Replaced Index function

1 files changed, 22 insertions, 0 deletions

diff --git a/Source/Particles/Sorting/SortingUtils.H b/Source/Particles/Sorting/SortingUtils.H
index d072ebd2a..7dec21446 100644
--- a/Source/Particles/Sorting/SortingUtils.H
+++ b/Source/Particles/Sorting/SortingUtils.H
@@ -15,4 +15,26 @@ void fillWithConsecutiveIntegers( amrex::Gpu::ManagedDeviceVector<long>& v ) {
 #endif
 }
 
+// TODO: Add documentation
+template< typename PType >
+AMREX_GPU_HOST_DEVICE AMREX_INLINE
+amrex::IntVect findParticleIndex ( PType p,
+                    const amrex::Real prob_lo_x,
+                    const amrex::Real prob_lo_y,
+                    const amrex::Real prob_lo_z,
+                    const amrex::Real inv_dx,
+                    const amrex::Real inv_dy,
+                    const amrex::Real inv_dz,
+                    const amrex::IntVect domain_small_end )
+{
+    amrex::IntVect iv;
+    AMREX_D_TERM(iv[0]=static_cast<int>(floor((p.m_rdata.pos[0]-prob_lo_x)*inv_dx));,
+                 iv[1]=static_cast<int>(floor((p.m_rdata.pos[1]-prob_lo_y)*inv_dy));,
+                 iv[2]=static_cast<int>(floor((p.m_rdata.pos[2]-prob_lo_z)*inv_dz)););
+
+    iv += domain_small_end;
+
+    return iv;
+};
+
 #endif // WARPX_PARTICLES_SORTING_SORTINGUTILS_H_