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@ -101,10 +101,13 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
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static const TrackBits safe_track[] = { TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER, TRACK_BIT_RIGHT };
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static const Slope unsafe_slope[] = { SLOPE_S, SLOPE_W, SLOPE_N, SLOPE_E };
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Slope tileh;
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uint z;
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// Nothing could be built at the steep slope - this avoids a bug
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// when you have a single diagonal track in one corner on a
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// basement and then you raise/lower the other corner.
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Slope tileh = GetTileSlope(tile, NULL);
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tileh = GetTileSlope(tile, &z);
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if (tileh == unsafe_slope[mode] ||
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tileh == ComplementSlope(unsafe_slope[mode])) {
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_terraform_err_tile = tile;
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@ -115,6 +118,18 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
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// If we have a single diagonal track there, the other side of
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// tile can be terraformed.
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if (IsPlainRailTile(tile) && GetTrackBits(tile) == safe_track[mode]) {
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/* If terraforming downwards prevent damaging a potential tunnel below.
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* This check is only necessary for flat tiles, because if the tile is
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* non-flat, then the corner opposing the rail is raised. Only this corner
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* can be lowered and this is a safe action
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*/
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if (tileh == SLOPE_FLAT &&
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ts->direction == -1 &&
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IsTunnelInWay(tile, z - TILE_HEIGHT)) {
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_terraform_err_tile = tile;
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_error_message = STR_1002_EXCAVATION_WOULD_DAMAGE;
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return -1;
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}
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return 0;
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}
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}
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