using UltimateWater.Internal;
using UnityEngine;
using UnityEngine.Rendering;

namespace UltimateWater
{
	public class DepthModule : IRenderModule
	{
		private CommandBuffer _Commands;

		private RenderTextureFormat _DepthFormat;

		private RenderTextureFormat _BlendedDepthFormat;

		private Material _DepthBlitCache;

		private int _WaterDepthTextureId;

		private int _WaterlessDepthId;

		private int _CameraDepthTextureId;

		private Material _DepthBlit
		{
			get
			{
				return (!(_DepthBlitCache != null)) ? (_DepthBlitCache = ShaderUtility.Instance.CreateMaterial(ShaderList.DepthCopy, HideFlags.DontSave)) : _DepthBlitCache;
			}
		}

		public void OnEnable(WaterCamera waterCamera)
		{
			if (!Application.isPlaying)
			{
				return;
			}
			RenderTextureFormat? format = Compatibility.GetFormat(RenderTextureFormat.Depth, new RenderTextureFormat[3]
			{
				RenderTextureFormat.RFloat,
				RenderTextureFormat.RHalf,
				RenderTextureFormat.R8
			});
			RenderTextureFormat? format2 = Compatibility.GetFormat(RenderTextureFormat.RFloat, new RenderTextureFormat[1] { RenderTextureFormat.RHalf });
			if (!format.HasValue || !format2.HasValue)
			{
				return;
			}
			_Commands = new CommandBuffer
			{
				name = "[UWS] DepthModule - Render Depth"
			};
			_CameraDepthTextureId = ShaderVariables.CameraDepthTexture2;
			_WaterDepthTextureId = ShaderVariables.WaterDepthTexture;
			_WaterlessDepthId = ShaderVariables.WaterlessDepthTexture;
			_DepthFormat = format.Value;
			_BlendedDepthFormat = format.Value;
			if (SystemInfo.graphicsShaderLevel >= 50)
			{
				return;
			}
			_BlendedDepthFormat = format2.Value;
			if (_BlendedDepthFormat == RenderTextureFormat.RFloat && waterCamera.BaseEffectsQuality < 0.2f)
			{
				RenderTextureFormat? format3 = Compatibility.GetFormat(RenderTextureFormat.RHalf);
				if (format3.HasValue)
				{
					_BlendedDepthFormat = format3.Value;
				}
			}
		}

		public void OnDisable(WaterCamera waterCamera)
		{
			if (Application.isPlaying)
			{
				Unbind(waterCamera);
				if (_DepthBlitCache != null)
				{
					_DepthBlitCache.Destroy();
					_DepthBlitCache = null;
				}
				if (_Commands != null)
				{
					_Commands.Release();
					_Commands = null;
				}
			}
		}

		public void OnValidate(WaterCamera waterCamera)
		{
			ShaderUtility.Instance.Use(ShaderList.WaterDepth);
		}

		public void Process(WaterCamera waterCamera)
		{
			if (Application.isPlaying && (waterCamera.RenderWaterDepth || waterCamera.RenderMode == WaterRenderMode.ImageEffectDeferred))
			{
				int baseEffectWidth = waterCamera.BaseEffectWidth;
				int baseEffectHeight = waterCamera.BaseEffectHeight;
				FilterMode filter = ((!(waterCamera.BaseEffectsQuality > 0.98f)) ? FilterMode.Bilinear : FilterMode.Point);
				Material depthBlit = _DepthBlit;
				if (_Commands == null)
				{
					_Commands = new CommandBuffer
					{
						name = "[Ultimate Water] Render Depth"
					};
				}
				_Commands.Clear();
				_Commands.GetTemporaryRT(_WaterDepthTextureId, baseEffectWidth, baseEffectHeight, (_DepthFormat != RenderTextureFormat.Depth) ? 16 : 32, filter, _DepthFormat, RenderTextureReadWrite.Linear);
				_Commands.SetRenderTarget(_WaterDepthTextureId);
				_Commands.ClearRenderTarget(true, true, Color.white);
				waterCamera.AddWaterRenderCommands(_Commands, ShaderUtility.Instance.Get(ShaderList.WaterDepth), true, true, false);
				_Commands.GetTemporaryRT(_WaterlessDepthId, baseEffectWidth, baseEffectHeight, (_BlendedDepthFormat == RenderTextureFormat.Depth) ? 32 : 0, FilterMode.Point, _BlendedDepthFormat, RenderTextureReadWrite.Linear);
				_Commands.SetRenderTarget(_WaterlessDepthId);
				_Commands.DrawMesh(Quads.BipolarXInversedY, Matrix4x4.identity, depthBlit, 0, (_BlendedDepthFormat == RenderTextureFormat.Depth) ? 3 : 0);
				_Commands.GetTemporaryRT(_CameraDepthTextureId, baseEffectWidth, baseEffectHeight, (_BlendedDepthFormat == RenderTextureFormat.Depth) ? 32 : 0, FilterMode.Point, _BlendedDepthFormat, RenderTextureReadWrite.Linear);
				_Commands.SetRenderTarget(_CameraDepthTextureId);
				_Commands.ClearRenderTarget(true, true, Color.white);
				_Commands.DrawMesh(Quads.BipolarXInversedY, Matrix4x4.identity, depthBlit, 0, (_BlendedDepthFormat != RenderTextureFormat.Depth) ? 1 : 4);
				_Commands.SetGlobalTexture("_CameraDepthTexture", _CameraDepthTextureId);
				Unbind(waterCamera);
				Bind(waterCamera);
			}
		}

		public void Render(WaterCamera waterCamera, RenderTexture source, RenderTexture destination)
		{
		}

		private void Bind(WaterCamera waterCamera)
		{
			Camera cameraComponent = waterCamera.CameraComponent;
			bool singlePassStereoRendering = WaterProjectSettings.Instance.SinglePassStereoRendering;
			cameraComponent.AddCommandBuffer((cameraComponent.actualRenderingPath != RenderingPath.Forward) ? CameraEvent.BeforeLighting : ((!singlePassStereoRendering) ? CameraEvent.AfterDepthTexture : CameraEvent.BeforeForwardOpaque), _Commands);
		}

		private void Unbind(WaterCamera waterCamera)
		{
			Camera cameraComponent = waterCamera.CameraComponent;
			bool singlePassStereoRendering = WaterProjectSettings.Instance.SinglePassStereoRendering;
			cameraComponent.RemoveCommandBuffer((!singlePassStereoRendering) ? CameraEvent.AfterDepthTexture : CameraEvent.BeforeForwardOpaque, _Commands);
			cameraComponent.RemoveCommandBuffer(CameraEvent.BeforeLighting, _Commands);
		}
	}
}