obj_export_nurbs.hh

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

 
#pragma once
 
#include "BLI_math_vector_types.hh"
 
struct Curve;
struct Nurb;
struct OBJExportParams;
 
namespace blender::bke {
class CurvesGeometry;
}
 
namespace blender::io::obj {

Span<float> valid_nurb_control_point_range(int8_t order,
                                           Span<float> knots,
                                           IndexRange &point_range);

class IOBJCurve {
 public:
  virtual ~IOBJCurve() = default;
 
  virtual const float4x4 &object_transform() const = 0;
 
  virtual const char *get_curve_name() const = 0;

  virtual int total_splines() const = 0;
  virtual int total_spline_vertices(int spline_index) const = 0;
  virtual int num_control_points_u(int spline_index) const = 0;
  virtual int num_control_points_v(int spline_index) const = 0;
  virtual int get_nurbs_degree_u(int spline_index) const = 0;
  virtual int get_nurbs_degree_v(int spline_index) const = 0;
  virtual bool get_cyclic_u(int spline_index) const = 0;
  virtual Span<float> get_knots_u(int spline_index, Vector<float> &buffer) const = 0;
  virtual Span<float3> vertex_coordinates(int spline_index,
                                          Vector<float3> &dynamic_point_buffer) const = 0;
};
 
class OBJCurves : public IOBJCurve, NonCopyable {
 private:
  const bke::CurvesGeometry &curve_;
  const float4x4 transform_;
  const std::string name_;
 
 public:
  OBJCurves(const bke::CurvesGeometry &curve, const float4x4 &transform, const std::string &name);
  virtual ~OBJCurves() override = default;
 
  const float4x4 &object_transform() const override;
 
  const char *get_curve_name() const override;
 
  int total_splines() const override;
  int total_spline_vertices(int spline_index) const override;
  int num_control_points_u(int spline_index) const override;
  int num_control_points_v(int spline_index) const override;
  int get_nurbs_degree_u(int spline_index) const override;
  int get_nurbs_degree_v(int spline_index) const override;
  bool get_cyclic_u(int spline_index) const override;
  Span<float> get_knots_u(int spline_index, Vector<float> &buffer) const override;
  Span<float3> vertex_coordinates(int spline_index,
                                  Vector<float3> &dynamic_point_buffer) const override;
};
 
class OBJLegacyCurve : public IOBJCurve, NonCopyable {
 private:
  const Object *export_object_eval_;
  const Curve *export_curve_;
 
  const Nurb *get_spline(int spline_index) const;
 
 public:
  OBJLegacyCurve(const Depsgraph *depsgraph, Object *curve_object);
  virtual ~OBJLegacyCurve() override = default;
 
  const float4x4 &object_transform() const override;
 
  const char *get_curve_name() const override;
 
  int total_splines() const override;
  int total_spline_vertices(int spline_index) const override;
  int num_control_points_u(int spline_index) const override;
  int num_control_points_v(int spline_index) const override;
  int get_nurbs_degree_u(int spline_index) const override;
  int get_nurbs_degree_v(int spline_index) const override;
  bool get_cyclic_u(int spline_index) const override;
  Span<float> get_knots_u(int spline_index, Vector<float> &buffer) const override;
  Span<float3> vertex_coordinates(int spline_index,
                                  Vector<float3> &dynamic_point_buffer) const override;
};
 
}  // namespace blender::io::obj