232 lines
8.7 KiB
C#
232 lines
8.7 KiB
C#
using UnityEditor;
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using UnityEngine;
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// UIMask 材质面板的"下拉框 -> 隐藏属性"绘制器基类。
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// ShaderLab 的 Blend / Cull 只接受数字属性，没法用枚举直接切换，
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// 所以由绘制器把下拉框的选项写进隐藏属性。
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// 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
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// _SrcBlend / _DstBlend / _Cull）切过来的材质会被自动纠正。
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// 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。
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public abstract class UIMaskEnumDrawer : MaterialPropertyDrawer
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{
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protected abstract string[] Options { get; }
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// 把下拉框当前选项同步到材质上的隐藏属性
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protected abstract void Apply(MaterialEditor editor, int index);
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public override void OnGUI(Rect position, MaterialProperty prop, string label, MaterialEditor editor)
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{
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EditorGUI.BeginChangeCheck();
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int index = Mathf.Clamp(Mathf.RoundToInt(prop.floatValue), 0, Options.Length - 1);
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index = EditorGUI.Popup(position, label, index, Options);
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if (EditorGUI.EndChangeCheck())
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{
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prop.floatValue = index;
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}
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Apply(editor, index);
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}
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public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
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{
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return EditorGUIUtility.singleLineHeight;
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}
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protected void SetValue(MaterialEditor editor, string propertyName, float value)
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{
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foreach (Object target in editor.targets)
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{
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var material = target as Material;
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if (material == null || !material.HasProperty(propertyName))
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{
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continue;
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}
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if (!Mathf.Approximately(material.GetFloat(propertyName), value))
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{
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material.SetFloat(propertyName, value);
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}
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}
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}
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}
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// 混合模式：Additive / Alpha / Alpha Premultiplied / Opaque
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// 数值对应 UnityEngine.Rendering.BlendMode：SrcAlpha=5, One=1, OneMinusSrcAlpha=10, Zero=0
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// Opaque 会同时打开 ZWrite（不透明需要写深度），其余模式 ZWrite = 0
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public class UIMaskBlendMode : UIMaskEnumDrawer
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{
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private static readonly string[] Items = { "Additive", "Alpha", "Alpha Premultiplied", "Opaque" };
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protected override string[] Options => Items;
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protected override void Apply(MaterialEditor editor, int index)
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{
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const float srcAlpha = (float)UnityEngine.Rendering.BlendMode.SrcAlpha; // 5
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const float one = (float)UnityEngine.Rendering.BlendMode.One; // 1
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const float oneMinusSrcAlpha = (float)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha; // 10
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const float zero = (float)UnityEngine.Rendering.BlendMode.Zero; // 0
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switch (index)
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{
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case 1: // Alpha：标准透明混合
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SetValue(editor, "_SrcBlend", srcAlpha);
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SetValue(editor, "_DstBlend", oneMinusSrcAlpha);
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SetValue(editor, "_ZWrite", 0f);
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break;
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case 2: // Alpha Premultiplied：颜色已预乘 alpha，源因子用 One
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SetValue(editor, "_SrcBlend", one);
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SetValue(editor, "_DstBlend", oneMinusSrcAlpha);
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SetValue(editor, "_ZWrite", 0f);
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break;
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case 3: // Opaque：不混合 + 写深度
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SetValue(editor, "_SrcBlend", one);
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SetValue(editor, "_DstBlend", zero);
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SetValue(editor, "_ZWrite", 1f);
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break;
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default: // Additive：SrcAlpha + One
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SetValue(editor, "_SrcBlend", srcAlpha);
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SetValue(editor, "_DstBlend", one);
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SetValue(editor, "_ZWrite", 0f);
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break;
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}
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}
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}
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// 渲染面：只渲染前面 / 只渲染后面 / 双面
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// 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）
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public class UIMaskRenderFace : UIMaskEnumDrawer
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{
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private const float CullOff = 0f;
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private const float CullFront = 1f;
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private const float CullBack = 2f;
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private static readonly string[] Items = { "前面", "背面", "双面" };
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protected override string[] Options => Items;
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protected override void Apply(MaterialEditor editor, int index)
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{
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float cull = index == 0 ? CullBack : (index == 1 ? CullFront : CullOff);
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SetValue(editor, "_Cull", cull);
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}
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}
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// 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）
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// 默认 A（index = 3）
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public class UIMaskChannel : UIMaskEnumDrawer
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{
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private static readonly string[] Items = { "R 通道", "G 通道", "B 通道", "A 通道" };
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protected override string[] Options => Items;
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protected override void Apply(MaterialEditor editor, int index)
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{
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// 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
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}
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}
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// 通用模块：粒子自定义数据通道下拉框（shader 里写 [CustomDataChannel]）
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// 选项 9 项：null / Custom1.xyzw / Custom2.xyzw；值 0=null，1~4=Custom1，5~8=Custom2
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// 右侧会提示该通道是否已被同一材质上的其它参数占用
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//（约定：属性名里含 "CustomChannel" 的都会被统计，以后新增参数只要按这个命名即可自动纳入）
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// shader 侧配套函数：CustomDataChannelValue(custom1, custom2, channel) → 取对应通道的值
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public class CustomDataChannel : MaterialPropertyDrawer
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{
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private static readonly string[] Items =
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{
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"null",
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"Custom1.x", "Custom1.y", "Custom1.z", "Custom1.w",
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"Custom2.x", "Custom2.y", "Custom2.z", "Custom2.w"
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};
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private const float HintWidth = 150f;
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public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
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{
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return EditorGUIUtility.singleLineHeight;
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}
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public override void OnGUI(Rect position, MaterialProperty prop, string label, MaterialEditor editor)
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{
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Rect popupRect = new Rect(position.x, position.y, Mathf.Max(60f, position.width - HintWidth - 4f), position.height);
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Rect hintRect = new Rect(position.xMax - HintWidth, position.y, HintWidth, position.height);
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int index = Mathf.Clamp(Mathf.RoundToInt(prop.floatValue), 0, Items.Length - 1);
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EditorGUI.BeginChangeCheck();
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EditorGUI.showMixedValue = prop.hasMixedValue;
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index = EditorGUI.Popup(popupRect, label, index, Items);
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EditorGUI.showMixedValue = false;
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if (EditorGUI.EndChangeCheck())
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{
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prop.floatValue = index;
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}
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bool occupied;
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string hint = DescribeOccupation(editor, prop, index, out occupied);
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var hintContent = new GUIContent(hint, "数据来自粒子系统的「自定义数据」模块；"
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+ "还需要在粒子渲染器的「自定义顶点流」里按 UV、Custom1.xyzw、Custom2.xyzw 的顺序勾选对应通道。");
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Color oldColor = GUI.color;
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if (index == 0)
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{
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GUI.color = new Color(0.7f, 0.7f, 0.7f);
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}
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else
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{
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GUI.color = occupied ? new Color(1f, 0.72f, 0.25f) : new Color(0.55f, 0.85f, 0.55f);
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}
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EditorGUI.LabelField(hintRect, hintContent, EditorStyles.miniLabel);
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GUI.color = oldColor;
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}
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private static string DescribeOccupation(MaterialEditor editor, MaterialProperty prop, int index, out bool occupied)
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{
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occupied = false;
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if (index == 0)
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{
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return "未使用";
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}
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var material = editor.targets.Length > 0 ? editor.targets[0] as Material : null;
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if (material == null)
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{
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return string.Empty;
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}
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Shader shader = material.shader;
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int count = ShaderUtil.GetPropertyCount(shader);
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var owners = new System.Collections.Generic.List<string>();
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for (int i = 0; i < count; i++)
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{
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string name = ShaderUtil.GetPropertyName(shader, i);
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if (name == prop.name || !name.Contains("CustomChannel"))
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{
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continue;
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}
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if (!material.HasProperty(name) || Mathf.RoundToInt(material.GetFloat(name)) != index)
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{
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continue;
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}
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string description = ShaderUtil.GetPropertyDescription(shader, i);
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owners.Add(string.IsNullOrEmpty(description) ? name : description);
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}
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if (owners.Count == 0)
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{
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return "未占用";
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}
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occupied = true;
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return owners.Count == 1
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? "已被 " + owners[0] + " 占用"
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: "已被 " + owners[0] + " 等 " + owners.Count + " 处占用";
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}
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}
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