extensions/gdx-bullet/jni/src/bullet/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/UpdateNodes.hlsl

   1 MSTRINGIFY(
   2
   3 cbuffer UpdateVelocitiesFromPositionsWithVelocitiesCB : register( b0 )
   4 {
   5         int numNodes;
   6         float isolverdt;
   7         int padding1;
   8         int padding2;
   9 };
  10
  11
  12 StructuredBuffer<float4> g_vertexPositions : register( t0 );
  13 StructuredBuffer<float4> g_vertexPreviousPositions : register( t1 );
  14 StructuredBuffer<int> g_vertexClothIndices : register( t2 );
  15 StructuredBuffer<float> g_clothVelocityCorrectionCoefficients : register( t3 );
  16 StructuredBuffer<float> g_clothDampingFactor : register( t4 );
  17
  18 RWStructuredBuffer<float4> g_vertexVelocities : register( u0 );
  19 RWStructuredBuffer<float4> g_vertexForces : register( u1 );
  20
  21
  22 [numthreads(128, 1, 1)]
  23 void
  24 updateVelocitiesFromPositionsWithVelocitiesKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
  25 {
  26         int nodeID = DTid.x;
  27         if( nodeID < numNodes )
  28         {
  29                 float3 position = g_vertexPositions[nodeID].xyz;
  30                 float3 previousPosition = g_vertexPreviousPositions[nodeID].xyz;
  31                 float3 velocity = g_vertexVelocities[nodeID].xyz;
  32                 int clothIndex = g_vertexClothIndices[nodeID];
  33                 float velocityCorrectionCoefficient = g_clothVelocityCorrectionCoefficients[clothIndex];
  34                 float dampingFactor = g_clothDampingFactor[clothIndex];
  35                 float velocityCoefficient = (1.f - dampingFactor);
  36
  37                 float3 difference = position - previousPosition;
  38
  39                 velocity += difference*velocityCorrectionCoefficient*isolverdt;
  40
  41                 // Damp the velocity
  42                 velocity *= velocityCoefficient;
  43
  44                 g_vertexVelocities[nodeID] = float4(velocity, 0.f);
  45                 g_vertexForces[nodeID] = float4(0.f, 0.f, 0.f, 0.f);
  46         }
  47 }
  48
  49 );