From a91f6492cd72bbcc5574c3fb491cd72b99de9753 Mon Sep 17 00:00:00 2001
From: hatayama <booqle@gmail.com>
Date: Fri, 11 Jul 2025 17:42:44 +0900
Subject: [PATCH 1/2] Support for rect mask 2d

---
 Packages/src/Shaders/UI-CompositeCanvasRenderer.shader | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Packages/src/Shaders/UI-CompositeCanvasRenderer.shader b/Packages/src/Shaders/UI-CompositeCanvasRenderer.shader
index e58e1cc..d674ff9 100644
--- a/Packages/src/Shaders/UI-CompositeCanvasRenderer.shader
+++ b/Packages/src/Shaders/UI-CompositeCanvasRenderer.shader
@@ -199,7 +199,8 @@ Shader "UI/CompositeCanvasRenderer"
                 color *= tex2D(_MaskTex, maskUv + _Time.y * _MaskSpeed).a;
                 #endif
 
-                return applyColor(color, IN.color);
+                half4 colorFactor = half4(IN.color.rgb, IN.color.a * color.a);
+                return applyColor(color, colorFactor);
             }
             ENDCG
         }

From 81338a343ddca3a235732f85f0668f21f5b59ddf Mon Sep 17 00:00:00 2001
From: hatayama <booqle@gmail.com>
Date: Fri, 18 Jul 2025 12:54:20 +0900
Subject: [PATCH 2/2] feat: add custom shader support for
 CompositeCanvasRenderer

- Add customShader setting to ProjectSettings
- Allow overriding default UI/CompositeCanvasRenderer shader
- Maintain MaterialRepository caching compatibility
---
 Packages/src/Runtime/CompositeCanvasRenderer.cs  | 16 +++++++++++++++-
 .../CompositeCanvasRendererProjectSettings.cs    | 11 +++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/Packages/src/Runtime/CompositeCanvasRenderer.cs b/Packages/src/Runtime/CompositeCanvasRenderer.cs
index 34cd5b8..4a98f8a 100644
--- a/Packages/src/Runtime/CompositeCanvasRenderer.cs
+++ b/Packages/src/Runtime/CompositeCanvasRenderer.cs
@@ -743,13 +743,27 @@ private Material CreateMaterial()
             return CreateMaterial(colorMode, srcBlendMode, dstBlendMode);
         }
 
+        /// <summary>
+        /// Get shader to use based on project settings.
+        /// </summary>
+        private static Shader GetShaderToUse()
+        {
+            var customShader = CompositeCanvasRendererProjectSettings.customShader;
+            if (customShader != null)
+            {
+                return customShader;
+            }
+            
+            return Shader.Find("UI/CompositeCanvasRenderer");
+        }
+
         /// <summary>
         /// Create a material.
         /// </summary>
         public static Material CreateMaterial(ColorMode colorMode, BlendMode srcBlendMode, BlendMode dstBlendMode)
         {
             Profiler.BeginSample("(CCR)[CompositeCanvasRenderer] CreateMaterial");
-            var mat = new Material(Shader.Find("UI/CompositeCanvasRenderer"))
+            var mat = new Material(GetShaderToUse())
             {
                 hideFlags = HideFlags.DontSave | HideFlags.NotEditable,
                 shaderKeywords = s_ColorModeKeywords[(int)colorMode]
diff --git a/Packages/src/Runtime/ProjectSettings/CompositeCanvasRendererProjectSettings.cs b/Packages/src/Runtime/ProjectSettings/CompositeCanvasRendererProjectSettings.cs
index ea0200c..43ad18c 100644
--- a/Packages/src/Runtime/ProjectSettings/CompositeCanvasRendererProjectSettings.cs
+++ b/Packages/src/Runtime/ProjectSettings/CompositeCanvasRendererProjectSettings.cs
@@ -19,6 +19,11 @@ public class CompositeCanvasRendererProjectSettings
         [SerializeField]
         private bool m_EnableCullingInEditMode = true;
 
+        [Header("CompositeCanvasRenderer Shader Override")]
+        [SerializeField]
+        [Tooltip("Alternative shader to use instead of 'UI/CompositeCanvasRenderer'.\nLeave empty to use the default shader.")]
+        private Shader m_CustomShader;
+
 #if UNITY_EDITOR
         [Header("Shader")]
         [SerializeField]
@@ -59,6 +64,12 @@ public static float sensitivity
             }
         }
 
+        public static Shader customShader
+        {
+            get => instance.m_CustomShader;
+            set => instance.m_CustomShader = value;
+        }
+
 #if UNITY_EDITOR
         /// <summary>
         /// Reset to default values.