using System;
using UnityEngine;

namespace Artngame.SKYMASTER
{
	[ExecuteInEditMode]
	[RequireComponent(typeof(Camera))]
	[AddComponentMenu("Image Effects/Rendering/Global Fog Sky Master")]
	public class GlobalFogSkyMaster : PostEffectsBaseSkyMaster
	{
		[Tooltip("Apply distance-based fog?")]
		public bool distanceFog = true;

		[Tooltip("Distance fog is based on radial distance from camera when checked")]
		public bool useRadialDistance;

		[Tooltip("Apply height-based fog?")]
		public bool heightFog = true;

		[Tooltip("Fog top Y coordinate")]
		public float height = 1f;

		[Range(1E-05f, 10f)]
		public float heightDensity = 2f;

		[Tooltip("Push fog away from the camera by this amount")]
		public float startDistance;

		public Gradient DistGradient = new Gradient();

		public Vector2 GradientBounds = Vector2.zero;

		public float luminance = 0.8f;

		public float lumFac = 0.9f;

		public float ScatterFac = 24.4f;

		public float TurbFac = 324.74f;

		public float HorizFac = 1f;

		public float turbidity = 10f;

		public float reileigh = 0.8f;

		public float mieCoefficient = 0.1f;

		public float mieDirectionalG = 0.7f;

		public float bias = 0.6f;

		public float contrast = 4.12f;

		public Transform Sun;

		public bool FogSky;

		public Vector3 TintColor = new Vector3(68f, 155f, 345f);

		public float ClearSkyFac = 1f;

		public Shader fogShader;

		private Material fogMaterial;

		public SkyMasterManager SkyManager;

		private Texture2D colourPalette;

		private bool Made_texture;

		public int gradientResolution = 256;

		private Color[] colourArray;

		private void Update()
		{
			if (colourArray == null)
			{
				colourArray = new Color[gradientResolution];
			}
			for (int i = 0; i < colourArray.Length; i++)
			{
				colourArray[i] = DistGradient.Evaluate((float)i / (float)colourArray.Length);
			}
			if (!Made_texture)
			{
				colourPalette = new Texture2D(gradientResolution, 10, TextureFormat.ARGB32, mipChain: false);
				colourPalette.filterMode = FilterMode.Point;
				colourPalette.wrapMode = TextureWrapMode.Clamp;
				Made_texture = true;
			}
			for (int j = 0; j < gradientResolution; j++)
			{
				for (int k = 0; k < 10; k++)
				{
					colourPalette.SetPixel(j, k, colourArray[j]);
				}
			}
			colourPalette.Apply();
		}

		private void Awake()
		{
			colourArray = new Color[gradientResolution];
			for (int i = 0; i < colourArray.Length; i++)
			{
				colourArray[i] = DistGradient.Evaluate((float)i / (float)colourArray.Length);
			}
			if (!Made_texture)
			{
				colourPalette = new Texture2D(gradientResolution, 10, TextureFormat.ARGB32, mipChain: false);
				colourPalette.filterMode = FilterMode.Point;
				colourPalette.wrapMode = TextureWrapMode.Clamp;
				Made_texture = true;
			}
			for (int j = 0; j < gradientResolution; j++)
			{
				for (int k = 0; k < 10; k++)
				{
					colourPalette.SetPixel(j, k, colourArray[j]);
				}
			}
			colourPalette.Apply();
		}

		public override bool CheckResources()
		{
			CheckSupport(needDepth: true);
			fogMaterial = CheckShaderAndCreateMaterial(fogShader, fogMaterial);
			if (!isSupported)
			{
				ReportAutoDisable();
			}
			return isSupported;
		}

		[ImageEffectOpaque]
		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			if (!CheckResources() || (!distanceFog && !heightFog))
			{
				Graphics.Blit(source, destination);
				return;
			}
			Camera component = GetComponent<Camera>();
			Transform transform = component.transform;
			float nearClipPlane = component.nearClipPlane;
			float farClipPlane = component.farClipPlane;
			float fieldOfView = component.fieldOfView;
			float aspect = component.aspect;
			Matrix4x4 identity = Matrix4x4.identity;
			float num = fieldOfView * 0.5f;
			Vector3 vector = transform.right * nearClipPlane * Mathf.Tan(num * (MathF.PI / 180f)) * aspect;
			Vector3 vector2 = transform.up * nearClipPlane * Mathf.Tan(num * (MathF.PI / 180f));
			Vector3 vector3 = transform.forward * nearClipPlane - vector + vector2;
			float num2 = vector3.magnitude * farClipPlane / nearClipPlane;
			vector3.Normalize();
			vector3 *= num2;
			Vector3 vector4 = transform.forward * nearClipPlane + vector + vector2;
			vector4.Normalize();
			vector4 *= num2;
			Vector3 vector5 = transform.forward * nearClipPlane + vector - vector2;
			vector5.Normalize();
			vector5 *= num2;
			Vector3 vector6 = transform.forward * nearClipPlane - vector - vector2;
			vector6.Normalize();
			vector6 *= num2;
			identity.SetRow(0, vector3);
			identity.SetRow(1, vector4);
			identity.SetRow(2, vector5);
			identity.SetRow(3, vector6);
			Vector3 position = transform.position;
			float num3 = position.y - height;
			float z = ((num3 <= 0f) ? 1f : 0f);
			fogMaterial.SetMatrix("_FrustumCornersWS", identity);
			fogMaterial.SetVector("_CameraWS", position);
			fogMaterial.SetVector("_HeightParams", new Vector4(height, num3, z, heightDensity * 0.5f));
			fogMaterial.SetVector("_DistanceParams", new Vector4(0f - Mathf.Max(startDistance, 0f), 0f, 0f, 0f));
			fogMaterial.SetFloat("luminance", luminance);
			fogMaterial.SetFloat("lumFac", lumFac);
			fogMaterial.SetFloat("Multiplier1", ScatterFac);
			fogMaterial.SetFloat("Multiplier2", TurbFac);
			fogMaterial.SetFloat("Multiplier3", HorizFac);
			fogMaterial.SetFloat("turbidity", turbidity);
			fogMaterial.SetFloat("reileigh", reileigh);
			fogMaterial.SetFloat("mieCoefficient", mieCoefficient);
			fogMaterial.SetFloat("mieDirectionalG", mieDirectionalG);
			fogMaterial.SetFloat("bias", bias);
			fogMaterial.SetFloat("contrast", contrast);
			fogMaterial.SetVector("v3LightDir", -Sun.forward);
			fogMaterial.SetVector("_TintColor", new Vector4(TintColor.x, TintColor.y, TintColor.z, 1f));
			float value = 0f;
			if (FogSky)
			{
				value = 1f;
			}
			fogMaterial.SetFloat("FogSky", value);
			fogMaterial.SetFloat("ClearSkyFac", ClearSkyFac);
			FogMode fogMode = RenderSettings.fogMode;
			float num4 = 0.01f;
			float fogStartDistance = RenderSettings.fogStartDistance;
			float fogEndDistance = RenderSettings.fogEndDistance;
			bool flag = fogMode == FogMode.Linear;
			float num5 = (flag ? (fogEndDistance - fogStartDistance) : 0f);
			float num6 = ((Mathf.Abs(num5) > 0.0001f) ? (1f / num5) : 0f);
			Vector4 value2 = default(Vector4);
			value2.x = num4 * 1.2011224f;
			value2.y = num4 * 1.442695f;
			value2.z = (flag ? (0f - num6) : 0f);
			value2.w = (flag ? (fogEndDistance * num6) : 0f);
			fogMaterial.SetVector("_SceneFogParams", value2);
			fogMaterial.SetVector("_SceneFogMode", new Vector4((float)fogMode, useRadialDistance ? 1 : 0, 0f, 0f));
			int num7 = 0;
			CustomGraphicsBlit(passNr: (!distanceFog || !heightFog) ? (distanceFog ? 1 : 2) : 0, source: source, dest: destination, fxMaterial: fogMaterial, DistGradient: DistGradient, GradientBounds: GradientBounds, colourPalette: colourPalette);
		}

		private static void CustomGraphicsBlit(RenderTexture source, RenderTexture dest, Material fxMaterial, int passNr, Gradient DistGradient, Vector2 GradientBounds, Texture2D colourPalette)
		{
			RenderTexture.active = dest;
			fxMaterial.SetTexture("_MainTex", source);
			fxMaterial.SetTexture("_ColorRamp", colourPalette);
			if (GradientBounds != Vector2.zero)
			{
				fxMaterial.SetFloat("_Close", GradientBounds.x);
				fxMaterial.SetFloat("_Far", GradientBounds.y);
			}
			GL.PushMatrix();
			GL.LoadOrtho();
			fxMaterial.SetPass(passNr);
			GL.Begin(7);
			GL.MultiTexCoord2(0, 0f, 0f);
			GL.Vertex3(0f, 0f, 3f);
			GL.MultiTexCoord2(0, 1f, 0f);
			GL.Vertex3(1f, 0f, 2f);
			GL.MultiTexCoord2(0, 1f, 1f);
			GL.Vertex3(1f, 1f, 1f);
			GL.MultiTexCoord2(0, 0f, 1f);
			GL.Vertex3(0f, 1f, 0f);
			GL.End();
			GL.PopMatrix();
		}
	}
}