(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
- New optional landscape generator (TerraGenesis Perlin)
- Load heightmaps (either BMP or PNG)
- Progress dialog while generating worlds (no longer a 'hanging' screen)
- New dialogs for NewGame, Create Scenario and Play Heightmap
- Easier to configure your landscape
- More things to configure (tree-placer, ..)
- Speedup of world generation
- New console command 'restart': restart the map EXACTLY as it was when you
first started it (needs a game made after or with this commit)
- New console command 'getseed': get the seed of your map and share it with
others (of course only works with generated maps)
- Many new, world generation related, things
- Many internal cleanups and rewrites
Many tnx to those people who helped making this:
Belugas, DaleStan, glx, KUDr, RichK67, Rubidium, and TrueLight (alfabetic)
Many tnx to those who helped testing:
Arnau, Bjarni, and tokai (alfabetic)
And to all other people who helped testing and sending comments / bugs
Stats: 673 lines changed, 3534 new lines, 79 new strings

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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "tile.h"

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#include "tunnel_map.h"

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TileIndex GetOtherTunnelEnd(TileIndex tile)

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{

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	DiagDirection dir = GetTunnelDirection(tile);

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	TileIndexDiff delta = TileOffsByDir(dir);

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	uint z = GetTileZ(tile);

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	dir = ReverseDiagDir(dir);

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	do {

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		tile += delta;

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	} while (

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		!IsTunnelTile(tile) ||

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		GetTunnelDirection(tile) != dir ||

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		GetTileZ(tile) != z

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	);

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	return tile;

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}

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static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)

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{

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	TileIndexDiff delta = TileOffsByDir(dir);

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	uint height;

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	do {

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		tile -= delta;

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		height = GetTileZ(tile);

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	} while (z < height);

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	return

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		z == height &&

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		IsTunnelTile(tile) &&

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		GetTunnelDirection(tile) == dir;

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}

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bool IsTunnelInWay(TileIndex tile, uint z)

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{

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	return

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		IsTunnelInWayDir(tile, z, DIAGDIR_NE) ||

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		IsTunnelInWayDir(tile, z, DIAGDIR_SE) ||

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		IsTunnelInWayDir(tile, z, DIAGDIR_SW) ||

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		IsTunnelInWayDir(tile, z, DIAGDIR_NW);

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}