UnityShaderBook/Assets/Shaders/Extra/ImageEffect/ImageScanner.shader

Shader "Hidden/ImageScanner"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_ScannerScale ("Scanner Scale", Float) = 1
		_DepthScale ("Depth Scale", Float) = 1
		_ScannerTex ("Texture", 2D) = "white" {}
		_TexX ("Tex X",Float) = 0
		_TexY ("Tex Y",Float) = 0
		_ScannerColor ("Scanner Color",Color) = (1,1,1,1)
		_ScannerStrength ("Scanner Strength",Float) = 1
	}
	SubShader
	{
		// No culling or depth
		Cull Off ZWrite Off ZTest Always

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			sampler2D _CameraDepthTexture;
			sampler2D _CameraDepthNormalsTexture;
			sampler2D _MainTex;
			half _ScannerScale;
			float _DepthScale;
			sampler2D _ScannerTex;
			float4 _ScannerTex_ST;
			float _TexX;
			float _TexY;
			fixed4 _ScannerColor;
			float _ScannerStrength;

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
				//float4 scrPos : TEXCOORD1;
			};

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				//o.scrPos = ComputeGrabScreenPos(o.vertex);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.uv);
				fixed4 refrCol = tex2D(_CameraDepthTexture, i.uv);
				fixed3 normal = DecodeViewNormalStereo(tex2D(_CameraDepthNormalsTexture,i.uv));
				fixed3 absnormal = abs(normal);
				//_ScannerTex_ST.xy = float2(_TexX,_TexY);
				i.uv = TRANSFORM_TEX(i.uv, _ScannerTex);
				i.uv = abs(0.5-i.uv)*float2(absnormal.r+1,absnormal.g+1);
				i.uv = i.uv*float2(_TexX,_TexY);
				//i.uv = i.uv*abs(float2(abs(normal.r*0.5+0.5)*_TexX,abs(normal.g*0.5+0.5)*_TexY));
				fixed4 scannerTex = tex2D(_ScannerTex,i.uv);
				float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);
				float linearDepth = LinearEyeDepth(refrCol.r);
				float diff = linearDepth-_ScannerScale;
				float diff2 = linearDepth-_ScannerScale+_DepthScale;
				fixed4 border = 1-(saturate(diff*2)+saturate(-diff2*0.1));
				// just invert the colors
				col.rgb = col.rgb+border*scannerTex*_ScannerColor*_ScannerStrength;
				return col;
				
				//fixed3 normal = DecodeViewNormalStereo(tex2D(_CameraDepthNormalsTexture,i.uv));
				//return fixed4 (normal,1.0);
				//return fixed4 (absnormal,1.0)+scannerTex*_ScannerColor;

			}
			ENDCG
		}
	}
}