newgrf_railtype.cpp

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00001 /* $Id: newgrf_railtype.cpp 19056 2010-02-07 22:22:54Z peter1138 $ */
00002 
00005 #include "stdafx.h"
00006 #include "openttd.h"
00007 #include "variables.h"
00008 #include "debug.h"
00009 #include "strings_type.h"
00010 #include "rail.h"
00011 #include "road_map.h"
00012 #include "newgrf.h"
00013 #include "newgrf_callbacks.h"
00014 #include "newgrf_commons.h"
00015 #include "newgrf_railtype.h"
00016 #include "newgrf_spritegroup.h"
00017 
00018 static uint32 RailTypeGetRandomBits(const ResolverObject *object)
00019 {
00020   return 0;
00021 }
00022 
00023 static uint32 RailTypeGetTriggers(const ResolverObject *object)
00024 {
00025   return 0;
00026 }
00027 
00028 static void RailTypeSetTriggers(const ResolverObject *object, int triggers)
00029 {
00030 }
00031 
00032 static uint32 RailTypeGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00033 {
00034   TileIndex tile = object->u.routes.tile;
00035 
00036   if (tile == INVALID_TILE) {
00037     switch (variable) {
00038       case 0x40: return 0;
00039       case 0x41: return 0;
00040       case 0x42: return 0;
00041     }
00042   }
00043 
00044   switch (variable) {
00045     case 0x40: return GetTerrainType(tile);
00046     case 0x41: return 0;
00047     case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
00048   }
00049 
00050   DEBUG(grf, 1, "Unhandled rail type tile property 0x%X", variable);
00051 
00052   *available = false;
00053   return UINT_MAX;
00054 }
00055 
00056 static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
00057 {
00058   if (group->num_loading > 0) return group->loading[0];
00059   if (group->num_loaded  > 0) return group->loaded[0];
00060   return NULL;
00061 }
00062 
00063 static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile)
00064 {
00065   res->GetRandomBits = &RailTypeGetRandomBits;
00066   res->GetTriggers   = &RailTypeGetTriggers;
00067   res->SetTriggers   = &RailTypeSetTriggers;
00068   res->GetVariable   = &RailTypeGetVariable;
00069   res->ResolveReal   = &RailTypeResolveReal;
00070 
00071   res->u.routes.tile = tile;
00072 
00073   res->callback        = CBID_NO_CALLBACK;
00074   res->callback_param1 = 0;
00075   res->callback_param2 = 0;
00076   res->last_value      = 0;
00077   res->trigger         = 0;
00078   res->reseed          = 0;
00079   res->count           = 0;
00080 }
00081 
00082 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg)
00083 {
00084   assert(rtsg < RTSG_END);
00085 
00086   if (rti->group[rtsg] == NULL) return 0;
00087 
00088   const SpriteGroup *group;
00089   ResolverObject object;
00090 
00091   NewRailTypeResolver(&object, tile);
00092 
00093   group = SpriteGroup::Resolve(rti->group[rtsg], &object);
00094   if (group == NULL || group->GetNumResults() == 0) return 0;
00095 
00096   return group->GetResult();
00097 }
00098 
00099 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
00100 {
00101   /* No rail type table present, return rail type as-is */
00102   if (grffile->railtype_max == 0) return railtype;
00103 
00104   /* Look for a matching rail type label in the table */
00105   RailTypeLabel label = GetRailTypeInfo(railtype)->label;
00106   for (uint i = 0; i < grffile->railtype_max; i++) {
00107     if (label == grffile->railtype_list[i]) return i;
00108   }
00109 
00110   /* If not found, return as invalid */
00111   return 0xFF;
00112 }

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