using System.IO;
using UnityEngine;
using UnityEngine.UI;

namespace Runtime
{
    public class TestHunHePic : MonoBehaviour
    {
        public Texture2D bottomTexture;
        public Texture2D topTexture;
        public Shader blendShader;

        [ContextMenu("Blend and Export")]
        public void BlendAndExport()
        {
            // 创建临时RenderTexture
            RenderTexture rt = new RenderTexture(bottomTexture.width, bottomTexture.height, 0);
        
            // 创建材质并设置纹理
            Material blendMaterial = new Material(blendShader);
            blendMaterial.SetTexture("_MainTex", bottomTexture);
            blendMaterial.SetTexture("_BlendTex", topTexture);

            // 执行混合
            Graphics.Blit(null, rt, blendMaterial);

            // 转换RenderTexture为Texture2D
            Texture2D output = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, false);
            RenderTexture.active = rt;
            output.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
            output.Apply();

            // 保存为PNG
            byte[] bytes = output.EncodeToPNG();
            string path = Path.Combine(Application.streamingAssetsPath, "BlendedImage.png");
            File.WriteAllBytes(path, bytes);

            // 清理资源
            RenderTexture.active = null;
            DestroyImmediate(rt);
            Destroy(output);

            Debug.Log($"Saved blended image to: {path}");
        }
    }
}