Differential D12581 Diff 42136 source/blender/nodes/geometry/nodes/node_geo_input_tangent.cc

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source/blender/nodes/geometry/nodes/node_geo_input_tangent.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 "BLI_task.hh"

				#include "BKE_spline.hh"

				#include "node_geometry_util.hh"

				namespace blender::nodes {

				static void geo_node_input_tangent_declare(NodeDeclarationBuilder &b)
				{
				b.add_output<decl::Vector>("Tangent");
				}

				static void calculate_bezier_tangents(const BezierSpline &spline, MutableSpan<float3> tangents)
				{
				Span<int> offsets = spline.control_point_offsets();
				Span<float3> evaluated_tangents = spline.evaluated_tangents();
				for (const int i : IndexRange(spline.size())) {
				tangents[i] = evaluated_tangents[offsets[i]];
				}
				}

				static void calculate_poly_tangents(const PolySpline &spline, MutableSpan<float3> tangents)
				{
				tangents.copy_from(spline.evaluated_tangents());
				}

				static void calculate_nurbs_tangents(const NURBSpline &spline, MutableSpan<float3> tangents)
				{
				PolySpline poly_spline;
				poly_spline.resize(spline.size());
				poly_spline.positions().copy_from(spline.positions());
				tangents.copy_from(poly_spline.evaluated_tangents());
				}

				static Array<float3> curve_tangent_point_domain(const CurveEval &curve)
				{
				Span<SplinePtr> splines = curve.splines();
				Array<int> offsets = curve.control_point_offsets();
				const int total_size = offsets.last();
				Array<float3> tangents(total_size);

				threading::parallel_for(splines.index_range(), 128, [&](IndexRange range) {
				for (const int i : range) {
				const Spline &spline = *splines[i];
				MutableSpan spline_tangents{tangents.as_mutable_span().slice(offsets[i], spline.size())};
				switch (splines[i]->type()) {
				case Spline::Type::Bezier: {
				calculate_bezier_tangents(static_cast<const BezierSpline &>(spline), spline_tangents);
				break;
				}
				case Spline::Type::Poly: {
				calculate_poly_tangents(static_cast<const PolySpline &>(spline), spline_tangents);
				break;
				}
				case Spline::Type::NURBS: {
				calculate_nurbs_tangents(static_cast<const NURBSpline &>(spline), spline_tangents);
				break;
				}
				}
				}
				});
				return tangents;
				}

				static const GVArray *construct_curve_tangent_gvarray(const CurveComponent &component,
				const AttributeDomain domain,
				ResourceScope &scope)
				{
				const CurveEval *curve = component.get_for_read();
				if (curve == nullptr) {
				return nullptr;
				}

				if (domain == ATTR_DOMAIN_POINT) {
				const Span<SplinePtr> splines = curve->splines();
				if (splines.size() == 1 && splines.first()->type() == Spline::Type::Poly) {
				const PolySpline &spline = static_cast<PolySpline &>(*splines.first());
				return &scope.construct<fn::GVArray_For_Span<float3>>(spline.evaluated_tangents());
				}
				Array<float3> tangents = curve_tangent_point_domain(*curve);
				return &scope.construct<fn::GVArray_For_ArrayContainer<Array<float3>>>(std::move(tangents));
				}

				if (domain == ATTR_DOMAIN_CURVE) {
				Array<float3> point_tangents = curve_tangent_point_domain(*curve);
				GVArrayPtr gvarray = std::make_unique<fn::GVArray_For_ArrayContainer<Array<float3>>>(
				std::move(point_tangents));
				GVArrayPtr spline_tangents = component.attribute_try_adapt_domain(
				std::move(gvarray), ATTR_DOMAIN_POINT, ATTR_DOMAIN_CURVE);
				return scope.add_value(std::move(spline_tangents)).get();
				}

				return nullptr;
				}

				class TangentFieldInput final : public fn::FieldInput {
				public:
				TangentFieldInput() : fn::FieldInput(CPPType::get<float3>(), "Tangent")
				{
				}

				const GVArray *get_varray_for_context(const fn::FieldContext &context,
				IndexMask UNUSED(mask),
				ResourceScope &scope) const final
				{
				if (const GeometryComponentFieldContext *geometry_context =
				dynamic_cast<const GeometryComponentFieldContext *>(&context)) {

				const GeometryComponent &component = geometry_context->geometry_component();
				const AttributeDomain domain = geometry_context->domain();

				if (component.type() == GEO_COMPONENT_TYPE_CURVE) {
				const CurveComponent &curve_component = static_cast<const CurveComponent &>(component);
				return construct_curve_tangent_gvarray(curve_component, domain, scope);
				}
				}
				return nullptr;
				}

				uint64_t hash() const override
				{
				/* Some random constant hash. */
				return 91827364589;
				}

				bool is_equal_to(const fn::FieldNode &other) const override
				{
				return dynamic_cast<const TangentFieldInput *>(&other) != nullptr;
				}
				};

				static void geo_node_input_tangent_exec(GeoNodeExecParams params)
				{
				Field<float3> tangent_field{std::make_shared<TangentFieldInput>()};
				params.set_output("Tangent", std::move(tangent_field));
				}

				} // namespace blender::nodes

				void register_node_type_geo_input_tangent()
				{
				static bNodeType ntype;

				geo_node_type_base(&ntype, GEO_NODE_INPUT_TANGENT, "Curve Tangent", NODE_CLASS_INPUT, 0);
				ntype.geometry_node_execute = blender::nodes::geo_node_input_tangent_exec;
				ntype.declare = blender::nodes::geo_node_input_tangent_declare;
				nodeRegisterType(&ntype);
				}