UnityEditor编辑器扩展开发-自定义Shader入门

Posted 2023-01-25 avi9111

估计需要自定义Shader 的人不多

下面内容就看看

作为小白的我们，无从入手，当然首先看看 Amplify Shader Editor(ASE）是如何实现Shader定义，

从(ASE)的Shader代码，得知自定义原理（代码）

    //CustomEditor "ASEMaterialInspector"
    CustomEditor "SkinShaderGUI_URP_SRP"
    Fallback "Hidden/InternalErrorShader"
    

    public override void OnGUI( MaterialEditor materialEditor, MaterialProperty[] properties )
    
        IOUtils.Init();//IOUtils还不算特别
        Material mat = materialEditor.target as Material;
//。。。zheli这里又一堆特别代码
//。。。
        Shader shader = mat.shader;
        int propertyCount = UnityEditor.ShaderUtil.GetPropertyCount( shader );
        for( int i = 0; i < properties.Length; i++ )
        
            if( ( properties[ i ].flags & ( MaterialProperty.PropFlags.HideInInspector | MaterialProperty.PropFlags.PerRendererData ) ) == MaterialProperty.PropFlags.None )
            
                // Removed no scale offset one line texture property for consistency :( sad face
                //if( ( properties[ i ].flags & MaterialProperty.PropFlags.NoScaleOffset ) == MaterialProperty.PropFlags.NoScaleOffset )
                //
                //    object obj = MaterialPropertyHandlerEx.GetHandler( mat.shader, properties[ i ].name );
                //    if( obj != null )
                //    
                //        float height = MaterialPropertyHandlerEx.GetPropertyHeight( obj, properties[ i ], properties[ i ].displayName, materialEditor );
                //        //Rect rect = (Rect)materialEditor.GetType().InvokeMember( "GetPropertyRect", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod, null, materialEditor, new object[]  properties[ i ], properties[ i ].displayName, true  );
                //        Rect rect = EditorGUILayout.GetControlRect( true, height, EditorStyles.layerMaskField );
                //        MaterialPropertyHandlerEx.OnGUI( obj, ref rect, properties[ i ], new GUIContent( properties[ i ].displayName ), materialEditor );

                //        if( MaterialPropertyHandlerEx.PropertyDrawer( obj ) != null )
                //            continue;

                //        rect = EditorGUILayout.GetControlRect( true, height, EditorStyles.layerMaskField );
                //        materialEditor.TexturePropertyMiniThumbnail( rect, properties[ i ], properties[ i ].displayName, string.Empty );
                //    
                //    else
                //    
                //        materialEditor.TexturePropertySingleLine( new GUIContent( properties[ i ].displayName ), properties[ i ] );
                //    
                //
                //else
                //
                    float propertyHeight = materialEditor.GetPropertyHeight( properties[ i ], properties[ i ].displayName );
                    Rect controlRect = EditorGUILayout.GetControlRect( true, propertyHeight, EditorStyles.layerMaskField, new GUILayoutOption[ 0 ] );
                    materialEditor.ShaderProperty( controlRect, properties[ i ], properties[ i ].displayName );
                //
            
        
               

官方的 materialEditor 给我们准备了所有API，只要调用 materialEditor.ShaderProperty 即可

自定义Shader步骤：

（你需要又一点点Unity经验，和Editor的Window或者Inspector经验即可）

基础自定义步骤

1. 创建一个类，继承ShaderGUI

2. 重写OnGUI( MaterialEditor materialEditor, MaterialProperty[] properties )

3. 获取 Material mat = materialEditor.target as Material;

4. 获取mat.shader的属性

5. 用materialEditor.ShaderProperty显示该方法

普通属性上半部分

    void OnProptyCommonGUI(string key)
    
        var specFloat = FindProperty(key, _properties);//先不管这个错误处理了。。。
        _materialEditor.ShaderProperty(specFloat, new GUIContent(specFloat.displayName, ""));
    

这样我们就完成了属性部分

没了？？就这？？

    
        EditorGUILayout.Space();
        materialEditor.RenderQueueField();
        materialEditor.EnableInstancingField();
        materialEditor.DoubleSidedGIField();
        materialEditor.LightmapEmissionProperty();

再完成下半部分，

如果你想隐藏，则不需要了。。。

浅浅的自定义一个折叠Group

//关键在于代码新开始一个Button 样式：      Rect r_texturecolor = EditorGUILayout.BeginVertical("Button");
  _properties = properties;
  _materialEditor = materialEditor;
  //OnSpecularGUI(materialEditor,properties);
  OnSpecularFoldOutGUI();
 

 void OnSpecularFoldOutGUI()
    
        Rect r_texturecolor = EditorGUILayout.BeginVertical("Button");
        //Rect r_outline = EditorGUILayout.BeginVertical("Button");
        showSpecular = EditorGUILayout.Foldout(showSpecular, "(Specular - )", true, EditorStyles.foldout);


        if (showSpecular)
        

            OnProptyCommonGUI("_SpecularMapm");
            OnProptyCommonGUI("_Specular");
        
        
        EditorGUILayout.EndVertical();
    

    void OnProptyCommonGUI(string key)
    
        var specFloat = FindProperty(key, _properties);//先不管这个错误处理了。。。
        _materialEditor.ShaderProperty(specFloat, new GUIContent(specFloat.displayName, ""));
    

总结：

多说无益，Show me the Code