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: return GetTileZ(tile) / TILE_HEIGHT;
00051
00052
00053 case 0x81: return GetTerrainType(tile);
00054
00055
00056 case 0x83: return GetWaterTileRandomBits(tile);
00057 }
00058
00059 DEBUG(grf, 1, "Unhandled canal variable 0x%02X", variable);
00060
00061 *available = false;
00062 return UINT_MAX;
00063 }
00064
00065
00066 static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
00067 {
00068 if (group->num_loaded == 0) return NULL;
00069
00070 return group->loaded[0];
00071 }
00072
00073
00074 static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
00075 {
00076 res->GetRandomBits = &CanalGetRandomBits;
00077 res->GetTriggers = &CanalGetTriggers;
00078 res->SetTriggers = &CanalSetTriggers;
00079 res->GetVariable = &CanalGetVariable;
00080 res->ResolveReal = &CanalResolveReal;
00081
00082 res->u.canal.tile = tile;
00083
00084 res->callback = CBID_NO_CALLBACK;
00085 res->callback_param1 = 0;
00086 res->callback_param2 = 0;
00087 res->last_value = 0;
00088 res->trigger = 0;
00089 res->reseed = 0;
00090 res->count = 0;
00091 res->grffile = grffile;
00092 }
00093
00094
00095 SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
00096 {
00097 ResolverObject object;
00098 const SpriteGroup *group;
00099
00100 NewCanalResolver(&object, tile, _water_feature[feature].grffile);
00101
00102 group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
00103 if (group == NULL) return 0;
00104
00105 return group->GetResult();
00106 }
00107
00117 static uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
00118 {
00119 ResolverObject object;
00120 const SpriteGroup *group;
00121
00122 NewCanalResolver(&object, tile, _water_feature[feature].grffile);
00123
00124 object.callback = callback;
00125 object.callback_param1 = param1;
00126 object.callback_param2 = param2;
00127
00128 group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
00129 if (group == NULL) return CALLBACK_FAILED;
00130
00131 return group->GetCallbackResult();
00132 }
00133
00141 uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset)
00142 {
00143 if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) {
00144 uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile);
00145 if (cb != CALLBACK_FAILED) return cur_offset + cb;
00146 }
00147 return cur_offset;
00148 }