106 lines
3.5 KiB
C#
106 lines
3.5 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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[ExecuteInEditMode]
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[RequireComponent(typeof(Camera))]
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public class DepthOfFieldPostEffect : MonoBehaviour
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{
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public Material mat;
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[Range(0.0f, 100.0f)]
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public float focalDistance = 10.0f;
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[Range(0.0f, 100.0f)]
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public float nearBlurScale = 0.0f;
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[Range(0.0f, 1000.0f)]
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public float farBlurScale = 50.0f;
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//分辨率
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public int downSample = 1;
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//采样率
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public int samplerScale = 1;
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private Camera mCam;
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public Camera Cam
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{
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get
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{
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if (mCam == null)
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{
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mCam = GetComponent<Camera>();
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}
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return mCam;
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}
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}
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private void OnEnable()
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{
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if(Cam != null)
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{
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Cam.depthTextureMode |= DepthTextureMode.Depth;
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}
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}
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private void OnDisable()
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{
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if(Cam != null)
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{
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Cam.depthTextureMode &= ~DepthTextureMode.Depth;
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}
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}
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// Start is called before the first frame update
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void Start()
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{
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}
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// Update is called once per frame
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void Update()
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{
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}
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private void OnRenderImage(RenderTexture src, RenderTexture dest)
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{
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if(mat!=null)
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{
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//首先将我们设置的焦点限制在远近裁剪面之间
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Mathf.Clamp(focalDistance, Cam.nearClipPlane, Cam.farClipPlane);
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//申请两块RT，并且分辨率按照downSameple降低
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RenderTexture temp1 = RenderTexture.GetTemporary(src.width >> downSample, src.height >> downSample, 0, src.format);
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RenderTexture temp2 = RenderTexture.GetTemporary(src.width >> downSample, src.height >> downSample, 0, src.format);
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//直接将场景图拷贝到低分辨率的RT上达到降分辨率的效果
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Graphics.Blit(src, temp1);
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//高斯模糊，两次模糊，横向纵向，使用pass0进行高斯模糊
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mat.SetVector("_offsets", new Vector4(0, samplerScale, 0, 0));
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Graphics.Blit(temp1, temp2, mat, 0);
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mat.SetVector("_offsets", new Vector4(samplerScale, 0, 0, 0));
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Graphics.Blit(temp2, temp1, mat, 0);
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//景深操作，景深需要两的模糊效果图我们通过_BlurTex变量传入shader
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mat.SetTexture("_BlurTex", temp1);
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//设置shader的参数，主要是焦点和远近模糊的权重，权重可以控制插值时使用模糊图片的权重
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mat.SetFloat("_focalDistance", FocalDistance01(focalDistance));
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mat.SetFloat("_nearBlurScale", nearBlurScale);
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mat.SetFloat("_farBlurScale", farBlurScale);
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//使用pass1进行景深效果计算，清晰场景图直接从source输入到shader的_MainTex中
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Graphics.Blit(src, dest, mat, 1);
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//释放申请的RT
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RenderTexture.ReleaseTemporary(temp1);
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RenderTexture.ReleaseTemporary(temp2);
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}
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}
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//计算设置的焦点被转换到01空间中的距离，以便shader中通过这个01空间的焦点距离与depth比较
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private float FocalDistance01(float distance)
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{
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float dist = Cam.WorldToViewportPoint((distance - Cam.nearClipPlane) * Cam.transform.forward + Cam.transform.position).z / (Cam.farClipPlane - Cam.nearClipPlane);
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return dist;
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}
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}
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