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Use PCG as random number generator

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lluchs committed Apr 20, 2016
1 parent 250bbf9 commit 7005eae55d8fe61edd21d366894f183595f7c199
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@@ -34,7 +34,7 @@ DWORD GenerateRandomPlayerColor(int32_t iTry) // generate a random player color
// generate a random one biased towards max channel luminance
// (for greater color difference and less gray-ish colors)
return C4RGB(std::min(SafeRandom(302), 256), std::min(SafeRandom(302), 256), std::min(SafeRandom(302), 256));
return C4RGB(std::min<int>(SafeRandom(302), 256), std::min<int>(SafeRandom(302), 256), std::min<int>(SafeRandom(302), 256));
bool IsColorConflict(DWORD dwClr1, DWORD dwClr2) // return whether dwClr1 and dwClr2 are closely together
@@ -140,8 +140,8 @@ struct C4RCMassMover
struct C4RCRandom
int Cnt; // index in seed
int Range; // random range query
int Val; // random value
uint32_t Range; // random range query
uint32_t Val; // random value
struct C4RCCreateObj
@@ -3095,7 +3095,7 @@ C4Player *C4Game::JoinPlayer(const char *szFilename, int32_t iAtClient, const ch
return pPlr;
void C4Game::FixRandom(int32_t iSeed)
void C4Game::FixRandom(uint64_t iSeed)
@@ -148,7 +148,7 @@ class C4Game
bool DoKeyboardInput(C4KeyCode vk_code, C4KeyEventType eEventType, bool fAlt, bool fCtrl, bool fShift, bool fRepeated, class C4GUI::Dialog *pForDialog=NULL, bool fPlrCtrlOnly=false, int32_t iStrength=-1);
bool DoKeyboardInput(C4KeyCodeEx Key, C4KeyEventType eEventType, class C4GUI::Dialog *pForDialog=NULL, bool fPlrCtrlOnly=false, int32_t iStrength=-1);
void DrawCrewOverheadText(C4TargetFacet &cgo, int32_t iPlayer);
void FixRandom(int32_t iSeed);
void FixRandom(uint64_t iSeed);
bool Init();
bool PreInit();
void SetScenarioFilename(const char*);
@@ -441,8 +441,8 @@ static std::vector<int32_t> GetRoundPolygon(int32_t x, int32_t y, int32_t size,
vertices.reserve(count * 2);
// varying phase of the sin/cos waves
C4Real begin = itofix(360)*Random(100) / 100;
C4Real begin2 = itofix(360)*Random(100) / 100;
C4Real begin = itofix(360)*(int32_t)Random(100) / 100;
C4Real begin2 = itofix(360)*(int32_t)Random(100) / 100;
// parameters:
// the bigger the factor, the smaller the divergence from a circle
@@ -393,7 +393,7 @@ void C4ParticleValueProvider::RollRandom(const C4Particle *forParticle)
void C4ParticleValueProvider::RollRandomUnseeded()
float range = endValue - startValue;
float rnd = (float)(rand()) / (float)(RAND_MAX);
float rnd = (float)(SafeRandom(RAND_MAX)) / (float)(RAND_MAX);
currentValue = startValue + rnd * range;
@@ -40,7 +40,7 @@ void C4SVal::Set(int32_t std, int32_t rnd, int32_t min, int32_t max)
int32_t C4SVal::Evaluate()
return Clamp(Std+Random(2*Rnd+1)-Rnd,Min,Max);
return Clamp<int32_t>(Std+Random(2*Rnd+1)-Rnd,Min,Max);
void C4SVal::Default()
@@ -22,40 +22,41 @@
#include "control/C4Record.h"
int RandomCount = 0;
static unsigned int RandomHold = 0;
static pcg32 RandomRng;
pcg32 SafeRandom;
void FixedRandom(DWORD dwSeed)
void FixedRandom(uint64_t seed)
// for SafeRandom
RandomHold = dwSeed;
RandomCount = 0;
int Random(int iRange)
static void RecordRandom(uint32_t range, uint32_t val)
if (Config.General.DebugRec)
// next pseudorandom value
C4RCRandom rc;
if (iRange<=0)
RandomHold = ((uint64_t)RandomHold * 16807) % 2147483647;
rc.Val = RandomHold % iRange;
AddDbgRec(RCT_Random, &rc, sizeof(rc));
return rc.Val;
if (iRange<=0) return 0;
RandomHold = ((uint64_t)RandomHold * 16807) % 2147483647;
return RandomHold % iRange;
uint32_t Random()
uint32_t result = RandomRng();
RecordRandom(UINT32_MAX, result);
return result;
uint32_t Random(uint32_t iRange)
uint32_t result = RandomRng(iRange);
RecordRandom(iRange, result);
return result;
@@ -20,24 +20,20 @@
#ifndef INC_C4Random
#define INC_C4Random
#include <pcg/pcg_random.hpp>
extern int RandomCount;
extern pcg32 SafeRandom;
void FixedRandom(DWORD dwSeed);
void FixedRandom(uint64_t dwSeed);
int Random(int iRange);
uint32_t Random(uint32_t iRange);
inline unsigned int SeededRandom(unsigned int iSeed, unsigned int iRange)
inline uint32_t SeededRandom(uint64_t iSeed, uint32_t iRange)
if (!iRange) return 0;
iSeed = iSeed * 214013L + 2531011L;
return (iSeed >> 16) % iRange;
inline int SafeRandom(int range)
if (!range) return 0;
return rand()%range;
pcg32 rng(iSeed);
return rng(iRange);
#endif // INC_C4Random
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