sync

Assets/Scripts/UIImageAlphaMask.cs

@@ -1,104 +1,71 @@
 using System.Linq;
+using UnityEditor;
 using UnityEngine;
 using UnityEngine.UI;
 
 [ExecuteInEditMode]
-[RequireComponent(typeof(Image))]
 public class UIImageAlphaMask : MonoBehaviour
 {
-    private Image m_MaskImage;
+    private Canvas canvas;
-    private Canvas m_Canvas;
+    private RectTransform rectTransform;
-    private RectTransform m_RectTransform;
+    private Image maskImage;
-    private Image[] m_TargetImageList;
-    private Material m_Material;
 
-    private Material Material
+    [SerializeField, HideInInspector]
-    {
+    private Image[] targetImageList;
-        get
-        {
-            if (m_Material == null)
-            {
-                m_Material = new Material(Shader.Find("Hidden/UI/AlphaMask"));
-            }
-            return m_Material;
-        }
-    }
 
-    private Image MaskImage
+    [SerializeField]
-    {
+    public Texture2D MaskTex;
-        get
-        {
-            if (m_MaskImage == null)
-            {
-                m_MaskImage = GetComponent<Image>();
-            }
-            return m_MaskImage;
-        }
-    }
-
-    private RectTransform SelfRect
-    {
-        get
-        {
-            if (m_RectTransform == null)
-            {
-                m_RectTransform = GetComponent<RectTransform>();
-            }
-            return m_RectTransform;
-        }
-    }
 
     private Canvas RootCanvas
     {
         get
         {
-            if (m_Canvas == null)
+            if (canvas == null)
             {
                 var canvas = GetComponentInParent<Canvas>();
                 if (canvas != null)
                 {
                     if (canvas.rootCanvas != null)
                     {
-                        m_Canvas = canvas.rootCanvas;
+                        this.canvas = canvas.rootCanvas;
                     }
                     else
                     {
-                        m_Canvas = canvas;
+                        this.canvas = canvas;
                     }
                 }
             }
-            return m_Canvas;
+            return canvas;
         }
     }
 
-
+    private void Awake()
-    private void SetMaterial(Image[] imageList, Material material)
     {
-        if (imageList == null)
+        maskImage = GetComponent<Image>();
-        {
+        rectTransform = GetComponent<RectTransform>();
-            return;
-        }
 
-        for (int i = 0; i < imageList.Length; i++)
+        if (targetImageList == null || targetImageList.Length <= 0)
         {
-            var image = imageList[i];
+            targetImageList = GetComponentsInChildren<Image>(true);
-            image.material = material;
+            targetImageList = targetImageList.Where(o => o.transform != this.transform).ToArray();
         }
     }
 
     private void Update()
     {
+#if UNITY_EDITOR
         if (!IsValid())
         {
             return;
         }
 
-        if (m_TargetImageList == null || m_TargetImageList.Length <= 0)
+        if (targetImageList == null || targetImageList.Length <= 0)
         {
-            m_TargetImageList = GetComponentsInChildren<Image>(true);
+            targetImageList = GetComponentsInChildren<Image>(true);
-            m_TargetImageList = m_TargetImageList.Where(o => o.transform != this.transform).ToArray();
+            targetImageList = targetImageList.Where(o => o.transform != this.transform).ToArray();
-            SetMaterial(m_TargetImageList, Material);
+            return;
         }
+#endif
 
         SetProperties();
     }
@@ -115,8 +82,15 @@ public class UIImageAlphaMask : MonoBehaviour
             return false;
         }
 
-        if (MaskImage.sprite == null)
+        if(MaskTex == null)
         {
+#if UNITY_EDITOR
+            var path = AssetDatabase.GetAssetPath(maskImage.sprite);
+            if(!string.IsNullOrEmpty(path))
+            {
+                MaskTex = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
+            }
+#endif
             return false;
         }
 
@@ -132,9 +106,12 @@ public class UIImageAlphaMask : MonoBehaviour
         }
 
         var matrix = CalculateMatrix(camera);
-
+        for (int i = 0; i < targetImageList.Length; i++)
-        Material.SetTexture("_MaskTex", MaskImage.sprite.texture);
+        {
-        Material.SetMatrix("_MaskMatrix", matrix);
+            var imgMat = targetImageList[i].material;
+            imgMat.SetTexture("_Alpha_MaskTex", MaskTex);
+            imgMat.SetMatrix("_MaskMatrix", matrix);
+        }
     }
 
     private Camera GetCamera()
@@ -144,7 +121,7 @@ public class UIImageAlphaMask : MonoBehaviour
 
     private Matrix4x4 CalculateMatrix(Camera camera)
     {
-        var rect = CalcurateViewportRect(camera);
+        var rect = CalculateViewportRect(camera);
 
         Matrix4x4 result = Matrix4x4.identity;
 
@@ -161,11 +138,11 @@ public class UIImageAlphaMask : MonoBehaviour
         return result;
     }
 
-    private Rect CalcurateViewportRect(Camera camera)
+    private Rect CalculateViewportRect(Camera camera)
     {
         var corners = new Vector3[4];
 
-        SelfRect.GetWorldCorners(corners);
+        rectTransform.GetWorldCorners(corners);
 
         var p1 = RectTransformUtility.WorldToScreenPoint(camera, corners[1]);
         var p3 = RectTransformUtility.WorldToScreenPoint(camera, corners[3]);

Assets/Shaders/UI-AlphaMask.shader

@@ -97,12 +97,12 @@
 			}
 
 			sampler2D _MainTex;
-			sampler2D _MaskTex;
+			sampler2D _Alpha_MaskTex;
 
 			fixed4 frag(v2f IN) : SV_Target
 			{
 				half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
-				half4 mask = tex2D(_MaskTex, IN.maskUv);
+				half4 mask = tex2D(_Alpha_MaskTex, IN.maskUv);
 
 				color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
 				color.a *= mask.a;