Differential D11057 Diff 36450 source/blender/blenkernel/intern/mesh_sample.cc

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source/blender/blenkernel/intern/mesh_sample.cc

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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