RenderCamUpscaler.cs

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using UnityEngine;
using UnityEngine.UI;
 
public class RenderCamUpscaler : MonoBehaviour, IChangeResolution
{
    public static RenderCamUpscaler Instance;
 
    public RenderTexture renderTex;
 
    public RawImage image;
 
    public bool active;
 
    private void Awake()
    {
        Instance = this;
    }
 
    public void SetEnable(bool enable)
    {
        bool flag2 = (image.enabled = enable);
        active = flag2;
        if (active)
        {
            OnChangeResolution();
            return;
        }
        if ((bool)renderTex)
        {
            renderTex.Release();
        }
        Camera.main.targetTexture = null;
    }
 
    public void OnChangeResolution()
    {
        if (active)
        {
            int num = Screen.width / 2;
            int num2 = Screen.height / 2;
            if (!renderTex || num != renderTex.width || num2 != renderTex.height)
            {
                CreateTex(num, num2);
            }
            image.Rect().sizeDelta = new Vector2(num * 2, num2 * 2);
        }
    }
 
    public void CreateTex(int w, int h)
    {
        if ((bool)renderTex)
        {
            renderTex.Release();
        }
        renderTex = new RenderTexture(w, h, 32);
        image.texture = renderTex;
        renderTex.filterMode = FilterMode.Point;
        Camera.main.targetTexture = renderTex;
    }
}