Unity 打包图集_图集打包算法

Unity打包图集

public class MyTexturePak
{
    private const string intPutPath = "/Emoji/Input/";
    private const string outPutPath = "Assets/Emoji/Output/";
    private static readonly Vector2[] atlasSize = new Vector2[]{
        new Vector2(32,32),
        new Vector2(64,64),
        new Vector2(128,128),
        new Vector2(256,256),
        new Vector2(512,512),
        new Vector2(1024,1024),
        new Vector2(2048,2048)
    };
    private const int imageSize = 128;


    [MenuItem("MyTool/Texture Pak")]
    private static void TexturePake()
    {
        Dictionary<string, int> loadTexDic = new Dictionary<string, int>();
        string[] filesStrArr = Directory.GetFiles(Application.dataPath + intPutPath, "*.png");

        for (int i = 0; i < filesStrArr.Length; i++)
        {
            string[] tmpStr = filesStrArr[i].Split('/');
            string fileName = tmpStr[tmpStr.Length - 1].Split('_')[0];
            if (loadTexDic.ContainsKey(fileName))
            {
                loadTexDic[fileName]++;
            }
            else
            {
                loadTexDic.Add(fileName, 1);
            }
        }

        if (!Directory.Exists(outPutPath))
        {
            Directory.CreateDirectory(outPutPath);
        }

        int allF = 0;
        foreach (var key in loadTexDic.Keys)
        {
            allF += loadTexDic[key];
        }

        Vector2 bigImageSize = GetSize(allF);
        Texture2D bigImage2D = new Texture2D((int)bigImageSize.x, (int)bigImageSize.y, TextureFormat.ARGB32, false);

        int x = 0;
        int y = 0;
        int ImageIndex = 0;
        Dictionary<string, EmojiInfo> TexPakInfoDic = new Dictionary<string, EmojiInfo>();

        foreach (var key in loadTexDic.Keys)
        {
            for (int i = 0; i < loadTexDic[key]; i++)
            {
                string path = "Assets" + intPutPath + key;
                if (loadTexDic[key]==1)
                {
                    path += ".png";
                }
                else
                {
                    path += $"_{i + 1}.png";
                }

                Debug.Log(path);

                Texture2D loadSmallImage = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
                Color[] colors = loadSmallImage.GetPixels(0);

                for (int j = 0; j < imageSize; j++)
                {
                    for (int k = 0; k < imageSize; k++)
                    {
                        bigImage2D.SetPixel(x + j, y + k, colors[j + k * imageSize]);
                    }
                }


                if (!TexPakInfoDic.ContainsKey(key))
                {
                    EmojiInfo info;
                    info.key = $"[{ImageIndex++}]";
                    info.x = (x / bigImageSize.x).ToString();
                    info.y = (y / bigImageSize.y).ToString();
                    info.size = (imageSize / bigImageSize.x).ToString();
                    TexPakInfoDic.Add(key, info);
                }

                x += imageSize;
                if (x>= bigImageSize.x)
                {
                    x = 0;
                    y += imageSize;
                }
            }
        }


        byte[] buffer = bigImage2D.EncodeToPNG();
        File.WriteAllBytes(outPutPath + "MyBigTexture.png", buffer);

        using (StreamWriter sw = new StreamWriter(outPutPath + "MyBigTextureInfo.txt"))
        {
            sw.WriteLine("Name\tKey\tFrames\tX\tY\tSize");
            foreach (var key in TexPakInfoDic.Keys)
            {
                sw.WriteLine("{" + key + "}\t" + TexPakInfoDic[key].key + "\t" + loadTexDic[key] + "\t" + TexPakInfoDic[key].x + "\t" + TexPakInfoDic[key].y + "\t" + TexPakInfoDic[key].size);
            }
        }

        AssetDatabase.Refresh();

        TextureImporter emojiTex = AssetImporter.GetAtPath(outPutPath + "MyBigTexture.png") as TextureImporter;
        emojiTex.filterMode = FilterMode.Point;
        emojiTex.mipmapEnabled = false;
        emojiTex.sRGBTexture = true;
        emojiTex.alphaSource = TextureImporterAlphaSource.FromInput;
        emojiTex.textureCompression = TextureImporterCompression.Uncompressed;
        emojiTex.SaveAndReimport();

        EditorUtility.DisplayDialog("图包打包完成", "成功!", "OK");
    }

    private static Vector2 GetSize(int allF)
    {
        long num = imageSize * imageSize * allF;
        for (int i = 0; i < atlasSize.Length; i++)
        {
            if (num<=atlasSize[i].x * atlasSize[i].y)
            {
                return atlasSize[i];
            }
        }
        return Vector2.zero;
    }

    private struct EmojiInfo
    {
        public string key;
        public string x;
        public string y;
        public string size;
    }
}
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