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//  Copyright (c) 2016, Los Alamos National Security, LLC
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//  This code is based on the algorithm presented in the paper:
//  “Parallel Peak Pruning for Scalable SMP Contour Tree Computation.”
//  Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
//  Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
//  (LDAV), October 2016, Baltimore, Maryland.

#ifndef vtkm_worklet_contourtree_mesh3d_dem_triangulation_macros_h
#define vtkm_worklet_contourtree_mesh3d_dem_triangulation_macros_h

// macro definitions
#define N_EDGE_TYPES 3
#define EDGE_TYPE_HORIZONTAL 0
#define EDGE_TYPE_VERTICAL 1
#define EDGE_TYPE_DIAGONAL 2

#define N_INCIDENT_EDGES_3D 14
#define MAX_OUTDEGREE_3D 6

// vertex row
#define VERTEX_ROW_3D(V, NROWS, NCOLS) (((V) % (NROWS * NCOLS)) / NCOLS)

// vertex column
#define VERTEX_COL_3D(V, NROWS, NCOLS) ((V) % (NCOLS))

// vertex slice
#define VERTEX_SLICE_3D(V, NROWS, NCOLS) ((V) / (NROWS * NCOLS))

// vertex ID - row * ncols + col
#define VERTEX_ID_3D(S, R, C, NROWS, NCOLS) (((S)*NROWS + (R)) * (NCOLS) + (C))

// edge row - edge / (ncols * nEdgeTypes)
#define EDGE_ROW(E, NCOLS) ((E) / ((NCOLS) * (N_EDGE_TYPES)))
// edge col - (edge / nEdgeTypes) % nCols
#define EDGE_COL(E, NCOLS) (((E) / (N_EDGE_TYPES)) % (NCOLS))
// edge which - edge % nEdgeTypes
#define EDGE_WHICH(E) ((E) % (N_EDGE_TYPES))
// edge ID - (row * ncols + col) * nEdgeTypes + which
#define EDGE_ID(R, C, W, NCOLS) ((((R) * (NCOLS) + (C)) * (N_EDGE_TYPES)) + (W))
// edge from - vertex with same row & col
#define EDGE_FROM(E, NCOLS) VERTEX_ID(EDGE_ROW(E, NCOLS), EDGE_COL(E, NCOLS), NCOLS)
// edge to - edge from +1 col if not vertical, +1 row if not horizontal
#define EDGE_TO(E, NCOLS)                                                           \
  VERTEX_ID(EDGE_ROW(E, NCOLS) + ((EDGE_WHICH(E) == EDGE_TYPE_HORIZONTAL) ? 0 : 1), \
            EDGE_COL(E, NCOLS) + ((EDGE_WHICH(E) == EDGE_TYPE_VERTICAL) ? 0 : 1),   \
            NCOLS)

#endif
