mirror of https://github.com/OpenTTD/OpenTTD.git
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
#include "stdafx.h"
|
|
#include "tile.h"
|
|
|
|
void SetMapExtraBits(TileIndex tile, byte bits)
|
|
{
|
|
assert(tile < MapSize());
|
|
SB(_map_extra_bits[tile >> 2], (tile & 3) * 2, 2, bits & 3);
|
|
}
|
|
|
|
uint GetMapExtraBits(TileIndex tile)
|
|
{
|
|
assert(tile < MapSize());
|
|
return GB(_map_extra_bits[tile >> 2], (tile & 3) * 2, 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 + TILE_XY(1,0));
|
|
if (min >= b) min = b;
|
|
c = TileHeight(tile + TILE_XY(0,1));
|
|
if (min >= c) min = c;
|
|
d = TileHeight(tile + TILE_XY(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;
|
|
}
|