From 2dd39683358100a39d7e7774e1051136ec1df7d9 Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Fri, 24 Sep 2021 14:06:41 -0500
Subject: Geometry Nodes: Add versioning and legacy warning for random float
 node

---
 source/blender/blenloader/intern/versioning_300.c  | 27 +++++++++++++++++++++-
 .../modifiers/intern/MOD_nodes_evaluator.cc        | 10 ++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 88df4f73d45..caba972c744 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -808,6 +808,7 @@ static void version_geometry_nodes_change_legacy_names(bNodeTree *ntree)
     }
   }
 }
+
 static bool seq_transform_origin_set(Sequence *seq, void *UNUSED(user_data))
 {
   StripTransform *transform = seq->strip->transform;
@@ -1480,5 +1481,29 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
         }
       }
     }
+
+    /* Deprecate the random float node in favor of the random float node. */
+    LISTBASE_FOREACH (bNodeTree *, ntree, &bmain->nodetrees) {
+      if (ntree->type != NTREE_GEOMETRY) {
+        continue;
+      }
+      LISTBASE_FOREACH (bNode *, node, &ntree->nodes) {
+        if (node->type != FN_NODE_LEGACY_RANDOM_FLOAT) {
+          continue;
+        }
+        if (strstr(node->idname, "Legacy")) {
+          /* Make sure we haven't changed this idname already. */
+          continue;
+        }
+
+        char temp_idname[sizeof(node->idname)];
+        BLI_strncpy(temp_idname, node->idname, sizeof(node->idname));
+
+        BLI_snprintf(node->idname,
+                     sizeof(node->idname),
+                     "FunctionNodeLegacy%s",
+                     temp_idname + strlen("FunctionNode"));
+      }
+    }
   }
-}
+}
\ No newline at end of file
diff --git a/source/blender/modifiers/intern/MOD_nodes_evaluator.cc b/source/blender/modifiers/intern/MOD_nodes_evaluator.cc
index 9f296f4cfe9..fd0205cffc5 100644
--- a/source/blender/modifiers/intern/MOD_nodes_evaluator.cc
+++ b/source/blender/modifiers/intern/MOD_nodes_evaluator.cc
@@ -887,6 +887,16 @@ class GeometryNodesEvaluator {
                                    const MultiFunction &fn,
                                    NodeState &node_state)
   {
+    if (USER_EXPERIMENTAL_TEST(&U, use_geometry_nodes_fields)) {
+      if (node->idname().find("Legacy") != StringRef::not_found) {
+        /* Create geometry nodes params just for creating an error message. */
+        NodeParamsProvider params_provider{*this, node, node_state};
+        GeoNodeExecParams params{params_provider};
+        params.error_message_add(geo_log::NodeWarningType::Legacy,
+                                 TIP_("Legacy node will be removed before Blender 4.0"));
+      }
+    }
+
     LinearAllocator<> &allocator = local_allocators_.local();
 
     /* Prepare the inputs for the multi function. */
-- 
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