newgrf_railtype.cpp
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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, object->u.routes.upper_halftile);
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, bool upper_halftile)
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 res->u.routes.upper_halftile = upper_halftile;
00076
00077 res->callback = CBID_NO_CALLBACK;
00078 res->callback_param1 = 0;
00079 res->callback_param2 = 0;
00080 res->last_value = 0;
00081 res->trigger = 0;
00082 res->reseed = 0;
00083 res->count = 0;
00084 }
00085
00086 SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, bool upper_halftile)
00087 {
00088 assert(rtsg < RTSG_END);
00089
00090 if (rti->group[rtsg] == NULL) return 0;
00091
00092 const SpriteGroup *group;
00093 ResolverObject object;
00094
00095 NewRailTypeResolver(&object, tile, upper_halftile);
00096
00097 group = SpriteGroup::Resolve(rti->group[rtsg], &object);
00098 if (group == NULL || group->GetNumResults() == 0) return 0;
00099
00100 return group->GetResult();
00101 }
00102
00103 uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile)
00104 {
00105
00106 if (grffile->railtype_max == 0) return railtype;
00107
00108
00109 RailTypeLabel label = GetRailTypeInfo(railtype)->label;
00110 for (uint i = 0; i < grffile->railtype_max; i++) {
00111 if (label == grffile->railtype_list[i]) return i;
00112 }
00113
00114
00115 return 0xFF;
00116 }