mirror of https://github.com/AxioDL/metaforce.git
81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
#ifndef RETRO_CRANDOM16_HPP
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#define RETRO_CRANDOM16_HPP
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#include <stdint.h>
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namespace Retro
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{
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extern class CRandom16* GLOBAL_RANDOM;
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extern class CGlobalRandom* GLOBAL_RANDOM_TOKEN;
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class CRandom16
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{
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uint32_t m_seed;
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public:
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CRandom16(uint32_t p) : m_seed(p) {}
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inline uint32_t Next()
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{
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m_seed = (m_seed * 0x41c64e6d) + 0x00003039;
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return m_seed >> 16;
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}
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inline uint32_t GetSeed() const
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{
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return m_seed;
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}
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inline void SetSeed(uint32_t p)
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{
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m_seed = p;
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}
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inline float Float()
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{
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return Next() * 0.000015259022;
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}
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inline float Range(float min, float max)
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{
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return min + Float() * (max - min);
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}
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inline int32_t Range(int32_t min, int32_t max)
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{
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int64_t diff = max - min;
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int64_t rand = -1;
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while (rand < 0)
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rand = int32_t((Next() << 16) | Next());
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return rand % diff + min;
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}
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static CRandom16* GetRandomNumber() {return GLOBAL_RANDOM;}
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static void SetRandomNumber(CRandom16* rnd) {GLOBAL_RANDOM = rnd;}
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};
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class CGlobalRandom
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{
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CRandom16& m_random;
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CGlobalRandom* m_prev;
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public:
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CGlobalRandom(CRandom16& rand)
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: m_random(rand), m_prev(GLOBAL_RANDOM_TOKEN)
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{
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GLOBAL_RANDOM_TOKEN = this;
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CRandom16::SetRandomNumber(&m_random);
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}
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~CGlobalRandom()
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{
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GLOBAL_RANDOM_TOKEN = m_prev;
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if (m_prev)
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CRandom16::SetRandomNumber(&m_prev->m_random);
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else
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CRandom16::SetRandomNumber(nullptr);
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}
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};
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}
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#endif // RETRO_CRANDOM16_HPP
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