Generic volume framework

ScriptableRenderPipeline/Core/Volume.meta

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ScriptableRenderPipeline/Core/Volume/Editor.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ClampedFloatParameterDrawer.cs

+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [VolumeParameterDrawer(typeof(ClampedFloatParameter))]
+    sealed class ClampedFloatParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Float)
+                return false;
+
+            var o = parameter.GetObjectRef<ClampedFloatParameter>();
+
+            if (o.clampMode == ParameterClampMode.MinMax)
+            {
+                EditorGUILayout.Slider(value, o.min, o.max, title);
+                value.floatValue = Mathf.Clamp(value.floatValue, o.min, o.max);
+            }
+            else if (o.clampMode == ParameterClampMode.Min)
+            {
+                float v = EditorGUILayout.FloatField(title, value.floatValue);
+                value.floatValue = Mathf.Max(v, o.min);
+            }
+            else if (o.clampMode == ParameterClampMode.Max)
+            {
+                float v = EditorGUILayout.FloatField(title, value.floatValue);
+                value.floatValue = Mathf.Min(v, o.max);
+            }
+            else
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+
+    [VolumeParameterDrawer(typeof(InstantClampedFloatParameter))]
+    sealed class InstantClampedFloatParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Float)
+                return false;
+
+            var o = parameter.GetObjectRef<InstantClampedFloatParameter>();
+
+            if (o.clampMode == ParameterClampMode.MinMax)
+            {
+                EditorGUILayout.Slider(value, o.min, o.max, title);
+                value.floatValue = Mathf.Clamp(value.floatValue, o.min, o.max);
+            }
+            else if (o.clampMode == ParameterClampMode.Min)
+            {
+                float v = EditorGUILayout.FloatField(title, value.floatValue);
+                value.floatValue = Mathf.Max(v, o.min);
+            }
+            else if (o.clampMode == ParameterClampMode.Max)
+            {
+                float v = EditorGUILayout.FloatField(title, value.floatValue);
+                value.floatValue = Mathf.Min(v, o.max);
+            }
+            else
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ClampedFloatParameterDrawer.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ClampedIntParameterDrawer.cs

+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [VolumeParameterDrawer(typeof(ClampedIntParameter))]
+    sealed class ClampedIntParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Integer)
+                return false;
+
+            var o = parameter.GetObjectRef<ClampedIntParameter>();
+
+            if (o.clampMode == ParameterClampMode.MinMax)
+            {
+                EditorGUILayout.IntSlider(value, o.min, o.max, title);
+                value.intValue = Mathf.Clamp(value.intValue, o.min, o.max);
+            }
+            else if (o.clampMode == ParameterClampMode.Min)
+            {
+                int v = EditorGUILayout.IntField(title, value.intValue);
+                value.intValue = Mathf.Max(v, o.min);
+            }
+            else if (o.clampMode == ParameterClampMode.Max)
+            {
+                int v = EditorGUILayout.IntField(title, value.intValue);
+                value.intValue = Mathf.Min(v, o.max);
+            }
+            else
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+
+    [VolumeParameterDrawer(typeof(InstantClampedIntParameter))]
+    sealed class InstantClampedIntParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Integer)
+                return false;
+
+            var o = parameter.GetObjectRef<InstantClampedIntParameter>();
+
+            if (o.clampMode == ParameterClampMode.MinMax)
+            {
+                EditorGUILayout.IntSlider(value, o.min, o.max, title);
+                value.intValue = Mathf.Clamp(value.intValue, o.min, o.max);
+            }
+            else if (o.clampMode == ParameterClampMode.Min)
+            {
+                int v = EditorGUILayout.IntField(title, value.intValue);
+                value.intValue = Mathf.Max(v, o.min);
+            }
+            else if (o.clampMode == ParameterClampMode.Max)
+            {
+                int v = EditorGUILayout.IntField(title, value.intValue);
+                value.intValue = Mathf.Min(v, o.max);
+            }
+            else
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ClampedIntParameterDrawer.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ColorParameterDrawer.cs

+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [VolumeParameterDrawer(typeof(ColorParameter))]
+    sealed class ColorParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Color)
+                return false;
+
+            var o = parameter.GetObjectRef<ColorParameter>();
+            value.colorValue = EditorGUILayout.ColorField(title, value.colorValue, o.showEyeDropper, o.showAlpha, o.showAlpha);
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/Drawers/ColorParameterDrawer.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers/RangeParameterDrawer.cs

+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [VolumeParameterDrawer(typeof(RangeParameter))]
+    sealed class RangeParameterDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Vector2)
+                return false;
+
+            var o = parameter.GetObjectRef<RangeParameter>();
+            var v = value.vector2Value;
+
+            // The layout system breaks alignement when mixing inspector fields with custom layouted
+            // fields as soon as a scrollbar is needed in the inspector, so we'll do the layout
+            // manually instead
+            const int kFloatFieldWidth = 50;
+            const int kSeparatorWidth = 5;
+            float indentOffset = EditorGUI.indentLevel * 15f;
+            var lineRect = GUILayoutUtility.GetRect(1, EditorGUIUtility.singleLineHeight);
+            lineRect.xMin += 4f;
+            lineRect.y += 2f;
+            var labelRect = new Rect(lineRect.x, lineRect.y, EditorGUIUtility.labelWidth - indentOffset, lineRect.height);
+            var floatFieldLeft = new Rect(labelRect.xMax, lineRect.y, kFloatFieldWidth + indentOffset, lineRect.height);
+            var sliderRect = new Rect(floatFieldLeft.xMax + kSeparatorWidth - indentOffset, lineRect.y, lineRect.width - labelRect.width - kFloatFieldWidth * 2 - kSeparatorWidth * 2, lineRect.height);
+            var floatFieldRight = new Rect(sliderRect.xMax + kSeparatorWidth - indentOffset, lineRect.y, kFloatFieldWidth + indentOffset, lineRect.height);
+
+            EditorGUI.PrefixLabel(labelRect, title);
+            v.x = EditorGUI.FloatField(floatFieldLeft, v.x);
+            EditorGUI.MinMaxSlider(sliderRect, ref v.x, ref v.y, o.min, o.max);
+            v.y = EditorGUI.FloatField(floatFieldRight, v.y);
+
+            value.vector2Value = v;
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/Drawers/RangeParameterDrawer.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/Drawers/Vector4ParameterDrawer.cs

+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [VolumeParameterDrawer(typeof(Vector4Parameter))]
+    sealed class Vector4ParametrDrawer : VolumeParameterDrawer
+    {
+        public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
+        {
+            var value = parameter.value;
+
+            if (value.propertyType != SerializedPropertyType.Vector4)
+                return false;
+
+            value.vector4Value = EditorGUILayout.Vector4Field(title, value.vector4Value);
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/Drawers/Vector4ParameterDrawer.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/SerializedDataParameter.cs

+using System;
+using System.Linq;
+using System.Reflection;
+using UnityEngine.Assertions;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    public sealed class SerializedDataParameter
+    {
+        public SerializedProperty overrideState { get; private set; }
+        public SerializedProperty value { get; private set; }
+        public Attribute[] attributes { get; private set; }
+        public Type referenceType { get; private set; }
+
+        SerializedProperty m_BaseProperty;
+        object m_ReferenceValue;
+
+        public string displayName
+        {
+            get { return m_BaseProperty.displayName; }
+        }
+
+        internal SerializedDataParameter(SerializedProperty property)
+        {
+            // Find the actual property type, optional attributes & reference
+            var path = property.propertyPath.Split('.');
+            object obj = property.serializedObject.targetObject;
+            FieldInfo field = null;
+
+            foreach (var p in path)
+            {
+                field = obj.GetType().GetField(p, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
+                obj = field.GetValue(obj);
+            }
+
+            Assert.IsNotNull(field);
+
+            m_BaseProperty = property.Copy();
+            overrideState = m_BaseProperty.FindPropertyRelative("m_OverrideState");
+            value = m_BaseProperty.FindPropertyRelative("m_Value");
+            attributes = field.GetCustomAttributes(false).Cast<Attribute>().ToArray();
+            referenceType = obj.GetType();
+            m_ReferenceValue = obj;
+        }
+
+        public T GetAttribute<T>()
+            where T : Attribute
+        {
+            return (T)attributes.FirstOrDefault(x => x is T);
+        }
+
+        public T GetObjectRef<T>()
+        {
+            return (T)m_ReferenceValue;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/SerializedDataParameter.cs.meta

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ScriptableRenderPipeline/Core/Volume/Editor/VolumeComponentEditor.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using UnityEngine;
+using UnityEngine.Assertions;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+    public sealed class VolumeComponentEditorAttribute : Attribute
+    {
+        public readonly Type componentType;
+
+        public VolumeComponentEditorAttribute(Type componentType)
+        {
+            this.componentType = componentType;
+        }
+    }
+
+    public class VolumeComponentEditor
+    {
+        internal VolumeComponent target { get; private set; }
+        internal SerializedObject serializedObject { get; private set; }
+
+        internal SerializedProperty baseProperty;
+        internal SerializedProperty activeProperty;
+
+        Editor m_Inspector;
+        List<SerializedDataParameter> m_Parameters;
+
+        static Dictionary<Type, VolumeParameterDrawer> s_ParameterDrawers;
+
+        static VolumeComponentEditor()
+        {
+            s_ParameterDrawers = new Dictionary<Type, VolumeParameterDrawer>();
+            ReloadDecoratorTypes();
+        }
+
+        [Callbacks.DidReloadScripts]
+        static void OnEditorReload()
+        {
+            ReloadDecoratorTypes();
+        }
+
+        static void ReloadDecoratorTypes()
+        {
+            s_ParameterDrawers.Clear();
+
+            // Look for all the valid parameter drawers
+            var types = AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(
+                    a => a.GetTypes()
+                    .Where(
+                        t => t.IsSubclassOf(typeof(VolumeParameterDrawer))
+                        && t.IsDefined(typeof(VolumeParameterDrawerAttribute), false)
+                    )
+                );
+
+            // Store them
+            foreach (var type in types)
+            {
+                var attr = (VolumeParameterDrawerAttribute)type.GetCustomAttributes(typeof(VolumeParameterDrawerAttribute), false)[0];
+                var decorator = (VolumeParameterDrawer)Activator.CreateInstance(type);
+                s_ParameterDrawers.Add(attr.parameterType, decorator);
+            }
+        }
+
+        public void Repaint()
+        {
+            m_Inspector.Repaint();
+        }
+
+        internal void Init(VolumeComponent target, Editor inspector)
+        {
+            this.target = target;
+            m_Inspector = inspector;
+            serializedObject = new SerializedObject(target);
+            activeProperty = serializedObject.FindProperty("active");
+            OnEnable();
+        }
+
+        public virtual void OnEnable()
+        {
+            m_Parameters = new List<SerializedDataParameter>();
+
+            // Grab all valid serializable field on the VolumeComponent
+            var fields = target.GetType()
+                .GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
+                .Where(t => t.FieldType.IsSubclassOf(typeof(VolumeParameter)))
+                .Where(t =>
+                    (t.IsPublic && t.GetCustomAttributes(typeof(NonSerializedAttribute), false).Length == 0) ||
+                    (t.GetCustomAttributes(typeof(SerializeField), false).Length > 0)
+                )
+                .Where(t => t.GetCustomAttributes(typeof(HideInInspector), false).Length == 0)
+                .ToList();
+
+            // Prepare all serialized objects for this editor
+            foreach (var field in fields)
+            {
+                var property = serializedObject.FindProperty(field.Name);
+                var parameter = new SerializedDataParameter(property);
+                m_Parameters.Add(parameter);
+            }
+        }
+
+        public virtual void OnDisable()
+        {
+        }
+
+        internal void OnInternalInspectorGUI()
+        {
+            serializedObject.Update();
+            TopRowFields();
+            OnInspectorGUI();
+            EditorGUILayout.Space();
+            serializedObject.ApplyModifiedProperties();
+        }
+
+        public virtual void OnInspectorGUI()
+        {
+            // Display every field as-is
+            foreach (var parameter in m_Parameters)
+                PropertyField(parameter);
+        }
+
+        public virtual string GetDisplayTitle()
+        {
+            return ObjectNames.NicifyVariableName(target.GetType().Name);
+        }
+
+        void TopRowFields()
+        {
+            using (new EditorGUILayout.HorizontalScope())
+            {
+                if (GUILayout.Button(CoreEditorUtils.GetContent("All|Toggle all overrides on. To maximize performances you should only toggle overrides that you actually need."), CoreEditorStyles.miniLabelButton, GUILayout.Width(17f), GUILayout.ExpandWidth(false)))
+                    SetAllOverridesTo(true);
+
+                if (GUILayout.Button(CoreEditorUtils.GetContent("None|Toggle all overrides off."), CoreEditorStyles.miniLabelButton, GUILayout.Width(32f), GUILayout.ExpandWidth(false)))
+                    SetAllOverridesTo(false);
+
+                GUILayout.FlexibleSpace();
+            }
+        }
+
+        internal void SetAllOverridesTo(bool state)
+        {
+            Undo.RecordObject(target, "Toggle All");
+            target.SetAllOverridesTo(state);
+            serializedObject.Update();
+        }
+
+        // Takes a serialized VolumeParameter<T> as input
+        protected SerializedDataParameter Unpack(SerializedProperty property)
+        {
+            Assert.IsNotNull(property);
+            return new SerializedDataParameter(property);
+        }
+
+        protected void PropertyField(SerializedDataParameter property)
+        {
+            var title = CoreEditorUtils.GetContent(property.displayName);
+            PropertyField(property, title);
+        }
+
+        protected void PropertyField(SerializedDataParameter property, GUIContent title)
+        {
+            // Handle unity built-in decorators (Space, Header, Tooltip etc)
+            foreach (var attr in property.attributes)
+            {
+                if (attr is PropertyAttribute)
+                {
+                    if (attr is SpaceAttribute)
+                    {
+                        EditorGUILayout.GetControlRect(false, (attr as SpaceAttribute).height);
+                    }
+                    else if (attr is HeaderAttribute)
+                    {
+                        var rect = EditorGUILayout.GetControlRect(false, EditorGUIUtility.singleLineHeight);
+                        rect.y += 0f;
+                        rect = EditorGUI.IndentedRect(rect);
+                        EditorGUI.LabelField(rect, (attr as HeaderAttribute).header, EditorStyles.miniLabel);
+                    }
+                    else if (attr is TooltipAttribute)
+                    {
+                        if (string.IsNullOrEmpty(title.tooltip))
+                            title.tooltip = (attr as TooltipAttribute).tooltip;
+                    }
+                }
+            }
+
+            // Custom parameter drawer
+            VolumeParameterDrawer drawer;
+            s_ParameterDrawers.TryGetValue(property.referenceType, out drawer);
+
+            bool invalidProp = false;
+
+            if (drawer != null && !drawer.IsAutoProperty())
+            {
+                if (drawer.OnGUI(property, title))
+                    return;
+
+                invalidProp = true;
+            }
+
+            // ObjectParameter<T> is a special case
+            if (VolumeParameter.IsObjectParameter(property.referenceType))
+            {
+                bool expanded = property.value.isExpanded;
+                expanded = EditorGUILayout.Foldout(expanded, title, true);
+
+                if (expanded)
+                {
+                    EditorGUI.indentLevel++;
+
+                    // Not the fastest way to do it but that'll do just fine for now
+                    var it = property.value.Copy();
+                    var end = it.GetEndProperty();
+                    bool first = true;
+
+                    while (it.Next(first) && !SerializedProperty.EqualContents(it, end))
+                    {
+                        PropertyField(Unpack(it));
+                        first = false;
+                    }
+
+                    EditorGUI.indentLevel--;
+                }
+
+                property.value.isExpanded = expanded;
+                return;
+            }
+
+            using (new EditorGUILayout.HorizontalScope())
+            {
+                // Override checkbox
+                var overrideRect = GUILayoutUtility.GetRect(17f, 17f, GUILayout.ExpandWidth(false));
+                overrideRect.yMin += 4f;
+                overrideRect.xMin += EditorGUI.indentLevel * 15f;
+                DrawOverrideCheckbox(overrideRect, property.overrideState);
+
+                // Property
+                using (new EditorGUI.DisabledScope(!property.overrideState.boolValue))
+                {
+                    if (drawer != null && !invalidProp)
+                    {
+                        if (drawer.OnGUI(property, title))
+                            return;
+                    }
+
+                    // Default unity field
+                    EditorGUILayout.PropertyField(property.value, title);
+                }
+            }
+        }
+
+        void DrawOverrideCheckbox(Rect rect, SerializedProperty property)
+        {
+            var oldColor = GUI.color;
+            GUI.color = new Color(0.6f, 0.6f, 0.6f, 0.75f);
+            property.boolValue = GUI.Toggle(rect, property.boolValue, CoreEditorUtils.GetContent("|Override this setting for this volume."), CoreEditorStyles.smallTickbox);
+            GUI.color = oldColor;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/VolumeComponentEditor.cs.meta

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+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/Editor/VolumeEditor.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.Assertions;
+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [CustomEditor(typeof(Volume))]
+    public sealed class VolumeEditor : Editor
+    {
+        SerializedProperty m_IsGlobal;
+        SerializedProperty m_BlendRadius;
+        SerializedProperty m_Weight;
+        SerializedProperty m_Priority;
+        SerializedProperty m_Components;
+
+        Dictionary<Type, Type> m_EditorTypes; // Component type => Editor type
+        List<VolumeComponentEditor> m_Editors;
+
+        static VolumeComponent s_ClipboardContent;
+
+        Volume actualTarget
+        {
+            get { return target as Volume; }
+        }
+
+        void OnEnable()
+        {
+            var o = new PropertyFetcher<Volume>(serializedObject);
+            m_IsGlobal = o.Find(x => x.isGlobal);
+            m_BlendRadius = o.Find(x => x.blendDistance);
+            m_Weight = o.Find(x => x.weight);
+            m_Priority = o.Find(x => x.priority);
+            m_Components = o.Find(x => x.components);
+
+            m_EditorTypes = new Dictionary<Type, Type>();
+            m_Editors = new List<VolumeComponentEditor>();
+
+            // Gets the list of all available component editors
+            var editorTypes = AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(
+                    a => a.GetTypes()
+                    .Where(
+                        t => t.IsSubclassOf(typeof(VolumeComponentEditor))
+                          && t.IsDefined(typeof(VolumeComponentEditorAttribute), false)
+                    )
+                ).ToList();
+
+            // Map them to their corresponding component type
+            foreach (var editorType in editorTypes)
+            {
+                var attribute = (VolumeComponentEditorAttribute)editorType.GetCustomAttributes(typeof(VolumeComponentEditorAttribute), false)[0];
+                m_EditorTypes.Add(attribute.componentType, editorType);
+            }
+
+            // Create editors for existing components
+            var components = actualTarget.components;
+            for (int i = 0; i < components.Count; i++)
+                CreateEditor(components[i], m_Components.GetArrayElementAtIndex(i));
+
+            // Keep track of undo/redo to redraw the inspector when that happens
+            Undo.undoRedoPerformed += OnUndoRedoPerformed;
+        }
+
+        void OnDisable()
+        {
+            Undo.undoRedoPerformed -= OnUndoRedoPerformed;
+
+            if (m_Editors == null)
+                return; // Hasn't been inited yet
+
+            foreach (var editor in m_Editors)
+                editor.OnDisable();
+
+            m_Editors.Clear();
+            m_EditorTypes.Clear();
+        }
+
+        public override void OnInspectorGUI()
+        {
+            serializedObject.Update();
+
+            if (actualTarget.isDirty)
+            {
+                RefreshEditors();
+                actualTarget.isDirty = false;
+            }
+
+            using (var scope = new EditorGUILayout.VerticalScope())
+            {
+                EditorGUILayout.PropertyField(m_IsGlobal);
+
+                if (!m_IsGlobal.boolValue) // Blend radius is not needed for global volumes
+                {
+                    EditorGUILayout.PropertyField(m_BlendRadius);
+                    m_BlendRadius.floatValue = Mathf.Max(m_BlendRadius.floatValue, 0f);
+                }
+
+                EditorGUILayout.PropertyField(m_Weight);
+                EditorGUILayout.PropertyField(m_Priority);
+
+                EditorGUILayout.Space();
+
+                // Component list
+                for (int i = 0; i < m_Editors.Count; i++)
+                {
+                    var editor = m_Editors[i];
+                    string title = editor.GetDisplayTitle();
+                    int id = i; // Needed for closure capture below
+
+                    CoreEditorUtils.DrawSplitter();
+                    bool displayContent = CoreEditorUtils.DrawHeaderToggle(
+                        title,
+                        editor.baseProperty,
+                        editor.activeProperty,
+                        pos => OnContextClick(pos, editor.target, id)
+                    );
+
+                    if (displayContent)
+                    {
+                        using (new EditorGUI.DisabledScope(!editor.activeProperty.boolValue))
+                            editor.OnInternalInspectorGUI();
+                    }
+                }
+
+                if (m_Editors.Count > 0)
+                    CoreEditorUtils.DrawSplitter();
+                else
+                    EditorGUILayout.HelpBox("No override set on this volume.", MessageType.Info);
+
+                using (new EditorGUILayout.HorizontalScope())
+                {
+                    GUILayout.FlexibleSpace();
+
+                    //if (GUILayout.Button(CoreEditorUtils.GetContent("Add Component"), GUILayout.Width(230f), GUILayout.Height(24f)))
+                    //{
+
+                    //}
+
+                    GUILayout.FlexibleSpace();
+                }
+
+                // Handle components drag'n'drop
+                var e = Event.current;
+                if (e.type == EventType.DragUpdated)
+                {
+                    if (IsDragValid(scope.rect, e.mousePosition))
+                    {
+                        DragAndDrop.visualMode = DragAndDropVisualMode.Link;
+                        e.Use();
+                    }
+                    else
+                    {
+                        DragAndDrop.visualMode = DragAndDropVisualMode.Rejected;
+                    }
+                }
+                else if (e.type == EventType.DragPerform)
+                {
+                    if (IsDragValid(scope.rect, e.mousePosition))
+                    {
+                        DragAndDrop.AcceptDrag();
+
+                        var objs = DragAndDrop.objectReferences;
+                        foreach (var o in objs)
+                        {
+                            var compType = ((MonoScript)o).GetClass();
+                            AddComponent(compType);
+                        }
+
+                        e.Use();
+                    }
+                }
+            }
+
+            serializedObject.ApplyModifiedProperties();
+        }
+
+        bool IsDragValid(Rect rect, Vector2 mousePos)
+        {
+            if (!rect.Contains(mousePos))
+                return false;
+
+            var objs = DragAndDrop.objectReferences;
+            foreach (var o in objs)
+            {
+                if (o.GetType() != typeof(MonoScript))
+                    return false;
+
+                var script = (MonoScript)o;
+                var scriptType = script.GetClass();
+
+                if (!scriptType.IsSubclassOf(typeof(VolumeComponent)))
+                    return false;
+
+                if (actualTarget.components.Exists(t => t.GetType() == scriptType))
+                    return false;
+            }
+
+            return true;
+        }
+
+        void RefreshEditors()
+        {
+            // Disable all editors first
+            foreach (var editor in m_Editors)
+                editor.OnDisable();
+
+            // Remove them
+            m_Editors.Clear();
+
+            // Recreate editors for existing settings, if any
+            for (int i = 0; i < actualTarget.components.Count; i++)
+                CreateEditor(actualTarget.components[i], m_Components.GetArrayElementAtIndex(i));
+        }
+
+        // index is only used when we need to re-create a component in a specific spot (e.g. reset)
+        void CreateEditor(VolumeComponent settings, SerializedProperty property, int index = -1)
+        {
+            var settingsType = settings.GetType();
+            Type editorType;
+
+            if (!m_EditorTypes.TryGetValue(settingsType, out editorType))
+                editorType = typeof(VolumeComponentEditor);
+
+            var editor = (VolumeComponentEditor)Activator.CreateInstance(editorType);
+            editor.Init(settings, this);
+            editor.baseProperty = property.Copy();
+
+            if (index < 0)
+                m_Editors.Add(editor);
+            else
+                m_Editors[index] = editor;
+        }
+
+        void AddComponent(Type type)
+        {
+            serializedObject.Update();
+
+            var component = (VolumeComponent)CreateInstance(type);
+            Undo.RegisterCreatedObjectUndo(component, "Add Volume Component");
+
+            // Grow the list first, then add - that's how serialized lists work in Unity
+            m_Components.arraySize++;
+            var effectProp = m_Components.GetArrayElementAtIndex(m_Components.arraySize - 1);
+            effectProp.objectReferenceValue = component;
+
+            // Create & store the internal editor object for this effect
+            CreateEditor(component, effectProp);
+
+            serializedObject.ApplyModifiedProperties();
+        }
+
+        void RemoveComponent(int id)
+        {
+            // Huh. Hack to keep foldout state on the next element...
+            bool nextFoldoutState = false;
+            if (id < m_Editors.Count - 1)
+                nextFoldoutState = m_Editors[id + 1].baseProperty.isExpanded;
+
+            // Remove from the cached editors list
+            m_Editors[id].OnDisable();
+            m_Editors.RemoveAt(id);
+
+            serializedObject.Update();
+
+            var property = m_Components.GetArrayElementAtIndex(id);
+            var effect = property.objectReferenceValue;
+
+            // Unassign it (should be null already but serialization does funky things
+            property.objectReferenceValue = null;
+
+            // ...and remove the array index itself from the list
+            m_Components.DeleteArrayElementAtIndex(id);
+
+            // Finally refresh editor reference to the serialized settings list
+            for (int i = 0; i < m_Editors.Count; i++)
+                m_Editors[i].baseProperty = m_Components.GetArrayElementAtIndex(i).Copy();
+
+            // Set the proper foldout state if needed
+            if (id < m_Editors.Count)
+                m_Editors[id].baseProperty.isExpanded = nextFoldoutState;
+
+            serializedObject.ApplyModifiedProperties();
+
+            // Destroy the setting object after ApplyModifiedProperties(). If we do it before, redo
+            // actions will be in the wrong order and the reference to the setting object in the
+            // list will be lost.
+            Undo.DestroyObjectImmediate(effect);
+        }
+
+        // Reset is done by deleting and removing the object from the list and adding a new one in
+        // the same spot as it was before
+        void ResetComponent(Type type, int id)
+        {
+            // Remove from the cached editors list
+            m_Editors[id].OnDisable();
+            m_Editors[id] = null;
+
+            serializedObject.Update();
+
+            var property = m_Components.GetArrayElementAtIndex(id);
+            var prevSettings = property.objectReferenceValue;
+
+            // Unassign it but down remove it from the array to keep the index available
+            property.objectReferenceValue = null;
+
+            // Create a new object
+            var newEffect = (VolumeComponent)CreateInstance(type);
+            Undo.RegisterCreatedObjectUndo(newEffect, "Reset Volume Component");
+
+            // Put it in the reserved space
+            property.objectReferenceValue = newEffect;
+
+            // Create & store the internal editor object for this effect
+            CreateEditor(newEffect, property, id);
+
+            serializedObject.ApplyModifiedProperties();
+
+            // Same as RemoveComponent, destroy at the end so it's recreated first on Undo to make
+            // sure the GUID exists before undoing the list state
+            Undo.DestroyObjectImmediate(prevSettings);
+        }
+
+        void OnContextClick(Vector2 position, VolumeComponent targetComponent, int id)
+        {
+            var menu = new GenericMenu();
+            menu.AddItem(CoreEditorUtils.GetContent("Reset"), false, () => ResetComponent(targetComponent.GetType(), id));
+            menu.AddItem(CoreEditorUtils.GetContent("Remove"), false, () => RemoveComponent(id));
+            menu.AddSeparator(string.Empty);
+            menu.AddItem(CoreEditorUtils.GetContent("Copy Settings"), false, () => CopySettings(targetComponent));
+
+            if (CanPaste(targetComponent))
+                menu.AddItem(CoreEditorUtils.GetContent("Paste Settings"), false, () => PasteSettings(targetComponent));
+            else
+                menu.AddDisabledItem(CoreEditorUtils.GetContent("Paste Settings"));
+
+            menu.AddSeparator(string.Empty);
+            menu.AddItem(CoreEditorUtils.GetContent("Toggle All"), false, () => m_Editors[id].SetAllOverridesTo(true));
+            menu.AddItem(CoreEditorUtils.GetContent("Toggle None"), false, () => m_Editors[id].SetAllOverridesTo(false));
+
+            menu.DropDown(new Rect(position, Vector2.zero));
+        }
+
+        // Copy/pasting is simply done by creating an in memory copy of the selected component and
+        // copying over the serialized data to another; it doesn't use nor affect the OS clipboard
+        bool CanPaste(VolumeComponent targetComponent)
+        {
+            return s_ClipboardContent != null
+                && s_ClipboardContent.GetType() == targetComponent.GetType();
+        }
+
+        void CopySettings(VolumeComponent targetComponent)
+        {
+            if (s_ClipboardContent != null)
+            {
+                CoreUtils.Destroy(s_ClipboardContent);
+                s_ClipboardContent = null;
+            }
+
+            s_ClipboardContent = (VolumeComponent)CreateInstance(targetComponent.GetType());
+            EditorUtility.CopySerializedIfDifferent(targetComponent, s_ClipboardContent);
+        }
+
+        void PasteSettings(VolumeComponent targetComponent)
+        {
+            Assert.IsNotNull(s_ClipboardContent);
+            Assert.AreEqual(s_ClipboardContent.GetType(), targetComponent.GetType());
+
+            Undo.RecordObject(targetComponent, "Paste Settings");
+            EditorUtility.CopySerializedIfDifferent(s_ClipboardContent, targetComponent);
+        }
+
+        void OnUndoRedoPerformed()
+        {
+            actualTarget.isDirty = true;
+
+            // Dumb hack to make sure the serialized object is up to date on undo
+            serializedObject.Update();
+            serializedObject.ApplyModifiedProperties();
+
+            // Seems like there's an issue with the inspector not repainting after some undo events
+            // This will take care of that
+            Repaint();
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/VolumeEditor.cs.meta

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+guid: 9a033a261241d6e48af8ca011ab7c5c1
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+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/Editor/VolumeParameterDrawer.cs

+using System;
+using UnityEngine;
+
+namespace UnityEditor.Experimental.Rendering
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+    public sealed class VolumeParameterDrawerAttribute : Attribute
+    {
+        public readonly Type parameterType;
+
+        public VolumeParameterDrawerAttribute(Type parameterType)
+        {
+            this.parameterType = parameterType;
+        }
+    }
+
+    // Default parameter drawer - simply displays the serialized property as Unity would
+    public abstract class VolumeParameterDrawer
+    {
+        // Override this and return false if you want to customize the override checkbox position,
+        // else it'll automatically draw it and put the property content in a horizontal scope.
+        public virtual bool IsAutoProperty()
+        {
+            return true;
+        }
+
+        // Return false is the input parameter is invalid - unity will display the default editor
+        // for this control then
+        public abstract bool OnGUI(SerializedDataParameter parameter, GUIContent title);
+    }
+}

ScriptableRenderPipeline/Core/Volume/Editor/VolumeParameterDrawer.cs.meta

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+guid: d8ce10b4215bd81438b65f7e23ac0946
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+  icon: {instanceID: 0}
+  userData: 
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+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/Volume.cs

+using System;
+using System.Collections.Generic;
+
+namespace UnityEngine.Experimental.Rendering
+{
+    [ExecuteInEditMode]
+    public class Volume : MonoBehaviour
+    {
+        [Tooltip("A global volume is applied to the whole scene.")]
+        public bool isGlobal = false;
+
+        [Tooltip("Volume priority in the stack. Higher number means higher priority. Negative values are supported.")]
+        public float priority = 0f;
+
+        [Tooltip("Outer distance to start blending from. A value of 0 means no blending and the volume overrides will be applied immediatly upon entry.")]
+        public float blendDistance = 0f;
+
+        [Range(0f, 1f), Tooltip("Total weight of this volume in the scene. 0 means it won't do anything, 1 means full effect.")]
+        public float weight = 1f;
+
+        public List<VolumeComponent> components = new List<VolumeComponent>();
+
+        // Editor-only
+        [NonSerialized]
+        public bool isDirty;
+
+        // Needed for state tracking (see the comments in Update)
+        int m_PreviousLayer;
+        float m_PreviousPriority;
+
+        void OnEnable()
+        {
+            // Make sure every setting is valid. If a profile holds a script that doesn't exist
+            // anymore, nuke it to keep the volume clean. Note that if you delete a script that is
+            // currently in use in a volume you'll still get a one-time error in the console, it's
+            // harmless and happens because Unity does a redraw of the editor (and thus the current
+            // frame) before the recompilation step.
+            components.RemoveAll(x => x == null);
+
+            m_PreviousLayer = gameObject.layer;
+            VolumeManager.instance.Register(this, m_PreviousLayer);
+        }
+
+        void OnDisable()
+        {
+            VolumeManager.instance.Unregister(this, gameObject.layer);
+        }
+
+        void Reset()
+        {
+            isDirty = true;
+        }
+
+        void Update()
+        {
+            // Unfortunately we need to track the current layer to update the volume manager in
+            // real-time as the user could change it at any time in the editor or at runtime.
+            // Because no event is raised when the layer changes, we have to track it on every
+            // frame :/
+            int layer = gameObject.layer;
+            if (layer != m_PreviousLayer)
+            {
+                VolumeManager.instance.UpdateVolumeLayer(this, m_PreviousLayer, layer);
+                m_PreviousLayer = layer;
+            }
+
+            // Same for priority. We could use a property instead, but it doesn't play nice with the
+            // serialization system. Using a custom Attribute/PropertyDrawer for a property is
+            // possible but it doesn't work with Undo/Redo in the editor, which makes it useless for
+            // our case.
+            if (priority != m_PreviousPriority)
+            {
+                VolumeManager.instance.SetLayerDirty(layer);
+                m_PreviousPriority = priority;
+            }
+        }
+
+        public T Add<T>(bool overrides = false)
+            where T : VolumeComponent
+        {
+            if (Has<T>())
+                throw new InvalidOperationException("Component already exists in the volume");
+
+            var component = ScriptableObject.CreateInstance<T>();
+            component.SetAllOverridesTo(overrides);
+            isDirty = true;
+            return component;
+        }
+
+        public void Remove<T>()
+            where T : VolumeComponent
+        {
+            int toRemove = -1;
+            var type = typeof(T);
+
+            for (int i = 0; i < components.Count; i++)
+            {
+                if (components[i].GetType() == type)
+                {
+                    toRemove = i;
+                    break;
+                }
+            }
+
+            if (toRemove >= 0)
+            {
+                components.RemoveAt(toRemove);
+                isDirty = true;
+            }
+        }
+
+        public bool Has<T>()
+            where T : VolumeComponent
+        {
+            var type = typeof(T);
+
+            foreach (var component in components)
+            {
+                if (component.GetType() == type)
+                    return true;
+            }
+
+            return false;
+        }
+
+        public bool TryGet<T>(out T component)
+            where T : VolumeComponent
+        {
+            var type = typeof(T);
+            component = null;
+
+            foreach (var comp in components)
+            {
+                if (comp.GetType() == type)
+                {
+                    component = (T)comp;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/Volume.cs.meta

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+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/VolumeComponent.cs

+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Reflection;
+using System.Linq;
+
+namespace UnityEngine.Experimental.Rendering
+{
+    [Serializable]
+    public class VolumeComponent : ScriptableObject
+    {
+        // Used to control the state of this override - handy to quickly turn a volume override
+        // on & off in the editor
+        public bool active = true;
+
+        internal ReadOnlyCollection<VolumeParameter> parameters { get; private set; }
+
+        void OnEnable()
+        {
+            // Automatically grab all fields of type VolumeParameter for this instance
+            parameters = this.GetType()
+                .GetFields(BindingFlags.Public | BindingFlags.Instance)
+                .Where(t => t.FieldType.IsSubclassOf(typeof(VolumeParameter)))
+                .OrderBy(t => t.MetadataToken) // Guaranteed order
+                .Select(t => (VolumeParameter)t.GetValue(this))
+                .ToList()
+                .AsReadOnly();
+        }
+
+        public void SetAllOverridesTo(bool state)
+        {
+            SetAllOverridesTo(parameters, state);
+        }
+
+        void SetAllOverridesTo(IEnumerable<VolumeParameter> enumerable, bool state)
+        {
+            foreach (var prop in enumerable)
+            {
+                prop.overrideState = state;
+                var t = prop.GetType();
+
+                if (VolumeParameter.IsObjectParameter(t))
+                {
+                    // This method won't be called a lot but this is sub-optimal, fix me
+                    var innerParams = (ReadOnlyCollection<VolumeParameter>)
+                        t.GetProperty("parameters", BindingFlags.NonPublic | BindingFlags.Instance)
+                         .GetValue(prop, null);
+
+                    if (innerParams != null)
+                        SetAllOverridesTo(innerParams, state);
+                }
+            }
+        }
+
+        // Custom hashing function used to compare the state of settings (it's not meant to be
+        // unique but to be a quick way to check if two setting sets have the same state or not).
+        // Hash collision rate should be pretty low.
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                //return parameters.Aggregate(17, (i, p) => i * 23 + p.GetHash());
+
+                int hash = 17;
+
+                foreach (var p in parameters)
+                    hash = hash * 23 + p.GetHashCode();
+
+                return hash;
+            }
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/VolumeComponent.cs.meta

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+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/VolumeManager.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine.Assertions;
+
+namespace UnityEngine.Experimental.Rendering
+{
+    public sealed class VolumeManager
+    {
+        //>>> System.Lazy<T> is broken in Unity (legacy runtime) so we'll have to do it ourselves :|
+        static volatile VolumeManager s_Instance;
+        static object s_LockObj = new Object();
+
+        public static VolumeManager instance
+        {
+            get
+            {
+                // Double-lock checking
+                if (s_Instance == null)
+                {
+                    lock (s_LockObj) // Lock on a separate object to avoid deadlocks
+                    {
+                        if (s_Instance == null)
+                            s_Instance = new VolumeManager();
+                    }
+                }
+
+                return s_Instance;
+            }
+        }
+        //<<<
+
+        // Max amount of layers available in Unity
+        const int k_MaxLayerCount = 32;
+
+        // List of all volumes (sorted by priority) per layer
+        readonly List<Volume>[] m_Volumes;
+
+        // Keep track of sorting states for all layers
+        readonly bool[] m_SortNeeded;
+
+        // Internal state of all component types
+        readonly Dictionary<Type, VolumeComponent> m_Components;
+
+        // Internal list of default state for each component type - this is used to reset component
+        // states on update instead of having to implement a Reset method on all components (which
+        // would be error-prone)
+        readonly List<VolumeComponent> m_ComponentsDefaultState;
+
+        // Recycled list used for volume traversal
+        readonly List<Collider> m_TempColliders;
+
+        // In the editor, when entering play-mode, it will call the constructor and OnEditorReload()
+        // which in turn will call ReloadBaseTypes() twice, so we need to keep track of the reloads
+        // to avoid wasting any more CPU than required
+        static bool s_StopReloads = false;
+
+        VolumeManager()
+        {
+            m_Volumes = new List<Volume>[k_MaxLayerCount];
+            m_SortNeeded = new bool[k_MaxLayerCount];
+            m_TempColliders = new List<Collider>(8);
+            m_Components = new Dictionary<Type, VolumeComponent>();
+            m_ComponentsDefaultState = new List<VolumeComponent>();
+
+            ReloadBaseTypes();
+        }
+
+#if UNITY_EDITOR
+        // Called every time Unity recompiles scripts in the editor. We need this to keep track of
+        // any new custom component the user might add to the project.
+        [UnityEditor.Callbacks.DidReloadScripts]
+        static void OnEditorReload()
+        {
+            if (!s_StopReloads)
+                instance.ReloadBaseTypes();
+
+            s_StopReloads = false;
+        }
+#endif
+
+        // This will be called only once at runtime and everytime script reload kicks-in in the
+        // editor as we need to keep track of any compatible component in the project
+        void ReloadBaseTypes()
+        {
+            // Clean component map & default states
+            foreach (var component in m_Components)
+                CoreUtils.Destroy(component.Value);
+
+            foreach (var component in m_ComponentsDefaultState)
+                CoreUtils.Destroy(component);
+
+            m_Components.Clear();
+            m_ComponentsDefaultState.Clear();
+
+            // Rebuild it from scratch
+            var types = AppDomain.CurrentDomain.GetAssemblies()
+                            .SelectMany(
+                                a => a.GetTypes()
+                                .Where(
+                                    t => t.IsSubclassOf(typeof(VolumeComponent))
+                                )
+                            );
+
+            foreach (var type in types)
+            {
+                // We need two instances, one for global state tracking and another one to keep a
+                // default state that will act as the lowest priority global volume (so that we have
+                // a state to fallback to when exiting volumes)
+                var inst = (VolumeComponent)ScriptableObject.CreateInstance(type);
+                m_Components.Add(type, inst);
+
+                inst = (VolumeComponent)ScriptableObject.CreateInstance(type);
+                inst.SetAllOverridesTo(true);
+                m_ComponentsDefaultState.Add(inst);
+            }
+
+            s_StopReloads = true;
+        }
+
+        public T GetComponent<T>()
+            where T : VolumeComponent
+        {
+            var comp = GetComponent(typeof(T));
+            return (T)comp;
+        }
+
+        public VolumeComponent GetComponent(Type type)
+        {
+            VolumeComponent comp;
+            m_Components.TryGetValue(type, out comp);
+            Assert.IsNotNull(comp, "Component map is corrupted, \"" + type + "\" not found");
+            return comp;
+        }
+
+        public void Register(Volume volume, int layer)
+        {
+            var volumes = m_Volumes[layer];
+
+            if (volumes == null)
+            {
+                volumes = new List<Volume>();
+                m_Volumes[layer] = volumes;
+            }
+
+            Assert.IsFalse(volumes.Contains(volume), "Volume has already been registered");
+            volumes.Add(volume);
+            SetLayerDirty(layer);
+        }
+
+        public void Unregister(Volume volume, int layer)
+        {
+            var volumes = m_Volumes[layer];
+
+            if (volumes == null)
+                return;
+
+            volumes.Remove(volume);
+        }
+
+        internal void SetLayerDirty(int layer)
+        {
+            Assert.IsTrue(layer >= 0 && layer <= k_MaxLayerCount, "Invalid layer bit");
+            m_SortNeeded[layer] = true;
+        }
+
+        internal void UpdateVolumeLayer(Volume volume, int prevLayer, int newLayer)
+        {
+            Assert.IsTrue(prevLayer >= 0 && prevLayer <= k_MaxLayerCount, "Invalid layer bit");
+            Unregister(volume, prevLayer);
+            Register(volume, newLayer);
+        }
+
+        // Go through all listed components and lerp overriden values in the global state
+        void OverrideData(List<VolumeComponent> components, float interpFactor)
+        {
+            foreach (var component in components)
+            {
+                if (!component.active)
+                    continue;
+
+                var target = GetComponent(component.GetType());
+                int count = component.parameters.Count;
+
+                for (int i = 0; i < count; i++)
+                {
+                    var toParam = component.parameters[i];
+                    if (toParam.overrideState)
+                    {
+                        var fromParam = target.parameters[i];
+                        fromParam.Interp(fromParam, toParam, interpFactor);
+                    }
+                }
+            }
+        }
+
+        // Faster version of OverrideData to force replace values in the global state
+        void ReplaceData(List<VolumeComponent> components)
+        {
+            foreach (var component in components)
+            {
+                var target = GetComponent(component.GetType());
+                int count = component.parameters.Count;
+
+                for (int i = 0; i < count; i++)
+                    target.parameters[i].SetValue(component.parameters[i]);
+            }
+        }
+
+        // Update the global state - should be called once per frame in the update loop before
+        // anything else
+        public void Update(Transform trigger, LayerMask layerMask)
+        {
+#if UNITY_EDITOR
+            // Editor specific hack to work around serialization doing funky things when exiting
+            // play mode -> re-create the world when bad things happen
+            if (m_ComponentsDefaultState == null
+            || (m_ComponentsDefaultState.Count > 0 && m_ComponentsDefaultState[0] == null))
+            {
+                ReloadBaseTypes();
+            }
+            else
+#endif
+            {
+                // Start by resetting the global state to default values
+                ReplaceData(m_ComponentsDefaultState);
+            }
+
+            // Do magic
+            bool onlyGlobal = trigger == null;
+            int mask = layerMask.value;
+            var triggerPos = onlyGlobal ? Vector3.zero : trigger.position;
+
+            for (int i = 0; i < k_MaxLayerCount; i++)
+            {
+                // Skip layers not in the mask
+                if ((mask & (1 << i)) == 0)
+                    continue;
+
+                // Skip empty layers
+                var volumes = m_Volumes[i];
+
+                if (volumes == null)
+                    continue;
+
+                // Sort the volume list if needed
+                if (m_SortNeeded[i])
+                {
+                    SortByPriority(volumes);
+                    m_SortNeeded[i] = false;
+                }
+
+                // Traverse all volumes
+                foreach (var volume in volumes)
+                {
+                    // Skip disabled volumes and volumes without any data or weight
+                    if (!volume.enabled || volume.weight <= 0f)
+                        continue;
+
+                    var components = volume.components;
+
+                    // Global volumes always have influence
+                    if (volume.isGlobal)
+                    {
+                        OverrideData(components, Mathf.Clamp01(volume.weight));
+                        continue;
+                    }
+
+                    if (onlyGlobal)
+                        continue;
+
+                    // If volume isn't global and has no collider, skip it as it's useless
+                    var colliders = m_TempColliders;
+                    volume.GetComponents(colliders);
+                    if (colliders.Count == 0)
+                        continue;
+
+                    // Find closest distance to volume, 0 means it's inside it
+                    float closestDistanceSqr = float.PositiveInfinity;
+
+                    foreach (var collider in colliders)
+                    {
+                        if (!collider.enabled)
+                            continue;
+
+                        var closestPoint = collider.ClosestPoint(triggerPos);
+                        var d = (closestPoint - triggerPos).sqrMagnitude;
+
+                        if (d < closestDistanceSqr)
+                            closestDistanceSqr = d;
+                    }
+
+                    colliders.Clear();
+                    float blendDistSqr = volume.blendDistance * volume.blendDistance;
+
+                    // Volume has no influence, ignore it
+                    // Note: Volume doesn't do anything when `closestDistanceSqr = blendDistSqr` but
+                    //       we can't use a >= comparison as blendDistSqr could be set to 0 in which
+                    //       case volume would have total influence
+                    if (closestDistanceSqr > blendDistSqr)
+                        continue;
+
+                    // Volume has influence
+                    float interpFactor = 1f;
+
+                    if (blendDistSqr > 0f)
+                        interpFactor = 1f - (closestDistanceSqr / blendDistSqr);
+
+                    // No need to clamp01 the interpolation factor as it'll always be in [0;1[ range
+                    OverrideData(components, interpFactor * Mathf.Clamp01(volume.weight));
+                }
+            }
+        }
+
+        // Stable insertion sort. Faster than List<T>.Sort() for our needs.
+        static void SortByPriority(List<Volume> volumes)
+        {
+            Assert.IsNotNull(volumes, "Trying to sort volumes of non-initialized layer");
+
+            for (int i = 1; i < volumes.Count; i++)
+            {
+                var temp = volumes[i];
+                int j = i - 1;
+
+                // Sort order is ascending
+                while (j >= 0 && volumes[j].priority > temp.priority)
+                {
+                    volumes[j + 1] = volumes[j];
+                    j--;
+                }
+
+                volumes[j + 1] = temp;
+            }
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/VolumeManager.cs.meta

+fileFormatVersion: 2
+guid: f709aacbf8d0b0048889f52315d67d58
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

ScriptableRenderPipeline/Core/Volume/VolumeParameter.cs

+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reflection;
+
+namespace UnityEngine.Experimental.Rendering
+{
+    // We need this base class to be able to store a list of VolumeParameter in collections as we
+    // can't store VolumeParameter<T> with variable T types in the same collection. As a result some
+    // of the following is a bit hacky...
+    public abstract class VolumeParameter
+    {
+        [SerializeField]
+        protected bool m_OverrideState;
+
+        public virtual bool overrideState
+        {
+            get { return m_OverrideState; }
+            set { m_OverrideState = value; }
+        }
+
+        internal abstract void Interp(VolumeParameter from, VolumeParameter to, float t);
+
+        public T GetValue<T>()
+        {
+            return ((VolumeParameter<T>)this).value;
+        }
+
+        internal abstract void SetValue(VolumeParameter parameter);
+
+        public static bool IsObjectParameter(Type type)
+        {
+            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(ObjectParameter<>))
+                return true;
+
+            return type.BaseType != null
+                && IsObjectParameter(type.BaseType);
+        }
+    }
+
+    [Serializable]
+    public class VolumeParameter<T> : VolumeParameter
+    {
+        [SerializeField]
+        protected T m_Value;
+
+        public virtual T value
+        {
+            get { return m_Value; }
+            set { m_Value = value; }
+        }
+
+        public VolumeParameter()
+            : this(default(T), false)
+        {
+        }
+
+        protected VolumeParameter(T value, bool overrideState)
+        {
+            m_Value = value;
+            this.overrideState = overrideState;
+        }
+
+        internal override void Interp(VolumeParameter from, VolumeParameter to, float t)
+        {
+            // Note: this is relatively unsafe (assumes that from and to are both holding type T)
+            Interp(from.GetValue<T>(), to.GetValue<T>(), t);
+        }
+
+        public virtual void Interp(T from, T to, float t)
+        {
+            // Returns `b` if `dt > 0` by default so we don't have to write overrides for bools and
+            // enumerations.
+            m_Value = t > 0f ? to : from;
+        }
+
+        public void Override(T x)
+        {
+            overrideState = true;
+            m_Value = x;
+        }
+
+        internal override void SetValue(VolumeParameter parameter)
+        {
+            m_Value = parameter.GetValue<T>();
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                int hash = 17;
+                hash = hash * 23 + overrideState.GetHashCode();
+                hash = hash * 23 + value.GetHashCode();
+                return hash;
+            }
+        }
+
+        //
+        // Implicit conversion; assuming the following:
+        //
+        //   var myFloatProperty = new ParameterOverride<float> { value = 42f; };
+        //
+        // It allows for implicit casts:
+        //
+        //   float myFloat = myFloatProperty.value; // No implicit cast
+        //   float myFloat = myFloatProperty;       // Implicit cast
+        //
+        // For safety reason this is one-way only.
+        //
+        public static implicit operator T(VolumeParameter<T> prop)
+        {
+            return prop.m_Value;
+        }
+    }
+
+    public enum ParameterClampMode
+    {
+        Min,
+        Max,
+        MinMax
+    }
+
+    //
+    // The serialization system in Unity can't serialize generic types, the workaround is to extend
+    // and flatten pre-defined generic types.
+    // For enums it's recommended to make your own types on the spot, like so:
+    //
+    //  [Serializable]
+    //  public sealed class MyEnumParameter : VolumeParameter<MyEnum> { }
+    //  public enum MyEnum { One, Two }
+    //
+
+    [Serializable]
+    public sealed class BoolParameter : VolumeParameter<bool> { }
+
+    [Serializable]
+    public sealed class IntParameter : VolumeParameter<int>
+    {
+        public override void Interp(int from, int to, float t)
+        {
+            // Int snapping interpolation. Don't use this for enums as they don't necessarily have
+            // contiguous values. Use the default interpolator instead (same as bool).
+            m_Value = (int)(from + (to - from) * t);
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantIntParameter : VolumeParameter<int> { }
+
+    [Serializable]
+    public sealed class ClampedIntParameter : VolumeParameter<int>
+    {
+        public ParameterClampMode clampMode = ParameterClampMode.MinMax;
+        public int min = 0;
+        public int max = 10;
+
+        public override int value
+        {
+            get { return m_Value; }
+            set
+            {
+                switch (clampMode)
+                {
+                    case ParameterClampMode.Min: m_Value = Mathf.Max(min, value); break;
+                    case ParameterClampMode.Max: m_Value = Mathf.Min(max, value); break;
+                    case ParameterClampMode.MinMax: m_Value = Mathf.Clamp(value, min, max); break;
+                }
+            }
+        }
+
+        public override void Interp(int from, int to, float t)
+        {
+            m_Value = (int)(from + (to - from) * t);
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantClampedIntParameter : VolumeParameter<int>
+    {
+        public ParameterClampMode clampMode = ParameterClampMode.MinMax;
+        public int min = 0;
+        public int max = 10;
+
+        public override int value
+        {
+            get { return m_Value; }
+            set
+            {
+                switch (clampMode)
+                {
+                    case ParameterClampMode.Min: m_Value = Mathf.Max(min, value); break;
+                    case ParameterClampMode.Max: m_Value = Mathf.Min(max, value); break;
+                    case ParameterClampMode.MinMax: m_Value = Mathf.Clamp(value, min, max); break;
+                }
+            }
+        }
+    }
+
+    [Serializable]
+    public sealed class FloatParameter : VolumeParameter<float>
+    {
+        public override void Interp(float from, float to, float t)
+        {
+            m_Value = from + (to - from) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantFloatParameter : VolumeParameter<float> { }
+
+    [Serializable]
+    public sealed class ClampedFloatParameter : VolumeParameter<float>
+    {
+        public ParameterClampMode clampMode = ParameterClampMode.MinMax;
+        public float min = 0f;
+        public float max = 1f;
+
+        public override float value
+        {
+            get { return m_Value; }
+            set
+            {
+                switch (clampMode)
+                {
+                    case ParameterClampMode.Min: m_Value = Mathf.Max(min, value); break;
+                    case ParameterClampMode.Max: m_Value = Mathf.Min(max, value); break;
+                    case ParameterClampMode.MinMax: m_Value = Mathf.Clamp(value, min, max); break;
+                }
+            }
+        }
+
+        // We could override FloatParameter here but that would require making it not-sealed which
+        // will stop the compiler from doing specific optimizations on virtual methods - considering
+        // how often float is used, duplicating the code in this case is a definite win
+        public override void Interp(float from, float to, float t)
+        {
+            m_Value = from + (to - from) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantClampedFloatParameter : VolumeParameter<float>
+    {
+        public ParameterClampMode clampMode = ParameterClampMode.MinMax;
+        public float min = 0f;
+        public float max = 1f;
+
+        public override float value
+        {
+            get { return m_Value; }
+            set
+            {
+                switch (clampMode)
+                {
+                    case ParameterClampMode.Min: m_Value = Mathf.Max(min, value); break;
+                    case ParameterClampMode.Max: m_Value = Mathf.Min(max, value); break;
+                    case ParameterClampMode.MinMax: m_Value = Mathf.Clamp(value, min, max); break;
+                }
+            }
+        }
+    }
+
+    // Holds a min & a max values clamped in a range (MinMaxSlider in the editor)
+    [Serializable]
+    public sealed class RangeParameter : VolumeParameter<Vector2>
+    {
+        public float min = 0;
+        public float max = 1;
+
+        public override Vector2 value
+        {
+            get { return m_Value; }
+            set
+            {
+                m_Value.x = Mathf.Max(value.x, min);
+                m_Value.y = Mathf.Min(value.y, max);
+            }
+        }
+
+        public override void Interp(Vector2 from, Vector2 to, float t)
+        {
+            m_Value.x = from.x + (to.x - from.x) * t;
+            m_Value.y = from.y + (to.y - from.y) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantRangeParameter : VolumeParameter<Vector2>
+    {
+        public float min = 0;
+        public float max = 1;
+
+        public override Vector2 value
+        {
+            get { return m_Value; }
+            set
+            {
+                m_Value.x = Mathf.Max(value.x, min);
+                m_Value.y = Mathf.Min(value.y, max);
+            }
+        }
+    }
+
+    // 32-bit RGBA
+    [Serializable]
+    public sealed class ColorParameter : VolumeParameter<Color>
+    {
+        public bool hdr = false;
+        public bool showAlpha = true;
+        public bool showEyeDropper = true;
+
+        public override void Interp(Color from, Color to, float t)
+        {
+            // Lerping color values is a sensitive subject... We looked into lerping colors using
+            // HSV and LCH but they have some downsides that make them not work correctly in all
+            // situations, so we stick with RGB lerping for now, at least its behavior is
+            // predictable despite looking desaturated when `t ~= 0.5` and it's faster anyway.
+            m_Value.r = from.r + (to.r - from.r) * t;
+            m_Value.g = from.g + (to.g - from.g) * t;
+            m_Value.b = from.b + (to.b - from.b) * t;
+            m_Value.a = from.a + (to.a - from.a) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantColorParameter : VolumeParameter<Color> { }
+
+    [Serializable]
+    public sealed class Vector2Parameter : VolumeParameter<Vector2>
+    {
+        public override void Interp(Vector2 from, Vector2 to, float t)
+        {
+            m_Value.x = from.x + (to.x - from.x) * t;
+            m_Value.y = from.y + (to.y - from.y) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantVector2Parameter : VolumeParameter<Vector2> { }
+
+    [Serializable]
+    public sealed class Vector3Parameter : VolumeParameter<Vector3>
+    {
+        public override void Interp(Vector3 from, Vector3 to, float t)
+        {
+            m_Value.x = from.x + (to.x - from.x) * t;
+            m_Value.y = from.y + (to.y - from.y) * t;
+            m_Value.z = from.z + (to.z - from.z) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantVector3Parameter : VolumeParameter<Vector3> { }
+
+    [Serializable]
+    public sealed class Vector4Parameter : VolumeParameter<Vector4>
+    {
+        public override void Interp(Vector4 from, Vector4 to, float t)
+        {
+            m_Value.x = from.x + (to.x - from.x) * t;
+            m_Value.y = from.y + (to.y - from.y) * t;
+            m_Value.z = from.z + (to.z - from.z) * t;
+            m_Value.w = from.w + (to.w - from.w) * t;
+        }
+    }
+
+    [Serializable]
+    public sealed class InstantVector4Parameter : VolumeParameter<Vector4> { }
+
+    // Used as a container to store custom serialized classes/structs inside volume components
+    [Serializable]
+    public class ObjectParameter<T> : VolumeParameter<T>
+    {
+        internal ReadOnlyCollection<VolumeParameter> parameters { get; private set; }
+
+        // Force override state to true for container objects
+        public override bool overrideState
+        {
+            get { return true; }
+            set { m_OverrideState = true; }
+        }
+
+        public override T value
+        {
+            get { return m_Value; }
+            set
+            {
+                m_Value = value;
+
+                if (m_Value == null)
+                {
+                    parameters = null;
+                    return;
+                }
+
+                // Automatically grab all fields of type VolumeParameter contained in this instance
+                parameters = m_Value.GetType()
+                    .GetFields(BindingFlags.Public | BindingFlags.Instance)
+                    .Where(t => t.FieldType.IsSubclassOf(typeof(VolumeParameter)))
+                    .OrderBy(t => t.MetadataToken) // Guaranteed order
+                    .Select(t => (VolumeParameter)t.GetValue(m_Value))
+                    .ToList()
+                    .AsReadOnly();
+            }
+        }
+
+        internal override void Interp(VolumeParameter from, VolumeParameter to, float t)
+        {
+            if (m_Value == null)
+                return;
+
+            var paramOrigin = parameters;
+            var paramFrom = ((ObjectParameter<T>)from).parameters;
+            var paramTo = ((ObjectParameter<T>)to).parameters;
+
+            for (int i = 0; i < paramFrom.Count; i++)
+            {
+                if (paramOrigin[i].overrideState)
+                    paramOrigin[i].Interp(paramFrom[i], paramTo[i], t);
+            }
+        }
+    }
+}

ScriptableRenderPipeline/Core/Volume/VolumeParameter.cs.meta

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