public static Texture2D GenerateAtlas(Texture2D[] sprites, out SpriteImportData[] spriteData, Vector2Int spriteSize, AseTextureSettings textureSettings)
{
var cols = sprites.Length;
var rows = 1;
float spriteCount = sprites.Length;
var divider = 2;
var width = cols * spriteSize.x;
var height = rows * spriteSize.y;
while (width > height)
{
cols = (int)Math.Ceiling(spriteCount / divider);
rows = (int)Math.Ceiling(spriteCount / cols);
width = cols * spriteSize.x;
height = rows * spriteSize.y;
if (cols <= 1)
{
break;
}
divider++;
}
if (height > width)
{
divider -= 2;
}
else
{
divider -= 1;
}
if (divider < 1)
{
divider = 1;
}
cols = (int)Math.Ceiling(spriteCount / divider);
rows = (int)Math.Ceiling(spriteCount / cols);
return(GenerateAtlas(sprites, out spriteData, spriteSize, textureSettings, cols, rows));
}
static Texture2D GenerateAtlas(Texture2D[] sprites, out SpriteImportData[] spriteData, Vector2Int spriteSize, AseTextureSettings textureSettings, int cols, int rows)
{
var spriteImportData = new List <SpriteImportData>();
var width = cols * spriteSize.x;
var height = rows * spriteSize.y;
var atlas = CreateTransparentTexture(width, height);
var index = 0;
for (var row = 0; row < rows; row++)
{
for (var col = 0; col < cols; col++)
{
Rect spriteRect = new Rect(col * spriteSize.x, atlas.height - ((row + 1) * spriteSize.y), spriteSize.x, spriteSize.y);
atlas.SetPixels((int)spriteRect.x, (int)spriteRect.y, (int)spriteRect.width, (int)spriteRect.height, sprites[index].GetPixels());
atlas.Apply();
var importData = new SpriteImportData {
rect = spriteRect,
pivot = textureSettings.spritePivot,
border = Vector4.zero,
name = index.ToString()
};
spriteImportData.Add(importData);
index++;
if (index >= sprites.Length)
{
break;
}
}
if (index >= sprites.Length)
{
break;
}
}
spriteData = spriteImportData.ToArray();
return(atlas);
}
