备份CatanBuilding瘦身独立工程

LocalPackages/SoftMaskForUGUI/Scripts/SoftMask.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Profiling;
+using UnityEngine.Rendering;
+using UnityEngine.Serialization;
+using UnityEngine.UI;
+using Object = UnityEngine.Object;
+
+namespace Coffee.UISoftMask
+{
+    /// <summary>
+    /// Soft mask.
+    /// Use instead of Mask for smooth masking.
+    /// </summary>
+    public class SoftMask : Mask, IMeshModifier
+    {
+        /// <summary>
+        /// Down sampling rate.
+        /// </summary>
+        public enum DownSamplingRate
+        {
+            None = 0,
+            x1 = 1,
+            x2 = 2,
+            x4 = 4,
+            x8 = 8,
+        }
+
+        private static readonly List<SoftMask>[] s_TmpSoftMasks = new List<SoftMask>[]
+        {
+            new List<SoftMask>(),
+            new List<SoftMask>(),
+            new List<SoftMask>(),
+            new List<SoftMask>(),
+        };
+
+        private static readonly Color[] s_ClearColors = new Color[]
+        {
+            new Color(0, 0, 0, 0),
+            new Color(1, 0, 0, 0),
+            new Color(1, 1, 0, 0),
+            new Color(1, 1, 1, 0),
+        };
+
+        private static bool s_UVStartsAtTop;
+        private static bool s_IsMetal;
+        private static Shader s_SoftMaskShader;
+        private static Texture2D s_ReadTexture;
+        private static readonly List<SoftMask> s_ActiveSoftMasks = new List<SoftMask>();
+        private static readonly List<SoftMask> s_TempRelatables = new List<SoftMask>();
+        private static readonly Dictionary<int, Matrix4x4> s_PreviousViewProjectionMatrices = new Dictionary<int, Matrix4x4>();
+        private static readonly Dictionary<int, Matrix4x4> s_NowViewProjectionMatrices = new Dictionary<int, Matrix4x4>();
+        private static int s_StencilCompId;
+        private static int s_ColorMaskId;
+        private static int s_MainTexId;
+        private static int s_SoftnessId;
+        private static int s_Alpha;
+        private static int s_PreviousWidth;
+        private static int s_PreviousHeight;
+        private MaterialPropertyBlock _mpb;
+        private CommandBuffer _cb;
+        private Material _material;
+        private RenderTexture _softMaskBuffer;
+        private int _stencilDepth;
+        private Mesh _mesh;
+        private SoftMask _parent;
+        internal readonly List<SoftMask> _children = new List<SoftMask>();
+        private bool _hasChanged = false;
+        private bool _hasStencilStateChanged = false;
+
+
+        [FormerlySerializedAs("m_DesamplingRate")] [SerializeField, Tooltip("The down sampling rate for soft mask buffer.")]
+        private DownSamplingRate m_DownSamplingRate = DownSamplingRate.x1;
+
+        [SerializeField, Range(0, 1), Tooltip("The value used by the soft mask to select the area of influence defined over the soft mask's graphic.")]
+        private float m_Softness = 1;
+
+        [SerializeField, Range(0f, 1f), Tooltip("The transparency of the whole masked graphic.")]
+        private float m_Alpha = 1;
+
+        [Header("Advanced Options")] [SerializeField, Tooltip("Should the soft mask ignore parent soft masks?")]
+        private bool m_IgnoreParent = false;
+
+        [SerializeField, Tooltip("Is the soft mask a part of parent soft mask?")]
+        private bool m_PartOfParent = false;
+
+        [SerializeField, Tooltip("Self graphic will not be drawn to soft mask buffer.")]
+        private bool m_IgnoreSelfGraphic;
+
+
+        [SerializeField, Tooltip("Self graphic will not be written to stencil buffer.")]
+        private bool m_IgnoreSelfStencil;
+
+        /// <summary>
+        /// The down sampling rate for soft mask buffer.
+        /// </summary>
+        public DownSamplingRate downSamplingRate
+        {
+            get { return m_DownSamplingRate; }
+            set
+            {
+                if (m_DownSamplingRate == value) return;
+                m_DownSamplingRate = value;
+                hasChanged = true;
+            }
+        }
+
+        /// <summary>
+        /// The value used by the soft mask to select the area of influence defined over the soft mask's graphic.
+        /// </summary>
+        public float softness
+        {
+            get { return m_Softness; }
+            set
+            {
+                value = Mathf.Clamp01(value);
+                if (Mathf.Approximately(m_Softness, value)) return;
+                m_Softness = value;
+                hasChanged = true;
+            }
+        }
+
+        /// <summary>
+        /// The transparency of the whole masked graphic.
+        /// </summary>
+        public float alpha
+        {
+            get { return m_Alpha; }
+            set
+            {
+                value = Mathf.Clamp01(value);
+                if (Mathf.Approximately(m_Alpha, value)) return;
+                m_Alpha = value;
+                hasChanged = true;
+            }
+        }
+
+        /// <summary>
+        /// Should the soft mask ignore parent soft masks?
+        /// </summary>
+        /// <value>If set to true the soft mask will ignore any parent soft mask settings.</value>
+        public bool ignoreParent
+        {
+            get { return m_IgnoreParent; }
+            set
+            {
+                if (m_IgnoreParent == value) return;
+                m_IgnoreParent = value;
+                hasChanged = true;
+                OnTransformParentChanged();
+            }
+        }
+
+        /// <summary>
+        /// Is the soft mask a part of parent soft mask?
+        /// </summary>
+        public bool partOfParent
+        {
+            get { return m_PartOfParent; }
+            set
+            {
+                if (m_PartOfParent == value) return;
+                m_PartOfParent = value;
+                hasChanged = true;
+                OnTransformParentChanged();
+            }
+        }
+
+        /// <summary>
+        /// The soft mask buffer.
+        /// </summary>
+        public RenderTexture softMaskBuffer
+        {
+            get
+            {
+                if (_parent)
+                {
+                    ReleaseRt(ref _softMaskBuffer);
+                    return _parent.softMaskBuffer;
+                }
+
+                // Check the size of soft mask buffer.
+                int w, h;
+                GetDownSamplingSize(m_DownSamplingRate, out w, out h);
+                if (_softMaskBuffer && (_softMaskBuffer.width != w || _softMaskBuffer.height != h))
+                {
+                    ReleaseRt(ref _softMaskBuffer);
+                }
+
+                if (!_softMaskBuffer)
+                {
+                    _softMaskBuffer = RenderTexture.GetTemporary(w, h, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Default, 1, RenderTextureMemoryless.Depth);
+                    hasChanged = true;
+                    _hasStencilStateChanged = true;
+                }
+
+                return _softMaskBuffer;
+            }
+        }
+
+        public bool hasChanged
+        {
+            get { return _parent ? _parent.hasChanged : _hasChanged; }
+            private set
+            {
+                if (_parent)
+                {
+                    _parent.hasChanged = value;
+                }
+
+                _hasChanged = value;
+            }
+        }
+
+        public SoftMask parent
+        {
+            get { return _parent; }
+        }
+
+        public bool ignoreSelfGraphic
+        {
+            get { return m_IgnoreSelfGraphic; }
+            set
+            {
+                if (m_IgnoreSelfGraphic == value) return;
+                m_IgnoreSelfGraphic = value;
+                hasChanged = true;
+                graphic.SetVerticesDirtyEx();
+            }
+        }
+
+        public bool ignoreSelfStencil
+        {
+            get { return m_IgnoreSelfStencil; }
+            set
+            {
+                if (m_IgnoreSelfStencil == value) return;
+                m_IgnoreSelfStencil = value;
+                hasChanged = true;
+                graphic.SetVerticesDirtyEx();
+                graphic.SetMaterialDirtyEx();
+            }
+        }
+
+
+        Material material
+        {
+            get
+            {
+                return _material
+                    ? _material
+                    : _material =
+                        new Material(s_SoftMaskShader
+                            ? s_SoftMaskShader
+                            : s_SoftMaskShader = Resources.Load<Shader>("SoftMask")) {hideFlags = HideFlags.HideAndDontSave};
+            }
+        }
+
+        Mesh mesh
+        {
+            get { return _mesh ? _mesh : _mesh = new Mesh() {hideFlags = HideFlags.HideAndDontSave}; }
+        }
+
+
+        /// <summary>
+        /// Perform material modification in this function.
+        /// </summary>
+        /// <returns>Modified material.</returns>
+        /// <param name="baseMaterial">Configured Material.</param>
+        public override Material GetModifiedMaterial(Material baseMaterial)
+        {
+            hasChanged = true;
+            if (ignoreSelfStencil) return baseMaterial;
+
+            var result = base.GetModifiedMaterial(baseMaterial);
+            if (m_IgnoreParent && result != baseMaterial)
+            {
+                result.SetInt(s_StencilCompId, (int) CompareFunction.Always);
+            }
+
+            return result;
+        }
+
+
+        /// <summary>
+        /// Call used to modify mesh.
+        /// </summary>
+        void IMeshModifier.ModifyMesh(Mesh mesh)
+        {
+            hasChanged = true;
+            _mesh = mesh;
+        }
+
+        /// <summary>
+        /// Call used to modify mesh.
+        /// </summary>
+        void IMeshModifier.ModifyMesh(VertexHelper verts)
+        {
+            if (isActiveAndEnabled)
+            {
+                if (ignoreSelfGraphic)
+                {
+                    verts.Clear();
+                    verts.FillMesh(mesh);
+                }
+                else if (ignoreSelfStencil)
+                {
+                    verts.FillMesh(mesh);
+                    verts.Clear();
+                }
+                else
+                {
+                    verts.FillMesh(mesh);
+                }
+            }
+
+            hasChanged = true;
+        }
+
+        /// <summary>
+        /// Given a point and a camera is the raycast valid.
+        /// </summary>
+        /// <returns>Valid.</returns>
+        /// <param name="sp">Screen position.</param>
+        /// <param name="eventCamera">Raycast camera.</param>
+        /// <param name="g">Target graphic.</param>
+        public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera, Graphic g, int[] interactions)
+        {
+            if (!isActiveAndEnabled || (g == graphic && !g.raycastTarget)) return true;
+
+            int x = (int) ((softMaskBuffer.width - 1) * Mathf.Clamp01(sp.x / Screen.width));
+            int y = s_UVStartsAtTop && !s_IsMetal
+                ? (int) ((softMaskBuffer.height - 1) * (1 - Mathf.Clamp01(sp.y / Screen.height)))
+                : (int) ((softMaskBuffer.height - 1) * Mathf.Clamp01(sp.y / Screen.height));
+            return 0.5f < GetPixelValue(x, y, interactions);
+        }
+
+        public override bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// This function is called when the object becomes enabled and active.
+        /// </summary>
+        protected override void OnEnable()
+        {
+            hasChanged = true;
+
+            // Register.
+            if (s_ActiveSoftMasks.Count == 0)
+            {
+                Canvas.willRenderCanvases += UpdateMaskTextures;
+
+                if (s_StencilCompId == 0)
+                {
+                    s_UVStartsAtTop = SystemInfo.graphicsUVStartsAtTop;
+                    s_IsMetal = SystemInfo.graphicsDeviceType == GraphicsDeviceType.Metal;
+                    s_StencilCompId = Shader.PropertyToID("_StencilComp");
+                    s_ColorMaskId = Shader.PropertyToID("_ColorMask");
+                    s_MainTexId = Shader.PropertyToID("_MainTex");
+                    s_SoftnessId = Shader.PropertyToID("_Softness");
+                    s_Alpha = Shader.PropertyToID("_Alpha");
+                }
+            }
+
+            s_ActiveSoftMasks.Add(this);
+
+            // Reset the parent-child relation.
+            GetComponentsInChildren<SoftMask>(false, s_TempRelatables);
+            for (int i = s_TempRelatables.Count - 1; 0 <= i; i--)
+            {
+                s_TempRelatables[i].OnTransformParentChanged();
+            }
+
+            s_TempRelatables.Clear();
+
+            // Create objects.
+            _mpb = new MaterialPropertyBlock();
+            _cb = new CommandBuffer();
+
+            graphic.SetVerticesDirtyEx();
+
+            base.OnEnable();
+            _hasStencilStateChanged = false;
+        }
+
+        /// <summary>
+        /// This function is called when the behaviour becomes disabled.
+        /// </summary>
+        protected override void OnDisable()
+        {
+            // Unregister.
+            s_ActiveSoftMasks.Remove(this);
+            if (s_ActiveSoftMasks.Count == 0)
+            {
+                Canvas.willRenderCanvases -= UpdateMaskTextures;
+            }
+
+            // Reset the parent-child relation.
+            for (int i = _children.Count - 1; 0 <= i; i--)
+            {
+                _children[i].SetParent(_parent);
+            }
+
+            _children.Clear();
+            SetParent(null);
+
+            // Destroy objects.
+            _mpb.Clear();
+            _mpb = null;
+            _cb.Release();
+            _cb = null;
+
+            ReleaseObject(_mesh);
+            _mesh = null;
+            ReleaseObject(_material);
+            _material = null;
+            ReleaseRt(ref _softMaskBuffer);
+
+            base.OnDisable();
+            _hasStencilStateChanged = false;
+        }
+
+        /// <summary>
+        /// This function is called when the parent property of the transform of the GameObject has changed.
+        /// </summary>
+        protected override void OnTransformParentChanged()
+        {
+            hasChanged = true;
+            SoftMask newParent = null;
+            if (isActiveAndEnabled && !m_IgnoreParent)
+            {
+                var parentTransform = transform.parent;
+                while (parentTransform && (!newParent || !newParent.enabled))
+                {
+                    newParent = parentTransform.GetComponent<SoftMask>();
+                    parentTransform = parentTransform.parent;
+                }
+            }
+
+            SetParent(newParent);
+            hasChanged = true;
+        }
+
+        protected override void OnRectTransformDimensionsChange()
+        {
+            hasChanged = true;
+        }
+
+#if UNITY_EDITOR
+        /// <summary>
+        /// This function is called when the script is loaded or a value is changed in the inspector (Called in the editor only).
+        /// </summary>
+        protected override void OnValidate()
+        {
+            graphic.SetVerticesDirtyEx();
+            graphic.SetMaterialDirtyEx();
+            OnTransformParentChanged();
+            base.OnValidate();
+            _hasStencilStateChanged = false;
+        }
+#endif
+
+        /// <summary>
+        /// Update all soft mask textures.
+        /// </summary>
+        private static void UpdateMaskTextures()
+        {
+            Profiler.BeginSample("UpdateMaskTextures");
+            foreach (var sm in s_ActiveSoftMasks)
+            {
+                if (!sm || sm._hasChanged)
+                    continue;
+
+                var canvas = sm.graphic.canvas;
+                if (!canvas)
+                    continue;
+
+                if (canvas.renderMode == RenderMode.WorldSpace)
+                {
+                    var cam = canvas.worldCamera;
+                    if (!cam)
+                        continue;
+
+                    Profiler.BeginSample("Check view projection matrix changed (world space)");
+                    var nowVP = cam.projectionMatrix * cam.worldToCameraMatrix;
+                    var previousVP = default(Matrix4x4);
+                    var id = cam.GetInstanceID();
+                    s_PreviousViewProjectionMatrices.TryGetValue(id, out previousVP);
+                    s_NowViewProjectionMatrices[id] = nowVP;
+
+                    if (previousVP != nowVP)
+                    {
+                        sm.hasChanged = true;
+                    }
+
+                    Profiler.EndSample();
+                }
+
+                var rt = sm.rectTransform;
+                if (rt.hasChanged)
+                {
+                    rt.hasChanged = false;
+                    sm.hasChanged = true;
+                }
+#if UNITY_EDITOR
+                if (!Application.isPlaying)
+                {
+                    sm.hasChanged = true;
+                }
+#endif
+            }
+
+            Profiler.BeginSample("Update changed soft masks");
+            foreach (var sm in s_ActiveSoftMasks)
+            {
+                if (!sm || !sm._hasChanged)
+                    continue;
+
+                sm._hasChanged = false;
+                if (sm._parent) continue;
+                sm.UpdateMaskTexture();
+
+                if (!sm._hasStencilStateChanged) continue;
+                sm._hasStencilStateChanged = false;
+
+                Profiler.BeginSample("Notify stencil state changed");
+                MaskUtilities.NotifyStencilStateChanged(sm);
+                Profiler.EndSample();
+            }
+
+            Profiler.EndSample();
+
+            Profiler.BeginSample("Update previous view projection matrices");
+            s_PreviousViewProjectionMatrices.Clear();
+            foreach (var kv in s_NowViewProjectionMatrices)
+            {
+                s_PreviousViewProjectionMatrices.Add(kv.Key, kv.Value);
+            }
+
+            s_NowViewProjectionMatrices.Clear();
+            Profiler.EndSample();
+
+            Profiler.EndSample();
+
+#if UNITY_EDITOR
+            var w = s_PreviousWidth;
+            var h = s_PreviousHeight;
+            GetDownSamplingSize(DownSamplingRate.None, out s_PreviousWidth, out  s_PreviousHeight);
+            if (w != s_PreviousWidth || h != s_PreviousHeight)
+            {
+                Canvas.ForceUpdateCanvases();
+            }
+#endif
+        }
+
+        /// <summary>
+        /// Update the mask texture.
+        /// </summary>
+        private void UpdateMaskTexture()
+        {
+            if (!graphic || !graphic.canvas) return;
+            Profiler.BeginSample("UpdateMaskTexture");
+
+
+            _stencilDepth = MaskUtilities.GetStencilDepth(transform, MaskUtilities.FindRootSortOverrideCanvas(transform));
+
+            // Collect children soft masks.
+            Profiler.BeginSample("Collect children soft masks");
+            var depth = 0;
+            s_TmpSoftMasks[0].Add(this);
+            while (_stencilDepth + depth < 3)
+            {
+                var count = s_TmpSoftMasks[depth].Count;
+                for (var i = 0; i < count; i++)
+                {
+                    var children = s_TmpSoftMasks[depth][i]._children;
+                    var childCount = children.Count;
+                    for (var j = 0; j < childCount; j++)
+                    {
+                        var child = children[j];
+                        var childDepth = child.m_PartOfParent ? depth : depth + 1;
+                        s_TmpSoftMasks[childDepth].Add(child);
+                    }
+                }
+
+                depth++;
+            }
+
+            Profiler.EndSample();
+
+            // CommandBuffer.
+            Profiler.BeginSample("Initialize CommandBuffer");
+            _cb.Clear();
+            _cb.SetRenderTarget(softMaskBuffer);
+            _cb.ClearRenderTarget(false, true, s_ClearColors[_stencilDepth]);
+            Profiler.EndSample();
+
+            // Set view and projection matrices.
+            Profiler.BeginSample("Set view and projection matrices");
+            var c = graphic.canvas.rootCanvas;
+            var cam = c.worldCamera ?? Camera.main;
+            if (c && c.renderMode != RenderMode.ScreenSpaceOverlay && cam)
+            {
+                var p = GL.GetGPUProjectionMatrix(cam.projectionMatrix, false);
+                _cb.SetViewProjectionMatrices(cam.worldToCameraMatrix, p);
+            }
+            else
+            {
+                var pos = c.transform.position;
+                var vm = Matrix4x4.TRS(new Vector3(-pos.x, -pos.y, -1000), Quaternion.identity, new Vector3(1, 1, -1f));
+                var pm = Matrix4x4.TRS(new Vector3(0, 0, -1), Quaternion.identity, new Vector3(1 / pos.x, 1 / pos.y, -2 / 10000f));
+                _cb.SetViewProjectionMatrices(vm, pm);
+            }
+
+            Profiler.EndSample();
+
+            // Draw soft masks.
+            Profiler.BeginSample("Draw Mesh");
+            for (var i = 0; i < s_TmpSoftMasks.Length; i++)
+            {
+                var count = s_TmpSoftMasks[i].Count;
+                for (var j = 0; j < count; j++)
+                {
+                    var sm = s_TmpSoftMasks[i][j];
+
+                    if (i != 0)
+                    {
+                        sm._stencilDepth = MaskUtilities.GetStencilDepth(sm.transform, MaskUtilities.FindRootSortOverrideCanvas(sm.transform));
+                    }
+
+                    // Set material property.
+                    sm.material.SetInt(s_ColorMaskId, (int) 1 << (3 - _stencilDepth - i));
+                    sm._mpb.SetTexture(s_MainTexId, sm.graphic.mainTexture);
+                    sm._mpb.SetFloat(s_SoftnessId, sm.m_Softness);
+                    sm._mpb.SetFloat(s_Alpha, sm.m_Alpha);
+
+                    // Draw mesh.
+                    _cb.DrawMesh(sm.mesh, sm.transform.localToWorldMatrix, sm.material, 0, 0, sm._mpb);
+                }
+
+                s_TmpSoftMasks[i].Clear();
+            }
+
+            Profiler.EndSample();
+
+            Graphics.ExecuteCommandBuffer(_cb);
+            Profiler.EndSample();
+        }
+
+        /// <summary>
+        /// Gets the size of the down sampling.
+        /// </summary>
+        private static void GetDownSamplingSize(DownSamplingRate rate, out int w, out int h)
+        {
+#if UNITY_EDITOR
+            if (!Application.isPlaying)
+            {
+                var res = UnityEditor.UnityStats.screenRes.Split('x');
+                w = Mathf.Max(64, int.Parse(res[0]));
+                h = Mathf.Max(64, int.Parse(res[1]));
+            }
+            else
+#endif
+            if (Screen.fullScreenMode == FullScreenMode.Windowed)
+            {
+                w = Screen.width;
+                h = Screen.height;
+            }
+            else
+            {
+                w = Screen.currentResolution.width;
+                h = Screen.currentResolution.height;
+            }
+
+            if (rate == DownSamplingRate.None)
+                return;
+
+            var aspect = (float) w / h;
+            if (w < h)
+            {
+                h = Mathf.ClosestPowerOfTwo(h / (int) rate);
+                w = Mathf.CeilToInt(h * aspect);
+            }
+            else
+            {
+                w = Mathf.ClosestPowerOfTwo(w / (int) rate);
+                h = Mathf.CeilToInt(w / aspect);
+            }
+        }
+
+        /// <summary>
+        /// Release the specified obj.
+        /// </summary>
+        /// <param name="tmpRT">Object.</param>
+        private static void ReleaseRt(ref RenderTexture tmpRT)
+        {
+            if (!tmpRT) return;
+
+            tmpRT.Release();
+            RenderTexture.ReleaseTemporary(tmpRT);
+            tmpRT = null;
+        }
+
+        /// <summary>
+        /// Release the specified obj.
+        /// </summary>
+        /// <param name="obj">Object.</param>
+        private static void ReleaseObject(Object obj)
+        {
+            if (!obj) return;
+
+#if UNITY_EDITOR
+            if (!Application.isPlaying)
+                DestroyImmediate(obj);
+            else
+#endif
+                Destroy(obj);
+        }
+
+
+        /// <summary>
+        /// Set the parent of the soft mask.
+        /// </summary>
+        /// <param name="newParent">The parent soft mask to use.</param>
+        private void SetParent(SoftMask newParent)
+        {
+            if (_parent != newParent && this != newParent)
+            {
+                if (_parent && _parent._children.Contains(this))
+                {
+                    _parent._children.Remove(this);
+                    _parent._children.RemoveAll(x => x == null);
+                }
+
+                _parent = newParent;
+            }
+
+            if (_parent && !_parent._children.Contains(this))
+            {
+                _parent._children.Add(this);
+            }
+        }
+
+        /// <summary>
+        /// Gets the pixel value.
+        /// </summary>
+        private float GetPixelValue(int x, int y, int[] interactions)
+        {
+            if (!s_ReadTexture)
+            {
+                s_ReadTexture = new Texture2D(1, 1, TextureFormat.ARGB32, false);
+            }
+
+            var currentRt = RenderTexture.active;
+
+            RenderTexture.active = softMaskBuffer;
+            s_ReadTexture.ReadPixels(new Rect(x, y, 1, 1), 0, 0);
+            s_ReadTexture.Apply(false, false);
+            RenderTexture.active = currentRt;
+
+            var colors = s_ReadTexture.GetRawTextureData();
+
+            for (int i = 0; i < 4; i++)
+            {
+                switch (interactions[(i + 3) % 4])
+                {
+                    case 0:
+                        colors[i] = 255;
+                        break;
+                    case 2:
+                        colors[i] = (byte) (255 - colors[i]);
+                        break;
+                }
+            }
+
+            switch (_stencilDepth)
+            {
+                case 0: return (colors[1] / 255f);
+                case 1: return (colors[1] / 255f) * (colors[2] / 255f);
+                case 2: return (colors[1] / 255f) * (colors[2] / 255f) * (colors[3] / 255f);
+                case 3: return (colors[1] / 255f) * (colors[2] / 255f) * (colors[3] / 255f) * (colors[0] / 255f);
+                default: return 0;
+            }
+        }
+    }
+}