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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "bridge_map.h"

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#include "variables.h"

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TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)

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{

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	TileIndexDiff delta = TileOffsByDir(dir);

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	do { tile += delta; } while (IsBridgeAbove(tile) && IsBridgeOfAxis(tile, DiagDirToAxis(dir)));

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	return tile;

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}

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TileIndex GetNorthernBridgeEnd(TileIndex t)

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{

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	return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));

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}

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TileIndex GetSouthernBridgeEnd(TileIndex t)

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{

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	return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));

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}

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TileIndex GetOtherBridgeEnd(TileIndex tile)

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{

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	assert(IsBridgeTile(tile));

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	return GetBridgeEnd(tile, GetBridgeRampDirection(tile));

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}

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uint GetBridgeHeight(TileIndex tile, Axis a)

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{

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	uint h, f;

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	uint tileh = GetTileSlope(tile, &h);

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	f = GetBridgeFoundation(tileh, a);

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	if (f) {

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		if (f < 15) {

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			h += TILE_HEIGHT;

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			tileh = SLOPE_FLAT;

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		} else {

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			tileh = _inclined_tileh[f - 15];

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		}

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	}

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	return h + TILE_HEIGHT;

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}