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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.
*/
#include "BKE_attribute_math.hh"
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_sample.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
namespace blender::bke::mesh_surface_sample {
static Span<MLoopTri> get_mesh_looptris(const Mesh &mesh)
{
/* This only updates a cache and can be considered to be logically const. */
const MLoopTri *looptris = BKE_mesh_runtime_looptri_ensure(const_cast<Mesh *>(&mesh));
const int looptris_len = BKE_mesh_runtime_looptri_len(&mesh);
return {looptris, looptris_len};
}
template<typename T>
BLI_NOINLINE static void sample_point_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const Span<float3> bary_coords,
const VArray<T> &data_in,
const MutableSpan<T> data_out)
{
const Span<MLoopTri> looptris = get_mesh_looptris(mesh);
for (const int i : bary_coords.index_range()) {
const int looptri_index = looptri_indices[i];
const MLoopTri &looptri = looptris[looptri_index];
const float3 &bary_coord = bary_coords[i];
const int v0_index = mesh.mloop[looptri.tri[0]].v;
const int v1_index = mesh.mloop[looptri.tri[1]].v;
const int v2_index = mesh.mloop[looptri.tri[2]].v;
const T v0 = data_in[v0_index];
const T v1 = data_in[v1_index];
const T v2 = data_in[v2_index];
const T interpolated_value = attribute_math::mix3(bary_coord, v0, v1, v2);
data_out[i] = interpolated_value;
}
}
void sample_point_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const Span<float3> bary_coords,
const GVArray &data_in,
const GMutableSpan data_out)
{
BLI_assert(data_out.size() == looptri_indices.size());
BLI_assert(data_out.size() == bary_coords.size());
BLI_assert(data_in.size() == mesh.totvert);
BLI_assert(data_in.type() == data_out.type());
const CPPType &type = data_in.type();
attribute_math::convert_to_static_type(type, [&](auto dummy) {
using T = decltype(dummy);
sample_point_attribute<T>(
mesh, looptri_indices, bary_coords, data_in.typed<T>(), data_out.typed<T>());
});
}
template<typename T>
BLI_NOINLINE static void sample_corner_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const Span<float3> bary_coords,
const VArray<T> &data_in,
const MutableSpan<T> data_out)
{
Span<MLoopTri> looptris = get_mesh_looptris(mesh);
for (const int i : bary_coords.index_range()) {
const int looptri_index = looptri_indices[i];
const MLoopTri &looptri = looptris[looptri_index];
const float3 &bary_coord = bary_coords[i];
const int loop_index_0 = looptri.tri[0];
const int loop_index_1 = looptri.tri[1];
const int loop_index_2 = looptri.tri[2];
const T v0 = data_in[loop_index_0];
const T v1 = data_in[loop_index_1];
const T v2 = data_in[loop_index_2];
const T interpolated_value = attribute_math::mix3(bary_coord, v0, v1, v2);
data_out[i] = interpolated_value;
}
}
void sample_corner_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const Span<float3> bary_coords,
const GVArray &data_in,
const GMutableSpan data_out)
{
BLI_assert(data_out.size() == looptri_indices.size());
BLI_assert(data_out.size() == bary_coords.size());
BLI_assert(data_in.size() == mesh.totloop);
BLI_assert(data_in.type() == data_out.type());
const CPPType &type = data_in.type();
attribute_math::convert_to_static_type(type, [&](auto dummy) {
using T = decltype(dummy);
sample_corner_attribute<T>(
mesh, looptri_indices, bary_coords, data_in.typed<T>(), data_out.typed<T>());
});
}
template<typename T>
void sample_face_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const VArray<T> &data_in,
const MutableSpan<T> data_out)
{
Span<MLoopTri> looptris = get_mesh_looptris(mesh);
for (const int i : data_out.index_range()) {
const int looptri_index = looptri_indices[i];
const MLoopTri &looptri = looptris[looptri_index];
const int poly_index = looptri.poly;
data_out[i] = data_in[poly_index];
}
}
void sample_face_attribute(const Mesh &mesh,
const Span<int> looptri_indices,
const GVArray &data_in,
const GMutableSpan data_out)
{
BLI_assert(data_out.size() == looptri_indices.size());
BLI_assert(data_in.size() == mesh.totpoly);
BLI_assert(data_in.type() == data_out.type());
const CPPType &type = data_in.type();
attribute_math::convert_to_static_type(type, [&](auto dummy) {
using T = decltype(dummy);
sample_face_attribute<T>(mesh, looptri_indices, data_in.typed<T>(), data_out.typed<T>());
});
}
} // namespace blender::bke::mesh_surface_sample
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