├── README.md
├── gradient.png
├── rollingshutter.gif
├── maskBlit.shader
├── RollingShutter.cs
└── maskBlit.mat


/README.md:
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1 | ![preview gif](rollingshutter.gif)
2 | 


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/gradient.png:
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https://raw.githubusercontent.com/cmacmillan/RollingShutter/HEAD/gradient.png


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/rollingshutter.gif:
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https://raw.githubusercontent.com/cmacmillan/RollingShutter/HEAD/rollingshutter.gif


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/maskBlit.shader:
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 1 | Shader "Unlit/maskBlit"
 2 | {
 3 |     Properties
 4 |     {
 5 |         _MainTex ("Texture", 2D) = "white" {}
 6 |         _MaskTex ("Mask", 2D) = "white" {}
 7 |     }
 8 |     SubShader
 9 |     {
10 |         Tags { "RenderType"="Opaque" }
11 |         LOD 100
12 | 
13 |         Pass
14 |         {
15 |             CGPROGRAM
16 |             #pragma vertex vert
17 |             #pragma fragment frag
18 | 
19 |             #include "UnityCG.cginc"
20 | 
21 |             struct appdata
22 |             {
23 |                 float4 vertex : POSITION;
24 |                 float2 uv : TEXCOORD0;
25 |             };
26 | 
27 |             struct v2f
28 |             {
29 |                 float2 uv : TEXCOORD0;
30 |                 float4 vertex : SV_POSITION;
31 |             };
32 | 
33 |             sampler2D _MainTex;
34 |             sampler2D _MaskTex;
35 |             float4 _MainTex_ST;
36 |             float _MaskPercentage;
37 | 
38 |             v2f vert (appdata v)
39 |             {
40 |                 v2f o;
41 |                 o.vertex = UnityObjectToClipPos(v.vertex);
42 |                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);
43 |                 return o;
44 |             }
45 | 
46 |             fixed4 frag (v2f i) : SV_Target
47 |             {
48 |                 //fixed4 col = tex2D(_MaskTex, i.uv);
49 |                 //if (col.r < _MaskPercentage)//commented out to avoid issues with 8 bit per channel textures, could be fixed by using higher precision textures
50 |                 if (i.uv.y<_MaskPercentage)
51 |                     discard;
52 |                 return tex2D(_MainTex, i.uv);
53 |             }
54 |             ENDCG
55 |         }
56 |     }
57 | }
58 | 


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/RollingShutter.cs:
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 1 | using System.Collections;
 2 | using System.Collections.Generic;
 3 | using UnityEngine;
 4 | using UnityEngine.Rendering;
 5 | 
 6 | public class RollingShutter : MonoBehaviour
 7 | {
 8 |     public Camera sceneCamera;
 9 |     public Camera compositorCamera;
10 |     public Material maskMaterial;
11 |     public int temporalResolution = 100;
12 |     public RenderTextureFormat textureFormat = RenderTextureFormat.RGB565;
13 | 
14 |     private CommandBuffer commandBuffer;
15 |     private List<RenderTexture> renderTextures = new List<RenderTexture>();
16 | 
17 |     private void Start()
18 |     {
19 |         QualitySettings.vSyncCount = 2;
20 |         Application.targetFrameRate = 60;
21 |         int w = Screen.width;
22 |         int h = Screen.height;
23 |         for (int i = 0; i < temporalResolution; i++)
24 |         {
25 |             renderTextures.Add(new RenderTexture(w, h, 0, textureFormat, 0));
26 |         }
27 |         commandBuffer = new CommandBuffer();
28 |         commandBuffer.name = "Rolling shutter effect";
29 |         compositorCamera.AddCommandBuffer(CameraEvent.AfterEverything, commandBuffer);
30 |     }
31 | 
32 |     void Update()
33 |     {
34 |         renderTextures.Insert(0, renderTextures[renderTextures.Count - 1]);
35 |         renderTextures.RemoveAt(renderTextures.Count - 1);
36 |         sceneCamera.targetTexture=renderTextures[0];
37 | 
38 |         commandBuffer.Clear();
39 |         for (int i = 0; i < temporalResolution; i++)
40 |         {
41 |             commandBuffer.SetGlobalFloat("_MaskPercentage",(float)i/temporalResolution);
42 |             commandBuffer.Blit(renderTextures[i],BuiltinRenderTextureType.CameraTarget,maskMaterial);//the target is the screen
43 |         }
44 |     }
45 | }
46 | 


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