PulseStudio/VoxelEngine
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update util::PseudoRandom.setSeed

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This commit is contained in:
MihailRis 2024-12-24 20:00:49 +03:00
parent 65b8835698
commit 560288b5c3
1 changed files with 14 additions and 5 deletions
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19
src/maths/util.hpp
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@ -9,6 +9,12 @@
#include <glm/gtx/norm.hpp>
namespace util {
inline uint64_t shuffle_bits_step(uint64_t x, uint64_t m, unsigned shift) {
uint64_t t = ((x >> shift) ^ x) & m;
x = (x ^ t) ^ (t << shift);
return x;
}
constexpr inline float EPSILON = 1e-6f;
class PseudoRandom {
@ -57,17 +63,20 @@ namespace util {
return randU64() / static_cast<double>(UINT64_MAX);
}
void setSeed(int number) {
seed = (static_cast<unsigned short>(number * 23729) ^
static_cast<unsigned short>(number + 16786));
rand();
}
void setSeed(int number1, int number2) {
seed = ((static_cast<unsigned short>(number1 * 23729) |
static_cast<unsigned short>(number2 % 16786)) ^
static_cast<unsigned short>(number2 * number1));
rand();
}
void setSeed(long number) {
number = shuffle_bits_step(number, 0x2222222222222222ull, 1);
number = shuffle_bits_step(number, 0x0c0c0c0c0c0c0c0cull, 2);
number = shuffle_bits_step(number, 0x00f000f000f000f0ull, 4);
seed = number;
rand();
}
};
template<typename T>