Merge branch 'upstream/stabilization/2106' into genewalt/gitflow_210628

Gems/Atom/RPI/Code/Source/RPI.Public/View.cpp

@@ -1,14 +1,9 @@
 /*
-* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
-* its licensors.
-*
-* For complete copyright and license terms please see the LICENSE at the root of this
-* distribution (the "License"). All use of this software is governed by the License,
-* or, if provided, by the license below or the license accompanying this file. Do not
-* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-*
-*/
+ * Copyright (c) Contributors to the Open 3D Engine Project
+ * 
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
 
 #include <Atom/RPI.Public/View.h>
 #include <Atom/RHI/RHISystemInterface.h>
@@ -160,13 +155,19 @@ namespace AZ
                         0,0,1,0,
                         0,0,0,1 };
             yUpWorld.StoreToRowMajorFloat12(viewToWorldMatrixRaw);
+            const AZ::Matrix4x4 prevViewToWorldMatrix = m_viewToWorldMatrix;
             m_viewToWorldMatrix = AZ::Matrix4x4::CreateFromRowMajorFloat16(viewToWorldMatrixRaw);
 
             m_worldToViewMatrix = m_viewToWorldMatrix.GetInverseFast();
 
             m_worldToClipMatrix = m_viewToClipMatrix * m_worldToViewMatrix;
 
-            m_onWorldToViewMatrixChange.Signal(m_worldToViewMatrix);
+            // Only signal an update when there is a change, otherwise this might block
+            // user input from changing the value.
+            if (!prevViewToWorldMatrix.IsClose(m_viewToWorldMatrix))
+            {
+                m_onWorldToViewMatrixChange.Signal(m_worldToViewMatrix);
+            }
             m_onWorldToClipMatrixChange.Signal(m_worldToClipMatrix);
 
             InvalidateSrg();