sfw/sfwl/core/random_pcg.cpp

/*************************************************************************/
/*  random_pcg.cpp                                                       */
/*  From https://github.com/Relintai/pandemonium_engine (MIT)            */
/*************************************************************************/

//--STRIP
#include "core/random_pcg.h"

#include "core/sfw_time.h"
#include "core/error_macros.h"
//--STRIP

RandomPCG::RandomPCG(uint64_t p_seed, uint64_t p_inc) :
		pcg(),
		current_inc(p_inc) {
	seed(p_seed);
}

void RandomPCG::randomize() {
	seed((SFWTime::date() + SFWTime::time_us()) * pcg.state + PCG_DEFAULT_INC_64);
}

double RandomPCG::random(double p_from, double p_to) {
	return randd() * (p_to - p_from) + p_from;
}

float RandomPCG::random(float p_from, float p_to) {
	return randf() * (p_to - p_from) + p_from;
}

int RandomPCG::random(int p_from, int p_to) {
	if (p_from == p_to) {
		return p_from;
	}
	return rand(abs(p_from - p_to) + 1) + MIN(p_from, p_to);
}