//---------------------------------------------------------------
#endregion
//---------------------------------------------------------------
//---------------------------------------------------------------
#region Methods
//---------------------------------------------------------------
/// <summary>
/// Updates the particle system.
/// </summary>
/// <param name="deltaTime">The time since the last update.</param>
public override void Update(float deltaTime)
{
UpdateAge(deltaTime);
// delete dead particles
FixedRoundBuffer buffer = particles as FixedRoundBuffer;
while (buffer.Count > 0 && !(buffer[0] as IParticle).IsAlive)
{
buffer.RemoveFirst();
}
UpdateParticles(deltaTime);
EmitParticles(deltaTime);
ITexture2d texture = Texture;
if (particles.Count >= 2)
{
// update streams
PositionStream posStream = (PositionStream)vertexUnit[typeof(PositionStream)];
ColorStream colorStream = (ColorStream)vertexUnit[typeof(ColorStream)];
TextureStream textureStream = (TextureStream)vertexUnit[typeof(TextureStream)];
// Update all particles
for (int i = 0; i < particles.Count; i++)
{
int offset = i * 2;
IParticle particle = particles[i] as IParticle;
IParticle3d particle3d = particles[i] as IParticle3d;
if (particle3d != null)
{
Vector3 position = particle3d.Position;
posStream[offset] = position + particle.Size.X * (particle as IParticleOrientation).Orientation;
posStream[offset + 1] = position - particle.Size.X * (particle as IParticleOrientation).Orientation;
}
IParticleColor particleColor = particles[i] as IParticleColor;
if (particleColor != null)
{
colorStream[offset] = particleColor.Color;
colorStream[offset + 1] = particleColor.Color;
}
float tx = texture.TextureCoordinates.Left + texture.TextureCoordinates.Width * particle.Age / particle.LifeTime;
textureStream[offset] = new Vector2(tx, texture.TextureCoordinates.Top);
textureStream[offset + 1] = new Vector2(tx, texture.TextureCoordinates.Bottom);
}
posStream.Upload();
colorStream.Upload();
textureStream.Upload();
}
}
//---------------------------------------------------------------
#endregion
//---------------------------------------------------------------
//---------------------------------------------------------------
#region Initialisation
//---------------------------------------------------------------
/// <summary>
/// Creates a new instance of a particle system.
/// </summary>
/// <param name="size">The max number of particles.</param>
public LineParticleSystem(int size) : base( )
{
textures = new Textures();
particles = new FixedRoundBuffer(size);
// Create a new format
VertexFormat format = new VertexFormat(
new Type[] { typeof(PositionStream), typeof(ColorStream), typeof(TextureStream) });
// create VertexUnit and IndexStream
vertexUnit = new VertexUnit(format, 2 + size * 2);
indexStream = IndexStream.FromChain(size - 1);
// load shaders from the resource files
using (System.IO.Stream fxStream = Purple.IO.ResourceFileSystem.Instance.Open("Purple/Graphics/Particles/LineParticle.fx")) {
Effect = EffectCompiler.Instance.Compile(fxStream);
}
}
