19 lines
473 B
C++
19 lines
473 B
C++
// TODO: This file needs a serious audit
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#include <cstdint>
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constexpr uint64_t half_max = UINT64_MAX / 2;
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// From https://en.wikipedia.org/wiki/Xorshift
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inline void xorshift64(uint64_t &state) {
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state ^= state << 13;
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state ^= state >> 7;
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state ^= state << 17;
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}
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// returns a random value between -1 and 1. modifies seed
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inline float norm_rand(uint64_t &state) {
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xorshift64(state);
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return static_cast<float>(state - half_max) / static_cast<float>(half_max);
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}
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