const bar = [
    (f, t, a, b, c0, c1) => [].concat( // 0
        (f === 1) ? [a, 2, c1] : [],
        [a, 5, c0],
        [b, 5, c0],
        (t > 1) ? [b, 0, c0] : []
    ),

    (f, t, a, b, c0, c1) => [].concat( // 1
        (f === 0) ? [a, 5, c0] :
            (f > 1) ? [a, 0, c0] : [],
        [a, 2, c1],
        [b, 2, c1],
        (t > 1) ? [b, 0, c0] : []
    ),

    (f, t, a, b, c0, c1) => [a, 0, c0, b, 0, c1] // 2 = Z
];

const brick = [
    (f, t, a, b, c0, c1) => [].concat( // 0
        (f === 0) ? [a, 5, c0] :
            (f === 1) ? [a, 1, c1] : [],
        [a, 6, c0],
        (t === 0) ? [b, 5, c0] :
            [b, 4, c0],
        (t === 3) ? [b, 0, c0] : []
    ),
    (f, t, a, b, c0, c1) => [].concat( // 1
        (f === 0) ? [a, 4, c0, a, 3, c1] :
            (f === 1) ? [a, 2, c1] :
                (f === 2) ? [a, 3, c1] :
                    [a, 0, c0, a, 3, c1],
        (t === 1) ? [b, 3, c1] :
            [b, 1, c1],
        (t === 3) ? [b, 0, c0] : []
    ),
    (f, t, a, b, c0, c1) => [].concat( // 2
        (f === 0) ? [a, 4, 0] :
            (f === 1) ? [a, 1, 0] :
                [a, 0, 0],

        (t === 0) ? [b, 6, 0, b, 6, c0] :
            (t === 1) ? [b, 3, 0, b, 3, c1, b, 4, c0] :
                [b, 0, 0, b, 0, c0, b, 4, c0],

        (f === 0) ? [a, 4, c0, a, 3, c1] :
            (f === 1) ? [a, 6, c0, a, 1, c1] :
                [a, 6, c0, a, 0, c0, a, 3, c1],

        (t === 0) ? [b, 1, c1, b, 6, c0] :
            (t === 1) ? [b, 3, c1] :
                [b, 1, c1, b, 0, c0]
    )
];


// switch (val) {
//     case 0:
//         if (i === 0) {
//             if (y1 === y2) {
//                 vertices.push(
//                     t1, y1ShiftIndex, renderParam1.color, 0,
//                     t1, y1ShiftIndex, renderParam1.color, 4
//                 );
//             }
//         }

//         break;    
//     case 1: // 0 1
//         vertices.push(...bar[val](f[1], t[1], t1, t2, 2, 3));
//         break;
//     case 2: case 3: // x X
//         vertices.push(...bar[2](f[1], t[1], t1, t2, 4, 4));
//         break;
//     case 4: case 5: // z Z
//         vertices.push(...bar[2](f[1], t[1], t1, t2, 1, 1));
//         break;
//     case 6: case 7: // u U uninitialized
//         vertices.push(...bar[2](f[1], t[1], t1, t2, 6, 6));
//         break;
//     case 8: case 9: // w W weak unknown
//         vertices.push(...bar[2](f[1], t[1], t1, t2, 10, 10));
//         break;
//     case 10: case 11: // l L
//         vertices.push(...bar[0](f[1], t[1], t1, t2, 8, 9));
//         break;
//     case 12: case 13: // h H
//         vertices.push(...bar[1](f[1], t[1], t1, t2, 8, 9));
//         break;
//     default:
//         vertices.push(...bar[2](f[1], t[1], t1, t2, 7, 7));
// }