/* $Id$ */ /* * This file is part of OpenTTD. * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. */ /** @file newgrf_canal.cpp Implementation of NewGRF canals. */ #include "stdafx.h" #include "debug.h" #include "newgrf_spritegroup.h" #include "newgrf_canal.h" #include "water.h" #include "water_map.h" #include "safeguards.h" /** Table of canal 'feature' sprite groups */ WaterFeature _water_feature[CF_END]; /** Scope resolver of a canal tile. */ struct CanalScopeResolver : public ScopeResolver { TileIndex tile; ///< Tile containing the canal. CanalScopeResolver(ResolverObject &ro, TileIndex tile); /* virtual */ uint32 GetRandomBits() const; /* virtual */ uint32 GetVariable(byte variable, uint32 parameter, bool *available) const; }; /** Resolver object for canals. */ struct CanalResolverObject : public ResolverObject { CanalScopeResolver canal_scope; CanalResolverObject(CanalFeature feature, TileIndex tile, CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0); /* virtual */ ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) { switch (scope) { case VSG_SCOPE_SELF: return &this->canal_scope; default: return ResolverObject::GetScope(scope, relative); } } /* virtual */ const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const; }; /* virtual */ uint32 CanalScopeResolver::GetRandomBits() const { /* Return random bits only for water tiles, not station tiles */ return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0; } /* virtual */ uint32 CanalScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const { switch (variable) { /* Height of tile */ case 0x80: { int z = GetTileZ(this->tile); /* Return consistent height within locks */ if (IsTileType(this->tile, MP_WATER) && IsLock(this->tile) && GetLockPart(this->tile) == LOCK_PART_UPPER) z--; return z; } /* Terrain type */ case 0x81: return GetTerrainType(this->tile); /* Dike map: Connectivity info for river and canal tiles * * Assignment of bits to directions defined in agreement with * http://projects.tt-forums.net/projects/ttdpatch/repository/revisions/2367/entry/trunk/patches/water.asm#L879 * 7 * 3 0 * 6 * 4 * 2 1 * 5 */ case 0x82: { uint32 connectivity = (!IsWateredTile(TILE_ADDXY(tile, -1, 0), DIR_SW) << 0) // NE + (!IsWateredTile(TILE_ADDXY(tile, 0, 1), DIR_NW) << 1) // SE + (!IsWateredTile(TILE_ADDXY(tile, 1, 0), DIR_NE) << 2) // SW + (!IsWateredTile(TILE_ADDXY(tile, 0, -1), DIR_SE) << 3) // NW + (!IsWateredTile(TILE_ADDXY(tile, -1, 1), DIR_W) << 4) // E + (!IsWateredTile(TILE_ADDXY(tile, 1, 1), DIR_N) << 5) // S + (!IsWateredTile(TILE_ADDXY(tile, 1, -1), DIR_E) << 6) // W + (!IsWateredTile(TILE_ADDXY(tile, -1, -1), DIR_S) << 7); // N return connectivity; } /* Random data for river or canal tiles, otherwise zero */ case 0x83: return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0; } DEBUG(grf, 1, "Unhandled canal variable 0x%02X", variable); *available = false; return UINT_MAX; } /* virtual */ const SpriteGroup *CanalResolverObject::ResolveReal(const RealSpriteGroup *group) const { if (group->num_loaded == 0) return NULL; return group->loaded[0]; } CanalScopeResolver::CanalScopeResolver(ResolverObject &ro, TileIndex tile) : ScopeResolver(ro) { this->tile = tile; } /** * Canal resolver constructor. * @param feature Which canal feature we want. * @param tile Tile index of canal. * @param callback Callback ID. * @param callback_param1 First parameter (var 10) of the callback. * @param callback_param2 Second parameter (var 18) of the callback. */ CanalResolverObject::CanalResolverObject(CanalFeature feature, TileIndex tile, CallbackID callback, uint32 callback_param1, uint32 callback_param2) : ResolverObject(_water_feature[feature].grffile, callback, callback_param1, callback_param2), canal_scope(*this, tile) { this->root_spritegroup = _water_feature[feature].group; } /** * Lookup the base sprite to use for a canal. * @param feature Which canal feature we want. * @param tile Tile index of canal, if appropriate. * @return Base sprite returned by GRF, or \c 0 if none. */ SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile) { CanalResolverObject object(feature, tile); const SpriteGroup *group = object.Resolve(); if (group == NULL) return 0; return group->GetResult(); } /** * Run a specific callback for canals. * @param callback Callback ID. * @param param1 Callback parameter 1. * @param param2 Callback parameter 2. * @param feature For which feature to run the callback. * @param tile Tile index of canal. * @return Callback result or #CALLBACK_FAILED if the callback failed. */ static uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile) { CanalResolverObject object(feature, tile, callback, param1, param2); return object.ResolveCallback(); } /** * Get the new sprite offset for a water tile. * @param tile Tile index of the canal/water tile. * @param feature For which feature to get the new sprite offset. * @param cur_offset Current sprite offset. * @return New sprite offset. */ uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset) { if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) { uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile); if (cb != CALLBACK_FAILED) return cur_offset + cb; } return cur_offset; }