[Ramses][AMR] Refinement utilities [2/4]

src/shammodels/ramses/include/shammodels/ramses/modules/AMRGridRefinementHandler.hpp

@@ -74,10 +74,41 @@ namespace shammodels::basegodunov::modules {
          */
         template<class UserAcc, class... T>
         void gen_refine_block_changes(
-            shambase::DistributedData<OptIndexList> &refine_list,
-            shambase::DistributedData<OptIndexList> &derefine_list,
+            shambase::DistributedData<sycl::buffer<u32>> &refine_flags,
+            shambase::DistributedData<sycl::buffer<u32>> &derefine_flags,
             T &&...args);
 
+        /**
+         * @brief Enforces the 2:1 refinement ratio for blocks.
+         *
+         * This function iterates through blocks marked for refinement and ensures that
+         * adjacent, coarser blocks are also marked for refinement to maintain the 2:1
+         * grid balance. This is done iteratively to propagate the refinement as needed.
+         * @param refine_flags refinement flags
+         * @param refine_list        refinement maps
+         */
+        void enforce_two_to_one_for_refinement(
+            shambase::DistributedData<sycl::buffer<u32>> &&refine_flags,
+            shambase::DistributedData<OptIndexList> &refine_list);
+
+        /**
+         * @brief Check geometrical validity for derefinement
+         *
+         * This function iterates over all blocks flagged for derefinement and checks
+         * whether all of their siblings also request derefinement, and if the merge operation can
+         * be done. If these conditions are satisfied, the merge (coarsening) operation is
+         * considered valid.
+         *
+         * To avoid duplicate operations, only the first block among each group of
+         * eight siblings is retained when all validity checks succeed.
+         *
+         * @param derefine_flags  Derefinement flags
+         * @param refine_flags    Refinement flags
+         */
+        void check_geometrical_validity_for_derefinement(
+            shambase::DistributedData<sycl::buffer<u32>> &&derefine_flags,
+            shambase::DistributedData<sycl::buffer<u32>> &&refine_flags);
+
         template<class UserAcc>
         bool internal_refine_grid(shambase::DistributedData<OptIndexList> &&refine_list);
 

src/shammodels/ramses/include/shammodels/ramses/modules/SolverStorage.hpp

@@ -60,6 +60,7 @@ namespace shammodels::basegodunov {
         using Tscal              = shambase::VecComponent<Tvec>;
         using Tgridscal          = shambase::VecComponent<TgridVec>;
         static constexpr u32 dim = shambase::VectorProperties<Tvec>::dimension;
+        using TgridUint = typename std::make_unsigned<shambase::VecComponent<TgridVec>>::type;
 
         using RTree = RadixTree<Tmorton, TgridVec>;
 
@@ -141,6 +142,9 @@ namespace shammodels::basegodunov {
 
         std::shared_ptr<shamrock::solvergraph::DDSharedBuffers<u32>> idx_in_ghost;
 
+        std::shared_ptr<shamrock::solvergraph::ScalarsEdge<TgridVec>> level0_size;
+        std::shared_ptr<shamrock::solvergraph::Field<TgridUint>> amr_block_levels;
+
         std::shared_ptr<solvergraph::NeighGraphLinkFieldEdge<std::array<Tscal, 2>>> rho_face_xp;
         std::shared_ptr<solvergraph::NeighGraphLinkFieldEdge<std::array<Tscal, 2>>> rho_face_xm;
         std::shared_ptr<solvergraph::NeighGraphLinkFieldEdge<std::array<Tscal, 2>>> rho_face_yp;