multires_unsubdivide.hh

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
#include "BLI_span.hh"
#include "BLI_virtual_array.hh"
 
struct BMesh;
struct Mesh;
struct MDisps;
struct MultiresModifierData;
 
struct MultiresUnsubdivideGrid {
  /* For sanity checks. */
  int grid_index;
  int grid_size;

  float (*grid_co)[3];
};
 
struct MultiresUnsubdivideContext {
  /* Input Mesh to un-subdivide. */
  Mesh *original_mesh = nullptr;
  MDisps *original_mdisp = nullptr;

  int num_original_levels;

  Mesh *base_mesh = nullptr;

  int max_new_levels = 0;

  int num_new_levels = 0;

  int num_total_levels = 0;

  int num_grids;
  MultiresUnsubdivideGrid *base_mesh_grids = nullptr;
 
  /* Private data. */
  BMesh *bm_original_mesh = nullptr;
  blender::Span<int> loop_to_face_map;
  blender::VArraySpan<int> base_to_orig_vmap;
};
 
/* --------------------------------------------------------------------
 * Construct/destruct reshape context.
 */
 
void multires_unsubdivide_context_init(MultiresUnsubdivideContext *context,
                                       Mesh *original_mesh,
                                       MultiresModifierData *mmd);
void multires_unsubdivide_context_free(MultiresUnsubdivideContext *context);
 
/* --------------------------------------------------------------------
 * Rebuild Lower Subdivisions.
 */
 
/* Rebuilds all subdivision to the level 0 base mesh. */
bool multires_unsubdivide_to_basemesh(MultiresUnsubdivideContext *context);