//called from SimBuffer
public void Blit(ref CommandBuffer cBuffer, ref RenderTexture sourcePosRT, ref RenderTexture destPosRT)
{
//get temp RT
for (int i = 0; i < tempRT.Length; i++)
{
tempRT[i] = SimBuffer.GetTempRT(destPosRT);
}
//init mpb positionRT;
for (int i = 0; i < sim.maxSpringConvergenceID; i++)
{
if (i == 0)
{
mpb[i].SetTexture(ID_PositionRT, sourcePosRT);
}
else
{
mpb[i].SetTexture(ID_PositionRT, tempRT[i - 1]);
}
}
for (int i = 0; i < sim.maxSpringConvergenceID; i++)
{
if (i == sim.maxSpringConvergenceID - 1)
{
cBuffer.SetRenderTarget(destPosRT); //if it is the last step, blit into the final dest rt
}
else
{
cBuffer.SetRenderTarget(tempRT[i]);
}
cBuffer.DrawMesh(SimBuffer.quadMesh, Matrix4x4.identity, GPUVerletIntegrator.springMtl, 0, -1, mpb[i]);
}
}
public static SimBuffer Create(Simulation sim)
{
int x, y;
float u;
if (sim.maxAngleConvergenceID <= 0 || sim.maxAngleConvergenceID <= 0)
{
Debug.LogError("The simualtion does not have correct convergence group, GPU solver cannot be created!");
return(null);
}
if (!SimBuffer.GetTexDimension(sim.numberOfParticles(), out x, out y, out u))
{
Debug.LogError("Cannot create GPU rendertexture with wrong dimension");
return(null);
}
return(new SimBuffer(x, y, sim));
}
//called from SimBuffer
public void Blit(ref CommandBuffer cBuffer, ref RenderTexture sourcePosRT, ref RenderTexture destPosRT)
{
//get temp RT
for (int i = 0; i < tempRT.Length; i++)
{
tempRT[i] = SimBuffer.GetTempRT(destPosRT);
}
for (int i = 0; i < tempDeltaRT.Length; i++)
{
tempDeltaRT[i] = SimBuffer.GetTempRT(deltaRTWidth, deltaRTHeight, RTFormat.R);
}
//init mpb positionRT;
for (int i = 0; i < sim.maxAngleConvergenceID; i++)
{
if (i == 0)
{
mpb[i].SetTexture(ID_PositionRT, sourcePosRT);
}
else
{
mpb[i].SetTexture(ID_PositionRT, tempRT[i - 1]);
}
mpb[i].SetTexture(ID_AngleDeltaRT, tempDeltaRT[i]);
}
for (int i = 0; i < sim.maxAngleConvergenceID; i++)
{
//get the delta
cBuffer.SetRenderTarget(tempDeltaRT[i]);
cBuffer.DrawMesh(deltaMesh[i], Matrix4x4.identity, GPUVerletIntegrator.angleDeltaMtl, 0, -1, mpb[i]);
//apply delta
if (i == sim.maxAngleConvergenceID - 1)
{
cBuffer.SetRenderTarget(destPosRT); //if it is the last step, blit into the final dest rt
}
else
{
cBuffer.SetRenderTarget(tempRT[i]);
}
cBuffer.DrawMesh(SimBuffer.quadMesh, Matrix4x4.identity, GPUVerletIntegrator.angleMtl, 0, -1, mpb[i]);
}
}
public GPUVerletIntegrator(Simulation sim) : base(sim)
{
//remember to add these shader in the pre loaded assets
if (springMtl == null)
{
springMtl = new Material(Shader.Find("ParticlePhysics2D/Spring"));
}
if (angleMtl == null)
{
angleMtl = new Material(Shader.Find("ParticlePhysics2D/Angle"));
}
if (verletMtl == null)
{
verletMtl = new Material(Shader.Find("ParticlePhysics2D/VerletGPUIntegrator"));
}
if (angleDeltaMtl == null)
{
angleDeltaMtl = new Material(Shader.Find("ParticlePhysics2D/AngleDelta"));
}
simbuffer = SimBuffer.Create(sim);
eof = new WaitForEndOfFrame();
}
public SimBuffer_Angle(Simulation sim, Vector2[] particleUV, int width, int height)
{
this.sim = sim;
int angleNum = sim.numberOfAngleConstraints();
int parNum = sim.numberOfParticles();
//angle uv
float usage = 0f;
if (!SimBuffer.GetTexDimension(angleNum, out deltaRTWidth, out deltaRTHeight, out usage))
{
Debug.LogError("Cannot create SimBuffer Angle deltaw rt with wrong dimesnion!");
return;
}
angleUV = new Vector2[angleNum];
int count = 0;
float halfW = 0.5f / deltaRTWidth;
float halfH = 0.5f / deltaRTHeight;
for (int y = 0; y < deltaRTHeight; y++)
{
for (int x = 0; x < deltaRTWidth; x++)
{
if (count < angleNum)
{
angleUV[count] = new Vector2((float)x / (float)deltaRTWidth + halfW, (float)y / (float)deltaRTHeight + halfH);
}
count++;
}
}
tempRT = new RenderTexture[sim.maxAngleConvergenceID - 1];
tempDeltaRT = new RenderTexture[sim.maxAngleConvergenceID];
paramRT = new RenderTexture[sim.maxAngleConvergenceID];
deltaMesh = new Mesh[sim.maxAngleConvergenceID];
ID_AngleParamRT = Shader.PropertyToID("_AngleParamRT");
ID_AngleConstant = Shader.PropertyToID("_AngleConstant");
ID_PositionRT = Shader.PropertyToID("_PositionRT");
ID_AngleDeltaRT = Shader.PropertyToID("_AngleDeltaRT");
//rg = the other end point's uv, ba = uv in the delta rt
Color[] paramRTColor = new Color[width * height];
Texture2D tempTex = new Texture2D(width, height, TextureFormat.RGBAFloat, false, false);
for (int i = 0; i < sim.maxAngleConvergenceID; i++)
{
//delta mesh
int agbyid = sim.numberOfAnglesByConvID(i + 1);
deltaMesh[i] = SimBuffer.PointMesh(agbyid);
List <Vector3> vtc = new List <Vector3> (agbyid); //xy = a uv,y=fixedangle
List <Color> cl = new List <Color> (agbyid); //rg=b uv,ba = m uv;
List <Vector2> uv = new List <Vector2> (agbyid); //delta rt uv;
//init rt
paramRT[i] = new RenderTexture(width, height, 0, RTFormat.ARGB);
paramRT[i].Create();
//prepare temp color
for (int k = 0; k < width * height; k++)
{
if (k < parNum)
{
Vector2 puv = particleUV[k];
paramRTColor[k] = new Color(puv.x, puv.y, 0f, 0f); //rg = other end,ba = uv in deltart
}
else
{
paramRTColor[k] = Color.clear;
}
}
//get info
for (int j = 0; j < angleNum; j++)
{
AngleConstraint2D ag = sim.getAngleConstraint(j);
if (ag.convergenceGroupID == i + 1)
{
int a = sim.getParticleIndex(ag.ParticleB);
int b = sim.getParticleIndex(ag.ParticleM);
int aIndex = sim.getParticleIndex(ag.ParticleA);
//if it's free, rg = the other end's uv, else = own uv
if (ag.ParticleB.IsFree)
{
paramRTColor[a].r = particleUV[b].x;
paramRTColor[a].g = particleUV[b].y;
}
if (ag.ParticleM.IsFree)
{
paramRTColor[b].r = particleUV[a].x;
paramRTColor[b].g = particleUV[a].y;
}
paramRTColor[a].b = paramRTColor[b].b = angleUV[j].x;
paramRTColor[a].a = paramRTColor[b].a = angleUV[j].y;
//mesh vtc and cl
vtc.Add(new Vector3(angleUV[j].x, angleUV[j].y, ag.angle_Fixed));
uv.Add(particleUV[aIndex]);
cl.Add(new Color(particleUV[a].x, particleUV[a].y, particleUV[b].x, particleUV[b].y));
}
}
//blit
tempTex.SetPixels(paramRTColor);
tempTex.Apply();
Graphics.Blit(tempTex, paramRT[i]);
//delta mesh
deltaMesh[i].vertices = vtc.ToArray();
deltaMesh[i].colors = cl.ToArray();
deltaMesh[i].uv = uv.ToArray();
//deltaMesh[i].UploadMeshData(true);
}
Extension.ObjDestroy(tempTex);
//mpb
mpb = new MaterialPropertyBlock[sim.maxSpringConvergenceID];
for (int i = 0; i < sim.maxAngleConvergenceID; i++)
{
mpb[i] = new MaterialPropertyBlock();
mpb[i].SetTexture(ID_AngleParamRT, paramRT[i]);
mpb[i].SetFloat(ID_AngleConstant, sim.Settings.angleConstant);
}
}