Simplify DqnRndPCG
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@ -709,7 +709,7 @@ void DqnRnd_Test()
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{
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LOG_HEADER();
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DqnRndPCG pcg; pcg.Init();
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auto pcg = DqnRndPCG();
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for (i32 i = 0; i < 1000000; i++)
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{
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i32 min = -100;
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@ -1932,7 +1932,7 @@ FILE_SCOPE void DqnJobQueue_Test()
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void DqnQuickSort_Test()
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{
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LOG_HEADER();
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DqnRndPCG state; state.Init();
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auto state = DqnRndPCG();
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if (1)
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{
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DqnMemStack stack = {};
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@ -2247,7 +2247,7 @@ void Dqn_BSearch_Test()
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void DqnMemSet_Test()
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{
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LOG_HEADER();
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DqnRndPCG rnd = DqnRndPCG_();
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auto rnd = DqnRndPCG();
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const int NUM_TIMINGS = 5;
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f64 timings[2][NUM_TIMINGS] = {};
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57
dqn.h
57
dqn.h
@ -766,23 +766,18 @@ DQN_FILE_SCOPE i32 Dqn_I32ToWStr (i32 value, wchar_t *buf, i32
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// #DqnRnd API
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// =================================================================================================
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// NOTE: Uses PCG (Permuted Congruential Generator)
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struct DqnRndPCG
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struct DqnRndPCG // PCG (Permuted Congruential Generator)
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{
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u64 state[2];
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void Init (); // Uses rdstc to create a seed
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void InitWithSeed(u32 seed);
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DqnRndPCG();
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DqnRndPCG(u32 seed);
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u32 Next (); // return: A random number N between [0, 0xFFFFFFFF]
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f32 Nextf(); // return: A random float N between [0.0, 1.0f]
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i32 Range(i32 min, i32 max); // return: A random integer N between [min, max]
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};
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DQN_FILE_SCOPE DqnRndPCG DqnRndPCG_(); // Uses rdtsc to create a seed
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DQN_FILE_SCOPE DqnRndPCG DqnRndPCG_(u32 seed);
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// #Dqn_* API
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// =================================================================================================
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// return: The number of splits in the array. If array is null this returns the required size of the array.
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@ -835,8 +830,7 @@ DQN_FILE_SCOPE void Dqn_QuickSort(T *array, i64 size,
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}
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#endif
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DqnRndPCG state; state.Init();
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auto state = DqnRndPCG();
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auto lastIndex = size - 1;
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auto pivotIndex = (i64)state.Range(0, (i32)lastIndex);
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auto partitionIndex = 0;
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@ -907,8 +901,7 @@ DQN_FILE_SCOPE void Dqn_QuickSort(T *array, i64 size)
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}
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#endif
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DqnRndPCG state; state.Init();
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auto state = DqnRndPCG();
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auto lastIndex = size - 1;
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auto pivotIndex = (i64)state.Range(0, (i32)lastIndex); // TODO(doyle): RNG 64bit
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auto partitionIndex = 0;
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@ -5925,23 +5918,23 @@ DQN_FILE_SCOPE i32 Dqn_I32ToWstr(i32 value, wchar_t *buf, i32 bufSize)
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// < 1.0f. Contributed by Jonatan Hedborg
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// NOTE: This is to abide to strict aliasing rules.
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union DqnRndInternal_U32F32
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union DqnRnd__U32F32
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{
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u32 unsigned32;
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f32 float32;
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};
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FILE_SCOPE f32 DqnRndInternal_F32NormalizedFromU32(u32 value)
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FILE_SCOPE f32 DqnRnd__F32NormalizedFromU32(u32 value)
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{
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u32 exponent = 127;
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u32 mantissa = value >> 9;
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union DqnRndInternal_U32F32 uf;
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union DqnRnd__U32F32 uf;
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uf.unsigned32 = (exponent << 23 | mantissa);
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return uf.float32 - 1.0f;
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}
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FILE_SCOPE u64 DqnRndInternal_Murmur3Avalanche64(u64 h)
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FILE_SCOPE u64 DqnRnd__Murmur3Avalanche64(u64 h)
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{
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h ^= h >> 33;
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h *= 0xff51afd7ed558ccd;
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@ -5955,7 +5948,7 @@ FILE_SCOPE u64 DqnRndInternal_Murmur3Avalanche64(u64 h)
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#include <x86intrin.h> // __rdtsc
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#endif
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FILE_SCOPE u32 DqnRndInternal_MakeSeed()
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FILE_SCOPE u32 DqnRnd__MakeSeed()
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{
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#if defined(DQN_WIN32_PLATFORM) || defined(DQN_UNIX_PLATFORM)
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i64 numClockCycles = __rdtsc();
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@ -5969,37 +5962,23 @@ FILE_SCOPE u32 DqnRndInternal_MakeSeed()
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#endif
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}
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DQN_FILE_SCOPE DqnRndPCG DqnRndPCG_()
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DqnRndPCG::DqnRndPCG()
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{
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DqnRndPCG result;
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result.Init();
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return result;
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u32 seed = DqnRnd__MakeSeed();
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*this = DqnRndPCG(seed);
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}
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DQN_FILE_SCOPE DqnRndPCG DqnRndPCG_(u32 seed)
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DqnRndPCG::DqnRndPCG(u32 seed)
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{
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DqnRndPCG result;
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result.InitWithSeed(seed);
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return result;
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}
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void DqnRndPCG::InitWithSeed(u32 seed)
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{
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u64 value = (((u64)seed) << 1ULL) | 1ULL;
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value = DqnRndInternal_Murmur3Avalanche64(value);
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u64 value = (((u64)seed) << 1ULL) | 1ULL;
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value = DqnRnd__Murmur3Avalanche64(value);
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this->state[0] = 0U;
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this->state[1] = (value << 1ULL) | 1ULL;
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this->Next();
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this->state[0] += DqnRndInternal_Murmur3Avalanche64(value);
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this->state[0] += DqnRnd__Murmur3Avalanche64(value);
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this->Next();
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}
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void DqnRndPCG::Init()
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{
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u32 seed = DqnRndInternal_MakeSeed();
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this->InitWithSeed(seed);
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}
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u32 DqnRndPCG::Next()
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{
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u64 oldstate = this->state[0];
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@ -6011,7 +5990,7 @@ u32 DqnRndPCG::Next()
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f32 DqnRndPCG::Nextf()
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{
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f32 result = DqnRndInternal_F32NormalizedFromU32(this->Next());
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f32 result = DqnRnd__F32NormalizedFromU32(this->Next());
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return result;
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}
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