材质修改

Assets/Shaders/Editor/UIMaskDrawers.cs

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+using UnityEditor;
+using UnityEngine;
+
+// UIMask 材质面板的"下拉框 -> 隐藏属性"绘制器基类。
+// ShaderLab 的 Blend / Cull 只接受数字属性，没法用枚举直接切换，
+// 所以由绘制器把下拉框的选项写进隐藏属性。
+// 每次绘制面板都会同步一次，所以从其它 shader（例如 URP/Lit 也有同名的
+// _SrcBlend / _DstBlend / _Cull）切过来的材质会被自动纠正。
+// 注意：attribute 的名字必须是子类的简单类名，Unity 按类名查找绘制器。
+public abstract class UIMaskEnumDrawer : MaterialPropertyDrawer
+{
+    protected abstract string[] Options { get; }
+
+    // 把下拉框当前选项同步到材质上的隐藏属性
+    protected abstract void Apply(MaterialEditor editor, int index);
+
+    public override void OnGUI(Rect position, MaterialProperty prop, string label, MaterialEditor editor)
+    {
+        EditorGUI.BeginChangeCheck();
+        int index = Mathf.Clamp(Mathf.RoundToInt(prop.floatValue), 0, Options.Length - 1);
+        index = EditorGUI.Popup(position, label, index, Options);
+        if (EditorGUI.EndChangeCheck())
+        {
+            prop.floatValue = index;
+        }
+
+        Apply(editor, index);
+    }
+
+    public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
+    {
+        return EditorGUIUtility.singleLineHeight;
+    }
+
+    protected void SetValue(MaterialEditor editor, string propertyName, float value)
+    {
+        foreach (Object target in editor.targets)
+        {
+            var material = target as Material;
+            if (material == null || !material.HasProperty(propertyName))
+            {
+                continue;
+            }
+
+            if (!Mathf.Approximately(material.GetFloat(propertyName), value))
+            {
+                material.SetFloat(propertyName, value);
+            }
+        }
+    }
+}
+
+// 混合模式：加色 / 普通混合
+// 数值对应 UnityEngine.Rendering.BlendMode：SrcAlpha=5, One=1, OneMinusSrcAlpha=10
+public class UIMaskBlendMode : UIMaskEnumDrawer
+{
+    private static readonly string[] Items = { "Additive", "AlphaBlend" };
+
+    protected override string[] Options => Items;
+
+    protected override void Apply(MaterialEditor editor, int index)
+    {
+        SetValue(editor, "_SrcBlend", (float)UnityEngine.Rendering.BlendMode.SrcAlpha);
+        SetValue(editor, "_DstBlend", index == 0
+            ? (float)UnityEngine.Rendering.BlendMode.One
+            : (float)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
+    }
+}
+
+// 渲染面：只渲染前面 / 只渲染后面 / 双面
+// ShaderLab 的 Cull 取值：Off=0（双面）、Front=1（剔除正面，即只渲染后面）、Back=2（剔除背面，即只渲染前面）
+public class UIMaskRenderFace : UIMaskEnumDrawer
+{
+    private const float CullOff = 0f;
+    private const float CullFront = 1f;
+    private const float CullBack = 2f;
+
+    private static readonly string[] Items = { "前面", "背面", "双面" };
+
+    protected override string[] Options => Items;
+
+    protected override void Apply(MaterialEditor editor, int index)
+    {
+        float cull = index == 0 ? CullBack : (index == 1 ? CullFront : CullOff);
+        SetValue(editor, "_Cull", cull);
+    }
+}
+
+// 贴图通道：R / G / B / A（值直接被 shader 采样时使用，不需要写隐藏属性）
+// 默认 A（index = 3）
+public class UIMaskChannel : UIMaskEnumDrawer
+{
+    private static readonly string[] Items = { "R 通道", "G 通道", "B 通道", "A 通道" };
+
+    protected override string[] Options => Items;
+
+    protected override void Apply(MaterialEditor editor, int index)
+    {
+        // 下拉框的值本身就是要采样的通道号，无需同步到别的属性
+    }
+}

Assets/Shaders/Editor/UIMaskDrawers.cs.meta

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

Assets/Shaders/Editor/UIMaskShaderGUI.cs

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+using UnityEditor;
+using UnityEngine;
+
+// UIMask 的材质面板：分组折叠 + 中文标签。
+// shader 里用 CustomEditor "UIMaskShaderGUI" 挂上这个类。
+// 折叠状态存在 EditorPrefs（按组名），重编译/重启 Unity 后仍然保持。
+// 未在 Groups 里列出的属性（_SrcBlend/_DstBlend/_Cull、硬边溶解、Stencil 等）不绘制。
+public class UIMaskShaderGUI : ShaderGUI
+{
+    private const string FoldKeyPrefix = "UIMask.GUI.";
+
+    private class Group
+    {
+        public string Label;
+        public string Toggle;     // 组的启用开关（没有则为 null）
+        public string[] Props;    // 组内属性，按显示顺序
+    }
+
+    private static readonly Group[] Groups =
+    {
+        new Group
+        {
+            Label = "基础",
+            Props = new[] { "_BlendMode", "_RenderFace", "_TintColor", "_GlowScale|_AlphaScale", "_MainTex" }
+        },
+        new Group
+        {
+            Label = "UV 滚动",
+            Toggle = "_UseUvAni",
+            Props = new[] { "_SpeedU|_SpeedV" }
+        },
+        new Group
+        {
+            Label = "UV 扰乱",
+            Toggle = "_UseUvDistortion",
+            Props = new[] { "_UVNoiseTex", "_Distortion", "_NoiseScroll" }
+        },
+        new Group
+        {
+            Label = "遮罩 Mask",
+            Toggle = "_UseMask",
+            Props = new[] { "_UseMaskUvAni", "_Mask", "_MaskChannel", "_MaskSpeedU|_MaskSpeedV" }
+        },
+        new Group
+        {
+            Label = "溶解",
+            Toggle = "_UseDissolve",
+            Props = new[] { "_DissolveTex", "_DissolveChannel", "_Dissolve", "_DissolveWidth" }
+        },
+        new Group
+        {
+            Label = "UI 裁切",
+            Toggle = "_UseUIMaskClip",
+            Props = new[] { "_ClipRect" }
+        },
+        new Group
+        {
+            Label = "顶点遮罩",
+            Toggle = "_UseVertexMask",
+            Props = new[] { "_VertexOffset" }
+        },
+    };
+
+    public override void OnGUI(MaterialEditor editor, MaterialProperty[] props)
+    {
+        foreach (Group group in Groups)
+        {
+            DrawGroup(editor, props, group);
+        }
+    }
+
+    private static void DrawGroup(MaterialEditor editor, MaterialProperty[] props, Group group)
+    {
+        MaterialProperty toggle = string.IsNullOrEmpty(group.Toggle)
+            ? null
+            : FindProperty(group.Toggle, props, false);
+
+        string foldKey = FoldKeyPrefix + group.Label;
+        // 默认只展开"基础"，其余收起（收起时右边的勾选状态仍能看出该功能有没有开）
+        bool expanded = EditorPrefs.GetBool(foldKey, group.Label == "基础");
+
+        EditorGUILayout.BeginVertical(EditorStyles.helpBox);
+        EditorGUILayout.BeginHorizontal();
+        bool newExpanded = EditorGUILayout.Foldout(expanded, group.Label, true, EditorStyles.foldoutHeader);
+        if (toggle != null)
+        {
+            GUILayout.FlexibleSpace();
+            editor.ShaderProperty(toggle, GUIContent.none, 0);
+        }
+        EditorGUILayout.EndHorizontal();
+
+        if (newExpanded != expanded)
+        {
+            EditorPrefs.SetBool(foldKey, newExpanded);
+        }
+
+        if (newExpanded)
+        {
+            EditorGUI.indentLevel++;
+            DrawProps(editor, props, group.Props);
+            EditorGUI.indentLevel--;
+        }
+
+        EditorGUILayout.EndVertical();
+    }
+
+    // group.Props 里一项 = 一行；写 "A|B" 表示这两个单值属性并排在同一行
+    private static void DrawProps(MaterialEditor editor, MaterialProperty[] props, string[] rows)
+    {
+        foreach (string row in rows)
+        {
+            int separator = row.IndexOf('|');
+            if (separator < 0)
+            {
+                DrawOne(editor, props, row);
+                continue;
+            }
+
+            MaterialProperty left = FindProperty(row.Substring(0, separator), props, false);
+            MaterialProperty right = FindProperty(row.Substring(separator + 1), props, false);
+            if (left != null && right != null && IsSingleValue(left) && IsSingleValue(right))
+            {
+                DrawTwoPerRow(editor, left, right);
+            }
+            else
+            {
+                // 其中一边不存在或不是单值属性，退回各自一行，避免出错
+                if (left != null) DrawOne(editor, props, left.name);
+                if (right != null) DrawOne(editor, props, right.name);
+            }
+        }
+    }
+
+    private static void DrawOne(MaterialEditor editor, MaterialProperty[] props, string name)
+    {
+        MaterialProperty prop = FindProperty(name, props, false);
+        if (prop == null)
+        {
+            return;
+        }
+
+        if (prop.type == MaterialProperty.PropType.Texture)
+        {
+            // Unity 原生贴图选择器（缩略图 + 平铺/偏移都由它画）
+            bool scaleOffset = (prop.flags & MaterialProperty.PropFlags.NoScaleOffset) == 0;
+            editor.TextureProperty(prop, prop.displayName, scaleOffset);
+            return;
+        }
+
+        if (prop.type == MaterialProperty.PropType.Vector)
+        {
+            DrawVectorTwoLines(prop);
+            return;
+        }
+
+        editor.ShaderProperty(prop, prop.displayName);
+    }
+
+    private static bool IsSingleValue(MaterialProperty prop)
+    {
+        return prop.type == MaterialProperty.PropType.Float
+            || prop.type == MaterialProperty.PropType.Int;
+    }
+
+    // 两个单值属性并排一行；半行放不下默认标签宽度，所以临时收窄标签
+    private static void DrawTwoPerRow(MaterialEditor editor, MaterialProperty left, MaterialProperty right)
+    {
+        Rect row = EditorGUILayout.GetControlRect(true, EditorGUIUtility.singleLineHeight);
+        const float gap = 6f;
+        float half = (row.width - gap) * 0.5f;
+
+        float oldLabelWidth = EditorGUIUtility.labelWidth;
+        EditorGUIUtility.labelWidth = Mathf.Min(oldLabelWidth, half * 0.5f);
+
+        editor.ShaderProperty(new Rect(row.x, row.y, half, row.height), left, new GUIContent(left.displayName));
+        editor.ShaderProperty(new Rect(row.x + half + gap, row.y, half, row.height), right, new GUIContent(right.displayName));
+
+        EditorGUIUtility.labelWidth = oldLabelWidth;
+    }
+
+    // 四分量向量：属性名独占一行，X/Y/Z/W 单独占下一行（默认是挤在同一行，名字会被切掉）
+    private static void DrawVectorTwoLines(MaterialProperty prop)
+    {
+        EditorGUILayout.LabelField(prop.displayName, EditorStyles.label);
+
+        EditorGUI.BeginChangeCheck();
+        EditorGUI.showMixedValue = prop.hasMixedValue;
+        Vector4 value = EditorGUILayout.Vector4Field(GUIContent.none, prop.vectorValue);
+        EditorGUI.showMixedValue = false;
+        if (EditorGUI.EndChangeCheck())
+        {
+            prop.vectorValue = value;
+        }
+    }
+}

Assets/Shaders/Editor/UIMaskShaderGUI.cs.meta

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