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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bke
*/
#include "BLI_generic_virtual_array.hh"
#include "BLI_math_vec_types.hh"
#include "BKE_attribute.h"
struct Mesh;
namespace blender::bke {
struct ReadAttributeLookup;
class OutputAttribute;
} // namespace blender::bke
namespace blender::bke::mesh_surface_sample {
void sample_point_attribute(const Mesh &mesh,
Span<int> looptri_indices,
Span<float3> bary_coords,
const GVArray &data_in,
const IndexMask mask,
GMutableSpan data_out);
void sample_corner_attribute(const Mesh &mesh,
Span<int> looptri_indices,
Span<float3> bary_coords,
const GVArray &data_in,
const IndexMask mask,
GMutableSpan data_out);
void sample_face_attribute(const Mesh &mesh,
Span<int> looptri_indices,
const GVArray &data_in,
const IndexMask mask,
GMutableSpan data_out);
enum class eAttributeMapMode {
INTERPOLATED,
NEAREST,
};
/**
* A utility class that performs attribute interpolation from a source mesh.
*
* The interpolator is only valid as long as the mesh is valid.
* Barycentric weights are needed when interpolating point or corner domain attributes,
* these are computed lazily when needed and re-used.
*/
class MeshAttributeInterpolator {
private:
const Mesh *mesh_;
const IndexMask mask_;
const Span<float3> positions_;
const Span<int> looptri_indices_;
Array<float3> bary_coords_;
Array<float3> nearest_weights_;
public:
MeshAttributeInterpolator(const Mesh *mesh,
const IndexMask mask,
const Span<float3> positions,
const Span<int> looptri_indices);
void sample_data(const GVArray &src,
eAttrDomain domain,
eAttributeMapMode mode,
const GMutableSpan dst);
void sample_attribute(const ReadAttributeLookup &src_attribute,
OutputAttribute &dst_attribute,
eAttributeMapMode mode);
protected:
Span<float3> ensure_barycentric_coords();
Span<float3> ensure_nearest_weights();
};
} // namespace blender::bke::mesh_surface_sample
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