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MSTRINGIFY(
__kernel void
updateVelocitiesFromPositionsWithVelocitiesKernel(
int numNodes,
float isolverdt,
__global float4 * g_vertexPositions,
__global float4 * g_vertexPreviousPositions,
__global int * g_vertexClothIndices,
__global float *g_clothVelocityCorrectionCoefficients,
__global float * g_clothDampingFactor,
__global float4 * g_vertexVelocities,
__global float4 * g_vertexForces GUID_ARG)
{
int nodeID = get_global_id(0);
if( nodeID < numNodes )
{
float4 position = g_vertexPositions[nodeID];
float4 previousPosition = g_vertexPreviousPositions[nodeID];
float4 velocity = g_vertexVelocities[nodeID];
int clothIndex = g_vertexClothIndices[nodeID];
float velocityCorrectionCoefficient = g_clothVelocityCorrectionCoefficients[clothIndex];
float dampingFactor = g_clothDampingFactor[clothIndex];
float velocityCoefficient = (1.f - dampingFactor);
float4 difference = position - previousPosition;
velocity += difference*velocityCorrectionCoefficient*isolverdt;
// Damp the velocity
velocity *= velocityCoefficient;
g_vertexVelocities[nodeID] = velocity;
g_vertexForces[nodeID] = (float4)(0.f, 0.f, 0.f, 0.f);
}
}
);
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