newgrf_canal.cpp
Go to the documentation of this file.00001
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00012 #include "stdafx.h"
00013 #include "debug.h"
00014 #include "newgrf_spritegroup.h"
00015 #include "newgrf_canal.h"
00016 #include "water_map.h"
00017
00018
00020 WaterFeature _water_feature[CF_END];
00021
00022
00023
00024
00025 static uint32 CanalGetRandomBits(const ResolverObject *object)
00026 {
00027
00028 return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
00029 }
00030
00031
00032 static uint32 CanalGetTriggers(const ResolverObject *object)
00033 {
00034 return 0;
00035 }
00036
00037
00038 static void CanalSetTriggers(const ResolverObject *object, int triggers)
00039 {
00040 return;
00041 }
00042
00043
00044 static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00045 {
00046 TileIndex tile = object->u.canal.tile;
00047
00048 switch (variable) {
00049
00050 case 0x80: {
00051 uint z = GetTileZ(tile) / TILE_HEIGHT;
00052
00053 if (IsTileType(tile, MP_WATER) && IsLock(tile) && GetSection(tile) == LOCK_UPPER) z--;
00054 return z;
00055 }
00056
00057
00058 case 0x81: return GetTerrainType(tile);
00059
00060
00061 case 0x83: return IsTileType(tile, MP_WATER) ? GetWaterTileRandomBits(tile) : 0;
00062 }
00063
00064 DEBUG(grf, 1, "Unhandled canal variable 0x%02X", variable);
00065
00066 *available = false;
00067 return UINT_MAX;
00068 }
00069
00070
00071 static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
00072 {
00073 if (group->num_loaded == 0) return NULL;
00074
00075 return group->loaded[0];
00076 }
00077
00078
00079 static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
00080 {
00081 res->GetRandomBits = &CanalGetRandomBits;
00082 res->GetTriggers = &CanalGetTriggers;
00083 res->SetTriggers = &CanalSetTriggers;
00084 res->GetVariable = &CanalGetVariable;
00085 res->ResolveReal = &CanalResolveReal;
00086
00087 res->u.canal.tile = tile;
00088
00089 res->callback = CBID_NO_CALLBACK;
00090 res->callback_param1 = 0;
00091 res->callback_param2 = 0;
00092 res->last_value = 0;
00093 res->trigger = 0;
00094 res->reseed = 0;
00095 res->count = 0;
00096 res->grffile = grffile;
00097 }
00098
00099
00100 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
00101 {
00102 ResolverObject object;
00103 const SpriteGroup *group;
00104
00105 NewCanalResolver(&object, tile, _water_feature[feature].grffile);
00106
00107 group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
00108 if (group == NULL) return 0;
00109
00110 return group->GetResult();
00111 }
00112
00122 static uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
00123 {
00124 ResolverObject object;
00125 const SpriteGroup *group;
00126
00127 NewCanalResolver(&object, tile, _water_feature[feature].grffile);
00128
00129 object.callback = callback;
00130 object.callback_param1 = param1;
00131 object.callback_param2 = param2;
00132
00133 group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
00134 if (group == NULL) return CALLBACK_FAILED;
00135
00136 return group->GetCallbackResult();
00137 }
00138
00146 uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset)
00147 {
00148 if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) {
00149 uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile);
00150 if (cb != CALLBACK_FAILED) return cur_offset + cb;
00151 }
00152 return cur_offset;
00153 }