129 lines
4.4 KiB
C#
129 lines
4.4 KiB
C#
using System;
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using UnityEngine;
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namespace UnityStandardAssets.ImageEffects
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{
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[ExecuteInEditMode]
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[RequireComponent(typeof(Camera))]
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[AddComponentMenu("Image Effects/Rendering/Global Fog")]
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public class GlobalFog : PostEffectsBase
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{
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[Tooltip("Apply distance-based fog?")]
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public bool distanceFog = true;
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[Tooltip("Exclude far plane pixels from distance-based fog? (Skybox or clear color)")]
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public bool excludeFarPixels = true;
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[Tooltip("Distance fog is based on radial distance from camera when checked")]
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public bool useRadialDistance;
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[Tooltip("Apply height-based fog?")]
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public bool heightFog = true;
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[Tooltip("Fog top Y coordinate")]
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public float height = 1f;
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[Range(0.001f, 10f)]
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public float heightDensity = 2f;
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[Tooltip("Push fog away from the camera by this amount")]
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public float startDistance;
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public Shader fogShader;
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private Material fogMaterial;
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public override bool CheckResources()
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{
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CheckSupport(true);
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fogMaterial = CheckShaderAndCreateMaterial(fogShader, fogMaterial);
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if (!isSupported)
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{
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ReportAutoDisable();
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}
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return isSupported;
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}
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[ImageEffectOpaque]
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private void OnRenderImage(RenderTexture source, RenderTexture destination)
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{
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if (!CheckResources() || (!distanceFog && !heightFog))
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{
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Graphics.Blit(source, destination);
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return;
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}
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Camera component = GetComponent<Camera>();
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Transform transform = component.transform;
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float nearClipPlane = component.nearClipPlane;
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float farClipPlane = component.farClipPlane;
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float fieldOfView = component.fieldOfView;
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float aspect = component.aspect;
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Matrix4x4 identity = Matrix4x4.identity;
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float num = fieldOfView * 0.5f;
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Vector3 vector = transform.right * nearClipPlane * Mathf.Tan(num * ((float)Math.PI / 180f)) * aspect;
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Vector3 vector2 = transform.up * nearClipPlane * Mathf.Tan(num * ((float)Math.PI / 180f));
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Vector3 vector3 = transform.forward * nearClipPlane - vector + vector2;
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float num2 = vector3.magnitude * farClipPlane / nearClipPlane;
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vector3.Normalize();
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vector3 *= num2;
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Vector3 vector4 = transform.forward * nearClipPlane + vector + vector2;
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vector4.Normalize();
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vector4 *= num2;
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Vector3 vector5 = transform.forward * nearClipPlane + vector - vector2;
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vector5.Normalize();
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vector5 *= num2;
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Vector3 vector6 = transform.forward * nearClipPlane - vector - vector2;
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vector6.Normalize();
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vector6 *= num2;
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identity.SetRow(0, vector3);
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identity.SetRow(1, vector4);
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identity.SetRow(2, vector5);
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identity.SetRow(3, vector6);
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Vector3 position = transform.position;
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float num3 = position.y - height;
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float z = ((!(num3 <= 0f)) ? 0f : 1f);
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float y = ((!excludeFarPixels) ? 2f : 1f);
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fogMaterial.SetMatrix("_FrustumCornersWS", identity);
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fogMaterial.SetVector("_CameraWS", position);
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fogMaterial.SetVector("_HeightParams", new Vector4(height, num3, z, heightDensity * 0.5f));
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fogMaterial.SetVector("_DistanceParams", new Vector4(0f - Mathf.Max(startDistance, 0f), y, 0f, 0f));
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FogMode fogMode = RenderSettings.fogMode;
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float fogDensity = RenderSettings.fogDensity;
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float fogStartDistance = RenderSettings.fogStartDistance;
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float fogEndDistance = RenderSettings.fogEndDistance;
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bool flag = fogMode == FogMode.Linear;
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float num4 = ((!flag) ? 0f : (fogEndDistance - fogStartDistance));
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float num5 = ((!(Mathf.Abs(num4) > 0.0001f)) ? 0f : (1f / num4));
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Vector4 value = default(Vector4);
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value.x = fogDensity * 1.2011224f;
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value.y = fogDensity * 1.442695f;
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value.z = ((!flag) ? 0f : (0f - num5));
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value.w = ((!flag) ? 0f : (fogEndDistance * num5));
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fogMaterial.SetVector("_SceneFogParams", value);
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fogMaterial.SetVector("_SceneFogMode", new Vector4((float)fogMode, useRadialDistance ? 1 : 0, 0f, 0f));
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int num6 = 0;
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CustomGraphicsBlit(passNr: (!distanceFog || !heightFog) ? (distanceFog ? 1 : 2) : 0, source: source, dest: destination, fxMaterial: fogMaterial);
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}
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private static void CustomGraphicsBlit(RenderTexture source, RenderTexture dest, Material fxMaterial, int passNr)
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{
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RenderTexture.active = dest;
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fxMaterial.SetTexture("_MainTex", source);
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GL.PushMatrix();
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GL.LoadOrtho();
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fxMaterial.SetPass(passNr);
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GL.Begin(7);
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GL.MultiTexCoord2(0, 0f, 0f);
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GL.Vertex3(0f, 0f, 3f);
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GL.MultiTexCoord2(0, 1f, 0f);
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GL.Vertex3(1f, 0f, 2f);
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GL.MultiTexCoord2(0, 1f, 1f);
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GL.Vertex3(1f, 1f, 1f);
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GL.MultiTexCoord2(0, 0f, 1f);
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GL.Vertex3(0f, 1f, 0f);
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GL.End();
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GL.PopMatrix();
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}
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}
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}
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