# 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_spritegroup.h"
    00015 #include "date_func.h"
    00016 #include "depot_base.h"
    00017
    00018 static uint32 RailTypeGetRandomBits(const ResolverObject *object)
    00019 {
    00020   TileIndex tile = object->u.routes.tile;
    00021   uint tmp = CountBits(tile + (TileX(tile) + TileY(tile)) * TILE_SIZE);
    00022   return GB(tmp, 0, 2);
    00023 }
    00024
    00025 static uint32 RailTypeGetTriggers(const ResolverObject *object)
    00026 {
    00027   return 0;
    00028 }
    00029
    00030 static void RailTypeSetTriggers(const ResolverObject *object, int triggers)
    00031 {
    00032 }
    00033
    00034 static uint32 RailTypeGetVariable(const ResolverObject *object, byte variable, uint32 parameter, bool *available)
    00035 {
    00036   TileIndex tile = object->u.routes.tile;
    00037
    00038   if (tile == INVALID_TILE) {
    00039     switch (variable) {
    00040       case 0x40: return 0;
    00041       case 0x41: return 0;
    00042       case 0x42: return 0;
    00043       case 0x43: return _date;
    00044     }
    00045   }
    00046
    00047   switch (variable) {
    00048     case 0x40: return GetTerrainType(tile, object->u.routes.context);
    00049     case 0x41: return 0;
    00050     case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
    00051     case 0x43:
    00052       if (IsRailDepotTile(tile)) return Depot::GetByTile(tile)->build_date;
    00053       return _date;
    00054   }
    00055
    00056   DEBUG(grf, 1, "Unhandled rail type tile variable 0x%X", variable);
    00057
    00058   *available = false;
    00059   return UINT_MAX;
    00060 }
    00061
    00062 static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
    00063 {
    00064   if (group->num_loading > 0) return group->loading[0];
    00065   if (group->num_loaded  > 0) return group->loaded[0];
    00066   return NULL;
    00067 }
    00068
    00069 static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile, TileContext context, const GRFFile *grffile)
    00070 {
    00071   res->GetRandomBits = &RailTypeGetRandomBits;
    00072   res->GetTriggers   = &RailTypeGetTriggers;
    00073   res->SetTriggers   = &RailTypeSetTriggers;
    00074   res->GetVariable   = &RailTypeGetVariable;
    00075   res->ResolveReal   = &RailTypeResolveReal;
    00076
    00077   res->u.routes.tile = tile;
    00078   res->u.routes.context = context;
    00079
    00080   res->callback        = CBID_NO_CALLBACK;
    00081   res->callback_param1 = 0;
    00082   res->callback_param2 = 0;
    00083   res->ResetState();
    00084
    00085   res->grffile         = grffile;
    00086 }
    00087
    00096 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context)
    00097 {
    00098   assert(rtsg < RTSG_END);
    00099
    00100   if (rti->group[rtsg] == NULL) return 0;
    00101
    00102   const SpriteGroup *group;
    00103   ResolverObject object;
    00104
    00105   NewRailTypeResolver(&object, tile, context, rti->grffile[rtsg]);
    00106
    00107   group = SpriteGroup::Resolve(rti->group[rtsg], &object);
    00108   if (group == NULL || group->GetNumResults() == 0) return 0;
    00109
    00110   return group->GetResult();
    00111 }
    00112
    00119 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
    00120 {
    00121   /* No rail type table present, return rail type as-is */
    00122   if (grffile == NULL || grffile->railtype_max == 0) return railtype;
    00123
    00124   /* Look for a matching rail type label in the table */
    00125   RailTypeLabel label = GetRailTypeInfo(railtype)->label;
    00126   for (uint i = 0; i < grffile->railtype_max; i++) {
    00127     if (label == grffile->railtype_list[i]) return i;
    00128   }
    00129
    00130   /* If not found, return as invalid */
    00131   return 0xFF;
    00132 }
    00133
    00139 void GetRailTypeResolver(ResolverObject *ro, uint index)
    00140 {
    00141   /* There is no unique GRFFile for the tile. Multiple GRFs can define different parts of the railtype.
    00142    * However, currently the NewGRF Debug GUI does not display variables depending on the GRF (like 0x7F) anyway. */
    00143   NewRailTypeResolver(ro, index, TCX_NORMAL, NULL);
    00144 }