Lookup table for tilemap tile connectivity

Tilecode LUT

// This LUT follows the following tile code:
//   1   2   4
//   8   X  16
//  32  64 128
static const int NUM_DIR = 8;
static const glm::ivec2 dir[NUM_DIR] = {
	{ -1, -1 },
	{ 0, -1 },
	{ 1, -1 },
	{ -1, 0 },
	{ 1, 0 },
	{ -1, 1 },
	{ 0, 1 },
	{ 1, 1 }
};

static const uint8_t tileIndex_LUT[] = {
	0,  1,  2,  2,  3,  4,  2,  2,  5,  5,  6,  6,  7,  7,  6,  6,
	8,  9, 10, 10,  8,  9, 10, 10, 11, 11, 12, 12, 11, 11, 12, 12,
	13, 14, 15, 15, 16, 17, 15, 15,  5,  5,  6,  6,  7,  7,  6,  6,
	18, 19, 20, 20, 18, 19, 20, 20, 11, 11, 12, 12, 11, 11, 12, 12,
	21, 22, 23, 23, 24, 25, 23, 23, 26, 26, 27, 27, 28, 28, 27, 27,
	29, 30, 31, 31, 29, 30, 31, 31, 32, 32, 33, 33, 32, 32, 33, 33,
	21, 22, 23, 23, 24, 25, 23, 23, 26, 26, 27, 27, 28, 28, 27, 27,
	29, 30, 31, 31, 29, 30, 31, 31, 32, 32, 33, 33, 32, 32, 33, 33,
	34, 35, 36, 36, 37, 38, 36, 36, 39, 39, 40, 40, 41, 41, 40, 40,
	8,  9, 10, 10,  8,  9, 10, 10, 11, 11, 12, 12, 11, 11, 12, 12,
	42, 43, 44, 44, 45, 46, 44, 44, 39, 39, 40, 40, 41, 41, 40, 40,
	18, 19, 20, 20, 18, 19, 20, 20, 11, 11, 12, 12, 11, 11, 12, 12,
	21, 22, 23, 23, 24, 25, 23, 23, 26, 26, 27, 27, 28, 28, 27, 27,
	29, 30, 31, 31, 29, 30, 31, 31, 32, 32, 33, 33, 32, 32, 33, 33,
	21, 22, 23, 23, 24, 25, 23, 23, 26, 26, 27, 27, 28, 28, 27, 27,
	29, 30, 31, 31, 29, 30, 31, 31, 32, 32, 33, 33, 32, 32, 33, 33
};