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

   1 MSTRINGIFY(
   2
   3 cbuffer PrepareLinksCB : register( b0 )
   4 {
   5         int numLinks;
   6         int padding0;
   7         int padding1;
   8         int padding2;
   9 };
  10
  11 // Node indices for each link
  12 StructuredBuffer<int2> g_linksVertexIndices : register( t0 );
  13 StructuredBuffer<float> g_linksMassLSC : register( t1 );
  14 StructuredBuffer<float4> g_nodesPreviousPosition : register( t2 );
  15
  16 RWStructuredBuffer<float> g_linksLengthRatio : register( u0 );
  17 RWStructuredBuffer<float4> g_linksCurrentLength : register( u1 );
  18
  19 [numthreads(128, 1, 1)]
  20 void
  21 PrepareLinksKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
  22 {
  23         int linkID = DTid.x;
  24         if( linkID < numLinks )
  25         {
  26                 int2 nodeIndices = g_linksVertexIndices[linkID];
  27                 int node0 = nodeIndices.x;
  28                 int node1 = nodeIndices.y;
  29
  30                 float4 nodePreviousPosition0 = g_nodesPreviousPosition[node0];
  31                 float4 nodePreviousPosition1 = g_nodesPreviousPosition[node1];
  32
  33                 float massLSC = g_linksMassLSC[linkID];
  34
  35                 float4 linkCurrentLength = nodePreviousPosition1 - nodePreviousPosition0;
  36
  37                 float linkLengthRatio = dot(linkCurrentLength, linkCurrentLength)*massLSC;
  38                 linkLengthRatio = 1./linkLengthRatio;
  39
  40                 g_linksCurrentLength[linkID] = linkCurrentLength;
  41                 g_linksLengthRatio[linkID] = linkLengthRatio;
  42         }
  43 }
  44 );