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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
#include "BLI_float4x4.hh"
#include "BLI_kdtree.h"
#include "BLI_math_vector.hh"
#include "BLI_span.hh"
#include "BKE_bvhutils.h"
#include "BKE_curves.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
namespace blender::geometry {
struct AddCurvesOnMeshInputs {
/** Information about the root points where new curves should be generated. */
Span<float3> root_positions_cu;
Span<float3> bary_coords;
Span<int> looptri_indices;
/** Determines shape of new curves. */
bool interpolate_length = false;
bool interpolate_shape = false;
bool interpolate_point_count = false;
float fallback_curve_length = 0.0f;
int fallback_point_count = 0;
/** Information about the surface that the new curves are attached to. */
const Mesh *surface = nullptr;
BVHTreeFromMesh *surface_bvh = nullptr;
Span<MLoopTri> surface_looptris;
Span<float2> surface_uv_map;
Span<float3> corner_normals_su;
/** Transformation matrices. */
float4x4 curves_to_surface_mat;
float4x4 surface_to_curves_normal_mat;
/**
* KD-Tree that contains the root points of existing curves. This is only necessary when
* interpolation is used.
*/
KDTree_3d *old_roots_kdtree = nullptr;
};
/**
* Generate new curves on a mesh surface with the given inputs. Existing curves stay intact.
*/
void add_curves_on_mesh(bke::CurvesGeometry &curves, const AddCurvesOnMeshInputs &inputs);
} // namespace blender::geometry
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