56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
#ifndef MATHS_UTIL_HPP_
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#define MATHS_UTIL_HPP_
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#include <stdint.h>
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#include <ctime>
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class PseudoRandom {
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unsigned short seed;
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public:
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PseudoRandom() {
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seed = (unsigned short)time(0);
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}
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int rand() {
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seed = (seed + 0x7ed5 + (seed << 6));
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seed = (seed ^ 0xc23c ^ (seed >> 9));
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seed = (seed + 0x1656 + (seed << 3));
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seed = ((seed + 0xa264) ^ (seed << 4));
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seed = (seed + 0xfd70 - (seed << 3));
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seed = (seed ^ 0xba49 ^ (seed >> 8));
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return (int)seed;
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}
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int32_t rand32() {
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return (rand() << 16) | rand();
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}
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uint32_t randU32() {
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return (rand() << 16) | rand();
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}
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int64_t rand64() {
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uint64_t x = randU32();
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uint64_t y = randU32();
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return (x << 32ULL) | y;
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}
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void setSeed(int number) {
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seed =
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((unsigned short)(number * 23729) ^ (unsigned short)(number + 16786)
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);
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rand();
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}
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void setSeed(int number1, int number2) {
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seed =
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(((unsigned short)(number1 * 23729) |
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(unsigned short)(number2 % 16786)) ^
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(unsigned short)(number2 * number1));
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rand();
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}
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};
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#endif // MATHS_UTIL_HPP_
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