/// <summary>
/// Some parameters should be initialized when the emitter first runs, rather than in the constructor
/// </summary>
protected unsafe void DelayedInitialization(ParticleSystem parentSystem)
{
if (hasBeenInitialized)
{
return;
}
hasBeenInitialized = true;
// RandomNumberGenerator creation
{
uint rngSeed = 0; // EmitterRandomSeedMethod.Fixed
if (randomSeedMethod == EmitterRandomSeedMethod.Time)
{
// Stopwatch has maximum possible frequency, so rngSeeds initialized at different times will be different
rngSeed = unchecked ((uint)Stopwatch.GetTimestamp());
}
else if (randomSeedMethod == EmitterRandomSeedMethod.Position)
{
// Different float have different uint representation so randomness should be good
// The only problem occurs when the three position components are the same
var posX = parentSystem.Translation.X;
var posY = parentSystem.Translation.Y;
var posZ = parentSystem.Translation.Z;
var uintX = *((uint *)(&posX));
var uintY = *((uint *)(&posY));
var uintZ = *((uint *)(&posZ));
// Add some randomness to prevent glitches when positions are the same (diagonal)
uintX ^= (uintX >> 19);
uintY ^= (uintY >> 8);
rngSeed = uintX ^ uintY ^ uintZ;
}
RandomSeedGenerator = new ParticleRandomSeedGenerator(rngSeed);
}
}
/// <summary>
/// Some parameters should be initialized when the emitter first runs, rather than in the constructor
/// </summary>
protected unsafe void DelayedInitialization(ParticleSystem parentSystem)
{
if (hasBeenInitialized)
return;
hasBeenInitialized = true;
// RandomNumberGenerator creation
{
uint rngSeed = 0; // EmitterRandomSeedMethod.Fixed
if (randomSeedMethod == EmitterRandomSeedMethod.Time)
{
// Stopwatch has maximum possible frequency, so rngSeeds initialized at different times will be different
rngSeed = unchecked((uint)Stopwatch.GetTimestamp());
}
else if (randomSeedMethod == EmitterRandomSeedMethod.Position)
{
// Different float have different uint representation so randomness should be good
// The only problem occurs when the three position components are the same
var posX = parentSystem.Translation.X;
var posY = parentSystem.Translation.Y;
var posZ = parentSystem.Translation.Z;
var uintX = *((uint*)(&posX));
var uintY = *((uint*)(&posY));
var uintZ = *((uint*)(&posZ));
// Add some randomness to prevent glitches when positions are the same (diagonal)
uintX ^= (uintX >> 19);
uintY ^= (uintY >> 8);
rngSeed = uintX ^ uintY ^ uintZ;
}
RandomSeedGenerator = new ParticleRandomSeedGenerator(rngSeed);
}
}
