Unity shader学习之屏幕后期处理效果之运动模糊

运动模糊，代码如下：

 1 using UnityEngine;
 2 
 3 public class MotionBlurRenderer : PostEffectRenderer
 4 {
 5     [Range(0.1f, 0.9f)]
 6     [SerializeField]
 7     float m_blurAmount = 0.1f;
 8 
 9     RenderTexture m_accumulationTexture;
10 
11     void OnDisable()
12     {
13         DestroyImmediate(m_accumulationTexture);
14     }
15 
16     protected override void OnRenderImage(RenderTexture src, RenderTexture dest)
17     {
18         if (!m_accumulationTexture || m_accumulationTexture.width != src.width || m_accumulationTexture.height != src.height)
19         {
20             DestroyImmediate(m_accumulationTexture);
21             m_accumulationTexture = new RenderTexture(src.width, src.height, 0);
22             //m_accumulationTexture.hideFlags = HideFlags.HideAndDontSave;
23             Graphics.Blit(src, m_accumulationTexture);
24         }
25 
26         //m_accumulationTexture.MarkRestoreExpected();
27 
28         Mat.SetFloat("_BlurAmount", m_blurAmount);
29 
30         Graphics.Blit(src, m_accumulationTexture, Mat);
31         Graphics.Blit(m_accumulationTexture, dest);
32 
33         base.OnRenderImage(src, dest);
34     }
35 
36     protected override string ShaderName
37     {
38         get { return "Custom/Study/Motion Shader"; }
39     }
40 }

MotionBlurRenderer

对应shader如下：

 1 // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
 2 
 3 Shader "Custom/Study/Motion Shader"
 4 {
 5     Properties
 6     {
 7         _MainTex ("Main Texture", 2D) = "white" {}
 8         _BlurAmount ("Blur Amount", Range(0,1)) = 0.5
 9     }
10 
11     SubShader
12     {
13         ZWrite Off
14         ZTest Always
15         Cull Off
16 
17         Pass
18         {
19             Blend SrcAlpha OneMinusSrcAlpha
20 
21             CGPROGRAM
22             #pragma vertex vert
23             #pragma fragment frag
24 
25             sampler2D _MainTex;
26             fixed _BlurAmount;
27 
28             struct appdata
29             {
30                 float4 vertex : POSITION;
31                 float2 uv : TEXCOORD0;
32             };
33 
34             struct v2f
35             {
36                 float4 pos : SV_POSITION;
37                 float2 uv : TEXCOORD0;
38             };
39 
40             v2f vert(appdata v)
41             {
42                 v2f o;
43                 o.pos = UnityObjectToClipPos(v.vertex);
44                 o.uv = v.uv;
45                 return o;
46             }
47 
48             fixed4 frag(v2f i) : SV_TARGET
49             {
50                 fixed4 tex = tex2D(_MainTex, i.uv);
51                 return fixed4(tex.rgb, _BlurAmount);
52             }
53 
54             ENDCG
55         }
56     }
57 
58     Fallback Off
59 }

Custom/Study/Motion Shader

效果如下：