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https://github.com/zhenyan121/Cubed.git
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f4114c2699
* refactor: use TBB for concurrent hash maps and parallelize chunk processing * fix: tbb link fail * refactor(chunk): remove biome check for caves in rivers and oceans * refactor(random): replace std distributions with custom implementations Avoid overhead and platform-dependent behavior of `<random>` distributions by using direct engine operations and integer arithmetic. This ensures deterministic, cross-platform results and improves performance. * refactor(generation): use chunk seed for cave and river paths - Use per-chunk seed instead of global path_id for cave and river generation. - Remove unused m_sum variables and m_path_id members. - Clamp river yaw within 10 degrees of initial direction. - Fix river radius interpolation (use t instead of 1-t). - Lower sea level from 64 to 63.
44 lines
1019 B
C++
44 lines
1019 B
C++
#pragma once
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#include <cstdint>
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#include <string_view>
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namespace Cubed {
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namespace HASH {
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inline std::size_t str(std::string_view value) {
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return std::hash<std::string_view>{}(value);
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}
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inline uint32_t combine_32(uint32_t seed, uint32_t v) {
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seed ^= v + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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return seed;
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}
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inline uint32_t chunk_seed_hash(int32_t a, int32_t b, uint32_t fixed_seed) {
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uint32_t seed =
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combine_32(combine_32(fixed_seed, (uint32_t)a), (uint32_t)b);
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return seed;
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}
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/*
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inline uint32_t chunk_seed_hash(int32_t a, int32_t b, uint32_t fixed_seed) {
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uint32_t h = fixed_seed;
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h ^= (uint32_t)a * 0xcc9e2d51u;
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h = (h << 15) | (h >> 17); // rotl 15
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h *= 0x1b873593u;
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h ^= (uint32_t)b * 0xcc9e2d51u;
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h = (h << 15) | (h >> 17); // rotl 15
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h *= 0x1b873593u;
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// Finalization（avalanche）
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h ^= h >> 16;
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h *= 0x85ebca6bu;
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h ^= h >> 13;
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h *= 0xc2b2ae35u;
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h ^= h >> 16;
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return h;
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}
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*/
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} // namespace HASH
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} // namespace Cubed
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