tile.c
author bjarni
Tue, 06 Dec 2005 22:09:28 +0000
changeset 2722 d2ab10ffc5e7
parent 2549 5587f9a38563
child 3017 a75caf4efa2d
permissions -rw-r--r--
(svn r3267) -Codechange: [OSX] universal binary makefile code cleanup
now PPC code is always compiled before x86 code
strgen and lng files are only compiled once, which results in shorter building time
the makefile now assigns default values to undefined values so much less needs to be set up
the code is now easier to maintain
/* $Id$ */

#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;
}