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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
/** \file
* \ingroup bke
*/
#include "FN_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 {
using fn::CPPType;
using fn::GMutableSpan;
using fn::GSpan;
using fn::GVArray;
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,
AttributeDomain 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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