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/* $Id$ */

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/* Rail selection types (directions):

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 / \    / \    / \    / \   / \   / \

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/  /\  /\  \  /===\  /   \ /|  \ /  |\

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\/  /  \  \/  \   /  \===/ \|  / \  |/

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 \ /    \ /    \ /    \ /   \ /   \ /

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  0      1      2      3     4     5

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*/

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// mark invalid tiles red

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#define RED(c) c | PALETTE_SEL_TILE_RED

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// table maps each of the six rail directions and tileh combinations to a sprite

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// invalid entries are required to make sure that this array can be quickly accessed

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static const int _AutorailTilehSprite[][6] = {

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// type   0        1        2        3        4        5

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	{       0,       8,      16,      25,      34,      42 }, // tileh = 0

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	{       5,      13, RED(22), RED(31),      35,      42 }, // tileh = 1

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	{       5,      10,      16,      26, RED(38), RED(46) }, // tileh = 2

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	{       5,       9, RED(23),      26,      35, RED(46) }, // tileh = 3

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	{       2,      10, RED(19), RED(28),      34,      43 }, // tileh = 4

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 5

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	{       1,      10, RED(20),      26, RED(38),      43 }, // tileh = 6

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 7

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	{       2,      13,      17,      25, RED(40), RED(48) }, // tileh = 8

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	{       1,      13,      17, RED(32),      35, RED(48) }, // tileh = 9

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 10

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 11

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	{       2,       9,      17, RED(29), RED(40),      43 }, // tileh = 12

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 13

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	{       1,       9,      17,      26,      35,      43 }, // tileh = 14

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	{       0,       1,       2,       3,       4,       5 }, // invalid (15)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (16)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (17)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (18)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (19)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (20)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (21)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (22)

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	{       6,      11,      17,      27, RED(39), RED(47) }, // tileh = 23

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	{       0,       1,       2,       3,       4,       5 }, // invalid (24)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (25)

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	{       0,       1,       2,       3,       4,       5 }, // invalid (26)

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	{       7,      15, RED(24), RED(33),      36,      44 }, // tileh = 27

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	{       0,       1,       2,       3,       4,       5 }, // invalid (28)

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	{       3,      14,      18,      26, RED(41), RED(49) }, // tileh = 29

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	{       4,      12, RED(21), RED(30),      37,      45 }  // tileh = 30

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};

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#undef RED

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// maps each pixel of a tile (16x16) to a selection type

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// (0,0) is the top corner, (16,16) the bottom corner

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static const byte _AutorailPiece[][16] = {

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5 },

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	{ 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1 },

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	{ 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1 },

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	{ 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 },

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	{ 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 },

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	{ 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3 }

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};