VertexReconstruction.hpp

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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2026 Caleb Buahin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

 
#ifndef OPENSWMM_ENGINE_2D_VERTEX_RECONSTRUCTION_HPP
#define OPENSWMM_ENGINE_2D_VERTEX_RECONSTRUCTION_HPP
 
#include "../data/MeshData.hpp"
#include "../data/SurfaceStateData.hpp"
 
namespace openswmm::twoD {

void buildVertexStencils(MeshData& mesh);

void reconstructVertexHeads(const MeshData& mesh, SurfaceStateData& state,
                             int nthreads = 1);

inline double vertexHeadAt(const MeshData& mesh, const SurfaceStateData& state,
                           int v) noexcept {
    const int start = mesh.vert_stencil_ptr[v];
    const int end   = mesh.vert_stencil_ptr[v + 1];
    double h = 0.0;
    for (int k = start; k < end; ++k)
        h += mesh.vert_stencil_wt[k] * state.head[mesh.vert_stencil_idx[k]];
    return h;
}

double cellFreeSurfaceElevation(double mean_depth, double za, double zb,
                                double zc);

double cellFreeSurfaceElevationOf(const MeshData& mesh, int t, double mean_depth);

void reconstructVertexRenderDepths(const MeshData& mesh, SurfaceStateData& state,
                                   double dry_depth, int nthreads,
                                   std::vector<double>& eta_scratch);

inline void reconstructVertexRenderDepths(const MeshData& mesh,
                                          SurfaceStateData& state,
                                          double dry_depth, int nthreads = 1) {
    std::vector<double> eta_scratch;
    reconstructVertexRenderDepths(mesh, state, dry_depth, nthreads,
                                  eta_scratch);
}
 
} // namespace openswmm::twoD
 
#endif // OPENSWMM_ENGINE_2D_VERTEX_RECONSTRUCTION_HPP