feat(initial): added portable mfem build system

2026-09-05 07:11:05 -04:00
commit 6a54f2625e
49 changed files with 4344 additions and 0 deletions
--- a/examples/serial_poisson.cpp
+++ b/examples/serial_poisson.cpp
@@ -0,0 +1,81 @@
+#include <meson_mfem_template/config.hpp>
+#include <mfem.hpp>
+
+#include <cmath>
+#include <iostream>
+
+int main(int argc, char **argv)
+{
+   const char *device_name = argc > 1 ? argv[1] :
+#if MESON_MFEM_HAS_CEED && !defined(__EMSCRIPTEN__)
+                             "ceed-cpu";
+#else
+                             "cpu";
+#endif
+   mfem::Device device(device_name);
+
+   mfem::Mesh mesh = mfem::Mesh::MakeCartesian2D(
+      6, 6, mfem::Element::QUADRILATERAL, true, 1.0, 1.0);
+   const int dimension = mesh.Dimension();
+   mfem::H1_FECollection elements(2, dimension);
+   mfem::FiniteElementSpace space(&mesh, &elements);
+
+   mfem::Array<int> essential_boundary(mesh.bdr_attributes.Max());
+   essential_boundary = 1;
+   mfem::Array<int> essential_dofs;
+   space.GetEssentialTrueDofs(essential_boundary, essential_dofs);
+
+   mfem::ConstantCoefficient one(1.0);
+   mfem::LinearForm rhs(&space);
+   rhs.AddDomainIntegrator(new mfem::DomainLFIntegrator(one));
+   rhs.Assemble();
+
+   mfem::GridFunction solution(&space);
+   solution = 0.0;
+
+   mfem::BilinearForm diffusion(&space);
+   diffusion.AddDomainIntegrator(new mfem::DiffusionIntegrator(one));
+   if (mfem::Device::Allows(mfem::Backend::CEED_MASK))
+   {
+      diffusion.SetAssemblyLevel(mfem::AssemblyLevel::PARTIAL);
+   }
+   diffusion.Assemble();
+
+   mfem::OperatorPtr matrix;
+   mfem::Vector linear_rhs;
+   mfem::Vector linear_solution;
+   diffusion.FormLinearSystem(
+      essential_dofs, solution, rhs, matrix, linear_solution, linear_rhs);
+
+   mfem::CGSolver solver;
+   solver.SetOperator(*matrix);
+   solver.SetRelTol(1e-12);
+   solver.SetAbsTol(0.0);
+   solver.SetMaxIter(200);
+   solver.SetPrintLevel(0);
+   solver.Mult(linear_rhs, linear_solution);
+   diffusion.RecoverFEMSolution(linear_solution, rhs, solution);
+
+#if MESON_MFEM_HAS_FMS
+   mfem::FMSDataCollection fms_collection("meson-mfem-smoke", &mesh);
+   fms_collection.SetProtocol("ascii");
+#endif
+
+#if MESON_MFEM_HAS_ALGOIM
+   mfem::FunctionCoefficient level_set(
+      [](const mfem::Vector &point) { return point[0] + point[1] - 0.2; });
+   mfem::AlgoimIntegrationRules algoim_rules(2, level_set, 2);
+   mfem::IntegrationRule cut_rule;
+   algoim_rules.GetVolumeIntegrationRule(
+      *mesh.GetElementTransformation(0), cut_rule);
+   if (cut_rule.GetNPoints() == 0)
+   {
+      return 3;
+   }
+#endif
+
+   const double norm = solution.Norml2();
+   std::cout << "MFEM serial Poisson: dofs=" << space.GetTrueVSize()
+             << " l2=" << norm << " device=" << device_name << '\n';
+   return solver.GetConverged() && std::isfinite(norm) && norm > 0.0 ? 0 : 2;
+}