src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/PrepareLinks.hlsl

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