Engine/lib/bullet/src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/UpdatePositionsFromVelocities.hlsl

   1 MSTRINGIFY(
   2
   3 cbuffer UpdatePositionsFromVelocitiesCB : register( b0 )
   4 {
   5         int numNodes;
   6         float solverSDT;
   7         int padding1;
   8         int padding2;
   9 };
  10
  11
  12 StructuredBuffer<float4> g_vertexVelocities : register( t0 );
  13
  14 RWStructuredBuffer<float4> g_vertexPreviousPositions : register( u0 );
  15 RWStructuredBuffer<float4> g_vertexCurrentPosition : register( u1 );
  16
  17
  18 [numthreads(128, 1, 1)]
  19 void
  20 UpdatePositionsFromVelocitiesKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
  21 {
  22         int vertexID = DTid.x;
  23         if( vertexID < numNodes )
  24         {
  25                 float3 previousPosition = g_vertexPreviousPositions[vertexID].xyz;
  26                 float3 velocity = g_vertexVelocities[vertexID].xyz;
  27
  28                 float3 newPosition = previousPosition + velocity*solverSDT;
  29
  30                 g_vertexCurrentPosition[vertexID] = float4(newPosition, 0.f);
  31                 g_vertexPreviousPositions[vertexID] = float4(newPosition, 0.f);
  32         }
  33 }
  34
  35 );