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The diagonal mirror routine for the 11x10 board in my go toolkit
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| void mirror_d() pure nothrow @nogc @safe | |
| in | |
| { | |
| assert(valid); | |
| assert(can_rotate); | |
| } | |
| out | |
| { | |
| assert(valid); | |
| assert(can_rotate); | |
| } | |
| body | |
| { | |
| enum D_SHIFT = V_SHIFT - H_SHIFT; | |
| enum Z_SHIFT = V_SHIFT + H_SHIFT; | |
| enum WEST_BLOCK = 0x1F01F01F01F01FUL; | |
| enum EAST_BLOCK = 0x3E03E03E03E03E0UL; | |
| north_bits = ( | |
| (north_bits & 0x210UL) << (4 * D_SHIFT) | | |
| (north_bits & 0x210108UL) << (3 * D_SHIFT) | | |
| (north_bits & 0x210108084UL) << (2 * D_SHIFT) | | |
| (north_bits & 0x210108084042UL) << D_SHIFT | | |
| (north_bits & 0x210108084042021UL) | | |
| (north_bits & 0x108084042021000UL) >> D_SHIFT | | |
| (north_bits & 0x84042021000000UL) >> (2 * D_SHIFT) | | |
| (north_bits & 0x42021000000000UL) >> (3 * D_SHIFT) | | |
| (north_bits & 0x21000000000000UL) >> (4 * D_SHIFT) | |
| ); | |
| auto temp = north_bits & EAST_BLOCK; | |
| south_bits = ( | |
| (south_bits & 0x21UL) << (4 * Z_SHIFT) | | |
| (south_bits & 0x21042UL) << (3 * Z_SHIFT) | | |
| (south_bits & 0x21042084UL) << (2 * Z_SHIFT) | | |
| (south_bits & 0x21042084108UL) << Z_SHIFT | | |
| (south_bits & 0x21042084108210UL) | | |
| (south_bits & 0x42084108210000UL) >> Z_SHIFT | | |
| (south_bits & 0x84108210000000UL) >> (2 * Z_SHIFT) | | |
| (south_bits & 0x108210000000000UL) >> (3 * Z_SHIFT) | | |
| (south_bits & 0x210000000000000UL) >> (4 * Z_SHIFT) | |
| ); | |
| temp |= south_bits & WEST_BLOCK; | |
| temp = ( | |
| (temp & (H_WALL << (0 * V_SHIFT))) << (4 * V_SHIFT) | | |
| (temp & (H_WALL << (1 * V_SHIFT))) << (2 * V_SHIFT) | | |
| (temp & (H_WALL << (2 * V_SHIFT))) | | |
| (temp & (H_WALL << (3 * V_SHIFT))) >> (2 * V_SHIFT) | | |
| (temp & (H_WALL << (4 * V_SHIFT))) >> (4 * V_SHIFT) | |
| ); | |
| north_bits = (north_bits & WEST_BLOCK) | (temp & WEST_BLOCK) << (5 * H_SHIFT); | |
| south_bits = (south_bits & EAST_BLOCK) | (temp & EAST_BLOCK) >> (5 * H_SHIFT); | |
| } |
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