newgrf_railtype.cpp

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00001 /* $Id: newgrf_railtype.cpp 19258 2010-02-25 21:18:38Z rubidium $ */
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 #include "core/bitmath_func.hpp"
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     }
00045   }
00046 
00047   switch (variable) {
00048     case 0x40: return GetTerrainType(tile);
00049     case 0x41: return 0;
00050     case 0x42: return IsLevelCrossingTile(tile) && IsCrossingBarred(tile);
00051   }
00052 
00053   DEBUG(grf, 1, "Unhandled rail type tile property 0x%X", variable);
00054 
00055   *available = false;
00056   return UINT_MAX;
00057 }
00058 
00059 static const SpriteGroup *RailTypeResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
00060 {
00061   if (group->num_loading > 0) return group->loading[0];
00062   if (group->num_loaded  > 0) return group->loaded[0];
00063   return NULL;
00064 }
00065 
00066 static inline void NewRailTypeResolver(ResolverObject *res, TileIndex tile)
00067 {
00068   res->GetRandomBits = &RailTypeGetRandomBits;
00069   res->GetTriggers   = &RailTypeGetTriggers;
00070   res->SetTriggers   = &RailTypeSetTriggers;
00071   res->GetVariable   = &RailTypeGetVariable;
00072   res->ResolveReal   = &RailTypeResolveReal;
00073 
00074   res->u.routes.tile = tile;
00075 
00076   res->callback        = CBID_NO_CALLBACK;
00077   res->callback_param1 = 0;
00078   res->callback_param2 = 0;
00079   res->last_value      = 0;
00080   res->trigger         = 0;
00081   res->reseed          = 0;
00082   res->count           = 0;
00083 }
00084 
00085 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg)
00086 {
00087   assert(rtsg < RTSG_END);
00088 
00089   if (rti->group[rtsg] == NULL) return 0;
00090 
00091   const SpriteGroup *group;
00092   ResolverObject object;
00093 
00094   NewRailTypeResolver(&object, tile);
00095 
00096   group = SpriteGroup::Resolve(rti->group[rtsg], &object);
00097   if (group == NULL || group->GetNumResults() == 0) return 0;
00098 
00099   return group->GetResult();
00100 }
00101 
00102 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
00103 {
00104   /* No rail type table present, return rail type as-is */
00105   if (grffile->railtype_max == 0) return railtype;
00106 
00107   /* Look for a matching rail type label in the table */
00108   RailTypeLabel label = GetRailTypeInfo(railtype)->label;
00109   for (uint i = 0; i < grffile->railtype_max; i++) {
00110     if (label == grffile->railtype_list[i]) return i;
00111   }
00112 
00113   /* If not found, return as invalid */
00114   return 0xFF;
00115 }

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