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watrabi
2025-09-18 17:55:52 -04:00
commit 977f1ff4b8
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App.BulletPhysics/BulletMultiThreaded/GpuSoftBodySolvers/DX11/HLSL/UpdateNormals.hlsl
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MSTRINGIFY(
cbuffer UpdateSoftBodiesCB : register( b0 )
{
unsigned int numNodes;
unsigned int startFace;
unsigned int numFaces;
float epsilon;
};
// Node indices for each link
StructuredBuffer<int4> g_triangleVertexIndexSet : register( t0 );
StructuredBuffer<float4> g_vertexPositions : register( t1 );
StructuredBuffer<int> g_vertexTriangleCount : register( t2 );
RWStructuredBuffer<float4> g_vertexNormals : register( u0 );
RWStructuredBuffer<float> g_vertexArea : register( u1 );
RWStructuredBuffer<float4> g_triangleNormals : register( u2 );
RWStructuredBuffer<float> g_triangleArea : register( u3 );
[numthreads(128, 1, 1)]
void
ResetNormalsAndAreasKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
{
if( DTid.x < numNodes )
{
g_vertexNormals[DTid.x] = float4(0.0f, 0.0f, 0.0f, 0.0f);
g_vertexArea[DTid.x] = 0.0f;
}
}
[numthreads(128, 1, 1)]
void
UpdateSoftBodiesKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
{
int faceID = DTid.x + startFace;
if( DTid.x < numFaces )
{
int4 triangleIndexSet = g_triangleVertexIndexSet[ faceID ];
int nodeIndex0 = triangleIndexSet.x;
int nodeIndex1 = triangleIndexSet.y;
int nodeIndex2 = triangleIndexSet.z;
float3 node0 = g_vertexPositions[nodeIndex0].xyz;
float3 node1 = g_vertexPositions[nodeIndex1].xyz;
float3 node2 = g_vertexPositions[nodeIndex2].xyz;
float3 nodeNormal0 = g_vertexNormals[nodeIndex0].xyz;
float3 nodeNormal1 = g_vertexNormals[nodeIndex1].xyz;
float3 nodeNormal2 = g_vertexNormals[nodeIndex2].xyz;
float vertexArea0 = g_vertexArea[nodeIndex0];
float vertexArea1 = g_vertexArea[nodeIndex1];
float vertexArea2 = g_vertexArea[nodeIndex2];
float3 vector0 = node1 - node0;
float3 vector1 = node2 - node0;
float3 faceNormal = cross(vector0.xyz, vector1.xyz);
float triangleArea = length(faceNormal);
nodeNormal0 = nodeNormal0 + faceNormal;
nodeNormal1 = nodeNormal1 + faceNormal;
nodeNormal2 = nodeNormal2 + faceNormal;
vertexArea0 = vertexArea0 + triangleArea;
vertexArea1 = vertexArea1 + triangleArea;
vertexArea2 = vertexArea2 + triangleArea;
g_triangleNormals[faceID] = float4(normalize(faceNormal), 0.f);
g_vertexNormals[nodeIndex0] = float4(nodeNormal0, 0.f);
g_vertexNormals[nodeIndex1] = float4(nodeNormal1, 0.f);
g_vertexNormals[nodeIndex2] = float4(nodeNormal2, 0.f);
g_triangleArea[faceID] = triangleArea;
g_vertexArea[nodeIndex0] = vertexArea0;
g_vertexArea[nodeIndex1] = vertexArea1;
g_vertexArea[nodeIndex2] = vertexArea2;
}
}
[numthreads(128, 1, 1)]
void
NormalizeNormalsAndAreasKernel( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
{
if( DTid.x < numNodes )
{
float4 normal = g_vertexNormals[DTid.x];
float area = g_vertexArea[DTid.x];
int numTriangles = g_vertexTriangleCount[DTid.x];
float vectorLength = length(normal);
g_vertexNormals[DTid.x] = normalize(normal);
g_vertexArea[DTid.x] = area/float(numTriangles);
}
}
);