alembic_read.h

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/* SPDX-FileCopyrightText: 2021-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
#ifdef WITH_ALEMBIC
 
#  include <Alembic/AbcCoreFactory/All.h>
#  include <Alembic/AbcGeom/All.h>
 
#  include "util/vector.h"
 
CCL_NAMESPACE_BEGIN
 
class AlembicProcedural;
class AttributeRequestSet;
class Progress;
struct CachedData;
 
/* Maps a FaceSet whose name matches that of a Shader to the index of said shader in the Geometry's
 * used_shaders list. */
struct FaceSetShaderIndexPair {
  Alembic::AbcGeom::IFaceSet face_set;
  int shader_index;
};
 
/* Data of an IPolyMeshSchema that we need to read. */
struct PolyMeshSchemaData {
  Alembic::AbcGeom::TimeSamplingPtr time_sampling;
  size_t num_samples;
  Alembic::AbcGeom::MeshTopologyVariance topology_variance;
 
  Alembic::AbcGeom::IP3fArrayProperty positions;
  Alembic::AbcGeom::IInt32ArrayProperty face_indices;
  Alembic::AbcGeom::IInt32ArrayProperty face_counts;
 
  Alembic::AbcGeom::IN3fGeomParam normals;
 
  vector<FaceSetShaderIndexPair> shader_face_sets;
 
  // Unsupported for now.
  Alembic::AbcGeom::IV3fArrayProperty velocities;
};
 
void read_geometry_data(AlembicProcedural *proc,
                        CachedData &cached_data,
                        const PolyMeshSchemaData &data,
                        Progress &progress);
 
/* Data of an ISubDSchema that we need to read. */
struct SubDSchemaData {
  Alembic::AbcGeom::TimeSamplingPtr time_sampling;
  size_t num_samples;
  Alembic::AbcGeom::MeshTopologyVariance topology_variance;
 
  Alembic::AbcGeom::IInt32ArrayProperty face_counts;
  Alembic::AbcGeom::IInt32ArrayProperty face_indices;
  Alembic::AbcGeom::IP3fArrayProperty positions;
 
  Alembic::AbcGeom::IInt32ArrayProperty crease_indices;
  Alembic::AbcGeom::IInt32ArrayProperty crease_lengths;
  Alembic::AbcGeom::IFloatArrayProperty crease_sharpnesses;
 
  vector<FaceSetShaderIndexPair> shader_face_sets;
 
  Alembic::AbcGeom::IInt32ArrayProperty corner_indices;
  Alembic::AbcGeom::IFloatArrayProperty corner_sharpnesses;
 
  // Those are unsupported for now.
  Alembic::AbcGeom::IInt32Property face_varying_interpolate_boundary;
  Alembic::AbcGeom::IInt32Property face_varying_propagate_corners;
  Alembic::AbcGeom::IInt32Property interpolate_boundary;
  Alembic::AbcGeom::IInt32ArrayProperty holes;
  Alembic::AbcGeom::IStringProperty subdivision_scheme;
  Alembic::AbcGeom::IV3fArrayProperty velocities;
};
 
void read_geometry_data(AlembicProcedural *proc,
                        CachedData &cached_data,
                        const SubDSchemaData &data,
                        Progress &progress);
 
/* Data of a ICurvesSchema that we need to read. */
struct CurvesSchemaData {
  Alembic::AbcGeom::TimeSamplingPtr time_sampling;
  size_t num_samples;
  Alembic::AbcGeom::MeshTopologyVariance topology_variance;
 
  Alembic::AbcGeom::IP3fArrayProperty positions;
 
  Alembic::AbcGeom::IInt32ArrayProperty num_vertices;
 
  float default_radius;
  float radius_scale;
 
  // Those are unsupported for now.
  Alembic::AbcGeom::IV3fArrayProperty velocities;
  // if this property is invalid then the weight for every point is 1
  Alembic::AbcGeom::IFloatArrayProperty position_weights;
  Alembic::AbcGeom::IN3fGeomParam normals;
  Alembic::AbcGeom::IFloatGeomParam widths;
  Alembic::AbcGeom::IUcharArrayProperty orders;
  Alembic::AbcGeom::IFloatArrayProperty knots;
 
  // TODO(@kevindietrich): type, basis, wrap
};
 
void read_geometry_data(AlembicProcedural *proc,
                        CachedData &cached_data,
                        const CurvesSchemaData &data,
                        Progress &progress);
 
/* Data of a IPointsSchema that we need to read. */
struct PointsSchemaData {
  Alembic::AbcGeom::TimeSamplingPtr time_sampling;
  size_t num_samples;
 
  float default_radius;
  float radius_scale;
 
  Alembic::AbcGeom::IP3fArrayProperty positions;
  Alembic::AbcGeom::IInt32ArrayProperty num_points;
  Alembic::AbcGeom::IFloatGeomParam radiuses;
  // Those are unsupported for now.
  Alembic::AbcGeom::IV3fArrayProperty velocities;
};
 
void read_geometry_data(AlembicProcedural *proc,
                        CachedData &cached_data,
                        const PointsSchemaData &data,
                        Progress &progress);
 
void read_attributes(AlembicProcedural *proc,
                     CachedData &cache,
                     const Alembic::AbcGeom::ICompoundProperty &arb_geom_params,
                     const Alembic::AbcGeom::IV2fGeomParam &default_uvs_param,
                     const AttributeRequestSet &requested_attributes,
                     Progress &progress);
 
CCL_NAMESPACE_END
 
#endif