Geometry Nodes: Polish switch node UI

Based on the task T88006, there are a few simple changes
to make to improve the switch node:
- Change the label to "False" / "True" for clarity
- Change default to geometry, as it's the basic data container in
  geometry nodes.
- Change node class to `NODE_CLASS_CONVERTOR`, which was an oversight
  in the original patch.

I will add the new socket types (material and texture) in a separate commit.
Thanks to @EitanSomething for the original patch.

Differential Revision: https://developer.blender.org/D11165

source/blender/blenkernel/BKE_blender_version.h

@@ -39,7 +39,7 @@ extern "C" {
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 1
+#define BLENDER_FILE_SUBVERSION 2
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and show a warning if the file

source/blender/blenloader/intern/versioning_300.c

@@ -22,6 +22,7 @@
 
 #include "BLI_listbase.h"
 #include "BLI_math_vector.h"
+#include "BLI_string.h"
 #include "BLI_utildefines.h"
 
 #include "DNA_brush_types.h"
@@ -85,6 +86,32 @@ void do_versions_after_linking_300(Main *bmain, ReportList *UNUSED(reports))
   }
 }
 
+static void version_switch_node_input_prefix(Main *bmain)
+{
+  FOREACH_NODETREE_BEGIN (bmain, ntree, id) {
+    if (ntree->type == NTREE_GEOMETRY) {
+      LISTBASE_FOREACH (bNode *, node, &ntree->nodes) {
+        if (node->type == GEO_NODE_SWITCH) {
+          LISTBASE_FOREACH (bNodeSocket *, socket, &node->inputs) {
+            /* Skip the "switch" socket. */
+            if (socket == node->inputs.first) {
+              continue;
+            }
+            strcpy(socket->name, socket->name[0] == 'A' ? "False" : "True");
+
+            /* Replace "A" and "B", but keep the unique number suffix at the end. */
+            char number_suffix[8];
+            BLI_strncpy(number_suffix, socket->identifier + 1, sizeof(number_suffix));
+            strcpy(socket->identifier, socket->name);
+            strcat(socket->identifier, number_suffix);
+          }
+        }
+      }
+    }
+  }
+  FOREACH_NODETREE_END;
+}
+
 /* NOLINTNEXTLINE: readability-function-size */
 void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
 {
@@ -110,17 +137,10 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
       }
     }
   }
-  /**
-   * Versioning code until next subversion bump goes here.
-   *
-   * \note Be sure to check when bumping the version:
-   * - "versioning_userdef.c", #blo_do_versions_userdef
-   * - "versioning_userdef.c", #do_versions_theme
-   *
-   * \note Keep this message at the bottom of the function.
-   */
-  {
-    /* Keep this block, even when empty. */
+
+  if (!MAIN_VERSION_ATLEAST(bmain, 300, 2)) {
+    version_switch_node_input_prefix(bmain);
+
     if (!DNA_struct_elem_find(fd->filesdna, "bPoseChannel", "float", "custom_scale_xyz[3]")) {
       LISTBASE_FOREACH (Object *, ob, &bmain->objects) {
         if (ob->pose == NULL) {
@@ -132,4 +152,17 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
       }
     }
   }
+
+  /**
+   * Versioning code until next subversion bump goes here.
+   *
+   * \note Be sure to check when bumping the version:
+   * - "versioning_userdef.c", #blo_do_versions_userdef
+   * - "versioning_userdef.c", #do_versions_theme
+   *
+   * \note Keep this message at the bottom of the function.
+   */
+  {
+    /* Keep this block, even when empty. */
+  }
 }

source/blender/nodes/geometry/nodes/node_geo_switch.cc

@@ -22,24 +22,24 @@
 static bNodeSocketTemplate geo_node_switch_in[] = {
     {SOCK_BOOLEAN, N_("Switch")},
 
-    {SOCK_FLOAT, N_("A"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
-    {SOCK_FLOAT, N_("B"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
-    {SOCK_INT, N_("A"), 0, 0, 0, 0, -100000, 100000},
-    {SOCK_INT, N_("B"), 0, 0, 0, 0, -100000, 100000},
-    {SOCK_BOOLEAN, N_("A")},
-    {SOCK_BOOLEAN, N_("B")},
-    {SOCK_VECTOR, N_("A"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
-    {SOCK_VECTOR, N_("B"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
-    {SOCK_RGBA, N_("A"), 0.8, 0.8, 0.8, 1.0},
-    {SOCK_RGBA, N_("B"), 0.8, 0.8, 0.8, 1.0},
-    {SOCK_STRING, N_("A")},
-    {SOCK_STRING, N_("B")},
-    {SOCK_GEOMETRY, N_("A")},
-    {SOCK_GEOMETRY, N_("B")},
-    {SOCK_OBJECT, N_("A")},
-    {SOCK_OBJECT, N_("B")},
-    {SOCK_COLLECTION, N_("A")},
-    {SOCK_COLLECTION, N_("B")},
+    {SOCK_FLOAT, N_("False"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
+    {SOCK_FLOAT, N_("True"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
+    {SOCK_INT, N_("False"), 0, 0, 0, 0, -100000, 100000},
+    {SOCK_INT, N_("True"), 0, 0, 0, 0, -100000, 100000},
+    {SOCK_BOOLEAN, N_("False")},
+    {SOCK_BOOLEAN, N_("True")},
+    {SOCK_VECTOR, N_("False"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
+    {SOCK_VECTOR, N_("True"), 0.0, 0.0, 0.0, 0.0, -FLT_MAX, FLT_MAX},
+    {SOCK_RGBA, N_("False"), 0.8, 0.8, 0.8, 1.0},
+    {SOCK_RGBA, N_("True"), 0.8, 0.8, 0.8, 1.0},
+    {SOCK_STRING, N_("False")},
+    {SOCK_STRING, N_("True")},
+    {SOCK_GEOMETRY, N_("False")},
+    {SOCK_GEOMETRY, N_("True")},
+    {SOCK_OBJECT, N_("False")},
+    {SOCK_OBJECT, N_("True")},
+    {SOCK_COLLECTION, N_("False")},
+    {SOCK_COLLECTION, N_("True")},
     {-1, ""},
 };
 
@@ -64,7 +64,7 @@ static void geo_node_switch_layout(uiLayout *layout, bContext *UNUSED(C), Pointe
 static void geo_node_switch_init(bNodeTree *UNUSED(tree), bNode *node)
 {
   NodeSwitch *data = (NodeSwitch *)MEM_callocN(sizeof(NodeSwitch), __func__);
-  data->input_type = SOCK_FLOAT;
+  data->input_type = SOCK_GEOMETRY;
   node->storage = data;
 }
 
@@ -91,8 +91,8 @@ static void output_input(GeoNodeExecParams &params,
                          const StringRef input_suffix,
                          const StringRef output_identifier)
 {
-  const std::string name_a = "A" + input_suffix;
-  const std::string name_b = "B" + input_suffix;
+  const std::string name_a = "False" + input_suffix;
+  const std::string name_b = "True" + input_suffix;
   if (input) {
     params.set_input_unused(name_a);
     if (params.lazy_require_input(name_b)) {
@@ -165,7 +165,7 @@ void register_node_type_geo_switch()
 {
   static bNodeType ntype;
 
-  geo_node_type_base(&ntype, GEO_NODE_SWITCH, "Switch", NODE_CLASS_GEOMETRY, 0);
+  geo_node_type_base(&ntype, GEO_NODE_SWITCH, "Switch", NODE_CLASS_CONVERTOR, 0);
   node_type_socket_templates(&ntype, geo_node_switch_in, geo_node_switch_out);
   node_type_init(&ntype, geo_node_switch_init);
   node_type_update(&ntype, blender::nodes::geo_node_switch_update);