tile.c
author tron
Mon, 07 Feb 2005 10:41:45 +0000
changeset 1335 a635854c23b6
parent 1213 bb9906f67932
child 1854 8e246ac3d172
permissions -rw-r--r--
(svn r1839) Move GetTileSlope() and GetTileZ() into tile.[ch] and use more explicit types as parameters
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bb9906f67932 (svn r1717) -Fix: some compilation problems for braindead VS6 and added missing files to project (thx bociusz)
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#include "stdafx.h"
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#include "tile.h"
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void SetMapExtraBits(TileIndex tile, byte bits)
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{
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	assert(tile < MapSize());
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	_map_extra_bits[tile >> 2] &= ~(3 << ((tile & 3) * 2));
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	_map_extra_bits[tile >> 2] |= (bits&3) << ((tile & 3) * 2);
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}
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uint GetMapExtraBits(TileIndex tile)
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{
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	assert(tile < MapSize());
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	return (_map_extra_bits[tile >> 2] >> (tile & 3) * 2) & 3;
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}
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uint GetTileSlope(TileIndex tile, uint *h)
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{
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	uint a;
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	uint b;
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	uint c;
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	uint d;
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	uint min;
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	uint r;
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	assert(tile < MapSize());
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	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
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		if (h != NULL) *h = 0;
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		return 0;
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	}
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	min = a = TileHeight(tile);
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	b = TileHeight(tile + TILE_XY(1,0));
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	if (min >= b) min = b;
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	c = TileHeight(tile + TILE_XY(0,1));
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	if (min >= c) min = c;
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	d = TileHeight(tile + TILE_XY(1,1));
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	if (min >= d) min = d;
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	r = 0;
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	if ((a -= min) != 0) { r += (--a << 4) + 8; }
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	if ((c -= min) != 0) { r += (--c << 4) + 4; }
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	if ((d -= min) != 0) { r += (--d << 4) + 2; }
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	if ((b -= min) != 0) { r += (--b << 4) + 1; }
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	if (h != NULL)
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		*h = min * 8;
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	return r;
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}
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uint GetTileZ(TileIndex tile)
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{
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	uint h;
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	GetTileSlope(tile, &h);
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	return h;
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}