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Viewing changes to tests/bullet/src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/VSolveLinks.hlsl

  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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tests/bullet/src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/VSolveLinks.hlsl
 
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MSTRINGIFY(
 
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cbuffer VSolveLinksCB : register( b0 )
 
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{
 
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        int startLink;
 
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        int numLinks;
 
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        float kst;
 
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        int padding;
 
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};
 
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// Node indices for each link
 
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StructuredBuffer<int2> g_linksVertexIndices : register( t0 );
 
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StructuredBuffer<float> g_linksLengthRatio : register( t1 );
 
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StructuredBuffer<float4> g_linksCurrentLength : register( t2 );
 
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StructuredBuffer<float> g_vertexInverseMass : register( t3 );
 
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RWStructuredBuffer<float4> g_vertexVelocity : register( u0 );
 
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[numthreads(128, 1, 1)]
 
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void 
 
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VSolveLinksKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
 
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{
 
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        int linkID = DTid.x + startLink;
 
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        if( DTid.x < numLinks )
 
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        {               
 
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                int2 nodeIndices = g_linksVertexIndices[linkID];
 
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                int node0 = nodeIndices.x;
 
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                int node1 = nodeIndices.y;
 
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                float linkLengthRatio = g_linksLengthRatio[linkID];
 
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                float3 linkCurrentLength = g_linksCurrentLength[linkID].xyz;
 
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                float3 vertexVelocity0 = g_vertexVelocity[node0].xyz;
 
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                float3 vertexVelocity1 = g_vertexVelocity[node1].xyz;
 
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                float vertexInverseMass0 = g_vertexInverseMass[node0];
 
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                float vertexInverseMass1 = g_vertexInverseMass[node1]; 
 
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                float3 nodeDifference = vertexVelocity0 - vertexVelocity1;
 
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                float dotResult = dot(linkCurrentLength, nodeDifference);
 
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                float j = -dotResult*linkLengthRatio*kst;
 
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                float3 velocityChange0 = linkCurrentLength*(j*vertexInverseMass0);
 
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                float3 velocityChange1 = linkCurrentLength*(j*vertexInverseMass1);
 
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                vertexVelocity0 += velocityChange0;
 
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                vertexVelocity1 -= velocityChange1;
 
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                g_vertexVelocity[node0] = float4(vertexVelocity0, 0.f);
 
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                g_vertexVelocity[node1] = float4(vertexVelocity1, 0.f);
 
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        }
 
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}
 
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);
 
 
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