TEST(LinearSolverTests, IncompletePoisson_Simple_PCG)
{
glm::ivec2 size(50);
FluidSim sim;
sim.initialize(1.0f, size.x, size.y);
sim.set_boundary(boundary_phi);
AddParticles(size, sim, boundary_phi);
sim.add_force(0.01f);
sim.compute_phi();
sim.extrapolate_phi();
sim.apply_projection(0.01f);
LinearSolver::Data data(*device, size, VMA_MEMORY_USAGE_CPU_ONLY);
BuildLinearEquation(size, data.Diagonal, data.Lower, data.B, sim);
IncompletePoisson preconditioner(*device, size);
LinearSolver::Parameters params(LinearSolver::Parameters::SolverType::Iterative, 1000, 1e-5f);
ConjugateGradient solver(*device, size, preconditioner);
solver.Bind(data.Diagonal, data.Lower, data.B, data.X);
solver.Solve(params);
device->Queue().waitIdle();
CheckPressure(size, sim.pressure, data.X, 1e-5f);
std::cout << "Solved with number of iterations: " << params.OutIterations << std::endl;
}
TEST(LinearSolverTests, LocalGaussSeidel)
{
glm::ivec2 size(16); // maximum size
FluidSim sim;
sim.initialize(1.0f, size.x, size.y);
sim.set_boundary(boundary_phi);
AddParticles(size, sim, boundary_phi);
sim.add_force(0.01f);
sim.compute_phi();
sim.extrapolate_phi();
sim.apply_projection(0.01f);
LinearSolver::Data data(*device, size, VMA_MEMORY_USAGE_CPU_ONLY);
BuildLinearEquation(size, data.Diagonal, data.Lower, data.B, sim);
LocalGaussSeidel solver(*device, size);
solver.Bind(data.Diagonal, data.Lower, data.B, data.X);
device->Execute([&](vk::CommandBuffer commandBuffer) { solver.Record(commandBuffer); });
device->Queue().waitIdle();
CheckPressure(size, sim.pressure, data.X, 1e-3f);
}
TEST(LinearSolverTests, Multigrid_Simple_PCG)
{
glm::ivec2 size(64);
FluidSim sim;
sim.initialize(1.0f, size.x, size.y);
sim.set_boundary(boundary_phi);
AddParticles(size, sim, boundary_phi);
sim.add_force(0.01f);
sim.compute_phi();
sim.extrapolate_phi();
sim.apply_projection(0.01f);
LinearSolver::Data data(*device, size, VMA_MEMORY_USAGE_CPU_ONLY);
Velocity velocity(*device, size);
Texture liquidPhi(*device, size.x, size.y, vk::Format::eR32Sfloat);
Texture solidPhi(*device, size.x, size.y, vk::Format::eR32Sfloat);
Buffer<glm::ivec2> valid(*device, size.x * size.y, VMA_MEMORY_USAGE_CPU_ONLY);
SetSolidPhi(*device, size, solidPhi, sim, (float)size.x);
SetLiquidPhi(*device, size, liquidPhi, sim, (float)size.x);
BuildLinearEquation(size, data.Diagonal, data.Lower, data.B, sim);
Pressure pressure(*device, 0.01f, size, data, velocity, solidPhi, liquidPhi, valid);
Multigrid preconditioner(*device, size, 0.01f);
preconditioner.BuildHierarchiesBind(pressure, solidPhi, liquidPhi);
LinearSolver::Parameters params(LinearSolver::Parameters::SolverType::Iterative, 1000, 1e-5f);
ConjugateGradient solver(*device, size, preconditioner);
solver.Bind(data.Diagonal, data.Lower, data.B, data.X);
preconditioner.BuildHierarchies();
solver.Solve(params);
device->Queue().waitIdle();
CheckPressure(size, sim.pressure, data.X, 1e-5f);
std::cout << "Solved with number of iterations: " << params.OutIterations << std::endl;
}