mirror of https://github.com/OpenTTD/OpenTTD.git
126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file ai_tunnel.cpp Implementation of AITunnel. */
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#include "ai_tunnel.hpp"
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#include "ai_rail.hpp"
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#include "../ai_instance.hpp"
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#include "../../tunnel_map.h"
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#include "../../command_func.h"
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/* static */ bool AITunnel::IsTunnelTile(TileIndex tile)
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{
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if (!::IsValidTile(tile)) return false;
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return ::IsTunnelTile(tile);
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}
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/* static */ TileIndex AITunnel::GetOtherTunnelEnd(TileIndex tile)
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{
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if (!::IsValidTile(tile)) return INVALID_TILE;
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/* If it's a tunnel already, take the easy way out! */
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if (IsTunnelTile(tile)) return ::GetOtherTunnelEnd(tile);
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uint start_z;
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Slope start_tileh = ::GetTileSlope(tile, &start_z);
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DiagDirection direction = ::GetInclinedSlopeDirection(start_tileh);
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if (direction == INVALID_DIAGDIR) return INVALID_TILE;
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TileIndexDiff delta = ::TileOffsByDiagDir(direction);
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uint end_z;
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do {
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tile += delta;
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if (!::IsValidTile(tile)) return INVALID_TILE;
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::GetTileSlope(tile, &end_z);
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} while (start_z != end_z);
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return tile;
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}
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static void _DoCommandReturnBuildTunnel2(class AIInstance *instance)
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{
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if (!AITunnel::_BuildTunnelRoad2()) {
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AIInstance::DoCommandReturn(instance);
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return;
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}
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/* This can never happen, as in test-mode this callback is never executed,
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* and in execute-mode, the other callback is called. */
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NOT_REACHED();
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}
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static void _DoCommandReturnBuildTunnel1(class AIInstance *instance)
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{
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if (!AITunnel::_BuildTunnelRoad1()) {
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AIInstance::DoCommandReturn(instance);
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return;
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}
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/* This can never happen, as in test-mode this callback is never executed,
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* and in execute-mode, the other callback is called. */
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NOT_REACHED();
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}
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/* static */ bool AITunnel::BuildTunnel(AIVehicle::VehicleType vehicle_type, TileIndex start)
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{
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EnforcePrecondition(false, ::IsValidTile(start));
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EnforcePrecondition(false, vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_ROAD);
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EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
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uint type = 0;
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if (vehicle_type == AIVehicle::VT_ROAD) {
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type |= (TRANSPORT_ROAD << 9);
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type |= ::RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType());
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} else {
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type |= (TRANSPORT_RAIL << 9);
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type |= AIRail::GetCurrentRailType();
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}
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/* For rail we do nothing special */
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if (vehicle_type == AIVehicle::VT_RAIL) {
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return AIObject::DoCommand(start, type, 0, CMD_BUILD_TUNNEL);
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}
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AIObject::SetCallbackVariable(0, start);
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return AIObject::DoCommand(start, type, 0, CMD_BUILD_TUNNEL, NULL, &_DoCommandReturnBuildTunnel1);
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}
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/* static */ bool AITunnel::_BuildTunnelRoad1()
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{
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/* Build the piece of road on the 'start' side of the tunnel */
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TileIndex end = AIObject::GetCallbackVariable(0);
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TileIndex start = AITunnel::GetOtherTunnelEnd(end);
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DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
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DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
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return AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildTunnel2);
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}
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/* static */ bool AITunnel::_BuildTunnelRoad2()
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{
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/* Build the piece of road on the 'end' side of the tunnel */
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TileIndex end = AIObject::GetCallbackVariable(0);
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TileIndex start = AITunnel::GetOtherTunnelEnd(end);
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DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
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DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
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return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
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}
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/* static */ bool AITunnel::RemoveTunnel(TileIndex tile)
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{
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EnforcePrecondition(false, IsTunnelTile(tile));
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return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
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}
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