(svn r3475) - Fix: you couldn't remove an item from a list-type of config ingame from the configuration file. Whatever you did, upon restart of OpenTTD those items were still there. To fix this we initialize the first item to NULL in SaveList as it is rebuilt anyways fully.
/* $Id$ */
#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;
}