using System;
using UnityEngine;

namespace Artngame.SKYMASTER
{
	[ExecuteInEditMode]
	public class AtmosphericScatteringDeferredSkyMaster : PostEffectsBaseSkyMaster
	{
		[HideInInspector]
		public Shader deferredFogShader;

		private Material m_fogMaterial;

		public Texture2D FractalTex;

		public float TextureAmount;

		public override bool CheckResources()
		{
			CheckSupport(needDepth: true);
			if (!deferredFogShader)
			{
				deferredFogShader = Shader.Find("Hidden/AtmosphericScattering_DeferredSM34");
			}
			m_fogMaterial = CheckShaderAndCreateMaterial(deferredFogShader, m_fogMaterial);
			if (!isSupported)
			{
				ReportAutoDisable();
			}
			return isSupported;
		}

		[ImageEffectOpaque]
		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			Camera component = GetComponent<Camera>();
			if (!CheckResources() || ((!component || component.actualRenderingPath != RenderingPath.DeferredShading) && (!AtmosphericScatteringSkyMaster.instance || !AtmosphericScatteringSkyMaster.instance.forcePostEffect)))
			{
				Graphics.Blit(source, destination);
				return;
			}
			Transform obj = 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 = obj.right * nearClipPlane * Mathf.Tan(num * (MathF.PI / 180f)) * aspect;
			Vector3 vector2 = obj.up * nearClipPlane * Mathf.Tan(num * (MathF.PI / 180f));
			Vector3 vector3 = obj.forward * nearClipPlane - vector + vector2;
			float num2 = vector3.magnitude * farClipPlane / nearClipPlane;
			vector3.Normalize();
			vector3 *= num2;
			Vector3 vector4 = obj.forward * nearClipPlane + vector + vector2;
			vector4.Normalize();
			vector4 *= num2;
			Vector3 vector5 = obj.forward * nearClipPlane + vector - vector2;
			vector5.Normalize();
			vector5 *= num2;
			Vector3 vector6 = obj.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 = obj.position;
			m_fogMaterial.SetMatrix("_FrustumCornersWS", identity);
			m_fogMaterial.SetVector("_CameraWS", position);
			CustomGraphicsBlit(source, destination, m_fogMaterial, 0, FractalTex, TextureAmount);
		}

		private static void CustomGraphicsBlit(RenderTexture src, RenderTexture dst, Material mat, int pass, Texture2D FractalTex, float TextureAmount)
		{
			RenderTexture.active = dst;
			mat.SetTexture("_MainTex", src);
			mat.SetTexture("_MainTex2", FractalTex);
			mat.SetFloat("_TextureAmount", TextureAmount);
			GL.PushMatrix();
			GL.LoadOrtho();
			mat.SetPass(pass);
			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();
		}
	}
}