mesh_primitive_line.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_bounds.hh"
 
#include "BKE_mesh.hh"
 
#include "GEO_mesh_primitive_line.hh"
 
namespace blender::geometry {
 
Mesh *create_line_mesh(const float3 start, const float3 delta, const int count)
{
  if (count < 1) {
    return nullptr;
  }
 
  const int edges_num = count - 1;
  Mesh *mesh = BKE_mesh_new_nomain(count, edges_num, 0, 0);
  MutableSpan<float3> positions = mesh->vert_positions_for_write();
  MutableSpan<int2> edges = mesh->edges_for_write();
 
  threading::memory_bandwidth_bound_task(positions.size_in_bytes() + edges.size_in_bytes(), [&]() {
    threading::parallel_invoke(
        1024 < count,
        [&]() {
          threading::parallel_for(positions.index_range(), 4096, [&](IndexRange range) {
            for (const int i : range) {
              positions[i] = start + delta * i;
            }
          });
        },
        [&]() {
          threading::parallel_for(edges.index_range(), 4096, [&](IndexRange range) {
            for (const int i : range) {
              edges[i][0] = i;
              edges[i][1] = i + 1;
            }
          });
        });
  });
 
  mesh->tag_loose_verts_none();
  mesh->tag_overlapping_none();
  mesh->bounds_set_eager(*bounds::min_max<float3>({start, start + delta * edges_num}));
 
  return mesh;
}
 
}  // namespace blender::geometry