public override void ComputeProperties(ParticlePool pool, ParticleBufferAccessor bufferAccessor)
{
foreach (var i in pool.AliveParticles)
{
var size = bufferAccessor.Size;
float fade = Interpolation.ValueAt(pool.Particles[i].Phase, Start, End, 0.0f, 1.0f, Easing);
size *= fade;
bufferAccessor.Size = size;
bufferAccessor.Index++;
}
}
protected override void ApplyDrawNode(DrawNode3D node)
{
base.ApplyDrawNode(node);
var n = (ParticleSystemDrawNode)node;
n.Shader = shader;
n.Texture = Texture;
n.Pool = pool;
n.InverseViewMatrix = Scene.Camera.InverseViewMatrix;
if (gpuBuffer == null)
{
gpuBuffer = new BufferTextureGL();
}
n.Buffer = gpuBuffer;
// Create data as matrices
// TODO: Reuse array
n.BufferData = new float[ParticleBufferAccessor.ParticleStride * pool.AliveParticles.Count];
using (ParticleBufferAccessor bufferAccessor = new ParticleBufferAccessor(n.BufferData))
{
// Write base properties
// TODO: Detect which properties have computed variant and skip those here
bufferAccessor.Index = 0;
foreach (var i in pool.AliveParticles)
{
bufferAccessor.Position = pool.Particles[i].Position;
bufferAccessor.Rotation = pool.Particles[i].Rotation;
bufferAccessor.Colour = pool.Particles[i].Colour;
bufferAccessor.Size = pool.Particles[i].Size;
bufferAccessor.Index++;
}
// Write custom properties
foreach (var property in ComputedProperties)
{
bufferAccessor.Index = 0;
property.ComputeProperties(pool, bufferAccessor);
}
}
n.InstanceCount = pool.AliveParticles.Count;
UpdateParticles();
}
/// <summary> /// Compute particle properties based on their phase /// </summary> /// <param name="pool">Pool of particles to process</param> /// <param name="bufferAccessor">RenderData that receives the properties, the accessor will be reset to 0</param> public abstract void ComputeProperties(ParticlePool pool, ParticleBufferAccessor bufferAccessor);