mirror of https://github.com/dnomd343/klotski.git
Dnomd343
2 years ago
5 changed files with 317 additions and 27 deletions
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/// Klotski Engine by Dnomd343 @2024
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// TODO: only copy from old implementation, the interfaces will change in future.
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/// The main purpose of klotski calculation is to obtain all the next steps in
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/// order to carry out the BFS algorithm. The definition of the next step is
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/// the result of moving an arbitrary block in the current layout for a limited
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/// number of times, and the resulting layout is different from the original.
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/// Eg1:
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/// % # # % % # # % % # # % % # # % % # # %
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/// % # # % % # # % % # # % % # # % % # # %
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/// @ $ $ @ --> @ $ $ @ @ $ $ @ @ $ $ @ @ $ $ @
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/// @ & * @ @ * @ @ * @ @ & @ @ & @
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/// * & * & & * & & * * & * * &
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/// |
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/// | % # # % % # # % % # # % % # # %
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/// | % # # % % # # % % # # % % # # %
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/// | ------> @ $ $ @ @ $ $ @ @ $ $ @ @ $ $ @
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/// @ & * @ @ & * @ @ & * @ @ & * @
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/// * & * & * & * &
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/// Eg2:
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/// * @ & % * @ & % * @ & % * @ & %
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/// # # $ % # # $ % # # $ % # # $ %
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/// # # $ ^ --> # # $ ^ # # $ ^ # # $ ^
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/// ~ ~ ^ ~ ~ ^ ~ ~ ^ @ ~ ~ ^
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/// @ % % @ % % @ % % % %
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/// In order to achieve the purpose of searching for the next step, we should
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/// find out the sub-layouts that can be derived from each block. Due to the
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/// limited steps of moving, with the help of a sub-BFS search, the target can
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/// be obtained. It can be shown that this step produces at most `15` derived
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/// layouts, so it can be stored and computed in a queue which length 16. By
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/// performing such a search on each block in the layout, we can get all the
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/// next-step layouts, which have a minimum of `0` and a maximum of `68`.
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/// For a single block, search for the situation after it has moved one grid,
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/// `addr` is its current position information, which is (0 ~ 19) * 3. When
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/// moving up and down, judge the value of `addr` to confirm whether it is out
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/// of bounds; when moving left and right, get its remainder to `4` to judge
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/// whether it will be out of bounds. After confirming that it will not cross
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/// the boundary, it is necessary to judge whether it will collide with other
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/// blocks after moving, that is, the target position needs to be empty, which
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/// is represented as `000` in the RawCode, and the template will be used to
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/// perform bit operations here to confirm whether it is feasible.
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/// Finally, in order to improve efficiency, the `filter` option is added. For
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/// the direction of the last movement, it will be ignored in the next search,
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/// so as to optimize BFS. After confirming that it can be moved, the moved
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/// layout can be directly obtained by means of bit operations, and a mask will
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/// be obtained at the same time, which marks the moved block as `111`, which
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/// will speed up subsequent calculations. The generated layout will be
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/// inserted into the cache, and after the BFS search for each block is
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/// completed, the core will use the callback function to output these
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/// results.
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#pragma once |
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#include <cstdint> |
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#include <utility> |
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#include <functional> |
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namespace klotski::core { |
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class Core { |
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public: |
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/// Release with code and mask
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typedef std::function<void(uint64_t, uint64_t)> release_t; |
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/// Core interface
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void next_cases(uint64_t code, uint64_t mask); |
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explicit Core(release_t release_func) : release_(std::move(release_func)) {} |
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private: |
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struct cache_t { |
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uint64_t code; |
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uint64_t mask; /// (000) or (111)
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int filter; /// DIR_UP | DIR_DOWN | DIR_LEFT | DIR_RIGHT
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int addr; /// (0 ~ 19) * 3
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}; |
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int cache_size_ = 1; |
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cache_t cache_[16]{}; |
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release_t release_; // release function
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void move_1x1(uint64_t code, int addr); |
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void move_1x2(uint64_t code, int addr); |
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void move_2x1(uint64_t code, int addr); |
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void move_2x2(uint64_t code, int addr); |
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inline void cache_insert(cache_t next_case); |
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}; |
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} // namespace klotski::core
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#include "core/core.h" |
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#include "utils/common.h" |
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/// block move direction
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#define DIR_UP (-4 * 3) |
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#define DIR_LEFT (-1 * 3) |
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#define DIR_DOWN (+4 * 3) |
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#define DIR_RIGHT (+1 * 3) |
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/// block direction limit
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#define ALLOW_UP (filter != -DIR_UP) |
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#define ALLOW_DOWN (filter != -DIR_DOWN) |
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#define ALLOW_LEFT (filter != -DIR_LEFT) |
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#define ALLOW_RIGHT (filter != -DIR_RIGHT) |
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/// horizontal restraints
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#define NOT_COLUMN_0 ((addr & 3) != 0b00) |
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#define NOT_COLUMN_2 ((addr & 3) != 0b10) |
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#define NOT_COLUMN_3 ((addr & 3) != 0b01) |
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/// try to move block
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#define MOVE_UP (next_addr = addr + DIR_UP) |
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#define MOVE_DOWN (next_addr = addr + DIR_DOWN) |
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#define MOVE_LEFT (next_addr = addr + DIR_LEFT) |
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#define MOVE_RIGHT (next_addr = addr + DIR_RIGHT) |
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/// vertical restraints
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#define TOP_LIMIT(ADDR) (addr >= ADDR * 3) |
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#define BOTTOM_LIMIT(ADDR) (addr <= ADDR * 3) |
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/// check if the block can move
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#define CHECK_UP(MASK) !(code >> MOVE_UP & MASK) |
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#define CHECK_DOWN(MASK) !(code >> MOVE_DOWN & MASK) |
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#define CHECK_LEFT(MASK) !(code >> MOVE_LEFT & MASK) |
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#define CHECK_RIGHT(MASK) !(code >> MOVE_RIGHT & MASK) |
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/// release next code
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#define RELEASE_1x1(FILTER) RELEASE(NEXT_CODE_1x1, FILTER) |
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#define RELEASE_1x2(FILTER) RELEASE(NEXT_CODE_1x2, FILTER) |
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#define RELEASE_2x1(FILTER) RELEASE(NEXT_CODE_2x1, FILTER) |
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#define RELEASE_2x2(FILTER) RELEASE(NEXT_CODE_2x2, FILTER) |
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/// calculate next code
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#define NEXT_CODE_1x1 ((code & ~(K_MASK_1x1_ << addr)) | (K_MASK_1x1 << next_addr)) |
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#define NEXT_CODE_1x2 ((code & ~(K_MASK_1x2_ << addr)) | (K_MASK_1x2 << next_addr)) |
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#define NEXT_CODE_2x1 ((code & ~(K_MASK_2x1_ << addr)) | (K_MASK_2x1 << next_addr)) |
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#define NEXT_CODE_2x2 ((code & ~(K_MASK_2x2_ << addr)) | (K_MASK_2x2 << next_addr)) |
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///////////////////////////////////////////////
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#define RELEASE(NEXT_CODE, FILTER) \ |
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cache_insert(cache_t { \ |
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.code = NEXT_CODE, \ |
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.mask = K_MASK_1x1_ << next_addr, \ |
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.filter = FILTER, \ |
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.addr = next_addr \ |
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}); |
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///////////////////////////////////////////////
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#define BFS_INIT \ |
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int next_addr; \ |
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int current = 0; \ |
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cache_[0].addr = addr; |
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#define BFS_LOAD \ |
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code = cache_[current].code; \ |
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addr = cache_[current].addr; \ |
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int filter = cache_[current++].filter; |
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#define BFS_STOP \ |
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(current == cache_size_) |
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///////////////////////////////////////////////
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using klotski::core::Core; |
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inline void Core::cache_insert(cache_t next_case) { // try to insert into cache
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auto *cache_ptr = cache_; |
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for (; cache_ptr < cache_ + cache_size_; ++cache_ptr) { |
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if (cache_ptr->code == next_case.code) { |
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return; // already exist -> insert failed
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} |
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} |
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*cache_ptr = next_case; // cache push back
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++cache_size_; |
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} |
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void Core::move_1x1(uint64_t code, int addr) { // try to move target 1x1 block
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BFS_INIT |
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while (!BFS_STOP) { // bfs search process
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BFS_LOAD |
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if (ALLOW_UP && TOP_LIMIT(4) && CHECK_UP(K_MASK_1x1_)) { |
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RELEASE_1x1(DIR_UP) // 1x1 block move up
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} |
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if (ALLOW_DOWN && BOTTOM_LIMIT(15) && CHECK_DOWN(K_MASK_1x1_)) { |
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RELEASE_1x1(DIR_DOWN) // 1x1 block move down
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} |
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if (ALLOW_LEFT && NOT_COLUMN_0 && CHECK_LEFT(K_MASK_1x1_)) { |
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RELEASE_1x1(DIR_LEFT) // 1x1 block move left
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} |
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if (ALLOW_RIGHT && NOT_COLUMN_3 && CHECK_RIGHT(K_MASK_1x1_)) { |
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RELEASE_1x1(DIR_RIGHT) // 1x1 block move right
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} |
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} |
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} |
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void Core::move_1x2(uint64_t code, int addr) { // try to move target 1x2 block
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BFS_INIT |
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while (!BFS_STOP) { // bfs search process
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BFS_LOAD |
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if (ALLOW_UP && TOP_LIMIT(4) && CHECK_UP(K_MASK_1x2_)) { |
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RELEASE_1x2(DIR_UP) // 1x2 block move up
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} |
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if (ALLOW_DOWN && BOTTOM_LIMIT(14) && CHECK_DOWN(K_MASK_1x2_)) { |
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RELEASE_1x2(DIR_DOWN) // 1x2 block move down
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} |
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if (ALLOW_LEFT && NOT_COLUMN_0 && CHECK_LEFT(K_MASK_1x1_)) { |
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RELEASE_1x2(DIR_LEFT) // 1x2 block move left
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} |
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if (ALLOW_RIGHT && NOT_COLUMN_2 && CHECK_RIGHT(K_MASK_1x1_R)) { |
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RELEASE_1x2(DIR_RIGHT) // 1x2 block move right
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} |
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} |
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} |
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void Core::move_2x1(uint64_t code, int addr) { // try to move target 2x1 block
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BFS_INIT |
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while (!BFS_STOP) { // bfs search process
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BFS_LOAD |
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if (ALLOW_UP && TOP_LIMIT(4) && CHECK_UP(K_MASK_1x1_)) { |
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RELEASE_2x1(DIR_UP) // 2x1 block move up
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} |
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if (ALLOW_DOWN && BOTTOM_LIMIT(11) && CHECK_DOWN(K_MASK_1x1_D)) { |
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RELEASE_2x1(DIR_DOWN) // 2x1 block move down
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} |
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if (ALLOW_LEFT && NOT_COLUMN_0 && CHECK_LEFT(K_MASK_2x1_)) { |
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RELEASE_2x1(DIR_LEFT) // 2x1 block move left
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} |
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if (ALLOW_RIGHT && NOT_COLUMN_3 && CHECK_RIGHT(K_MASK_2x1_)) { |
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RELEASE_2x1(DIR_RIGHT) // 2x1 block move right
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} |
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} |
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} |
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void Core::move_2x2(uint64_t code, int addr) { // try to move target 2x2 block
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BFS_INIT |
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while (!BFS_STOP) { // bfs search process
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BFS_LOAD |
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if (ALLOW_UP && TOP_LIMIT(4) && CHECK_UP(K_MASK_1x2_)) { |
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RELEASE_2x2(DIR_UP) // 2x2 block move up
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} |
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if (ALLOW_DOWN && BOTTOM_LIMIT(10) && CHECK_DOWN(K_MASK_1x2_D)) { |
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RELEASE_2x2(DIR_DOWN) // 2x2 block move down
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} |
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if (ALLOW_LEFT && NOT_COLUMN_0 && CHECK_LEFT(K_MASK_2x1_)) { |
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RELEASE_2x2(DIR_LEFT) // 2x2 block move left
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} |
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if (ALLOW_RIGHT && NOT_COLUMN_2 && CHECK_RIGHT(K_MASK_2x1_R)) { |
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RELEASE_2x2(DIR_RIGHT) // 2x2 block move right
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} |
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} |
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} |
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void Core::next_cases(uint64_t code, uint64_t mask) { // search next step cases
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cache_[0].filter = 0; // without filter
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cache_[0].code = code; // bfs root code
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auto range = code | mask; |
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for (int addr = 0; range; addr += 3, range >>= 3) { // traverse every 3-bits
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switch (range & 0b111) { // match low 3-bits
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case BLOCK_1x1: |
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move_1x1(code, addr); // try to move 1x1 block
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break; |
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case BLOCK_1x2: |
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move_1x2(code, addr); // try to move 1x2 block
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break; |
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case BLOCK_2x1: |
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move_2x1(code, addr); // try to move 2x1 block
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break; |
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case BLOCK_2x2: |
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move_2x2(code, addr); // try to move 2x2 block
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break; |
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default: |
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continue; // B_space or B_fill
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} |
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if (cache_size_ != 1) { // found one or more next cases
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for (int i = 1; i < cache_size_; ++i) { |
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release_(cache_[i].code, cache_[i].mask); // release next cases
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} |
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cache_size_ = 1; // reset cache size
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} |
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} |
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} |
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