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Unity3D研究院之材质Shader通用面板（一百二十一）

 3 years ago
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Unity3D研究院之材质Shader通用面板（一百二十一）

技美在调shader的时候可能不太擅长C#编辑面板的代码，所以有了这篇文章。我封装了一个通用的着色器GUI面板，这样就可以不需要写C#代码了，实现的过程中试图解决了这几个问题。

1.视图解决分组面板展开与缩进

2.if标签与原生标签的混合

我看了下编辑器下C#的代码自定义MaterialPropertyDrawer虽然也可以实现分组，但是无法与原生标签嵌套混合，所以改变了一下思路，在面板中如果有if标签，并且Foldout没有展开不进行绘制。

直接上代码

using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.Text.RegularExpressions;
using UnityEngine.Rendering;
using System;
//自定义效果-单行显示图片
internal class SingleLineDrawer : MaterialPropertyDrawer
    public override void OnGUI(Rect position, MaterialProperty prop, GUIContent label, MaterialEditor editor)
        editor.TexturePropertySingleLine(label, prop);
    public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
        return 0;
//自定义效果-折行显示图片
internal class FoldoutDrawer : MaterialPropertyDrawer
    bool showPosition;
    public override void OnGUI(Rect position, MaterialProperty prop, string label, MaterialEditor editor)
        showPosition = EditorGUILayout.Foldout(showPosition, label);
        prop.floatValue = Convert.ToSingle(showPosition);
    public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
        return 0;
public class CustomShaderGUI : ShaderGUI
    public class MaterialData
        public MaterialProperty prop;
        public bool indentLevel = false;
    static Dictionary<string, MaterialProperty> s_MaterialProperty = new Dictionary<string, MaterialProperty>();
    static List<MaterialData> s_List = new List<MaterialData>();
    public override void OnGUI(MaterialEditor materialEditor, MaterialProperty[] properties)
        Shader shader = (materialEditor.target as Material).shader;
        s_List.Clear();
        s_MaterialProperty.Clear();
        for (int i = 0; i < properties.Length; i++)
            var propertie = properties[i];
            s_MaterialProperty[propertie.name] = propertie;
            s_List.Add(new MaterialData() { prop = propertie, indentLevel = false });
            var attributes = shader.GetPropertyAttributes(i);
            foreach (var item in attributes)
                if (item.StartsWith("if"))
                    Match match = Regex.Match(item, @"(\w+)\s*\((.*)\)");
                    if (match.Success)
                        var name = match.Groups[2].Value.Trim();
                        if (s_MaterialProperty.TryGetValue(name, out var a))
                            if (a.floatValue == 0f) {
                                //如果有if标签，并且Foldout没有展开不进行绘制
                                s_List.RemoveAt(s_List.Count - 1);
                                break;
                                s_List[s_List.Count - 1].indentLevel = true;
        /*如果不需要展开子节点像右缩进，可以直接调用base方法
         base.OnGUI(materialEditor, s_List.ToArray());*/
        PropertiesDefaultGUI(materialEditor, s_List);
    private static int s_ControlHash = "EditorTextField".GetHashCode();
    public void PropertiesDefaultGUI(MaterialEditor materialEditor, List<MaterialData> props)
        var f = materialEditor.GetType().GetField("m_InfoMessage", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
        if (f != null)
            string m_InfoMessage = (string)f.GetValue(materialEditor);
            materialEditor.SetDefaultGUIWidths();
            if (m_InfoMessage != null)
                EditorGUILayout.HelpBox(m_InfoMessage, MessageType.Info);
                GUIUtility.GetControlID(s_ControlHash, FocusType.Passive, new Rect(0f, 0f, 0f, 0f));
        for (int i = 0; i < props.Count; i++)
            MaterialProperty prop = props[i].prop;
            bool indentLevel = props[i].indentLevel;
            if ((prop.flags & (MaterialProperty.PropFlags.HideInInspector | MaterialProperty.PropFlags.PerRendererData)) == MaterialProperty.PropFlags.None)
                float propertyHeight = materialEditor.GetPropertyHeight(prop, prop.displayName);
                Rect controlRect = EditorGUILayout.GetControlRect(true, propertyHeight, EditorStyles.layerMaskField);
                if(indentLevel) EditorGUI.indentLevel++;
                materialEditor.ShaderProperty(controlRect, prop, prop.displayName);
                if (indentLevel) EditorGUI.indentLevel--;
        EditorGUILayout.Space();
        EditorGUILayout.Space();
        if (SupportedRenderingFeatures.active.editableMaterialRenderQueue)
            materialEditor.RenderQueueField();
        materialEditor.EnableInstancingField();
        materialEditor.DoubleSidedGIField();

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