Method NextInt

src/FastRandom.cpp:102–115

int cFastRandom::NextInt(int a_Range)
{
	ASSERT(a_Range <= 1000000);  // The random is not sufficiently linearly distributed with bigger ranges
	ASSERT(a_Range > 0);
	
	// Make the m_Counter operations as minimal as possible, to emulate atomicity
	int Counter = m_Counter++;
	
	// Use a_Range, m_Counter and m_Seed as inputs to the pseudorandom function:
	int n = a_Range + Counter * 57 + m_Seed * 57 * 57;
	n = (n << 13) ^ n;
	n = ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff);
	return ((n / 11) % a_Range);
}