BKE_mesh.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once

 
#include "BLI_index_mask_fwd.hh"
#include "BLI_math_matrix_types.hh"
#include "BLI_offset_indices.hh"
#include "BLI_string_ref.hh"
 
#include "BKE_mesh.h"         // IWYU pragma: export
#include "BKE_mesh_types.hh"  // IWYU pragma: export
 
namespace blender::bke {
 
enum class AttrDomain : int8_t;
struct AttributeAccessorFunctions;
 
namespace mesh {
/* -------------------------------------------------------------------- */

float3 face_normal_calc(Span<float3> vert_positions, Span<int> face_verts);
 
void corner_tris_calc(Span<float3> vert_positions,
                      OffsetIndices<int> faces,
                      Span<int> corner_verts,
                      MutableSpan<int3> corner_tris);

void corner_tris_calc_with_normals(Span<float3> vert_positions,
                                   OffsetIndices<int> faces,
                                   Span<int> corner_verts,
                                   Span<float3> face_normals,
                                   MutableSpan<int3> corner_tris);
 
void corner_tris_calc_face_indices(OffsetIndices<int> faces, MutableSpan<int> tri_faces);

void vert_tris_from_corner_tris(Span<int> corner_verts,
                                Span<int3> corner_tris,
                                MutableSpan<int3> vert_tris);

int3 corner_tri_get_real_edges(Span<int2> edges,
                               Span<int> corner_verts,
                               Span<int> corner_edges,
                               const int3 &corner_tri);

float3 face_center_calc(Span<float3> vert_positions, Span<int> face_verts);

float face_area_calc(Span<float3> vert_positions, Span<int> face_verts);

void face_angles_calc(Span<float3> vert_positions,
                      Span<int> face_verts,
                      MutableSpan<float> angles);

 
/* -------------------------------------------------------------------- */

void normals_calc_faces(Span<float3> vert_positions,
                        OffsetIndices<int> faces,
                        Span<int> corner_verts,
                        MutableSpan<float3> face_normals);

void normals_calc_verts(Span<float3> vert_positions,
                        OffsetIndices<int> faces,
                        Span<int> corner_verts,
                        GroupedSpan<int> vert_to_face_map,
                        Span<float3> face_normals,
                        MutableSpan<float3> vert_normals);

 
/* -------------------------------------------------------------------- */

struct CornerNormalSpace {
  float3 vec_lnor;
  float3 vec_ref;
  float3 vec_ortho;
  float ref_alpha;
  float ref_beta;
};

struct CornerNormalSpaceArray {
  Mutex build_mutex;
  Vector<CornerNormalSpace> spaces;

  Array<int> corner_space_indices;

  Vector<Array<int>> corners_by_space;
  bool create_corners_by_space = false;
};
 
short2 corner_space_custom_normal_to_data(const CornerNormalSpace &lnor_space,
                                          const float3 &custom_lnor);

void normals_calc_corners(Span<float3> vert_positions,
                          OffsetIndices<int> faces,
                          Span<int> corner_verts,
                          Span<int> corner_edges,
                          GroupedSpan<int> vert_to_face_map,
                          Span<float3> face_normals,
                          Span<bool> sharp_edges,
                          Span<bool> sharp_faces,
                          Span<short2> custom_normals,
                          CornerNormalSpaceArray *r_fan_spaces,
                          MutableSpan<float3> r_corner_normals);

void normals_corner_custom_set(Span<float3> vert_positions,
                               OffsetIndices<int> faces,
                               Span<int> corner_verts,
                               Span<int> corner_edges,
                               GroupedSpan<int> vert_to_face_map,
                               Span<float3> vert_normals,
                               Span<float3> face_normals,
                               Span<bool> sharp_faces,
                               MutableSpan<bool> sharp_edges,
                               MutableSpan<float3> r_custom_corner_normals,
                               MutableSpan<short2> r_clnors_data);

void normals_corner_custom_set_from_verts(Span<float3> vert_positions,
                                          OffsetIndices<int> faces,
                                          Span<int> corner_verts,
                                          Span<int> corner_edges,
                                          GroupedSpan<int> vert_to_face_map,
                                          Span<float3> vert_normals,
                                          Span<float3> face_normals,
                                          Span<bool> sharp_faces,
                                          MutableSpan<bool> sharp_edges,
                                          MutableSpan<float3> r_custom_vert_normals,
                                          MutableSpan<short2> r_clnors_data);

void edges_sharp_from_angle_set(OffsetIndices<int> faces,
                                Span<int> corner_verts,
                                Span<int> corner_edges,
                                Span<float3> face_normals,
                                Span<int> corner_to_face,
                                Span<bool> sharp_faces,
                                const float split_angle,
                                MutableSpan<bool> sharp_edges);
 
}  // namespace mesh

void mesh_set_custom_normals(Mesh &mesh, MutableSpan<float3> corner_normals);
void mesh_set_custom_normals_normalized(Mesh &mesh, MutableSpan<float3> corner_normals);

void mesh_set_custom_normals_from_verts(Mesh &mesh, MutableSpan<float3> vert_normals);
void mesh_set_custom_normals_from_verts_normalized(Mesh &mesh, MutableSpan<float3> vert_normals);

 
/* -------------------------------------------------------------------- */
 
namespace mesh {

inline int face_corner_prev(const IndexRange face, const int corner)
{
  return corner - 1 + (corner == face.start()) * face.size();
}

inline int face_corner_next(const IndexRange face, const int corner)
{
  if (corner == face.last()) {
    return face.start();
  }
  return corner + 1;
}

inline int face_find_corner_from_vert(const IndexRange face,
                                      const Span<int> corner_verts,
                                      const int vert)
{
  return face[corner_verts.slice(face).first_index(vert)];
}

inline int2 face_find_adjacent_verts(const IndexRange face,
                                     const Span<int> corner_verts,
                                     const int vert)
{
  const int corner = face_find_corner_from_vert(face, corner_verts, vert);
  return {corner_verts[face_corner_prev(face, corner)],
          corner_verts[face_corner_next(face, corner)]};
}

inline int face_triangles_num(const int face_size)
{
  BLI_assert(face_size > 2);
  return face_size - 2;
}

inline IndexRange face_triangles_range(OffsetIndices<int> faces, int face_i)
{
  const IndexRange face = faces[face_i];
  /* This is the same as #poly_to_tri_count which is not included here. */
  const int start_triangle = face.start() - face_i * 2;
  return IndexRange(start_triangle, face_triangles_num(face.size()));
}

inline int edge_other_vert(const int2 edge, const int vert)
{
  BLI_assert(ELEM(vert, edge[0], edge[1]));
  BLI_assert(edge[0] >= 0);
  BLI_assert(edge[1] >= 0);
  /* Order is important to avoid overflow. */
  return (edge[0] - vert) + edge[1];
}

 
}  // namespace mesh

Mesh *mesh_new_no_attributes(int verts_num, int edges_num, int faces_num, int corners_num);

void mesh_calc_edges(Mesh &mesh, bool keep_existing_edges, bool select_new_edges);
 
void mesh_translate(Mesh &mesh, const float3 &translation, bool do_shape_keys);
 
void mesh_transform(Mesh &mesh, const float4x4 &transform, bool do_shape_keys);
 
void mesh_flip_faces(Mesh &mesh, const IndexMask &selection);
 
void mesh_ensure_required_data_layers(Mesh &mesh);

void mesh_vert_normals_assign(Mesh &mesh, Span<float3> vert_normals);

void mesh_vert_normals_assign(Mesh &mesh, Vector<float3> vert_normals);
 
void mesh_smooth_set(Mesh &mesh, bool use_smooth, bool keep_sharp_edges = false);
void mesh_sharp_edges_set_from_angle(Mesh &mesh, float angle, bool keep_sharp_edges = false);

void mesh_edge_hide_from_vert(Span<int2> edges, Span<bool> hide_vert, MutableSpan<bool> hide_edge);
 
/* Hide faces when any of their vertices are hidden. */
void mesh_face_hide_from_vert(OffsetIndices<int> faces,
                              Span<int> corner_verts,
                              Span<bool> hide_vert,
                              MutableSpan<bool> hide_poly);

void mesh_hide_vert_flush(Mesh &mesh);
void mesh_hide_face_flush(Mesh &mesh);

void mesh_select_vert_flush(Mesh &mesh);
void mesh_select_edge_flush(Mesh &mesh);
void mesh_select_face_flush(Mesh &mesh);

void mesh_ensure_default_color_attribute_on_add(Mesh &mesh,
                                                StringRef id,
                                                AttrDomain domain,
                                                eCustomDataType data_type);
 
void mesh_data_update(Depsgraph &depsgraph,
                      const Scene &scene,
                      Object &ob,
                      const CustomData_MeshMasks &dataMask);

void mesh_remove_invalid_attribute_strings(Mesh &mesh);
 
const AttributeAccessorFunctions &mesh_attribute_accessor_functions();
 
}  // namespace blender::bke