metaforce/Runtime/CRandom16.hpp

78 lines
1.5 KiB
C++

#ifndef RETRO_CRANDOM16_HPP
#define RETRO_CRANDOM16_HPP
#include "GCNTypes.hpp"
namespace urde
{
class CRandom16
{
u32 m_seed;
static CRandom16* g_randomNumber;
public:
CRandom16() = default;
CRandom16(u32 p) : m_seed(p) {}
inline u32 Next()
{
m_seed = (m_seed * 0x41c64e6d) + 0x00003039;
return m_seed >> 16;
}
inline u32 GetSeed() const
{
return m_seed;
}
inline void SetSeed(u32 p)
{
m_seed = p;
}
inline float Float()
{
return Next() * 0.000015259022f;
}
inline float Range(float min, float max)
{
return min + Float() * (max - min);
}
inline s32 Range(s32 min, s32 max)
{
return min + (Next() % ((max - min) + 1));
}
static CRandom16* GetRandomNumber() {return g_randomNumber;}
static void SetRandomNumber(CRandom16* rnd) {g_randomNumber = rnd;}
};
class CGlobalRandom
{
CRandom16& m_random;
CGlobalRandom* m_prev;
static CGlobalRandom* g_currentGlobalRandom;
public:
CGlobalRandom(CRandom16& rand)
: m_random(rand), m_prev(g_currentGlobalRandom)
{
g_currentGlobalRandom = this;
CRandom16::SetRandomNumber(&m_random);
}
~CGlobalRandom()
{
g_currentGlobalRandom = m_prev;
if (m_prev)
CRandom16::SetRandomNumber(&m_prev->m_random);
else
CRandom16::SetRandomNumber(nullptr);
}
};
}
#endif // RETRO_CRANDOM16_HPP