FindBlockNeigh.cpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//

 
#include "shammodels/ramses/modules/FindBlockNeigh.hpp"
#include "shamalgs/details/numeric/numeric.hpp"
#include "shammath/AABB.hpp"
#include "shammodels/ramses/modules/details/compute_neigh_graph.hpp"
#include "shamrock/patch/PatchDataField.hpp"
#include "shamtree/TreeTraversal.hpp"
 
namespace shammodels::basegodunov::modules {
 
    template<class Tvec, class TgridVec, class Tmorton>
    class FindBlockNeigh<Tvec, TgridVec, Tmorton>::AMRBlockFinder {
        public:
        shamrock::tree::ObjectIterator<Tmorton, TgridVec> block_looper;
 
        sycl::accessor<TgridVec, 1, sycl::access::mode::read, sycl::target::device> acc_block_min;
        sycl::accessor<TgridVec, 1, sycl::access::mode::read, sycl::target::device> acc_block_max;
 
        TgridVec dir_offset;
 
        AMRBlockFinder(
            sycl::handler &cgh,
            const RTree &tree,
            sycl::buffer<TgridVec> &buf_block_min,
            sycl::buffer<TgridVec> &buf_block_max,
            TgridVec dir_offset)
            : block_looper(tree, cgh), acc_block_min{buf_block_min, cgh, sycl::read_only},
              acc_block_max{buf_block_max, cgh, sycl::read_only},
              dir_offset(std::move(dir_offset)) {}
 
        template<class IndexFunctor>
        void for_each_other_index(u32 id_a, IndexFunctor &&fct) const {
 
            // current block AABB
            shammath::AABB<TgridVec> block_aabb{acc_block_min[id_a], acc_block_max[id_a]};
 
            // The wanted AABB (the block we look for)
            shammath::AABB<TgridVec> check_aabb{
                block_aabb.lower + dir_offset, block_aabb.upper + dir_offset};
 
            block_looper.rtree_for(
                [&](u32 node_id, TgridVec bmin, TgridVec bmax) -> bool {
                    return shammath::AABB<TgridVec>{bmin, bmax}
                        .get_intersect(check_aabb)
                        .is_volume_not_null();
                },
                [&](u32 id_b) {
                    bool interact
                        = shammath::AABB<TgridVec>{acc_block_min[id_b], acc_block_max[id_b]}
                              .get_intersect(check_aabb)
                              .is_volume_not_null()
                          && id_b != id_a;
 
                    if (interact) {
                        fct(id_b);
                    }
                });
        }
    };
 
    template<class Tvec, class TgridVec, class Tmorton>
    void FindBlockNeigh<Tvec, TgridVec, Tmorton>::_impl_evaluate_internal() {
        auto edges = get_edges();
 
        edges.spans_block_min.check_sizes(edges.sizes.indexes);
        edges.spans_block_max.check_sizes(edges.sizes.indexes);
 
        shambase::DistributedData<OrientedAMRGraph> graph;
 
        edges.trees.trees.for_each([&](u64 id, const RTree &tree) {
            u32 leaf_count          = tree.tree_reduced_morton_codes.tree_leaf_count;
            u32 internal_cell_count = tree.tree_struct.internal_cell_count;
            u32 tot_count           = leaf_count + internal_cell_count;
 
            OrientedAMRGraph result;
 
            sham::DeviceQueue &q = shamsys::instance::get_compute_scheduler().get_queue();
 
            sycl::buffer<TgridVec> &tree_bmin
                = shambase::get_check_ref(tree.tree_cell_ranges.buf_pos_min_cell_flt);
            sycl::buffer<TgridVec> &tree_bmax
                = shambase::get_check_ref(tree.tree_cell_ranges.buf_pos_max_cell_flt);
 
            PatchDataField<TgridVec> &block_min = edges.spans_block_min.get_refs().get(id);
            PatchDataField<TgridVec> &block_max = edges.spans_block_max.get_refs().get(id);
 
            sycl::buffer<TgridVec> buf_block_min_sycl = block_min.get_buf().copy_to_sycl_buffer();
            sycl::buffer<TgridVec> buf_block_max_sycl = block_max.get_buf().copy_to_sycl_buffer();
 
            for (u32 dir = 0; dir < 6; dir++) {
 
                TgridVec dir_offset = result.offset_check[dir];
 
                AMRGraph rslt = details::compute_neigh_graph_deprecated<AMRBlockFinder>(
                    shamsys::instance::get_compute_scheduler_ptr(),
                    edges.sizes.indexes.get(id),
                    tree,
                    buf_block_min_sycl,
                    buf_block_max_sycl,
                    dir_offset);
 
                shamlog_debug_ln(
                    "AMR Block Graph", "Patch", id, "direction", dir, "link cnt", rslt.link_count);
 
                std::unique_ptr<AMRGraph> tmp_graph = std::make_unique<AMRGraph>(std::move(rslt));
 
                result.graph_links[dir] = std::move(tmp_graph);
            }
 
            graph.add_obj(id, std::move(result));
        });
 
        edges.block_neigh_graph.graph = std::move(graph);
 
        // possible unittest
        /*
        one patch with :
        sz = 1 << 4
        base = 4
        model.make_base_grid((0,0,0),(sz,sz,sz),(base*multx,base*multy,base*multz))
 
        make a grid of 4^3 blocks, which when merge with interface make 6^3 blocks.
        In each direction one slab will have no links, hence the number of links should always be
        6^3 - 6^2 = 180 which we get here on all directions
        */
    }
 
    template<class Tvec, class TgridVec, class Tmorton>
    std::string FindBlockNeigh<Tvec, TgridVec, Tmorton>::_impl_get_tex() const {
 
        std::string sizes             = get_ro_edge_base(0).get_tex_symbol();
        std::string block_min         = get_ro_edge_base(1).get_tex_symbol();
        std::string block_max         = get_ro_edge_base(2).get_tex_symbol();
        std::string trees             = get_ro_edge_base(3).get_tex_symbol();
        std::string block_neigh_graph = get_rw_edge_base(0).get_tex_symbol();
 
        std::string tex = R"tex(
            Find neighbour blocks
 
            \begin{align}
            {block_neigh_graph} = \text{FindBlockNeigh}({sizes}, {block_min}, {block_max}, {trees})
            \end{align}
        )tex";
 
        shambase::replace_all(tex, "{sizes}", sizes);
        shambase::replace_all(tex, "{block_min}", block_min);
        shambase::replace_all(tex, "{block_max}", block_max);
        shambase::replace_all(tex, "{trees}", trees);
        shambase::replace_all(tex, "{block_neigh_graph}", block_neigh_graph);
 
        return tex;
    }
 
} // namespace shammodels::basegodunov::modules
 
template class shammodels::basegodunov::modules::FindBlockNeigh<f64_3, i64_3, u64>;