multires_versioning.cc

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "MEM_guardedalloc.h"
 
#include "DNA_mesh_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
 
#include "BKE_subdiv.hh"
#include "BKE_subdiv_eval.hh"
 
#include "multires_reshape.hh"
#include "opensubdiv_converter_capi.hh"
#include "subdiv_converter.hh"
 
#ifdef WITH_OPENSUBDIV
 
static float simple_to_catmull_clark_get_edge_sharpness(const OpenSubdiv_Converter * /*converter*/,
                                                        int /*manifold_edge_index*/)
{
  return 10.0f;
}
 
static bool simple_to_catmull_clark_is_infinite_sharp_vertex(
    const OpenSubdiv_Converter * /*converter*/, int /*manifold_vertex_index*/)
{
  return true;
}
 
static blender::bke::subdiv::Subdiv *subdiv_for_simple_to_catmull_clark(Object *object,
                                                                        MultiresModifierData *mmd)
{
  using namespace blender::bke;
  subdiv::Settings subdiv_settings;
  BKE_multires_subdiv_settings_init(&subdiv_settings, mmd);
 
  const Mesh *base_mesh = static_cast<const Mesh *>(object->data);
 
  OpenSubdiv_Converter converter;
  subdiv::converter_init_for_mesh(&converter, &subdiv_settings, base_mesh);
  converter.getEdgeSharpness = simple_to_catmull_clark_get_edge_sharpness;
  converter.isInfiniteSharpVertex = simple_to_catmull_clark_is_infinite_sharp_vertex;
 
  subdiv::Subdiv *subdiv = subdiv::new_from_converter(&subdiv_settings, &converter);
  subdiv::converter_free(&converter);
 
  if (!subdiv::eval_begin_from_mesh(
          subdiv, base_mesh, {}, subdiv::SUBDIV_EVALUATOR_TYPE_CPU, nullptr))
  {
    subdiv::free(subdiv);
    return nullptr;
  }
 
  return subdiv;
}
 
#endif
 
void multires_do_versions_simple_to_catmull_clark(Object *object, MultiresModifierData *mmd)
{
#ifdef WITH_OPENSUBDIV
  const Mesh *base_mesh = static_cast<const Mesh *>(object->data);
  if (base_mesh->corners_num == 0) {
    return;
  }
 
  /* Store the grids displacement in object space against the simple limit surface. */
  {
    blender::bke::subdiv::Subdiv *subdiv = subdiv_for_simple_to_catmull_clark(object, mmd);
    MultiresReshapeContext reshape_context;
    if (!multires_reshape_context_create_from_subdiv(
            &reshape_context, object, mmd, subdiv, mmd->totlvl))
    {
      blender::bke::subdiv::free(subdiv);
      return;
    }
 
    multires_reshape_store_original_grids(&reshape_context);
    multires_reshape_assign_final_coords_from_mdisps(&reshape_context);
    multires_reshape_context_free(&reshape_context);
 
    blender::bke::subdiv::free(subdiv);
  }
 
  /* Calculate the new tangent displacement against the new Catmull-Clark limit surface. */
  {
    MultiresReshapeContext reshape_context;
    if (!multires_reshape_context_create_from_modifier(&reshape_context, object, mmd, mmd->totlvl))
    {
      return;
    }
    multires_reshape_object_grids_to_tangent_displacement(&reshape_context);
    multires_reshape_context_free(&reshape_context);
  }
#else
  UNUSED_VARS(object, mmd);
#endif
}