void ReferenceCalcDrudeForceKernel::initialize(const System& system, const DrudeForce& force) { // Initialize particle parameters. int numParticles = force.getNumParticles(); particle.resize(numParticles); particle1.resize(numParticles); particle2.resize(numParticles); particle3.resize(numParticles); particle4.resize(numParticles); charge.resize(numParticles); polarizability.resize(numParticles); aniso12.resize(numParticles); aniso34.resize(numParticles); for (int i = 0; i < numParticles; i++) force.getParticleParameters(i, particle[i], particle1[i], particle2[i], particle3[i], particle4[i], charge[i], polarizability[i], aniso12[i], aniso34[i]); // Initialize screened pair parameters. int numPairs = force.getNumScreenedPairs(); pair1.resize(numPairs); pair2.resize(numPairs); pairThole.resize(numPairs); for (int i = 0; i < numPairs; i++) force.getScreenedPairParameters(i, pair1[i], pair2[i], pairThole[i]); }
void CudaCalcDrudeForceKernel::copyParametersToContext(ContextImpl& context, const DrudeForce& force) { int numContexts = cu.getPlatformData().contexts.size(); // Set the particle parameters. int startParticleIndex = cu.getContextIndex()*force.getNumParticles()/numContexts; int endParticleIndex = (cu.getContextIndex()+1)*force.getNumParticles()/numContexts; int numParticles = endParticleIndex-startParticleIndex; if (numParticles > 0) { if (particleParams == NULL || numParticles != particleParams->getSize()) throw OpenMMException("updateParametersInContext: The number of Drude particles has changed"); vector<float4> paramVector(numParticles); for (int i = 0; i < numParticles; i++) { int p, p1, p2, p3, p4; double charge, polarizability, aniso12, aniso34; force.getParticleParameters(startParticleIndex+i, p, p1, p2, p3, p4, charge, polarizability, aniso12, aniso34); double a1 = (p2 == -1 ? 1 : aniso12); double a2 = (p3 == -1 || p4 == -1 ? 1 : aniso34); double a3 = 3-a1-a2; double k3 = ONE_4PI_EPS0*charge*charge/(polarizability*a3); double k1 = ONE_4PI_EPS0*charge*charge/(polarizability*a1) - k3; double k2 = ONE_4PI_EPS0*charge*charge/(polarizability*a2) - k3; if (p2 == -1) k1 = 0; if (p3 == -1 || p4 == -1) k2 = 0; paramVector[i] = make_float4((float) k1, (float) k2, (float) k3, 0.0f); } particleParams->upload(paramVector); } // Set the pair parameters. int startPairIndex = cu.getContextIndex()*force.getNumScreenedPairs()/numContexts; int endPairIndex = (cu.getContextIndex()+1)*force.getNumScreenedPairs()/numContexts; int numPairs = endPairIndex-startPairIndex; if (numPairs > 0) { if (pairParams == NULL || numPairs != pairParams->getSize()) throw OpenMMException("updateParametersInContext: The number of screened pairs has changed"); vector<float2> paramVector(numPairs); for (int i = 0; i < numPairs; i++) { int drude1, drude2; double thole; force.getScreenedPairParameters(startPairIndex+i, drude1, drude2, thole); int p, p1, p2, p3, p4; double charge1, charge2, polarizability1, polarizability2, aniso12, aniso34; force.getParticleParameters(drude1, p, p1, p2, p3, p4, charge1, polarizability1, aniso12, aniso34); force.getParticleParameters(drude2, p, p1, p2, p3, p4, charge2, polarizability2, aniso12, aniso34); double screeningScale = thole/pow(polarizability1*polarizability2, 1.0/6.0); double energyScale = ONE_4PI_EPS0*charge1*charge2; paramVector[i] = make_float2((float) screeningScale, (float) energyScale); } pairParams->upload(paramVector); } }
void ReferenceCalcDrudeForceKernel::copyParametersToContext(ContextImpl& context, const DrudeForce& force) { if (force.getNumParticles() != particle.size()) throw OpenMMException("updateParametersInContext: The number of Drude particles has changed"); if (force.getNumScreenedPairs() != pair1.size()) throw OpenMMException("updateParametersInContext: The number of screened pairs has changed"); for (int i = 0; i < force.getNumParticles(); i++) { int p, p1, p2, p3, p4; force.getParticleParameters(i, p, p1, p2, p3, p4, charge[i], polarizability[i], aniso12[i], aniso34[i]); if (p != particle[i] || p1 != particle1[i] || p2 != particle2[i] || p3 != particle3[i] || p4 != particle4[i]) throw OpenMMException("updateParametersInContext: A particle index has changed"); } for (int i = 0; i < force.getNumScreenedPairs(); i++) { int p1, p2; force.getScreenedPairParameters(i, p1, p2, pairThole[i]); if (p1 != pair1[i] || p2 != pair2[i]) throw OpenMMException("updateParametersInContext: A particle index for a screened pair has changed"); } }
void CudaCalcDrudeForceKernel::initialize(const System& system, const DrudeForce& force) { cu.setAsCurrent(); int numContexts = cu.getPlatformData().contexts.size(); int startParticleIndex = cu.getContextIndex()*force.getNumParticles()/numContexts; int endParticleIndex = (cu.getContextIndex()+1)*force.getNumParticles()/numContexts; int numParticles = endParticleIndex-startParticleIndex; if (numParticles > 0) { // Create the harmonic interaction . vector<vector<int> > atoms(numParticles, vector<int>(5)); particleParams = CudaArray::create<float4>(cu, numParticles, "drudeParticleParams"); vector<float4> paramVector(numParticles); for (int i = 0; i < numParticles; i++) { double charge, polarizability, aniso12, aniso34; force.getParticleParameters(startParticleIndex+i, atoms[i][0], atoms[i][1], atoms[i][2], atoms[i][3], atoms[i][4], charge, polarizability, aniso12, aniso34); double a1 = (atoms[i][2] == -1 ? 1 : aniso12); double a2 = (atoms[i][3] == -1 || atoms[i][4] == -1 ? 1 : aniso34); double a3 = 3-a1-a2; double k3 = ONE_4PI_EPS0*charge*charge/(polarizability*a3); double k1 = ONE_4PI_EPS0*charge*charge/(polarizability*a1) - k3; double k2 = ONE_4PI_EPS0*charge*charge/(polarizability*a2) - k3; if (atoms[i][2] == -1) { atoms[i][2] = 0; k1 = 0; } if (atoms[i][3] == -1 || atoms[i][4] == -1) { atoms[i][3] = 0; atoms[i][4] = 0; k2 = 0; } paramVector[i] = make_float4((float) k1, (float) k2, (float) k3, 0.0f); } particleParams->upload(paramVector); map<string, string> replacements; replacements["PARAMS"] = cu.getBondedUtilities().addArgument(particleParams->getDevicePointer(), "float4"); cu.getBondedUtilities().addInteraction(atoms, cu.replaceStrings(CudaDrudeKernelSources::drudeParticleForce, replacements), force.getForceGroup()); } int startPairIndex = cu.getContextIndex()*force.getNumScreenedPairs()/numContexts; int endPairIndex = (cu.getContextIndex()+1)*force.getNumScreenedPairs()/numContexts; int numPairs = endPairIndex-startPairIndex; if (numPairs > 0) { // Create the screened interaction between dipole pairs. vector<vector<int> > atoms(numPairs, vector<int>(4)); pairParams = CudaArray::create<float2>(cu, numPairs, "drudePairParams"); vector<float2> paramVector(numPairs); for (int i = 0; i < numPairs; i++) { int drude1, drude2; double thole; force.getScreenedPairParameters(startPairIndex+i, drude1, drude2, thole); int p2, p3, p4; double charge1, charge2, polarizability1, polarizability2, aniso12, aniso34; force.getParticleParameters(drude1, atoms[i][0], atoms[i][1], p2, p3, p4, charge1, polarizability1, aniso12, aniso34); force.getParticleParameters(drude2, atoms[i][2], atoms[i][3], p2, p3, p4, charge2, polarizability2, aniso12, aniso34); double screeningScale = thole/pow(polarizability1*polarizability2, 1.0/6.0); double energyScale = ONE_4PI_EPS0*charge1*charge2; paramVector[i] = make_float2((float) screeningScale, (float) energyScale); } pairParams->upload(paramVector); map<string, string> replacements; replacements["PARAMS"] = cu.getBondedUtilities().addArgument(pairParams->getDevicePointer(), "float2"); cu.getBondedUtilities().addInteraction(atoms, cu.replaceStrings(CudaDrudeKernelSources::drudePairForce, replacements), force.getForceGroup()); } cu.addForce(new CudaDrudeForceInfo(force)); }