Unity3D研究院之更换着色器后删除材质残留宏和属性（一百二十五）

//获取shader中所有的宏
public static bool GetShaderKeywords(Shader target,out string[] global, out string[] local)
{
    try
    {
        MethodInfo globalKeywords = typeof(ShaderUtil).GetMethod("GetShaderGlobalKeywords", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
        global = (string[])globalKeywords.Invoke(null, new object[] { target });
        MethodInfo localKeywords = typeof(ShaderUtil).GetMethod("GetShaderLocalKeywords", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
        local = (string[])localKeywords.Invoke(null, new object[] { target });
        return true;
    }
    catch 
    {
        global = local = null;
        return false;
    }
}

[MenuItem("工具/重置着色器")]
static void Test222()
{
    //这里替换成自己的材质，也可以深度遍历整个工程中的材质
    Material m = AssetDatabase.LoadAssetAtPath<Material>("Assets/aa223.mat");
    if (GetShaderKeywords(m.shader,out var global, out var local))
    {
        HashSet<string> keywords = new HashSet<string>();
        foreach (var g in global)
        {
            keywords.Add(g);
        }
        foreach (var l in local)
        {
            keywords.Add(l);
        }
        //重置keywords
        List<string> resetKeywords = new List<string>(m.shaderKeywords);
        foreach (var item in m.shaderKeywords)
        {
            if (!keywords.Contains(item))
                resetKeywords.Remove(item);
        }
        m.shaderKeywords = resetKeywords.ToArray();
    }
    HashSet<string> property = new HashSet<string>();
    int count = m.shader.GetPropertyCount();
    for (int i = 0; i < count; i++)
    {
        property.Add(m.shader.GetPropertyName(i));
    }

    SerializedObject o = new SerializedObject(m);
    SerializedProperty disabledShaderPasses = o.FindProperty("disabledShaderPasses");
    SerializedProperty SavedProperties = o.FindProperty("m_SavedProperties");
    SerializedProperty TexEnvs = SavedProperties.FindPropertyRelative("m_TexEnvs");
    SerializedProperty Floats = SavedProperties.FindPropertyRelative("m_Floats");
    SerializedProperty Colors = SavedProperties.FindPropertyRelative("m_Colors");
    //对比属性删除残留的属性
    for (int i = disabledShaderPasses.arraySize - 1; i >= 0; i--)
    {
        if (!property.Contains(disabledShaderPasses.GetArrayElementAtIndex(i).displayName))
        {
            disabledShaderPasses.DeleteArrayElementAtIndex(i);
        }
    }
    for (int i = TexEnvs.arraySize - 1; i >=0; i--)
    {
        if (!property.Contains(TexEnvs.GetArrayElementAtIndex(i).displayName))
        {
            TexEnvs.DeleteArrayElementAtIndex(i);
        }
    }
    for (int i = Floats.arraySize - 1; i >= 0; i--)
    {
        if (!property.Contains(Floats.GetArrayElementAtIndex(i).displayName))
        {
            Floats.DeleteArrayElementAtIndex(i);
        }
    }
    for (int i = Colors.arraySize - 1; i >= 0; i--)
    {
        if (!property.Contains(Colors.GetArrayElementAtIndex(i).displayName))
        {
            Colors.DeleteArrayElementAtIndex(i);
        }
    }
    o.ApplyModifiedProperties();

    Debug.Log("Done!");
}