Xp vfx user keywords (#49)

* User Keywords initial work

* Update ShaderInputPropertyDrawer.cs

Prevent shadergraph from adding nodes if limit is exceeded, so it doesnt serialize and cause UI Issues.

* Update ShaderGraphImporter.cs

Bring the Importer versioning up to latest

* Adding Missing shader keyword util, from PR

Missed this due to workflow issues

Co-authored-by: Karl Kent <[email protected]>

Author: 2 people

com.unity.shadergraph/Editor/Data/Util/KeywordUtil.cs

@@ -97,6 +97,34 @@ public static string ToDefineString(this KeywordDescriptor keyword, int value)
             }
         }
 
+        public static int GetKeywordPermutationCount(this GraphData graph)
+        {
+            // Gather all unique keywords from the Graph including Sub Graphs
+            IEnumerable<ShaderKeyword> allKeywords = graph.keywords;
+            var subGraphNodes = graph.GetNodes<SubGraphNode>();
+            foreach (SubGraphNode subGraphNode in subGraphNodes)
+            {
+                if (subGraphNode.asset == null)
+                {
+                    continue;
+                }
+                allKeywords = allKeywords.Union(subGraphNode.asset.keywords);
+            }
+            allKeywords = allKeywords.Distinct();
+
+            // Get permutation count for all Keywords
+            int permutationCount = 1;
+            foreach (ShaderKeyword keyword in allKeywords)
+            {
+                if (keyword.keywordType == KeywordType.Boolean)
+                    permutationCount *= 2;
+                else
+                    permutationCount *= keyword.entries.Count;
+            }
+
+            return permutationCount;
+        }
+
         public static string GetKeywordPermutationSetConditional(List<int> permutationSet)
         {
             StringBuilder sb = new StringBuilder();