RNG.md

class RandomNumberGenerator

A minimal & cheap generator for pseudo-random numbers.

Constructors

These all set the seed to the specified parameters.

RandomNumberGenerator(unsigned int seed = unsigned(std::time(0)));  // Derive the 64-Bit seed from a 32-Bit seed. If no seed is given use the system time as seed.
RandomNumberGenerator(unsigned int lowSeed, unsigned int highSeed);
RandomNumberGenerator(unsigned long long int fullSeed);

Generator Functions

Generate random numbers inside a specific range, this Range is always inclusive. (E.g. it is always possible that it returns the max value itself.)

float randFloat();                     // float in [0.0, 1.0]
float randFloat(float min, float max); // [min, max]
float randFloat(float max);            // [0, max]
int randInt(int max);
int randInt(int min, int max);

These functions generate a random number for every component of the vector and return them, again in a vector.

Vec2F randVec2F(){ return randVec2F(0.f, 1.f); };
Vec3F randVec3F(){ return randVec3F(0.f, 1.f); };
Vec2F randVec2F(Vec2F max){ return randVec2F(0.f, max); };
Vec3F randVec3F(Vec3F max){ return randVec3F(0.f, max); };
Vec2F randVec2F(Vec2F min, Vec2F max);
Vec3F randVec3F(Vec3F min, Vec3F max);

Generates 32 random bits, all other generator functions are based on this one.

unsigned int generate();

Member Variables

unsigned int HighSeed; // First 32 Bits of the Seed.
unsigned int LowSeed;  // Last  32 Bits of the Seed.

Global Variables

Outside of class scope

extern RandomNumberGenerator gRNG; // A global, default-initialized instance of the RandomNumberGenerator for convinience.