Nodes: add geometry socket type

We still have to pick a color for this socket.

Ref T81848.

source/blender/blenkernel/intern/node.c

@@ -281,6 +281,7 @@ static void library_foreach_node_socket(LibraryForeachIDData *data, bNodeSocket
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -373,6 +374,7 @@ static void write_node_socket_default_value(BlendWriter *writer, bNodeSocket *so
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       BLI_assert(false);
       break;
   }
@@ -714,6 +716,7 @@ static void lib_link_node_socket(BlendLibReader *reader, Library *lib, bNodeSock
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -792,6 +795,7 @@ static void expand_node_socket(BlendExpander *expander, bNodeSocket *sock)
       case __SOCK_MESH:
       case SOCK_CUSTOM:
       case SOCK_SHADER:
+      case SOCK_GEOMETRY:
         break;
     }
   }
@@ -1348,6 +1352,7 @@ static void socket_id_user_increment(bNodeSocket *sock)
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -1374,6 +1379,7 @@ static void socket_id_user_decrement(bNodeSocket *sock)
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -1501,6 +1507,8 @@ const char *nodeStaticSocketType(int type, int subtype)
       return "NodeSocketObject";
     case SOCK_IMAGE:
       return "NodeSocketImage";
+    case SOCK_GEOMETRY:
+      return "NodeSocketGeometry";
   }
   return NULL;
 }
@@ -1566,6 +1574,8 @@ const char *nodeStaticSocketInterfaceType(int type, int subtype)
       return "NodeSocketInterfaceObject";
     case SOCK_IMAGE:
       return "NodeSocketInterfaceImage";
+    case SOCK_GEOMETRY:
+      return "NodeSocketInterfaceGeometry";
   }
   return NULL;
 }

source/blender/editors/space_node/drawnode.c

@@ -3333,6 +3333,7 @@ static const float std_node_socket_colors[][4] = {
     {0.39, 0.39, 0.39, 1.0}, /* SOCK_STRING */
     {0.40, 0.10, 0.10, 1.0}, /* SOCK_OBJECT */
     {0.10, 0.40, 0.10, 1.0}, /* SOCK_IMAGE */
+    {0.00, 0.00, 0.00, 1.0}, /* SOCK_GEOMETRY, TODO: Choose color. */
 };
 
 /* common color callbacks for standard types */

source/blender/makesdna/DNA_node_types.h

@@ -159,6 +159,7 @@ typedef enum eNodeSocketDatatype {
   SOCK_STRING = 7,
   SOCK_OBJECT = 8,
   SOCK_IMAGE = 9,
+  SOCK_GEOMETRY = 10,
 } eNodeSocketDatatype;
 
 /* socket shape */

source/blender/makesrna/intern/rna_nodetree.c

@@ -84,6 +84,7 @@ static const EnumPropertyItem node_socket_type_items[] = {
     {SOCK_SHADER, "SHADER", 0, "Shader", ""},
     {SOCK_OBJECT, "OBJECT", 0, "Object", ""},
     {SOCK_IMAGE, "IMAGE", 0, "Image", ""},
+    {SOCK_GEOMETRY, "GEOMETRY", 0, "Geometry", ""},
     {0, NULL, 0, NULL, NULL},
 };
 
@@ -96,6 +97,7 @@ static const EnumPropertyItem node_socket_data_type_items[] = {
     {SOCK_RGBA, "RGBA", 0, "Color", ""},
     {SOCK_OBJECT, "OBJECT", 0, "Object", ""},
     {SOCK_IMAGE, "IMAGE", 0, "Image", ""},
+    {SOCK_GEOMETRY, "GEOMETRY", 0, "Geometry", ""},
     {0, NULL, 0, NULL, NULL},
 };
 
@@ -8829,6 +8831,21 @@ static void rna_def_node_socket_image(BlenderRNA *brna,
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
 }
 
+static void rna_def_node_socket_geometry(BlenderRNA *brna,
+                                         const char *identifier,
+                                         const char *interface_idname)
+{
+  StructRNA *srna;
+
+  srna = RNA_def_struct(brna, identifier, "NodeSocketStandard");
+  RNA_def_struct_ui_text(srna, "Geometry Node Socket", "Geometry socket of a node");
+  RNA_def_struct_sdna(srna, "bNodeSocket");
+
+  srna = RNA_def_struct(brna, interface_idname, "NodeSocketInterfaceStandard");
+  RNA_def_struct_ui_text(srna, "Geometry Node Socket Interface", "Geometry socket of a node");
+  RNA_def_struct_sdna(srna, "bNodeSocket");
+}
+
 static void rna_def_node_socket_standard_types(BlenderRNA *brna)
 {
   /* XXX Workaround: Registered functions are not exposed in python by bpy,
@@ -8967,6 +8984,8 @@ static void rna_def_node_socket_standard_types(BlenderRNA *brna)
   rna_def_node_socket_object(brna, "NodeSocketObject", "NodeSocketInterfaceObject");
 
   rna_def_node_socket_image(brna, "NodeSocketImage", "NodeSocketInterfaceImage");
+
+  rna_def_node_socket_geometry(brna, "NodeSocketGeometry", "NodeSocketInterfaceGeometry");
 }
 
 static void rna_def_internal_node(BlenderRNA *brna)

source/blender/nodes/intern/node_socket.cc

@@ -672,6 +672,12 @@ static bNodeSocketType *make_socket_type_object()
   return socktype;
 }
 
+static bNodeSocketType *make_socket_type_geometry()
+{
+  bNodeSocketType *socktype = make_standard_socket_type(SOCK_GEOMETRY, PROP_NONE);
+  return socktype;
+}
+
 void register_standard_node_socket_types(void)
 {
   /* draw callbacks are set in drawnode.c to avoid bad-level calls */
@@ -708,5 +714,7 @@ void register_standard_node_socket_types(void)
 
   nodeRegisterSocketType(make_standard_socket_type(SOCK_IMAGE, PROP_NONE));
 
+  nodeRegisterSocketType(make_socket_type_geometry());
+
   nodeRegisterSocketType(make_socket_type_virtual());
 }