using UnityEngine;
using UnityEditor;
using System.IO;

namespace BFEditor.Resource
{	
	public class CombineTextureWindow : EditorWindow
	{
	    public CombineTextureWindow()
	    {
	        this.titleContent = new GUIContent("合并贴图");
	    }
	
	    Texture2D normalTex;
	    Texture2D metallTex;
	
	    private void OnEnable() { }
	
	    void OnGUI()
	    {
	        EditorGUILayout.BeginVertical("box");
	
	        EditorGUILayout.BeginHorizontal();
	        EditorGUILayout.LabelField("选择法线贴图");
	        normalTex = (Texture2D)EditorGUILayout.ObjectField(normalTex, typeof(Texture2D), false);
	        EditorGUILayout.EndHorizontal();
	
	        EditorGUILayout.Space();
	
	        EditorGUILayout.BeginHorizontal();
	        EditorGUILayout.LabelField("选择金属度贴图");
	        metallTex = (Texture2D)EditorGUILayout.ObjectField(metallTex, typeof(Texture2D), false);
	        EditorGUILayout.EndHorizontal();
	
	        EditorGUILayout.Space();
	
	        if (GUILayout.Button("合并"))
	        {
	            OnClickCombine();
	        }
	
	        EditorGUILayout.Space();
	
	        EditorGUILayout.EndVertical();
	    }
	
	    void OnClickCombine()
	    {
	        if (normalTex == null || metallTex == null)
	        {
	            return;
	        }
	        Color32[] normalColors = normalTex.GetPixels32();
	        Color32[] metallColors = metallTex.GetPixels32();
	        Color32[] newColor = new Color32[normalColors.Length];
	        for (int i = 0; i < normalColors.Length; i++)
	        {
	            newColor[i] = new Color32(normalColors[i].r, normalColors[i].g, metallColors[i].r, metallColors[i].g);
	        }
	        Texture2D tex = new Texture2D(normalTex.width, normalTex.height, TextureFormat.ARGB32, false);
	        tex.SetPixels32(newColor);
	        tex.Apply();
	
	        string path = Application.dataPath + "/combin.png";
	        File.WriteAllBytes(path, tex.EncodeToPNG());
	
	        AssetDatabase.SaveAssets();
	        AssetDatabase.Refresh();
	    }
	
	    public static void ShowWindow()
	    {
	        var window = GetWindow<CombineTextureWindow>();
	        window.Show();
	    }
	}
}