Geometry Nodes: Fields version of edge split node

This changes the edge split node to have a selection input, which is
more aligned with the other design changes. This loses the ability to
split edges based on an angle, but the edge angle can be added as a
field input node in the future, which will make for a much more
flexible system.

Differential Revision: https://developer.blender.org/D12829

release/scripts/startup/nodeitems_builtins.py

@@ -143,6 +143,7 @@ def mesh_node_items(context):
         yield NodeItem("GeometryNodeLegacySubdivisionSurface", poll=geometry_nodes_legacy_poll)
         yield NodeItemCustom(draw=lambda self, layout, context: layout.separator())
 
+    yield NodeItem("GeometryNodeEdgeSplit")
     yield NodeItem("GeometryNodeBoolean")
     yield NodeItem("GeometryNodeMeshSubdivide")
     yield NodeItem("GeometryNodePointsToVertices")

source/blender/blenkernel/BKE_node.h

@@ -1535,6 +1535,7 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
 #define GEO_NODE_TRANSLATE_INSTANCES 1120
 #define GEO_NODE_SCALE_INSTANCES 1121
 #define GEO_NODE_ROTATE_INSTANCES 1122
+#define GEO_NODE_EDGE_SPLIT 1123
 
 /** \} */
 

source/blender/blenkernel/intern/node.cc

@@ -5720,6 +5720,7 @@ static void registerGeometryNodes()
   register_node_type_geo_legacy_curve_reverse();
   register_node_type_geo_legacy_select_by_handle_type();
   register_node_type_geo_legacy_curve_subdivide();
+  register_node_type_geo_legacy_edge_split();
 
   register_node_type_geo_align_rotation_to_vector();
   register_node_type_geo_attribute_capture();

source/blender/nodes/CMakeLists.txt

@@ -220,6 +220,7 @@ set(SRC
   geometry/nodes/node_geo_curve_trim.cc
   geometry/nodes/node_geo_delete_geometry.cc
   geometry/nodes/node_geo_distribute_points_on_faces.cc
+  geometry/nodes/node_geo_edge_split.cc
   geometry/nodes/node_geo_input_curve_handles.cc
   geometry/nodes/node_geo_input_curve_tilt.cc  
   geometry/nodes/node_geo_input_index.cc

source/blender/nodes/NOD_geometry.h

@@ -40,6 +40,7 @@ void register_node_type_geo_legacy_curve_spline_type(void);
 void register_node_type_geo_legacy_curve_reverse(void);
 void register_node_type_geo_legacy_select_by_handle_type(void);
 void register_node_type_geo_legacy_curve_subdivide(void);
+void register_node_type_geo_legacy_edge_split(void);
 
 void register_node_type_geo_align_rotation_to_vector(void);
 void register_node_type_geo_attribute_capture(void);

source/blender/nodes/NOD_static_types.h

@@ -348,6 +348,7 @@ DefNode(GeometryNode, GEO_NODE_CURVE_TO_MESH, 0, "CURVE_TO_MESH", CurveToMesh, "
 DefNode(GeometryNode, GEO_NODE_CURVE_TRIM, def_geo_curve_trim, "CURVE_TRIM", CurveTrim, "Trim Curve", "")
 DefNode(GeometryNode, GEO_NODE_DELETE_GEOMETRY, def_geo_delete_geometry, "DELETE_GEOMETRY", DeleteGeometry, "Delete Geometry", "")
 DefNode(GeometryNode, GEO_NODE_DISTRIBUTE_POINTS_ON_FACES, def_geo_distribute_points_on_faces, "DISTRIBUTE_POINTS_ON_FACES", DistributePointsOnFaces, "Distribute Points on Faces", "")
+DefNode(GeometryNode, GEO_NODE_EDGE_SPLIT, 0, "EDGE_SPLIT", EdgeSplit, "Edge Split", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_CURVE_HANDLES, 0, "INPUT_CURVE_HANDLES", InputCurveHandlePositions, "Curve Handle Positions", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_CURVE_TILT, 0, "INPUT_CURVE_TILT", InputCurveTilt, "Curve Tilt", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_INDEX, 0, "INDEX", InputIndex, "Index", "")

source/blender/nodes/geometry/nodes/legacy/node_geo_edge_split.cc

@@ -78,7 +78,7 @@ static void geo_node_edge_split_exec(GeoNodeExecParams params)
 
 }  // namespace blender::nodes
 
-void register_node_type_geo_edge_split()
+void register_node_type_geo_legacy_edge_split()
 {
   static bNodeType ntype;
 

source/blender/nodes/geometry/nodes/node_geo_edge_split.cc

@@ -0,0 +1,94 @@
+/*
+ * 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_mesh.h"
+#include "BKE_mesh_runtime.h"
+
+#include "bmesh.h"
+#include "bmesh_tools.h"
+
+#include "node_geometry_util.hh"
+
+namespace blender::nodes {
+
+static void geo_node_edge_split_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Geometry>("Mesh");
+  b.add_input<decl::Bool>("Selection").default_value(true).hide_value().supports_field();
+  b.add_output<decl::Geometry>("Mesh");
+}
+
+static Mesh *mesh_edge_split(const Mesh &mesh, const IndexMask selection)
+{
+  const BMeshCreateParams bmcp = {true};
+  const BMAllocTemplate allocsize = {0, 0, 0, 0};
+  BMesh *bm = BM_mesh_create(&allocsize, &bmcp);
+
+  BMeshFromMeshParams params{};
+  BM_mesh_bm_from_me(bm, &mesh, &params);
+
+  BM_mesh_elem_table_ensure(bm, BM_EDGE);
+  for (const int i : selection) {
+    BMEdge *edge = BM_edge_at_index(bm, i);
+    BM_elem_flag_enable(edge, BM_ELEM_TAG);
+  }
+
+  BM_mesh_edgesplit(bm, false, true, false);
+
+  Mesh *result = BKE_mesh_from_bmesh_for_eval_nomain(bm, NULL, &mesh);
+  BM_mesh_free(bm);
+
+  BKE_mesh_normals_tag_dirty(result);
+
+  return result;
+}
+
+static void geo_node_edge_split_exec(GeoNodeExecParams params)
+{
+  GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
+
+  const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
+
+  geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
+    if (!geometry_set.has_mesh()) {
+      return;
+    }
+
+    const MeshComponent &mesh_component = *geometry_set.get_component_for_read<MeshComponent>();
+    GeometryComponentFieldContext field_context{mesh_component, ATTR_DOMAIN_EDGE};
+    const int domain_size = mesh_component.attribute_domain_size(ATTR_DOMAIN_EDGE);
+    fn::FieldEvaluator selection_evaluator{field_context, domain_size};
+    selection_evaluator.add(selection_field);
+    selection_evaluator.evaluate();
+    const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0);
+
+    geometry_set.replace_mesh(mesh_edge_split(*mesh_component.get_for_read(), selection));
+  });
+
+  params.set_output("Mesh", std::move(geometry_set));
+}
+
+}  // namespace blender::nodes
+
+void register_node_type_geo_edge_split()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(&ntype, GEO_NODE_EDGE_SPLIT, "Edge Split", NODE_CLASS_GEOMETRY, 0);
+  ntype.geometry_node_execute = blender::nodes::geo_node_edge_split_exec;
+  ntype.declare = blender::nodes::geo_node_edge_split_declare;
+  nodeRegisterType(&ntype);
+}