PortalRenderer.cs

using System;
using UnityEngine;
using UnityEngine.TestTools;

/// <summary>
/// Starts the recursive portal rendering process, taking into account portal occlusion volumes.
/// </summary>
public class PortalRenderer : MonoBehaviour
{
    public static PortalRenderer Instance;
    
    [SerializeField] private Camera portalCamera;
    [SerializeField] private int maxRecursions = 2;
    [SerializeField] private LayerMask noCloneMask;
    [SerializeField] private LayerMask renderCloneMask;

    /// <summary>
    /// Debug read only: Indicates the total amount of recursive renders performed by portals this frame.
    /// </summary>
    public int debugTotalRenderCount;
    /// <summary>
    /// Debug read only: Indicates how many portal renders were due to being directly visible by the player.
    /// Use this field to debug the size of portal occlusion volumes.
    /// </summary>
    public int debugDirectRenderCount;
    
    private void Awake()
    {
        Instance = this;
    }

    private void OnPreRender()
    {
        // Find the current occlusion volume

        var currentOcclusionVolume =
            PortalOcclusionVolumeManager.Instance.FindOcclusionVolumeContainingPosition(GameManager.Instance.MainCamera.transform.position);

        // Render portals in occlusion volume

        if (currentOcclusionVolume == null)
            return;

        var mainCamera = GameManager.Instance.MainCamera;
        var mainCameraTransform = mainCamera.transform;
        var cameraPlanes = GeometryUtility.CalculateFrustumPlanes(mainCamera);

        debugTotalRenderCount = 0;
        debugDirectRenderCount = 0;

        foreach (var portal in currentOcclusionVolume.Portals)
        {
            if (!portal.ShouldRender(cameraPlanes))
                continue;

            portal.RenderViewthroughRecursive(
                mainCameraTransform.position,
                mainCameraTransform.rotation,
                out _,
                out _,
                out var renderCount,
                portalCamera,
                0,
                maxRecursions,
                currentOcclusionVolume,
                noCloneMask,
                renderCloneMask,
                PortalableObjectManager.Instance.FpsPovPortalableObject
                    ? PortalableObjectManager.Instance.FpsPovPortalableObject.CurrentTouchingPortalSender
                    : null);

            debugTotalRenderCount += renderCount;
            debugDirectRenderCount++;
        }
    }

    private void OnPostRender()
    {
        PortalRenderTexturePoolManager.Instance.ReleaseAll();
    }
}