/* $Id$ */ /* * 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 terraform_cmd.cpp Commands related to terraforming. */ #include "stdafx.h" #include "openttd.h" #include "command_func.h" #include "tunnel_map.h" #include "bridge_map.h" #include "variables.h" #include "functions.h" #include "economy_func.h" #include "table/strings.h" /* * In one terraforming command all four corners of a initial tile can be raised/lowered (though this is not available to the player). * The maximal amount of height modifications is archieved when raising a complete flat land from sea level to MAX_TILE_HEIGHT or vice versa. * This affects all corners with a manhatten distance smaller than MAX_TILE_HEIGHT to one of the initial 4 corners. * Their maximal amount is computed to 4 * \sum_{i=1}^{h_max} i = 2 * h_max * (h_max + 1). */ static const int TERRAFORMER_MODHEIGHT_SIZE = 2 * MAX_TILE_HEIGHT * (MAX_TILE_HEIGHT + 1); /* * The maximal amount of affected tiles (i.e. the tiles that incident with one of the corners above, is computed similiar to * 1 + 4 * \sum_{i=1}^{h_max} (i+1) = 1 + 2 * h_max + (h_max + 3). */ static const int TERRAFORMER_TILE_TABLE_SIZE = 1 + 2 * MAX_TILE_HEIGHT * (MAX_TILE_HEIGHT + 3); struct TerraformerHeightMod { TileIndex tile; ///< Referenced tile. byte height; ///< New TileHeight (height of north corner) of the tile. }; struct TerraformerState { int modheight_count; ///< amount of entries in "modheight". int tile_table_count; ///< amount of entries in "tile_table". /** * Dirty tiles, i.e.\ at least one corner changed. * * This array contains the tiles which are or will be marked as dirty. * * @ingroup dirty */ TileIndex tile_table[TERRAFORMER_TILE_TABLE_SIZE]; TerraformerHeightMod modheight[TERRAFORMER_MODHEIGHT_SIZE]; ///< Height modifications. }; TileIndex _terraform_err_tile; ///< first tile we couldn't terraform /** * Gets the TileHeight (height of north corner) of a tile as of current terraforming progress. * * @param ts TerraformerState. * @param tile Tile. * @return TileHeight. */ static int TerraformGetHeightOfTile(const TerraformerState *ts, TileIndex tile) { const TerraformerHeightMod *mod = ts->modheight; for (int count = ts->modheight_count; count != 0; count--, mod++) { if (mod->tile == tile) return mod->height; } /* TileHeight unchanged so far, read value from map. */ return TileHeight(tile); } /** * Stores the TileHeight (height of north corner) of a tile in a TerraformerState. * * @param ts TerraformerState. * @param tile Tile. * @param height New TileHeight. */ static void TerraformSetHeightOfTile(TerraformerState *ts, TileIndex tile, int height) { /* Find tile in the "modheight" table. * Note: In a normal user-terraform command the tile will not be found in the "modheight" table. * But during house- or industry-construction multiple corners can be terraformed at once. */ TerraformerHeightMod *mod = ts->modheight; int count = ts->modheight_count; while ((count > 0) && (mod->tile != tile)) { mod++; count--; } /* New entry? */ if (count == 0) { assert(ts->modheight_count < TERRAFORMER_MODHEIGHT_SIZE); ts->modheight_count++; } /* Finally store the new value */ mod->tile = tile; mod->height = (byte)height; } /** * Adds a tile to the "tile_table" in a TerraformerState. * * @param ts TerraformerState. * @param tile Tile. * @ingroup dirty */ static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile) { int count = ts->tile_table_count; for (TileIndex *t = ts->tile_table; count != 0; count--, t++) { if (*t == tile) return; } assert(ts->tile_table_count < TERRAFORMER_TILE_TABLE_SIZE); ts->tile_table[ts->tile_table_count++] = tile; } /** * Adds all tiles that incident with the north corner of a specific tile to the "tile_table" in a TerraformerState. * * @param ts TerraformerState. * @param tile Tile. * @ingroup dirty */ static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile) { /* Make sure all tiles passed to TerraformAddDirtyTile are within [0, MapSize()] */ if (TileY(tile) >= 1) TerraformAddDirtyTile(ts, tile + TileDiffXY( 0, -1)); if (TileY(tile) >= 1 && TileX(tile) >= 1) TerraformAddDirtyTile(ts, tile + TileDiffXY(-1, -1)); if (TileX(tile) >= 1) TerraformAddDirtyTile(ts, tile + TileDiffXY(-1, 0)); TerraformAddDirtyTile(ts, tile); } /** * Terraform the north corner of a tile to a specific height. * * @param ts TerraformerState. * @param tile Tile. * @param height Aimed height. * @return Error code or cost. */ static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int height) { assert(tile < MapSize()); /* Check range of destination height */ if (height < 0) return_cmd_error(STR_ERROR_ALREADY_AT_SEA_LEVEL); if (height > MAX_TILE_HEIGHT) return_cmd_error(STR_ERROR_TOO_HIGH); /* * Check if the terraforming has any effect. * This can only be true, if multiple corners of the start-tile are terraformed (i.e. the terraforming is done by towns/industries etc.). * In this case the terraforming should fail. (Don't know why.) */ if (height == TerraformGetHeightOfTile(ts, tile)) return CMD_ERROR; /* Check "too close to edge of map". Only possible when freeform-edges is off. */ uint x = TileX(tile); uint y = TileY(tile); if (!_settings_game.construction.freeform_edges && ((x <= 1) || (y <= 1) || (x >= MapMaxX() - 1) || (y >= MapMaxY() - 1))) { /* * Determine a sensible error tile */ if (x == 1) x = 0; if (y == 1) y = 0; _terraform_err_tile = TileXY(x, y); return_cmd_error(STR_ERROR_TOO_CLOSE_TO_EDGE_OF_MAP); } /* Mark incident tiles, that are involved in the terraforming */ TerraformAddDirtyTileAround(ts, tile); /* Store the height modification */ TerraformSetHeightOfTile(ts, tile, height); CommandCost total_cost(EXPENSES_CONSTRUCTION); /* Increment cost */ total_cost.AddCost(_price[PR_TERRAFORM]); /* Recurse to neighboured corners if height difference is larger than 1 */ { const TileIndexDiffC *ttm; TileIndex orig_tile = tile; static const TileIndexDiffC _terraform_tilepos[] = { { 1, 0}, // move to tile in SE {-2, 0}, // undo last move, and move to tile in NW { 1, 1}, // undo last move, and move to tile in SW { 0, -2} // undo last move, and move to tile in NE }; for (ttm = _terraform_tilepos; ttm != endof(_terraform_tilepos); ttm++) { tile += ToTileIndexDiff(*ttm); if (tile >= MapSize()) continue; /* Make sure we don't wrap around the map */ if (Delta(TileX(orig_tile), TileX(tile)) == MapSizeX() - 1) continue; if (Delta(TileY(orig_tile), TileY(tile)) == MapSizeY() - 1) continue; /* Get TileHeight of neighboured tile as of current terraform progress */ int r = TerraformGetHeightOfTile(ts, tile); int height_diff = height - r; /* Is the height difference to the neighboured corner greater than 1? */ if (abs(height_diff) > 1) { /* Terraform the neighboured corner. The resulting height difference should be 1. */ height_diff += (height_diff < 0 ? 1 : -1); CommandCost cost = TerraformTileHeight(ts, tile, r + height_diff); if (cost.Failed()) return cost; total_cost.AddCost(cost); } } } return total_cost; } /** Terraform land * @param tile tile to terraform * @param flags for this command type * @param p1 corners to terraform (SLOPE_xxx) * @param p2 direction; eg up (non-zero) or down (zero) * @param text unused * @return the cost of this operation or an error */ CommandCost CmdTerraformLand(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text) { _terraform_err_tile = INVALID_TILE; CommandCost total_cost(EXPENSES_CONSTRUCTION); int direction = (p2 != 0 ? 1 : -1); TerraformerState ts; ts.modheight_count = ts.tile_table_count = 0; /* Compute the costs and the terraforming result in a model of the landscape */ if ((p1 & SLOPE_W) != 0 && tile + TileDiffXY(1, 0) < MapSize()) { TileIndex t = tile + TileDiffXY(1, 0); CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction); if (cost.Failed()) return cost; total_cost.AddCost(cost); } if ((p1 & SLOPE_S) != 0 && tile + TileDiffXY(1, 1) < MapSize()) { TileIndex t = tile + TileDiffXY(1, 1); CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction); if (cost.Failed()) return cost; total_cost.AddCost(cost); } if ((p1 & SLOPE_E) != 0 && tile + TileDiffXY(0, 1) < MapSize()) { TileIndex t = tile + TileDiffXY(0, 1); CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction); if (cost.Failed()) return cost; total_cost.AddCost(cost); } if ((p1 & SLOPE_N) != 0) { TileIndex t = tile + TileDiffXY(0, 0); CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction); if (cost.Failed()) return cost; total_cost.AddCost(cost); } /* Check if the terraforming is valid wrt. tunnels, bridges and objects on the surface */ { TileIndex *ti = ts.tile_table; for (int count = ts.tile_table_count; count != 0; count--, ti++) { TileIndex tile = *ti; assert(tile < MapSize()); /* MP_VOID tiles can be terraformed but as tunnels and bridges * cannot go under / over these tiles they don't need checking. */ if (IsTileType(tile, MP_VOID)) continue; /* Find new heights of tile corners */ uint z_N = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 0)); uint z_W = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 0)); uint z_S = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 1)); uint z_E = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 1)); /* Find min and max height of tile */ uint z_min = min(min(z_N, z_W), min(z_S, z_E)); uint z_max = max(max(z_N, z_W), max(z_S, z_E)); /* Compute tile slope */ Slope tileh = (z_max > z_min + 1 ? SLOPE_STEEP : SLOPE_FLAT); if (z_W > z_min) tileh |= SLOPE_W; if (z_S > z_min) tileh |= SLOPE_S; if (z_E > z_min) tileh |= SLOPE_E; if (z_N > z_min) tileh |= SLOPE_N; /* Check if bridge would take damage */ if (direction == 1 && MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && GetBridgeHeight(GetSouthernBridgeEnd(tile)) <= z_max * TILE_HEIGHT) { _terraform_err_tile = tile; // highlight the tile under the bridge return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST); } /* Check if tunnel would take damage */ if (direction == -1 && IsTunnelInWay(tile, z_min * TILE_HEIGHT)) { _terraform_err_tile = tile; // highlight the tile above the tunnel return_cmd_error(STR_ERROR_EXCAVATION_WOULD_DAMAGE); } /* Check tiletype-specific things, and add extra-cost */ const bool curr_gen = _generating_world; if (_game_mode == GM_EDITOR) _generating_world = true; // used to create green terraformed land CommandCost cost = _tile_type_procs[GetTileType(tile)]->terraform_tile_proc(tile, flags | DC_AUTO, z_min * TILE_HEIGHT, tileh); _generating_world = curr_gen; if (cost.Failed()) { _terraform_err_tile = tile; return cost; } total_cost.AddCost(cost); } } if (flags & DC_EXEC) { /* change the height */ { int count; TerraformerHeightMod *mod; mod = ts.modheight; for (count = ts.modheight_count; count != 0; count--, mod++) { TileIndex til = mod->tile; SetTileHeight(til, mod->height); } } /* finally mark the dirty tiles dirty */ { int count; TileIndex *ti = ts.tile_table; for (count = ts.tile_table_count; count != 0; count--, ti++) { MarkTileDirtyByTile(*ti); } } } return total_cost; } /** Levels a selected (rectangle) area of land * @param tile end tile of area-drag * @param flags for this command type * @param p1 start tile of area drag * @param p2 height difference; eg raise (+1), lower (-1) or level (0) * @param text unused * @return the cost of this operation or an error */ CommandCost CmdLevelLand(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text) { if (p1 >= MapSize()) return CMD_ERROR; _terraform_err_tile = INVALID_TILE; /* remember level height */ uint oldh = TileHeight(p1); /* compute new height */ uint h = oldh + p2; /* Check range of destination height */ if (h > MAX_TILE_HEIGHT) return_cmd_error((oldh == 0) ? STR_ERROR_ALREADY_AT_SEA_LEVEL : STR_ERROR_TOO_HIGH); Money money = GetAvailableMoneyForCommand(); CommandCost cost(EXPENSES_CONSTRUCTION); TileArea ta(tile, p1); TILE_AREA_LOOP(tile, ta) { uint curh = TileHeight(tile); while (curh != h) { CommandCost ret = DoCommand(tile, SLOPE_N, (curh > h) ? 0 : 1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND); if (ret.Failed()) break; if (flags & DC_EXEC) { money -= ret.GetCost(); if (money < 0) { _additional_cash_required = ret.GetCost(); return cost; } DoCommand(tile, SLOPE_N, (curh > h) ? 0 : 1, flags, CMD_TERRAFORM_LAND); } cost.AddCost(ret); curh += (curh > h) ? -1 : 1; } } if (cost.GetCost() == 0) { if (p2 != 0) return CMD_ERROR; cost.MakeError(STR_ERROR_ALREADY_LEVELLED); cost.SetGlobalErrorMessage(); } return cost; }