public override void Init(ComputeBuffer buffer)
{
if (stateBuffer != null)
{
Clear();
}
GPUParticle[] particles = new GPUParticle[buffer.count];
buffer.GetData(particles);
var count = particles.Length;
var step = 1f / Mathf.Pow(count, 1f / 3f);
stateBuffer = new ComputeBuffer(count, Marshal.SizeOf(typeof(State)));
var states = new State[count];
for (int i = 0; i < count; i++)
{
var p = particles[i];
states[i] = new State(p.pos, p.pos, Random.value, Random.value < ratio ? true : false);
}
stateBuffer.SetData(states);
shader.SetFloat("_Step", step);
shader.SetBuffer(0, "_States", stateBuffer);
}
protected void Start()
{
var sideCount = Mathf.FloorToInt(Mathf.Pow(vertexCount, 1f / 3f));
var count = sideCount * sideCount * sideCount;
var dsideCount = sideCount * sideCount;
particles = new GPUParticle[count];
var scale = (1f / sideCount);
var offset = -Vector3.one * 0.5f;
for (int x = 0; x < sideCount; x++)
{
var xoffset = x * dsideCount;
for (int y = 0; y < sideCount; y++)
{
var yoffset = y * sideCount;
for (int z = 0; z < sideCount; z++)
{
var index = xoffset + yoffset + z;
var particle = new GPUParticle(Random.Range(0.5f, 1f), new Vector3(x, y, z) * scale + offset, Quaternion.identity, Vector3.one, Vector3.zero, Vector3.zero, Color.white);
particles[index] = particle;
}
}
}
particleDisplayMat.SetFloat("_Size", scale);
// particleDisplayMat.SetColor("_LightColor", Color.white);
// particleDisplayMat.SetFloat("_LightIntensity", 1f);
mesh = Build(sideCount);
}
void Setup(GPUParticleSystem system)
{
var buffer = system.ParticleBuffer;
GPUParticle[] particles = new GPUParticle[buffer.count];
buffer.GetData(particles);
var count = particles.Length;
bounds = new List <GPUBound>();
Bintree(Vector3.zero, Vector3.one, depth);
boundsBuffer = new ComputeBuffer(bounds.Count, Marshal.SizeOf(typeof(GPUBound_t)));
boundsBuffer.SetData(bounds.Select(b => b.Structure()).ToArray());
boundsReferencesBuffer = new ComputeBuffer(count, Marshal.SizeOf(typeof(int)));
var kernel = shader.FindKernel("Octree");
shader.SetBuffer(kernel, "_Bounds", boundsBuffer);
shader.SetInt("_BoundsCount", bounds.Count);
shader.SetBuffer(kernel, "_BoundsReferences", boundsReferencesBuffer);
Dispatch(kernel, system);
shader.SetBuffer(0, "_BoundsReferences", boundsReferencesBuffer);
}
void Setup(ComputeBuffer buffer)
{
GPUParticle[] particles = new GPUParticle[buffer.count];
buffer.GetData(particles);
var count = particles.Length;
fromBuffer = new ComputeBuffer(count, Marshal.SizeOf(typeof(TRS)));
toBuffer = new ComputeBuffer(count, Marshal.SizeOf(typeof(TRS)));
var from = new TRS[count];
var to = new TRS[count];
var q = Quaternion.identity;
var s = Vector3.one;
for (int i = 0; i < count; i++)
{
var p = particles[i];
from[i] = new TRS(p.pos, p.rot, p.scale);
to[i] = new TRS(p.origin, q, s);
}
fromBuffer.SetData(from);
toBuffer.SetData(to);
shader.SetBuffer(0, "_From", fromBuffer);
shader.SetBuffer(0, "_To", toBuffer);
}
