Use R11G11B10 as default HDR format on mobiles

Author: hkr

PostProcessing/Runtime/PostProcessLayer.cs

@@ -309,7 +309,7 @@ void OnPreRender()
         void BuildCommandBuffers()
         {
             var context = m_CurrentContext;
-            var sourceFormat = m_Camera.allowHDR ? RenderTextureFormat.DefaultHDR : RenderTextureFormat.Default;
+            var sourceFormat = m_Camera.allowHDR ? RuntimeUtilities.defaultHDRRenderTextureFormat : RenderTextureFormat.Default; 
 
             context.Reset();
             context.camera = m_Camera;

PostProcessing/Runtime/Utils/RuntimeUtilities.cs

@@ -6,6 +6,10 @@
 using System.Text;
 using UnityEngine.Assertions;
 
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
 namespace UnityEngine.Rendering.PostProcessing
 {
     using SceneManagement;
@@ -283,6 +287,24 @@ public static bool isAndroidOpenGL
             get { return Application.platform == RuntimePlatform.Android && SystemInfo.graphicsDeviceType != GraphicsDeviceType.Vulkan; }
         }
 
+        public static RenderTextureFormat defaultHDRRenderTextureFormat
+        {
+            get
+            {
+#if UNITY_ANDROID || UNITY_IPHONE || UNITY_TVOS || UNITY_SWITCH || UNITY_EDITOR
+                RenderTextureFormat format = RenderTextureFormat.RGB111110Float;
+#   if UNITY_EDITOR
+                var target = EditorUserBuildSettings.activeBuildTarget;
+                if (target != BuildTarget.Android && target != BuildTarget.iOS && target != BuildTarget.tvOS && target != BuildTarget.Switch)
+                    return RenderTextureFormat.DefaultHDR;
+#   endif // UNITY_EDITOR
+                if (format.IsSupported())
+                    return format;
+#endif // UNITY_ANDROID || UNITY_IPHONE || UNITY_TVOS || UNITY_SWITCH || UNITY_EDITOR
+                return RenderTextureFormat.DefaultHDR;
+            }
+        }
+
         public static void Destroy(UnityObject obj)
         {
             if (obj != null)