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

namespace LuxWater
{
	[ExecuteInEditMode]
	[RequireComponent(typeof(Camera))]
	public class LuxWater_CameraDepthMode : MonoBehaviour
	{
		public bool GrabDepthTexture;

		private Camera cam;

		private Material CopyDepthMat;

		private RenderTextureFormat format;

		private Dictionary<Camera, CommandBuffer> m_cmdBuffer = new Dictionary<Camera, CommandBuffer>();

		private bool CamCallBackAdded;

		[HideInInspector]
		public bool ShowShaderWarning = true;

		private void OnEnable()
		{
			cam = GetComponent<Camera>();
			cam.depthTextureMode |= DepthTextureMode.Depth;
			if (SystemInfo.graphicsDeviceType == GraphicsDeviceType.Metal)
			{
				Camera.onPreCull = (Camera.CameraCallback)Delegate.Combine(Camera.onPreCull, new Camera.CameraCallback(OnPrecull));
				CamCallBackAdded = true;
				CopyDepthMat = new Material(Shader.Find("Hidden/Lux Water/CopyDepth"));
				format = RenderTextureFormat.RFloat;
				if (!SystemInfo.SupportsRenderTextureFormat(format))
				{
					format = RenderTextureFormat.RHalf;
				}
				if (!SystemInfo.SupportsRenderTextureFormat(format))
				{
					format = RenderTextureFormat.ARGBHalf;
				}
			}
		}

		private void OnDisable()
		{
			if (CamCallBackAdded)
			{
				Camera.onPreCull = (Camera.CameraCallback)Delegate.Remove(Camera.onPreCull, new Camera.CameraCallback(OnPrecull));
				foreach (KeyValuePair<Camera, CommandBuffer> item in m_cmdBuffer)
				{
					if (item.Key != null)
					{
						item.Key.RemoveCommandBuffer(CameraEvent.AfterLighting, item.Value);
					}
				}
				m_cmdBuffer.Clear();
			}
			ShowShaderWarning = true;
		}

		private void OnPrecull(Camera camera)
		{
			if (!GrabDepthTexture)
			{
				return;
			}
			if (cam.actualRenderingPath == RenderingPath.DeferredShading && SystemInfo.graphicsDeviceType == GraphicsDeviceType.Metal)
			{
				if (!m_cmdBuffer.TryGetValue(camera, out var value))
				{
					value = new CommandBuffer();
					value.name = "Lux Water Grab Depth";
					camera.AddCommandBuffer(CameraEvent.BeforeSkybox, value);
					m_cmdBuffer[camera] = value;
				}
				value.Clear();
				int pixelWidth = camera.pixelWidth;
				int pixelHeight = camera.pixelHeight;
				int num = Shader.PropertyToID("_Lux_GrabbedDepth");
				value.GetTemporaryRT(num, pixelWidth, pixelHeight, 0, FilterMode.Point, format, RenderTextureReadWrite.Linear);
				value.Blit(BuiltinRenderTextureType.CurrentActive, num, CopyDepthMat, 0);
				value.ReleaseTemporaryRT(num);
				return;
			}
			GrabDepthTexture = false;
			foreach (KeyValuePair<Camera, CommandBuffer> item in m_cmdBuffer)
			{
				if (item.Key != null)
				{
					item.Key.RemoveCommandBuffer(CameraEvent.AfterLighting, item.Value);
				}
			}
			m_cmdBuffer.Clear();
			ShowShaderWarning = true;
		}
	}
}