529 lines
20 KiB
C#
529 lines
20 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using UnityEngine.Assertions;
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namespace UnityEngine.Rendering
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{
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using UnityObject = UnityEngine.Object;
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/// <summary>
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/// A global manager that tracks all the Volumes in the currently loaded Scenes and does all the
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/// interpolation work.
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/// </summary>
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public sealed class VolumeManager
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{
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static readonly Lazy<VolumeManager> s_Instance = new Lazy<VolumeManager>(() => new VolumeManager());
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/// <summary>
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/// The current singleton instance of <see cref="VolumeManager"/>.
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/// </summary>
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public static VolumeManager instance => s_Instance.Value;
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/// <summary>
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/// A reference to the main <see cref="VolumeStack"/>.
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/// </summary>
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/// <seealso cref="VolumeStack"/>
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public VolumeStack stack { get; set; }
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/// <summary>
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/// The current list of all available types that derive from <see cref="VolumeComponent"/>.
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/// </summary>
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[Obsolete("Please use baseComponentTypeArray instead.")]
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public IEnumerable<Type> baseComponentTypes
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{
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get => baseComponentTypeArray;
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private set => baseComponentTypeArray = value.ToArray();
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}
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/// <summary>
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/// The current list of all available types that derive from <see cref="VolumeComponent"/>.
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/// </summary>
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public Type[] baseComponentTypeArray { get; private set; }
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// Max amount of layers available in Unity
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const int k_MaxLayerCount = 32;
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// Cached lists of all volumes (sorted by priority) by layer mask
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readonly Dictionary<int, List<Volume>> m_SortedVolumes;
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// Holds all the registered volumes
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readonly List<Volume> m_Volumes;
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// Keep track of sorting states for layer masks
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readonly Dictionary<int, bool> m_SortNeeded;
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// Internal list of default state for each component type - this is used to reset component
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// states on update instead of having to implement a Reset method on all components (which
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// would be error-prone)
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readonly List<VolumeComponent> m_ComponentsDefaultState;
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// Recycled list used for volume traversal
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readonly List<Collider> m_TempColliders;
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// The default stack the volume manager uses.
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// We cache this as users able to change the stack through code and
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// we want to be able to switch to the default one through the ResetMainStack() function.
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VolumeStack m_DefaultStack = null;
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VolumeManager()
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{
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m_SortedVolumes = new Dictionary<int, List<Volume>>();
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m_Volumes = new List<Volume>();
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m_SortNeeded = new Dictionary<int, bool>();
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m_TempColliders = new List<Collider>(8);
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m_ComponentsDefaultState = new List<VolumeComponent>();
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ReloadBaseTypes();
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m_DefaultStack = CreateStack();
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stack = m_DefaultStack;
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}
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/// <summary>
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/// Creates and returns a new <see cref="VolumeStack"/> to use when you need to store
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/// the result of the Volume blending pass in a separate stack.
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/// </summary>
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/// <returns></returns>
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/// <seealso cref="VolumeStack"/>
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/// <seealso cref="Update(VolumeStack,Transform,LayerMask)"/>
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public VolumeStack CreateStack()
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{
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var stack = new VolumeStack();
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stack.Reload(m_ComponentsDefaultState);
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return stack;
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}
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/// <summary>
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/// Resets the main stack to be the default one.
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/// Call this function if you've assigned the main stack to something other than the default one.
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/// </summary>
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public void ResetMainStack()
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{
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stack = m_DefaultStack;
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}
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/// <summary>
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/// Destroy a Volume Stack
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/// </summary>
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/// <param name="stack">Volume Stack that needs to be destroyed.</param>
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public void DestroyStack(VolumeStack stack)
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{
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stack.Dispose();
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}
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// This will be called only once at runtime and everytime script reload kicks-in in the
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// editor as we need to keep track of any compatible component in the project
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void ReloadBaseTypes()
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{
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m_ComponentsDefaultState.Clear();
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// Grab all the component types we can find
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baseComponentTypeArray = CoreUtils.GetAllTypesDerivedFrom<VolumeComponent>()
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.Where(t => !t.IsAbstract).ToArray();
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var flags = System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic;
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// Keep an instance of each type to be used in a virtual lowest priority global volume
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// so that we have a default state to fallback to when exiting volumes
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foreach (var type in baseComponentTypeArray)
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{
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type.GetMethod("Init", flags)?.Invoke(null, null);
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var inst = (VolumeComponent)ScriptableObject.CreateInstance(type);
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m_ComponentsDefaultState.Add(inst);
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}
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}
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/// <summary>
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/// Registers a new Volume in the manager. Unity does this automatically when a new Volume is
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/// enabled, or its layer changes, but you can use this function to force-register a Volume
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/// that is currently disabled.
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/// </summary>
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/// <param name="volume">The volume to register.</param>
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/// <param name="layer">The LayerMask that this volume is in.</param>
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/// <seealso cref="Unregister"/>
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public void Register(Volume volume, int layer)
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{
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m_Volumes.Add(volume);
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// Look for existing cached layer masks and add it there if needed
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foreach (var kvp in m_SortedVolumes)
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{
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// We add the volume to sorted lists only if the layer match and if it doesn't contain the volume already.
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if ((kvp.Key & (1 << layer)) != 0 && !kvp.Value.Contains(volume))
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kvp.Value.Add(volume);
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}
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SetLayerDirty(layer);
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}
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/// <summary>
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/// Unregisters a Volume from the manager. Unity does this automatically when a Volume is
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/// disabled or goes out of scope, but you can use this function to force-unregister a Volume
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/// that you added manually while it was disabled.
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/// </summary>
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/// <param name="volume">The Volume to unregister.</param>
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/// <param name="layer">The LayerMask that this Volume is in.</param>
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/// <seealso cref="Register"/>
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public void Unregister(Volume volume, int layer)
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{
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m_Volumes.Remove(volume);
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foreach (var kvp in m_SortedVolumes)
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{
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// Skip layer masks this volume doesn't belong to
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if ((kvp.Key & (1 << layer)) == 0)
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continue;
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kvp.Value.Remove(volume);
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}
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}
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/// <summary>
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/// Checks if a <see cref="VolumeComponent"/> is active in a given LayerMask.
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/// </summary>
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/// <typeparam name="T">A type derived from <see cref="VolumeComponent"/></typeparam>
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/// <param name="layerMask">The LayerMask to check against</param>
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/// <returns><c>true</c> if the component is active in the LayerMask, <c>false</c>
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/// otherwise.</returns>
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public bool IsComponentActiveInMask<T>(LayerMask layerMask)
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where T : VolumeComponent
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{
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int mask = layerMask.value;
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foreach (var kvp in m_SortedVolumes)
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{
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if (kvp.Key != mask)
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continue;
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foreach (var volume in kvp.Value)
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{
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if (!volume.enabled || volume.profileRef == null)
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continue;
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if (volume.profileRef.TryGet(out T component) && component.active)
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return true;
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}
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}
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return false;
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}
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internal void SetLayerDirty(int layer)
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{
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Assert.IsTrue(layer >= 0 && layer <= k_MaxLayerCount, "Invalid layer bit");
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foreach (var kvp in m_SortedVolumes)
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{
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var mask = kvp.Key;
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if ((mask & (1 << layer)) != 0)
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m_SortNeeded[mask] = true;
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}
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}
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internal void UpdateVolumeLayer(Volume volume, int prevLayer, int newLayer)
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{
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Assert.IsTrue(prevLayer >= 0 && prevLayer <= k_MaxLayerCount, "Invalid layer bit");
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Unregister(volume, prevLayer);
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Register(volume, newLayer);
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}
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// Go through all listed components and lerp overridden values in the global state
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void OverrideData(VolumeStack stack, List<VolumeComponent> components, float interpFactor)
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{
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foreach (var component in components)
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{
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if (!component.active)
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continue;
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var state = stack.GetComponent(component.GetType());
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component.Override(state, interpFactor);
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}
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}
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// Faster version of OverrideData to force replace values in the global state
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void ReplaceData(VolumeStack stack)
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{
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var resetParameters = stack.defaultParameters;
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var resetParametersCount = resetParameters.Length;
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for (int i = 0; i < resetParametersCount; i++)
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{
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var resetParam = resetParameters[i];
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var targetParam = resetParam.parameter;
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targetParam.overrideState = false;
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targetParam.SetValue(resetParam.defaultValue);
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}
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}
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/// <summary>
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/// Checks the state of the base type library. This is only used in the editor to handle
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/// entering and exiting of play mode and domain reload.
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/// </summary>
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[Conditional("UNITY_EDITOR")]
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public void CheckBaseTypes()
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{
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// Editor specific hack to work around serialization doing funky things when exiting
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if (m_ComponentsDefaultState == null || (m_ComponentsDefaultState.Count > 0 && m_ComponentsDefaultState[0] == null))
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ReloadBaseTypes();
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}
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/// <summary>
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/// Checks the state of a given stack. This is only used in the editor to handle entering
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/// and exiting of play mode and domain reload.
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/// </summary>
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/// <param name="stack">The stack to check.</param>
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[Conditional("UNITY_EDITOR")]
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public void CheckStack(VolumeStack stack)
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{
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// The editor doesn't reload the domain when exiting play mode but still kills every
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// object created while in play mode, like stacks' component states
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var components = stack.components;
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if (components == null)
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{
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stack.Reload(m_ComponentsDefaultState);
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return;
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}
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foreach (var kvp in components)
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{
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if (kvp.Key == null || kvp.Value == null)
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{
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stack.Reload(m_ComponentsDefaultState);
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return;
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}
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}
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}
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// Returns true if must execute Update() in full, and false if we can early exit.
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bool CheckUpdateRequired(VolumeStack stack)
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{
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if (m_Volumes.Count == 0)
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{
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if (stack.requiresReset)
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{
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// Update the stack one more time in case there was a volume that just ceased to exist. This ensures
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// the stack will return to default values correctly.
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stack.requiresReset = false;
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return true;
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}
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// There were no volumes last frame either, and stack has been returned to defaults, so no update is
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// needed and we can early exit from Update().
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return false;
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}
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stack.requiresReset = true; // Stack must be reset every frame whenever there are volumes present
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return true;
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}
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/// <summary>
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/// Updates the global state of the Volume manager. Unity usually calls this once per Camera
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/// in the Update loop before rendering happens.
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/// </summary>
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/// <param name="trigger">A reference Transform to consider for positional Volume blending
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/// </param>
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/// <param name="layerMask">The LayerMask that the Volume manager uses to filter Volumes that it should consider
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/// for blending.</param>
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public void Update(Transform trigger, LayerMask layerMask)
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{
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Update(stack, trigger, layerMask);
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}
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/// <summary>
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/// Updates the Volume manager and stores the result in a custom <see cref="VolumeStack"/>.
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/// </summary>
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/// <param name="stack">The stack to store the blending result into.</param>
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/// <param name="trigger">A reference Transform to consider for positional Volume blending.
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/// </param>
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/// <param name="layerMask">The LayerMask that Unity uses to filter Volumes that it should consider
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/// for blending.</param>
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/// <seealso cref="VolumeStack"/>
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public void Update(VolumeStack stack, Transform trigger, LayerMask layerMask)
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{
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Assert.IsNotNull(stack);
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CheckBaseTypes();
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CheckStack(stack);
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if (!CheckUpdateRequired(stack))
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return;
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// Start by resetting the global state to default values
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ReplaceData(stack);
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bool onlyGlobal = trigger == null;
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var triggerPos = onlyGlobal ? Vector3.zero : trigger.position;
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// Sort the cached volume list(s) for the given layer mask if needed and return it
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var volumes = GrabVolumes(layerMask);
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Camera camera = null;
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// Behavior should be fine even if camera is null
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if (!onlyGlobal)
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trigger.TryGetComponent<Camera>(out camera);
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// Traverse all volumes
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foreach (var volume in volumes)
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{
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if (volume == null)
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continue;
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#if UNITY_EDITOR
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// Skip volumes that aren't in the scene currently displayed in the scene view
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if (!IsVolumeRenderedByCamera(volume, camera))
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continue;
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#endif
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// Skip disabled volumes and volumes without any data or weight
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if (!volume.enabled || volume.profileRef == null || volume.weight <= 0f)
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continue;
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// Global volumes always have influence
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if (volume.isGlobal)
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{
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OverrideData(stack, volume.profileRef.components, Mathf.Clamp01(volume.weight));
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continue;
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}
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if (onlyGlobal)
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||
|
|
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(stack, volume.profileRef.components, interpFactor * Mathf.Clamp01(volume.weight));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Get all volumes on a given layer mask sorted by influence.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="layerMask">The LayerMask that Unity uses to filter Volumes that it should consider.</param>
|
||
|
|
/// <returns>An array of volume.</returns>
|
||
|
|
public Volume[] GetVolumes(LayerMask layerMask)
|
||
|
|
{
|
||
|
|
var volumes = GrabVolumes(layerMask);
|
||
|
|
volumes.RemoveAll(v => v == null);
|
||
|
|
return volumes.ToArray();
|
||
|
|
}
|
||
|
|
|
||
|
|
List<Volume> GrabVolumes(LayerMask mask)
|
||
|
|
{
|
||
|
|
List<Volume> list;
|
||
|
|
|
||
|
|
if (!m_SortedVolumes.TryGetValue(mask, out list))
|
||
|
|
{
|
||
|
|
// New layer mask detected, create a new list and cache all the volumes that belong
|
||
|
|
// to this mask in it
|
||
|
|
list = new List<Volume>();
|
||
|
|
|
||
|
|
foreach (var volume in m_Volumes)
|
||
|
|
{
|
||
|
|
if ((mask & (1 << volume.gameObject.layer)) == 0)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
list.Add(volume);
|
||
|
|
m_SortNeeded[mask] = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
m_SortedVolumes.Add(mask, list);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check sorting state
|
||
|
|
bool sortNeeded;
|
||
|
|
if (m_SortNeeded.TryGetValue(mask, out sortNeeded) && sortNeeded)
|
||
|
|
{
|
||
|
|
m_SortNeeded[mask] = false;
|
||
|
|
SortByPriority(list);
|
||
|
|
}
|
||
|
|
|
||
|
|
return list;
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool IsVolumeRenderedByCamera(Volume volume, Camera camera)
|
||
|
|
{
|
||
|
|
#if UNITY_2018_3_OR_NEWER && UNITY_EDITOR
|
||
|
|
// IsGameObjectRenderedByCamera does not behave correctly when camera is null so we have to catch it here.
|
||
|
|
return camera == null ? true : UnityEditor.SceneManagement.StageUtility.IsGameObjectRenderedByCamera(volume.gameObject, camera);
|
||
|
|
#else
|
||
|
|
return true;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// A scope in which a Camera filters a Volume.
|
||
|
|
/// </summary>
|
||
|
|
[Obsolete("VolumeIsolationScope is deprecated, it does not have any effect anymore.")]
|
||
|
|
public struct VolumeIsolationScope : IDisposable
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// Constructs a scope in which a Camera filters a Volume.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="unused">Unused parameter.</param>
|
||
|
|
public VolumeIsolationScope(bool unused) { }
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Stops the Camera from filtering a Volume.
|
||
|
|
/// </summary>
|
||
|
|
void IDisposable.Dispose() { }
|
||
|
|
}
|
||
|
|
}
|