using UnityEngine;
using UnityEngine.Rendering;

namespace BodhiDonselaar
{
	[RequireComponent(typeof(Camera))]
	public class EquiCam : MonoBehaviour
	{
		public enum Size
		{
			High = 2048,
			Default = 1024,
			Low = 512,
			Minimum = 256
		}

		private static Material equi;

		public Size RenderResolution = Size.Default;

		private RenderTexture cubemap;

		private Camera cam;

		private GameObject child;

		private void OnEnable()
		{
			if (equi == null)
			{
				equi = new Material(Resources.Load<Shader>("EquiCam"));
			}
			child = new GameObject();
			child.hideFlags = HideFlags.HideInHierarchy;
			child.transform.SetParent(base.transform);
			child.transform.localPosition = Vector3.zero;
			child.transform.localEulerAngles = Vector3.zero;
			cam = child.AddComponent<Camera>();
			cam.CopyFrom(GetComponent<Camera>());
			child.SetActive(value: false);
			New();
		}

		private void OnDisable()
		{
			if (child != null)
			{
				Object.DestroyImmediate(child);
			}
			if (cubemap != null)
			{
				cubemap.Release();
				Object.DestroyImmediate(cubemap);
			}
		}

		private void OnRenderImage(RenderTexture src, RenderTexture des)
		{
			if (cubemap.width != (int)RenderResolution)
			{
				New();
			}
			cam.RenderToCubemap(cubemap);
			Shader.SetGlobalFloat("FORWARD", cam.transform.eulerAngles.y * 0.01745f);
			Graphics.Blit(cubemap, des, equi);
		}

		private void New()
		{
			cam.targetTexture = null;
			if (cubemap != null)
			{
				cubemap.Release();
				Object.DestroyImmediate(cubemap);
			}
			cubemap = new RenderTexture((int)RenderResolution, (int)RenderResolution, 0, RenderTextureFormat.ARGB32);
			cubemap.antiAliasing = 1;
			cubemap.filterMode = FilterMode.Bilinear;
			cubemap.anisoLevel = 0;
			cubemap.dimension = TextureDimension.Cube;
			cubemap.autoGenerateMips = false;
			cubemap.useMipMap = false;
			cam.targetTexture = cubemap;
		}
	}
}