->u.routes.tile;
    00038
    00039   if (tile == INVALID_TILE) {
    00040     switch (variable) {
    00041       case 0x40: return 0;
    00042       case 0x41: return 0;
    00043       case 0x42: return 0;
    00044       case 0x43: return _date;
    00045     }
    00046   }
    00047
    00048   switch (variable) {
    00049     case 0x40: return GetTerrainType(tile, object->u.routes.context);
    00050     case 0x41: return 0;
    00051     case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
    00052     case 0x43:
    00053       if (IsRailDepotTile(tile)) return Depot::GetByTile(tile)->build_date;
    00054       return _date;
    00055   }
    00056
    00057   DEBUG(grf, 1, "Unhandled rail type tile variable 0x%X", variable);
    00058
    00059   *available = false;
    00060   return UINT_MAX;
    00061 }
    00062
    00063 static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
    00064 {
    00065   if (group->num_loading > 0) return group->loading[0];
    00066   if (group->num_loaded  > 0) return group->loaded[0];
    00067   return NULL;
    00068 }
    00069
    00070 static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile, TileContext context)
    00071 {
    00072   res->GetRandomBits = &RailTypeGetRandomBits;
    00073   res->GetTriggers   = &RailTypeGetTriggers;
    00074   res->SetTriggers   = &RailTypeSetTriggers;
    00075   res->GetVariable   = &RailTypeGetVariable;
    00076   res->ResolveReal   = &RailTypeResolveReal;
    00077
    00078   res->u.routes.tile = tile;
    00079   res->u.routes.context = context;
    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 }
    00089
    00090 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context)
    00091 {
    00092   assert(rtsg < RTSG_END);
    00093
    00094   if (rti->group[rtsg] == NULL) return 0;
    00095
    00096   const SpriteGroup *group;
    00097   ResolverObject object;
    00098
    00099   NewRailTypeResolver(&object, tile, context);
    00100
    00101   group = SpriteGroup::Resolve(rti->group[rtsg], &object);
    00102   if (group == NULL || group->GetNumResults() == 0) return 0;
    00103
    00104   return group->GetResult();
    00105 }
    00106
    00107 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
    00108 {
    00109   /* No rail type table present, return rail type as-is */
    00110   if (grffile == NULL || grffile->railtype_max == 0) return railtype;
    00111
    00112   /* Look for a matching rail type label in the table */
    00113   RailTypeLabel label = GetRailTypeInfo(railtype)->label;
    00114   for (uint i = 0; i < grffile->railtype_max; i++) {
    00115     if (label == grffile->railtype_list[i]) return i;
    00116   }
    00117
    00118   /* If not found, return as invalid */
    00119   return 0xFF;
    00120 }
    00121
    00127 void GetRailTypeResolver(ResolverObject *ro, uint index)
    00128 {
    00129   NewRailTypeResolver(ro, index, TCX_NORMAL);
    00130 }