private static void SetupParticles(EngineContext engineContext)
{
// Create particle system
var particleSystem = new SiliconStudio.Xenko.Particles.ParticleSystem();
// Set particle default size to 10.0f
particleSystem.GetOrCreateFieldWithDefault(ParticleFields.Size, 10.0f);
// Add particle plugins
particleSystem.Plugins.Add(new ResetAcceleration());
particleSystem.Plugins.Add(new SimpleEmitter());
particleSystem.Plugins.Add(new RemoveOldParticles(10.0f));
particleSystem.Plugins.Add(new Gravity());
particleSystem.Plugins.Add(new UpdateVelocity());
// Create particle system mesh for rendering.
var particleEffect = engineContext.RenderContext.Effects.First(x => x.Name == "DefaultParticle");
var particleMesh = new EffectMesh(particleEffect);
particleMesh.Parameters.Set(ParticleRendererPlugin.ParticleSystemKey, particleSystem);
// Load particle texture
var smokeVolTexture = (Texture2D)engineContext.AssetManager.Load <Texture>("/global_data/gdc_demo/fx/smokevol.dds");
particleMesh.Parameters.Set(TexturingKeys.DiffuseTexture, smokeVolTexture);
// Register it to rendering
engineContext.RenderContext.GlobalMeshes.AddMesh(particleMesh);
}
public unsafe void Update(ParticleSystem particleSystem, float dt)
{
var accelerationField = particleSystem.GetOrCreateField(ParticleFields.Acceleration);
foreach (var particle in particleSystem)
{
var acceleration = (Vector3*)particle[accelerationField];
*acceleration += GravityForce;
}
}
public void Update(ParticleSystem particleSystem, float dt)
{
var velocityField = particleSystem.GetOrCreateField(ParticleFields.Velocity);
// No more than 1000 particles
if (particleSystem.ParticleCount < 1000)
{
var particle = particleSystem.AddParticle();
// Default random velocity, going upward
particle.Set(velocityField, new Vector3((float)rand.NextDouble() * 30.0f - 15.0f, (float)rand.NextDouble() * 30.0f - 15.0f, (float)rand.NextDouble() * 50.0f));
}
}
public unsafe void Update(ParticleSystem particleSystem, float dt)
{
var lifetimeField = particleSystem.GetOrCreateField(LifetimeField);
// Iterate over particles
var particleEnumerator = particleSystem.GetEnumerator();
while (particleEnumerator.MoveNext())
{
var particle = particleEnumerator.Current;
var lifetime = (float*)particle[lifetimeField];
// Remove particle through enumerator.
// Enumerator will be valid again in next loop.
if ((*lifetime += dt) > Lifetime)
particleEnumerator.RemoveParticle();
}
}
/// <summary>
/// Updates the location matrices of all elements. Needs to be called even when the particle system is paused for updating the render positions
/// </summary>
/// <param name="parentSystem"><see cref="ParticleSystem"/> containing this emitter</param>
private void UpdateLocations(ParticleSystem parentSystem)
{
drawTransform.Position = parentSystem.Translation;
drawTransform.Rotation = parentSystem.Rotation;
drawTransform.ScaleUniform = parentSystem.UniformScale;
drawTransform.SetParentTransform(null);
if (simulationSpace == EmitterSimulationSpace.World)
{
// Update sub-systems
initialDefaultFields.SetParentTRS(ref parentSystem.Translation, ref parentSystem.Rotation, parentSystem.UniformScale);
foreach (var initializer in Initializers)
{
initializer.SetParentTRS(drawTransform, parentSystem);
}
foreach (var updater in Updaters)
{
updater.SetParentTRS(drawTransform, parentSystem);
}
}
else
{
var posIdentity = new Vector3(0, 0, 0);
var rotIdentity = Quaternion.Identity;
// Update sub-systems
initialDefaultFields.SetParentTRS(ref posIdentity, ref rotIdentity, 1f);
foreach (var initializer in Initializers)
{
initializer.SetParentTRS(identityTransform, parentSystem);
}
foreach (var updater in Updaters)
{
updater.SetParentTRS(identityTransform, parentSystem);
}
}
}
/// <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>
/// Updates the emitter and all its particles, and applies all updaters and spawners.
/// </summary>
/// <param name="dt">Delta time, elapsed time since the last call, in seconds</param>
/// <param name="parentSystem">The parent <see cref="ParticleSystem"/> containing this emitter</param>
public void Update(float dt, ParticleSystem parentSystem)
{
cachedParentSystem = parentSystem;
if (!hasBeenInitialized)
{
DelayedInitialization(parentSystem);
}
UpdateLocations(parentSystem);
EnsurePoolCapacity();
MoveAndDeleteParticles(dt);
ApplyParticleUpdaters(dt);
SpawnNewParticles(dt);
ApplyParticlePostUpdaters(dt);
}
/// <summary>
/// Call this update when the <see cref="ParticleSystem"/> is paused to only update the renreding information
/// </summary>
/// <param name="parentSystem">The parent <see cref="ParticleSystem"/> containing this emitter</param>
public void UpdatePaused(ParticleSystem parentSystem)
{
cachedParentSystem = parentSystem;
UpdateLocations(parentSystem);
}
private static void SetupParticles(EngineContext engineContext)
{
// Create particle system
var particleSystem = new SiliconStudio.Xenko.Particles.ParticleSystem();
// Set particle default size to 10.0f
particleSystem.GetOrCreateFieldWithDefault(ParticleFields.Size, 10.0f);
// Add particle plugins
particleSystem.Plugins.Add(new ResetAcceleration());
particleSystem.Plugins.Add(new SimpleEmitter());
particleSystem.Plugins.Add(new RemoveOldParticles(10.0f));
particleSystem.Plugins.Add(new Gravity());
particleSystem.Plugins.Add(new UpdateVelocity());
// Create particle system mesh for rendering.
var particleEffect = engineContext.RenderContext.Effects.First(x => x.Name == "DefaultParticle");
var particleMesh = new EffectMesh(particleEffect);
particleMesh.Parameters.Set(ParticleRendererPlugin.ParticleSystemKey, particleSystem);
// Load particle texture
var smokeVolTexture = (Texture2D)engineContext.AssetManager.Load<Texture>("/global_data/gdc_demo/fx/smokevol.dds");
particleMesh.Parameters.Set(TexturingKeys.DiffuseTexture, smokeVolTexture);
// Register it to rendering
engineContext.RenderContext.GlobalMeshes.AddMesh(particleMesh);
}
/// <summary>
/// Sets the parent (particle system's) translation, rotation and scale (uniform)
/// The module can choose to inherit, use or ignore any of the elements
/// </summary>
/// <param name="transform"><see cref="ParticleSystem"/>'s transform (from the Transform component) or identity if local space is used</param>
/// <param name="parent">The parent <see cref="ParticleSystem"/></param>
public virtual void SetParentTRS(ParticleTransform transform, ParticleSystem parent)
{
SetParentTransform(transform);
}
public unsafe void Update(ParticleSystem particleSystem, float dt)
{
var accelerationField = particleSystem.GetOrCreateField(ParticleFields.Acceleration);
var velocityField = particleSystem.GetOrCreateField(ParticleFields.Velocity);
foreach (var particle in particleSystem)
{
var position = (Vector3*)particle[particleSystem.Position];
var acceleration = (Vector3*)particle[accelerationField];
var velocity = (Vector3*)particle[velocityField];
*velocity += *acceleration * dt;
*position += *velocity * dt;
}
}
/// <summary>
/// Sets the parent (particle system's) translation, rotation and scale (uniform)
/// The module can choose to inherit, use or ignore any of the elements
/// </summary>
/// <param name="transform"><see cref="ParticleSystem"/>'s transform (from the Transform component) or identity if local space is used</param>
/// <param name="parent">The parent <see cref="ParticleSystem"/></param>
public virtual void SetParentTRS(ParticleTransform transform, ParticleSystem parent)
{
SetParentTransform(transform);
}
