1 files changed, 21 insertions, 0 deletions
diff --git a/Source/Filter/Filter_Kernels.H b/Source/Filter/Filter_Kernels.H
new file mode 100644
index 000000000..ccd5a89f9
--- /dev/null
+++ b/Source/Filter/Filter_Kernels.H
@@ -0,0 +1,21 @@
+#ifndef WARPX_K_H_
+#define WARPX_K_H_
+
+#include "cstdlib"
+#include <AMReX_FArrayBox.H>
+
+using namespace amrex;
+
+AMREX_GPU_HOST_DEVICE AMREX_INLINE
+
+void warpx_apply_filter_2d (int j, int k, int l, Array4<Real> const& dst, Array4<const Real> const& src,
+                            Vector<Real> const& stencil_x, Vector<Real> const& stencil_z,
+                            int nx, int nz)
+{
+    for (int ix=-nx+1; ix<nx; ix++){
+    for (int iz=-nz+1; iz<nz; iz++){
+        dst(j,k,0) = src(j,k,0) + stencil_x[abs(ix)]*stencil_z[abs(iz)]*src(j+ix,k+iz,0);
+    }
+    }
+}
+#endif