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(svn r5199) Make the control flow of GetTileTrackStatus_TunnelBridge() more comprehensible

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tron 2006-06-09 15:27:17 +00:00
parent c1bcead499
commit 901e2d02b1
1 changed files with 9 additions and 24 deletions
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33
tunnelbridge_cmd.c
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@ -1241,41 +1241,26 @@ static void ClickTile_TunnelBridge(TileIndex tile)
static uint32 GetTileTrackStatus_TunnelBridge(TileIndex tile, TransportType mode)
{
uint32 result;
if (IsTunnel(tile)) {
if (GetTunnelTransportType(tile) == mode) {
return DiagDirToAxis(GetTunnelDirection(tile)) == AXIS_X ? 0x101 : 0x202;
}
} else if (IsBridge(tile)) { // XXX is this necessary?
if (GetTunnelTransportType(tile) != mode) return 0;
return (DiagDirToAxis(GetTunnelDirection(tile)) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y) * 0x101;
} else {
if (IsBridgeRamp(tile)) {
if (GetBridgeTransportType(tile) != mode) return 0;
return (DiagDirToAxis(GetBridgeRampDirection(tile)) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y) * 0x101;
} else {
result = 0;
uint32 result = 0;
if (GetBridgeTransportType(tile) == mode) {
result = (GetBridgeAxis(tile) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y) * 0x101;
}
if (IsTransportUnderBridge(tile)) {
if (GetTransportTypeUnderBridge(tile) != mode) return result;
} else {
if (IsClearUnderBridge(tile)) {
return result;
} else {
if (mode != TRANSPORT_WATER) return result;
}
if ((IsTransportUnderBridge(tile) && mode == GetTransportTypeUnderBridge(tile)) ||
(IsWaterUnderBridge(tile) && mode == TRANSPORT_WATER)) {
result |= (GetBridgeAxis(tile) == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) * 0x101;
}
/* If we've not returned yet, there is a compatible
* transport or water beneath, so we can add it to
* result */
/* Why is this xor'd ? Can't it just be or'd? */
result ^= (GetBridgeAxis(tile) == AXIS_X ? 0x202 : 0x101);
return result;
}
return result;
} else {
assert(0); /* This should never occur */
}
return 0;
}
static void ChangeTileOwner_TunnelBridge(TileIndex tile, PlayerID old_player, PlayerID new_player)