mirror of https://github.com/OpenTTD/OpenTTD
(svn r21138) -Codechange: Introduce the concepts of frame and position in the tunnel / bridge entering code (Hirundo)
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@ -1502,6 +1502,10 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
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const DiagDirection dir = GetTunnelBridgeDirection(tile);
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/* Direction of the vehicle */
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const DiagDirection vdir = DirToDiagDir(v->direction);
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/* New position of the vehicle on the tile */
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byte pos = (DiagDirToAxis(vdir) == AXIS_X ? x : y) & TILE_UNIT_MASK;
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/* Number of units moved by the vehicle since entering the tile */
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byte frame = (vdir == DIAGDIR_NE || vdir == DIAGDIR_NW) ? TILE_SIZE - 1 - pos : pos;
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if (IsTunnel(tile)) {
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byte fc = (x & 0xF) + (y << 4);
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