using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace FidelityFX
{
    [RequireComponent(typeof(Camera), typeof(Fsr2ImageEffect))]
    public class Fsr2ImageEffectHelper : MonoBehaviour
    {
        private Camera _renderCamera;
        private Fsr2ImageEffect _imageEffect;

        private void OnEnable()
        {
            _renderCamera = GetComponent<Camera>();
            _imageEffect = GetComponent<Fsr2ImageEffect>();
        }

        private void OnPreCull()
        {
            if (_imageEffect == null || !_imageEffect.enabled)
                return;
            
            var originalRect = _renderCamera.rect;
            float upscaleRatio = Fsr2.GetUpscaleRatioFromQualityMode(_imageEffect.qualityMode);

            // Render to a smaller portion of the screen by manipulating the camera's viewport rect
            _renderCamera.aspect = (_renderCamera.pixelWidth * originalRect.width) / (_renderCamera.pixelHeight * originalRect.height);
            _renderCamera.rect = new Rect(0, 0, originalRect.width / upscaleRatio, originalRect.height / upscaleRatio);
        }
    }
}