(svn r3136) -Fix: [autoreplace] all cargo in engines that consists of more than one vehicle will try to move cargo from all vehicles
currently this applies to planes and multiheaded train engines (no more lost airmail)
added GetNextEnginePart() that returns the next vehicle in an engine nomatter what type it is
when more types of multivehicle engines are added, they will have to be added here too or autoreplace will not remove all cargo
/* $Id$ */
#include "stdafx.h"
#include "tile.h"
void SetMapExtraBits(TileIndex tile, byte bits)
{
assert(tile < MapSize());
SB(_m[tile].extra, 0, 2, bits & 3);
}
uint GetMapExtraBits(TileIndex tile)
{
assert(tile < MapSize());
return GB(_m[tile].extra, 0, 2);
}
uint GetTileSlope(TileIndex tile, uint *h)
{
uint a;
uint b;
uint c;
uint d;
uint min;
uint r;
assert(tile < MapSize());
if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
if (h != NULL) *h = 0;
return 0;
}
min = a = TileHeight(tile);
b = TileHeight(tile + TileDiffXY(1, 0));
if (min >= b) min = b;
c = TileHeight(tile + TileDiffXY(0, 1));
if (min >= c) min = c;
d = TileHeight(tile + TileDiffXY(1, 1));
if (min >= d) min = d;
r = 0;
if ((a -= min) != 0) r += (--a << 4) + 8;
if ((c -= min) != 0) r += (--c << 4) + 4;
if ((d -= min) != 0) r += (--d << 4) + 2;
if ((b -= min) != 0) r += (--b << 4) + 1;
if (h != NULL)
*h = min * 8;
return r;
}
uint GetTileZ(TileIndex tile)
{
uint h;
GetTileSlope(tile, &h);
return h;
}