[Skip CI] Virtual Texturing cache settings (#536)

* Changed use of VT.System namespace to VT.Streaming namespace where the API has changed.

* Virtual Texturing HDRP cache size settings.

* VT settings UI is now shown but disabled when VT is not enabled.

* Added a tooltip to the header of the VT settings.

* Revert whitespace changes to HDRP changelog.

Co-authored-by: Nico Leyman <Nicolas@GraphineSoftware.com>
Co-authored-by: Sebastien Lagarde <sebastien@unity3d.com>

Author: 3 people

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -126,6 +126,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Implemented ray traced reflections for transparent objects.
 - Add a new parameter to control reflections in recursive rendering.
 - Added an initial version of SSGI.
+- Added Virtual Texturing cache settings to control the size of the Streaming Virtual Texturing caches.
 - Added back-compatibility with builtin stereo matrices.
 - Added CustomPassUtils API to simplify Blur, Copy and DrawRenderers custom passes.
 - Added Histogram guided automatic exposure.

com.unity.render-pipelines.high-definition/Documentation~/HDRP-Asset.md

@@ -218,3 +218,10 @@ Use these settings to enable or disable settings relating to lighting in HDRP.
 | **Grading LUT Size**   | The size of the internal and external color grading lookup textures (LUTs). This size is fixed for the Project. You can not mix and match LUT sizes, so decide on a size before you start the color grading process. The default value, **32**, provides a good balance of speed and quality. |
 | **Grading LUT Format** | Use the drop-down to select the format to encode the color grading LUTs with. Lower precision formats are faster and use less memory at the expense of color precision. These formats directly map to their equivalent in the built-in [GraphicsFormat](https://docs.unity3d.com/ScriptReference/Experimental.Rendering.GraphicsFormat.html) enum value. |
 | **Buffer Format** |  Use the drop-down to select the format of the color buffers that are used in the post-processing passes. Lower precision formats are faster and use less memory at the expense of color precision. These formats directly map to their equivalent in the built-in [GraphicsFormat](https://docs.unity3d.com/ScriptReference/Experimental.Rendering.GraphicsFormat.html) enum value. 
+
+## Virtual Texturing
+
+| **Property**            | **Description**                                                 |
+| ----------------------- | --------------------------------------------------------------- |
+| **CPU Cache Size**      | Amount of CPU memory (in MB) that can be allocated by the Streaming Virtual Texturing system to cache texture data. |
+| **GPU Cache Size per Format** | Amount of GPU memory (in MB) that can be allocated per format by the Streaming Virtual Texturing system to cache texture data. The value assigned to None is used for all unspecified formats. |

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/HDRenderPipelineUI.Skin.cs

@@ -23,7 +23,7 @@ public class GeneralSection
             public static readonly GUIContent materialSectionTitle = EditorGUIUtility.TrTextContent("Material");
             public static readonly GUIContent postProcessSectionTitle = EditorGUIUtility.TrTextContent("Post-processing");
             public static readonly GUIContent xrTitle = EditorGUIUtility.TrTextContent("XR");
-            public static readonly GUIContent virtualTexturingTitle = EditorGUIUtility.TrTextContent("Virtual Texturing");
+            public static readonly GUIContent virtualTexturingTitle = EditorGUIUtility.TrTextContent("Virtual Texturing", "Virtual Texturing Settings. These are only available when Virtual Texturing is enabled in the Player Settings.");
             public static readonly GUIContent lightLoopSubTitle = EditorGUIUtility.TrTextContent("Lights");
             public static readonly GUIContent postProcessQualitySubTitle = EditorGUIUtility.TrTextContent("Post-processing Quality Settings");
             public static readonly GUIContent lightingQualitySettings = EditorGUIUtility.TrTextContent("Lighting Quality Settings");

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/HDRenderPipelineUI.cs

@@ -68,6 +68,8 @@ internal enum SelectedFrameSettings
 
         internal static SelectedFrameSettings selectedFrameSettings;
 
+        internal static VirtualTexturingSettingsUI virtualTexturingSettingsUI = new VirtualTexturingSettingsUI();
+
         static HDRenderPipelineUI()
         {
             Inspector = CED.Group(
@@ -99,7 +101,8 @@ static HDRenderPipelineUI()
                     CED.FoldoutGroup(Styles.bloomQualitySettings, Expandable.BloomQuality, k_ExpandedState, FoldoutOption.Indent | FoldoutOption.SubFoldout | FoldoutOption.NoSpaceAtEnd, Drawer_SectionBloomQualitySettings),
                     CED.FoldoutGroup(Styles.chromaticAberrationQualitySettings, Expandable.ChromaticAberrationQuality, k_ExpandedState, FoldoutOption.Indent | FoldoutOption.SubFoldout | FoldoutOption.NoSpaceAtEnd, Drawer_SectionChromaticAberrationQualitySettings)
                     ),
-                CED.FoldoutGroup(Styles.xrTitle, Expandable.XR, k_ExpandedState, Drawer_SectionXRSettings)
+                CED.FoldoutGroup(Styles.xrTitle, Expandable.XR, k_ExpandedState, Drawer_SectionXRSettings),
+                CED.FoldoutGroup(Styles.virtualTexturingTitle, Expandable.VirtualTexturing, k_ExpandedState, Drawer_SectionVTSettings)
             );
 
             // fix init of selection along what is serialized
@@ -569,6 +572,11 @@ static void Drawer_SectionXRSettings(SerializedHDRenderPipelineAsset serialized,
             EditorGUILayout.PropertyField(serialized.renderPipelineSettings.xrSettings.cameraJitter, Styles.XRCameraJitter);
         }
 
+        static void Drawer_SectionVTSettings(SerializedHDRenderPipelineAsset serialized, Editor owner)
+        {
+            virtualTexturingSettingsUI.OnGUI(serialized, owner);
+        }
+
         static private bool m_ShowDoFLowQualitySection = false;
         static private bool m_ShowDoFMediumQualitySection = false;
         static private bool m_ShowDoFHighQualitySection = false;

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/Settings/SerializedHDRenderPipelineAsset.cs

@@ -20,6 +20,7 @@ class SerializedHDRenderPipelineAsset
         public SerializedFrameSettings defaultFrameSettings;
         public SerializedFrameSettings defaultBakedOrCustomReflectionFrameSettings;
         public SerializedFrameSettings defaultRealtimeReflectionFrameSettings;
+        public SerializedVirtualTexturingSettings virtualTexturingSettings;
 
         //RenderPipelineResources not always exist and thus cannot be serialized normally.
         public bool editorResourceHasMultipleDifferentValues
@@ -63,6 +64,8 @@ public SerializedHDRenderPipelineAsset(SerializedObject serializedObject)
             defaultFrameSettings = new SerializedFrameSettings(serializedObject.FindProperty("m_RenderingPathDefaultCameraFrameSettings"), null); //no overrides in HDRPAsset
             defaultBakedOrCustomReflectionFrameSettings = new SerializedFrameSettings(serializedObject.FindProperty("m_RenderingPathDefaultBakedOrCustomReflectionFrameSettings"), null); //no overrides in HDRPAsset
             defaultRealtimeReflectionFrameSettings = new SerializedFrameSettings(serializedObject.FindProperty("m_RenderingPathDefaultRealtimeReflectionFrameSettings"), null); //no overrides in HDRPAsset
+
+            virtualTexturingSettings = new SerializedVirtualTexturingSettings(serializedObject.FindProperty("virtualTexturingSettings"));
         }
 
         public void Update()

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/Settings/SerializedVirtualTexturingSettings.cs

@@ -0,0 +1,20 @@
+using UnityEditor.Rendering;
+using UnityEngine.Rendering.HighDefinition;
+
+namespace UnityEditor.Rendering.HighDefinition
+{
+    public sealed class SerializedVirtualTexturingSettings
+    {
+        public SerializedProperty root;
+
+        public SerializedProperty streamingCpuCacheSizeInMegaBytes;
+        public SerializedProperty streamingGpuCacheSettings;
+        public SerializedVirtualTexturingSettings(SerializedProperty root)
+        {
+            this.root = root;
+
+            streamingCpuCacheSizeInMegaBytes = root.Find((VirtualTexturingSettingsSRP s) => s.streamingCpuCacheSizeInMegaBytes);
+            streamingGpuCacheSettings = root.Find((VirtualTexturingSettingsSRP s) => s.streamingGpuCacheSettings);
+        }
+    }
+}