/// <summary>
///用Atlas替换掉Mesh使用的Material的小图
/// </summary>
/// <param name="meshDataList"></param>
public static void ReplaceTextureUseAtlas(List <MeshData> meshDataList)
{
List <TextureAtlas> atlasAssetList = new List <TextureAtlas>();
string[] assetFileArray = Directory.GetFiles(AtlasConfig.AssetDir, "*.asset", SearchOption.AllDirectories);
for (int i = 0; i < assetFileArray.Length; ++i)
{
TextureAtlas textureAtlasAsset = AssetDatabase.LoadAssetAtPath <TextureAtlas>(assetFileArray[i]);
if (null != textureAtlasAsset)
{
atlasAssetList.Add(textureAtlasAsset);
}
}
for (int i = 0; i < meshDataList.Count; ++i)
{
MeshData meshData = meshDataList[i];
if (null != meshData)
{
Texture2D texture = meshData.material.mainTexture as Texture2D;
for (int j = 0; j < atlasAssetList.Count; ++j)
{
TextureAtlas textureAtlas = atlasAssetList[j];
if (null != textureAtlas)
{
TextureAtlasElement element = textureAtlas.GetElement(texture);
if (null != element)
{
meshData.texData = new TexData()
{
Atlas = textureAtlas, Element = element
};
break;
}
}
}
if (null == meshData.texData)
{
Debug.LogError("Texture not combine to atlas. " + texture.name);
}
}
}
}
/// <summary>
/// 合并贴图
/// </summary>
/// <param name="textureList"></param>
/// <param name="atlasName"></param>
/// <param name="isTransparent"></param>
/// <param name="atlasWidth"></param>
/// <param name="atlasHeight"></param>
/// <returns></returns>
private static List <TextureAtlas> PackAtlas(List <Texture2D> textureList, string atlasName, bool isTransparent, int atlasWidth, int atlasHeight)
{
int atlasIndex = 0;
int textureCount = textureList.Count;
textureList.Sort((a, b) => { return(a.width * a.height - b.width * b.height); });
List <TextureAtlas> atlasList = new List <TextureAtlas>();
string fileName = atlasName + "_" + atlasIndex;
string assetPath = TextureAtlas.GetAssetPath(isTransparent, fileName);
while (File.Exists(assetPath))
{
TextureAtlas atlas = AssetDatabase.LoadAssetAtPath <TextureAtlas>(assetPath);
if (null != atlas)
{
atlas.Layout();
atlasList.Add(atlas);
}
atlasIndex++;
fileName = atlasName + "_" + atlasIndex;
assetPath = TextureAtlas.GetAssetPath(isTransparent, fileName);
}
List <Texture2D> newlyTextures = new List <Texture2D>();
//找出新增的图片
for (int i = 0; i < textureList.Count; ++i)
{
bool found = false;
for (int j = 0; j < atlasList.Count; ++j)
{
TextureAtlas atlas = atlasList[j];
if (null != atlas)
{
TextureAtlasElement element = atlas.GetElement(textureList[i]);
if (null != element)
{
found = true;
break;
}
}
}
if (!found)
{
newlyTextures.Add(textureList[i]);
}
}
//Asset中删除图片已经删除的记录
for (int i = 0; i < atlasList.Count; ++i)
{
TextureAtlas atlas = atlasList[i];
for (int j = atlas.ElementList.Count - 1; j >= 0; --j)
{
Texture2D elementTex = atlas.ElementList[j].Tex;
bool found = false;
for (int m = 0; m < textureList.Count; ++m)
{
if (elementTex == textureList[m])
{
found = true;
break;
}
}
if (!found)
{
atlas.RemoveElementAt(j);
}
}
}
//排列新增的图片
for (int i = 0; i < newlyTextures.Count; ++i)
{
Texture2D newlyTexture = newlyTextures[i];
if (null != newlyTexture)
{
bool added = false;
for (int j = 0; j < atlasList.Count; ++j)
{
if (atlasList[j].AddTexture(newlyTexture))
{
added = true;
break;
}
}
if (!added)
{
fileName = atlasName + "_" + atlasList.Count;
assetPath = TextureAtlas.GetAssetPath(isTransparent, fileName);
TextureAtlas atlas = ScriptableObject.CreateInstance <TextureAtlas>();
if (null != atlas)
{
atlas.Init(atlasWidth, atlasHeight, false, isTransparent, fileName);
atlas.AddTexture(newlyTexture);
atlasList.Add(atlas);
}
else
{
Debug.Log("Create atlas instance failed.");
}
}
}
}
for (int i = 0; i < atlasList.Count; ++i)
{
EditorUtility.DisplayProgressBar("", "Pack atlas ", (i + 1) / atlasList.Count);
atlasList[i].Pack();
}
EditorUtility.ClearProgressBar();
return(atlasList);
}
