private static void PackTextures(Texture2D[] textures, string path, ref List <MadAtlas.Item> items)
{
int padding = 2;
var atlasTexture = new Texture2D(1, 1, TextureFormat.ARGB32, false);
var rects = MadTexturePacker.PackTextures(atlasTexture, textures, 256, 256, padding, 4096);
//var rects = atlasTexture.PackTextures(textures, padding, 4096);
if (atlasTexture.format != TextureFormat.ARGB32)
{
// need to rewrite texture to a new one
var newAtlasTexture = new Texture2D(atlasTexture.width, atlasTexture.height, TextureFormat.ARGB32, false);
newAtlasTexture.SetPixels32(atlasTexture.GetPixels32());
newAtlasTexture.Apply();
DestroyImmediate(atlasTexture);
atlasTexture = newAtlasTexture;
}
var bytes = atlasTexture.EncodeToPNG();
DestroyImmediate(atlasTexture);
File.WriteAllBytes(path, bytes);
AssetDatabase.Refresh();
for (int i = 0; i < textures.Length; ++i)
{
var texture = textures[i];
var region = rects[i];
string guid = AssetDatabase.AssetPathToGUID(AssetDatabase.GetAssetPath(texture));
var item = (from el in items where el.textureGUID == guid select el).FirstOrDefault();
if (item != null)
{
item.region = region;
}
else
{
item = CreateItem(texture, region);
items.Add(item);
}
}
// set texture max size to 4086
var importer = TextureImporter.GetAtPath(path) as TextureImporter;
importer.maxTextureSize = 4086;
importer.isReadable = true;
AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);
}
public static Rect[] PackTextures (Texture2D texture, Texture2D[] textures, int width, int height, int padding, int maxSize)
{
if (width > maxSize && height > maxSize) return null;
if (width > maxSize || height > maxSize) { int temp = width; width = height; height = temp; }
MadTexturePacker bp = new MadTexturePacker(width, height, false);
Storage[] storage = new Storage[textures.Length];
for (int i = 0; i < textures.Length; i++)
{
Texture2D tex = textures[i];
if (!tex) continue;
Rect rect = new Rect();
int xPadding = 1;
int yPadding = 1;
for (xPadding = 1; xPadding >= 0; --xPadding)
{
for (yPadding = 1; yPadding >= 0; --yPadding)
{
rect = bp.Insert(tex.width + (xPadding * padding), tex.height + (yPadding * padding),
MadTexturePacker.FreeRectChoiceHeuristic.RectBestAreaFit);
if (rect.width != 0 && rect.height != 0) break;
// After having no padding if it still doesn't fit -- increase texture size.
else if (xPadding == 0 && yPadding == 0)
{
return PackTextures(texture, textures, width * (width <= height ? 2 : 1),
height * (height < width ? 2 : 1), padding, maxSize);
}
}
if (rect.width != 0 && rect.height != 0) break;
}
storage[i] = new Storage();
storage[i].rect = rect;
storage[i].paddingX = (xPadding != 0);
storage[i].paddingY = (yPadding != 0);
}
texture.Resize(width, height);
texture.SetPixels(new Color[width * height]);
// The returned rects
Rect[] rects = new Rect[textures.Length];
for (int i = 0; i < textures.Length; i++)
{
Texture2D tex = textures[i];
if (!tex) continue;
Rect rect = storage[i].rect;
int xPadding = (storage[i].paddingX ? padding : 0);
int yPadding = (storage[i].paddingY ? padding : 0);
Color[] colors = tex.GetPixels();
// Would be used to rotate the texture if need be.
if (rect.width != tex.width + xPadding)
{
Color[] newColors = tex.GetPixels();
for (int x = 0; x < rect.width; x++)
{
for (int y = 0; y < rect.height; y++)
{
int prevIndex = ((int)rect.height - (y + 1)) + x * (int)tex.width;
newColors[x + y * (int)rect.width] = colors[prevIndex];
}
}
colors = newColors;
}
texture.SetPixels((int)rect.x, (int)rect.y, (int)rect.width - xPadding, (int)rect.height - yPadding, colors);
rect.x /= width;
rect.y /= height;
rect.width = (rect.width - xPadding) / width;
rect.height = (rect.height - yPadding) / height;
rects[i] = rect;
}
texture.Apply();
return rects;
}