source/blender/editors/sculpt_paint/curves_sculpt_intern.hh


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/* SPDX-License-Identifier: GPL-2.0-or-later */

#pragma once

#include <optional>

#include "curves_sculpt_intern.h"
#include "paint_intern.h"

#include "BLI_math_vector.hh"

#include "BKE_curves.hh"

struct ARegion;
struct RegionView3D;
struct Depsgraph;
struct View3D;
struct Object;
struct Brush;
struct Scene;

namespace blender::ed::sculpt_paint {

using bke::CurvesGeometry;

struct StrokeExtension {
  bool is_first;
  float2 mouse_position;
  float pressure;
};

float brush_radius_factor(const Brush &brush, const StrokeExtension &stroke_extension);
float brush_radius_get(const Scene &scene,
                       const Brush &brush,
                       const StrokeExtension &stroke_extension);

float brush_strength_factor(const Brush &brush, const StrokeExtension &stroke_extension);
float brush_strength_get(const Scene &scene,
                         const Brush &brush,
                         const StrokeExtension &stroke_extension);

/**
 * Base class for stroke based operations in curves sculpt mode.
 */
class CurvesSculptStrokeOperation {
 public:
  virtual ~CurvesSculptStrokeOperation() = default;
  virtual void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) = 0;
};

std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation(const bContext &C,
                                                               ReportList *reports);
std::unique_ptr<CurvesSculptStrokeOperation> new_comb_operation();
std::unique_ptr<CurvesSculptStrokeOperation> new_delete_operation();
std::unique_ptr<CurvesSculptStrokeOperation> new_snake_hook_operation();
std::unique_ptr<CurvesSculptStrokeOperation> new_grow_shrink_operation(
    const BrushStrokeMode brush_mode, const bContext &C);

struct CurvesBrush3D {
  float3 position_cu;
  float radius_cu;
};

/**
 * Find 3d brush position based on cursor position for curves sculpting.
 */
std::optional<CurvesBrush3D> sample_curves_3d_brush(const Depsgraph &depsgraph,
                                                    const ARegion &region,
                                                    const View3D &v3d,
                                                    const RegionView3D &rv3d,
                                                    const Object &curves_object,
                                                    const float2 &brush_pos_re,
                                                    const float brush_radius_re);

Vector<float4x4> get_symmetry_brush_transforms(eCurvesSymmetryType symmetry);

}  // namespace blender::ed::sculpt_paint