Initial Commit

Library/PackageCache/com.unity.timeline@1.5.4/Runtime/Animation/AnimationOutputWeightProcessor.cs

@@ -0,0 +1,93 @@
+using System.Collections.Generic;
+using UnityEngine.Animations;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    // Does a post processing of the weights on an animation track to properly normalize
+    // the mixer weights so that blending does not bring default poses and subtracks, layers and
+    // layer graphs blend correctly
+    class AnimationOutputWeightProcessor : ITimelineEvaluateCallback
+    {
+        struct WeightInfo
+        {
+            public Playable mixer;
+            public Playable parentMixer;
+            public int port;
+        }
+
+        AnimationPlayableOutput m_Output;
+        AnimationMotionXToDeltaPlayable m_MotionXPlayable;
+        readonly List<WeightInfo> m_Mixers = new List<WeightInfo>();
+
+        public AnimationOutputWeightProcessor(AnimationPlayableOutput output)
+        {
+            m_Output = output;
+            output.SetWeight(0);
+            FindMixers();
+        }
+
+        void FindMixers()
+        {
+            var playable = m_Output.GetSourcePlayable();
+            var outputPort = m_Output.GetSourceOutputPort();
+
+            m_Mixers.Clear();
+            // only write the final output in playmode. it should always be 1 in editor because we blend to the defaults
+            FindMixers(playable, outputPort, playable.GetInput(outputPort));
+        }
+
+        // Recursively accumulates mixers.
+        void FindMixers(Playable parent, int port, Playable node)
+        {
+            if (!node.IsValid())
+                return;
+
+            var type = node.GetPlayableType();
+            if (type == typeof(AnimationMixerPlayable) || type == typeof(AnimationLayerMixerPlayable))
+            {
+                // use post fix traversal so children come before parents
+                int subCount = node.GetInputCount();
+                for (int j = 0; j < subCount; j++)
+                {
+                    FindMixers(node, j, node.GetInput(j));
+                }
+
+                // if we encounter a layer mixer, we assume there is nesting occuring
+                //  and we modulate the weight instead of overwriting it.
+                var weightInfo = new WeightInfo
+                {
+                    parentMixer = parent,
+                    mixer = node,
+                    port = port,
+                };
+                m_Mixers.Add(weightInfo);
+            }
+            else
+            {
+                var count = node.GetInputCount();
+                for (var i = 0; i < count; i++)
+                {
+                    FindMixers(parent, port, node.GetInput(i));
+                }
+            }
+        }
+
+        public void Evaluate()
+        {
+            float weight = 1;
+            m_Output.SetWeight(1);
+            for (int i = 0; i < m_Mixers.Count; i++)
+            {
+                var mixInfo = m_Mixers[i];
+                weight = WeightUtility.NormalizeMixer(mixInfo.mixer);
+                mixInfo.parentMixer.SetInputWeight(mixInfo.port, weight);
+            }
+
+            // only write the final weight in player/playmode. In editor, we are blending to the appropriate defaults
+            // the last mixer in the list is the final blend, since the list is composed post-order.
+            if (Application.isPlaying)
+                m_Output.SetWeight(weight);
+        }
+    }
+}