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Location: cpp/openttd-patchpack/source/src/ai/api/ai_tunnel.cpp - annotation
r15577:a61e44bed2f3
4.2 KiB
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(svn r20247) -Fix: when it is known the loading an old savegame is going to fail, bail out immediately (using an exception) instead of going on until e.g. the expected number of byte is read
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/*
* 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 ai_tunnel.cpp Implementation of AITunnel. */
#include "ai_tunnel.hpp"
#include "ai_rail.hpp"
#include "../ai_instance.hpp"
#include "../../tunnel_map.h"
#include "../../command_func.h"
/* static */ bool AITunnel::IsTunnelTile(TileIndex tile)
{
if (!::IsValidTile(tile)) return false;
return ::IsTunnelTile(tile);
}
/* static */ TileIndex AITunnel::GetOtherTunnelEnd(TileIndex tile)
{
if (!::IsValidTile(tile)) return INVALID_TILE;
/* If it's a tunnel already, take the easy way out! */
if (IsTunnelTile(tile)) return ::GetOtherTunnelEnd(tile);
uint start_z;
Slope start_tileh = ::GetTileSlope(tile, &start_z);
DiagDirection direction = ::GetInclinedSlopeDirection(start_tileh);
if (direction == INVALID_DIAGDIR) return INVALID_TILE;
TileIndexDiff delta = ::TileOffsByDiagDir(direction);
uint end_z;
do {
tile += delta;
if (!::IsValidTile(tile)) return INVALID_TILE;
::GetTileSlope(tile, &end_z);
} while (start_z != end_z);
return tile;
}
static void _DoCommandReturnBuildTunnel2(class AIInstance *instance)
{
if (!AITunnel::_BuildTunnelRoad2()) {
AIInstance::DoCommandReturn(instance);
return;
}
/* This can never happen, as in test-mode this callback is never executed,
* and in execute-mode, the other callback is called. */
NOT_REACHED();
}
static void _DoCommandReturnBuildTunnel1(class AIInstance *instance)
{
if (!AITunnel::_BuildTunnelRoad1()) {
AIInstance::DoCommandReturn(instance);
return;
}
/* This can never happen, as in test-mode this callback is never executed,
* and in execute-mode, the other callback is called. */
NOT_REACHED();
}
/* static */ bool AITunnel::BuildTunnel(AIVehicle::VehicleType vehicle_type, TileIndex start)
{
EnforcePrecondition(false, ::IsValidTile(start));
EnforcePrecondition(false, vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_ROAD);
EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
uint type = 0;
if (vehicle_type == AIVehicle::VT_ROAD) {
type |= (TRANSPORT_ROAD << 8);
type |= ::RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType());
} else {
type |= (TRANSPORT_RAIL << 8);
type |= AIRail::GetCurrentRailType();
}
/* For rail we do nothing special */
if (vehicle_type == AIVehicle::VT_RAIL) {
return AIObject::DoCommand(start, type, 0, CMD_BUILD_TUNNEL);
}
AIObject::SetCallbackVariable(0, start);
return AIObject::DoCommand(start, type, 0, CMD_BUILD_TUNNEL, NULL, &_DoCommandReturnBuildTunnel1);
}
/* static */ bool AITunnel::_BuildTunnelRoad1()
{
/* Build the piece of road on the 'start' side of the tunnel */
TileIndex end = AIObject::GetCallbackVariable(0);
TileIndex start = AITunnel::GetOtherTunnelEnd(end);
DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
return AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildTunnel2);
}
/* static */ bool AITunnel::_BuildTunnelRoad2()
{
/* Build the piece of road on the 'end' side of the tunnel */
TileIndex end = AIObject::GetCallbackVariable(0);
TileIndex start = AITunnel::GetOtherTunnelEnd(end);
DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
}
/* static */ bool AITunnel::RemoveTunnel(TileIndex tile)
{
EnforcePrecondition(false, IsTunnelTile(tile));
return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
}
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