src/BulletMultiThreaded/GpuSoftBodySolvers/OpenCL/OpenCLC10/UpdatePositions.cl

   1 MSTRINGIFY(\r
   2 \r
   3 __kernel void \r
   4 updateVelocitiesFromPositionsWithoutVelocitiesKernel( \r
   5         const int numNodes,\r
   6         const float isolverdt,\r
   7         __global float4 * g_vertexPositions,\r
   8         __global float4 * g_vertexPreviousPositions,\r
   9         __global int * g_vertexClothIndices,\r
  10         __global float * g_clothDampingFactor,\r
  11         __global float4 * g_vertexVelocities,\r
  12         __global float4 * g_vertexForces GUID_ARG)\r
  13 \r
  14 {\r
  15         int nodeID = get_global_id(0);\r
  16         if( nodeID < numNodes )\r
  17         {       \r
  18                 float4 position = g_vertexPositions[nodeID];\r
  19                 float4 previousPosition = g_vertexPreviousPositions[nodeID];\r
  20                 float4 velocity = g_vertexVelocities[nodeID];\r
  21                 int clothIndex = g_vertexClothIndices[nodeID];\r
  22                 float dampingFactor = g_clothDampingFactor[clothIndex];\r
  23                 float velocityCoefficient = (1.f - dampingFactor);\r
  24                 \r
  25                 float4 difference = position - previousPosition;\r
  26                                 \r
  27                 velocity = difference*velocityCoefficient*isolverdt;            \r
  28                 \r
  29                 g_vertexVelocities[nodeID] = velocity;\r
  30                 g_vertexForces[nodeID] = (float4)(0.f, 0.f, 0.f, 0.f);                                                          \r
  31         }\r
  32 }\r
  33 \r
  34 );