GameVsJam/3d Prototyp/Assets/AssetPacks/Barrier Pack/Scripts/GlobalFog.cs

148 lines
5.2 KiB
C#

using System;
using UnityEngine;
namespace UnityStandardAssets.ImageEffects
{
[ExecuteInEditMode]
[RequireComponent (typeof(Camera))]
[AddComponentMenu ("Image Effects/Rendering/Global Fog")]
class GlobalFog : PostEffectsBase
{
[Tooltip("Apply distance-based fog?")]
public bool distanceFog = true;
[Tooltip("Distance fog is based on radial distance from camera when checked")]
public bool useRadialDistance = false;
[Tooltip("Apply height-based fog?")]
public bool heightFog = true;
[Tooltip("Fog top Y coordinate")]
public float height = 1.0f;
[Range(0.001f,10.0f)]
public float heightDensity = 2.0f;
[Tooltip("Push fog away from the camera by this amount")]
public float startDistance = 0.0f;
public Shader fogShader = null;
private Material fogMaterial = null;
public override bool CheckResources ()
{
CheckSupport (true);
fogMaterial = CheckShaderAndCreateMaterial (fogShader, fogMaterial);
if (!isSupported)
ReportAutoDisable ();
return isSupported;
}
[ImageEffectOpaque]
void OnRenderImage (RenderTexture source, RenderTexture destination)
{
if (CheckResources()==false || (!distanceFog && !heightFog))
{
Graphics.Blit (source, destination);
return;
}
Camera cam = GetComponent<Camera>();
Transform camtr = cam.transform;
float camNear = cam.nearClipPlane;
float camFar = cam.farClipPlane;
float camFov = cam.fieldOfView;
float camAspect = cam.aspect;
Matrix4x4 frustumCorners = Matrix4x4.identity;
float fovWHalf = camFov * 0.5f;
Vector3 toRight = camtr.right * camNear * Mathf.Tan (fovWHalf * Mathf.Deg2Rad) * camAspect;
Vector3 toTop = camtr.up * camNear * Mathf.Tan (fovWHalf * Mathf.Deg2Rad);
Vector3 topLeft = (camtr.forward * camNear - toRight + toTop);
float camScale = topLeft.magnitude * camFar/camNear;
topLeft.Normalize();
topLeft *= camScale;
Vector3 topRight = (camtr.forward * camNear + toRight + toTop);
topRight.Normalize();
topRight *= camScale;
Vector3 bottomRight = (camtr.forward * camNear + toRight - toTop);
bottomRight.Normalize();
bottomRight *= camScale;
Vector3 bottomLeft = (camtr.forward * camNear - toRight - toTop);
bottomLeft.Normalize();
bottomLeft *= camScale;
frustumCorners.SetRow (0, topLeft);
frustumCorners.SetRow (1, topRight);
frustumCorners.SetRow (2, bottomRight);
frustumCorners.SetRow (3, bottomLeft);
var camPos= camtr.position;
float FdotC = camPos.y-height;
float paramK = (FdotC <= 0.0f ? 1.0f : 0.0f);
fogMaterial.SetMatrix ("_FrustumCornersWS", frustumCorners);
fogMaterial.SetVector ("_CameraWS", camPos);
fogMaterial.SetVector ("_HeightParams", new Vector4 (height, FdotC, paramK, heightDensity*0.5f));
fogMaterial.SetVector ("_DistanceParams", new Vector4 (-Mathf.Max(startDistance,0.0f), 0, 0, 0));
var sceneMode= RenderSettings.fogMode;
var sceneDensity= RenderSettings.fogDensity;
var sceneStart= RenderSettings.fogStartDistance;
var sceneEnd= RenderSettings.fogEndDistance;
Vector4 sceneParams;
bool linear = (sceneMode == FogMode.Linear);
float diff = linear ? sceneEnd - sceneStart : 0.0f;
float invDiff = Mathf.Abs(diff) > 0.0001f ? 1.0f / diff : 0.0f;
sceneParams.x = sceneDensity * 1.2011224087f; // density / sqrt(ln(2)), used by Exp2 fog mode
sceneParams.y = sceneDensity * 1.4426950408f; // density / ln(2), used by Exp fog mode
sceneParams.z = linear ? -invDiff : 0.0f;
sceneParams.w = linear ? sceneEnd * invDiff : 0.0f;
fogMaterial.SetVector ("_SceneFogParams", sceneParams);
fogMaterial.SetVector ("_SceneFogMode", new Vector4((int)sceneMode, useRadialDistance ? 1 : 0, 0, 0));
int pass = 0;
if (distanceFog && heightFog)
pass = 0; // distance + height
else if (distanceFog)
pass = 1; // distance only
else
pass = 2; // height only
CustomGraphicsBlit (source, destination, fogMaterial, pass);
}
static void CustomGraphicsBlit (RenderTexture source, RenderTexture dest, Material fxMaterial, int passNr)
{
RenderTexture.active = dest;
fxMaterial.SetTexture ("_MainTex", source);
GL.PushMatrix ();
GL.LoadOrtho ();
fxMaterial.SetPass (passNr);
GL.Begin (GL.QUADS);
GL.MultiTexCoord2 (0, 0.0f, 0.0f);
GL.Vertex3 (0.0f, 0.0f, 3.0f); // BL
GL.MultiTexCoord2 (0, 1.0f, 0.0f);
GL.Vertex3 (1.0f, 0.0f, 2.0f); // BR
GL.MultiTexCoord2 (0, 1.0f, 1.0f);
GL.Vertex3 (1.0f, 1.0f, 1.0f); // TR
GL.MultiTexCoord2 (0, 0.0f, 1.0f);
GL.Vertex3 (0.0f, 1.0f, 0.0f); // TL
GL.End ();
GL.PopMatrix ();
}
}
}