using System.Collections;
using System.IO;
using UnityEngine;

namespace TKS
{
    /// <summary>카메라를 고정 해상도 렌더 텍스처로 찍어 PNG 로 저장(실측 검증용).</summary>
    public static class CaptureUtil
    {
        public static IEnumerator Capture(Camera cam, int width, int height, string path)
        {
            var rt = new RenderTexture(width, height, 24);
            var prevTarget = cam.targetTexture;
            cam.targetTexture = rt;
            // 한 프레임 기다려 캔버스가 새 해상도로 배치되게 한 뒤 직접 렌더
            yield return null;
            cam.Render();
            var prevActive = RenderTexture.active;
            RenderTexture.active = rt;
            var tex = new Texture2D(width, height, TextureFormat.RGB24, false);
            tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
            tex.Apply();
            RenderTexture.active = prevActive;
            cam.targetTexture = prevTarget;
            Directory.CreateDirectory(Path.GetDirectoryName(path));
            File.WriteAllBytes(path, tex.EncodeToPNG());
            Object.Destroy(tex);
            rt.Release();
            Object.Destroy(rt);
        }
    }
}