using UnityEngine;

using System.Collections;

using System.IO;

/// <summary>

/// Save render texture.

/// 1.需要在Assets同级目录下新建一个Dump文件夹

/// 2.一般绑在摄像机下

/// 3.摄像机中添加RenderTexture，并将其设置为OutputTexture

/// </summary>

public class SaveRenderTexture : MonoBehaviour {

        public RenderTexture OutputTexture;

        [ContextMenu("Save png")]

        private void SaveTextureToFile()

        {

                if (OutputTexture != null)

                {

                        RenderTexture prev = RenderTexture.active;

                        RenderTexture.active = OutputTexture;

                        Texture2D png = new Texture2D(OutputTexture.width, OutputTexture.height, TextureFormat.ARGB32, false);

                        png.ReadPixels(new Rect(0, 0, OutputTexture.width, OutputTexture.height), 0, 0);

                        byte[] bytes =  png.EncodeToPNG();

                        string path = string.Format("Dump/raw {0}.png", Random.Range(0, 65536).ToString("X"));

                        FileStream file = File.Open(path, FileMode.Create);

                        BinaryWriter writer = new BinaryWriter(file);

                        writer.Write(bytes);

                        file.Close();

                        png = null;

                        RenderTexture.active = prev;

                }

        }

}