투명디스플레이 연구사업

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/BlurShader4" {

	Properties {

		_MainTex ("Base (RGB)", 2D) = "white" {}

	}

	CGINCLUDE

		#include "UnityCG.cginc"

		sampler2D _MainTex;

		uniform half4 _MainTex_TexelSize;

		uniform half4 _Parameter;

		struct v2f_tap

		{

			float4 pos : SV_POSITION;

			half2 uv20 : TEXCOORD0;

			half2 uv21 : TEXCOORD1;

			half2 uv22 : TEXCOORD2;

			half2 uv23 : TEXCOORD3;

		};			

		v2f_tap vert4Tap ( appdata_img v )

		{

			v2f_tap o;

			o.pos = UnityObjectToClipPos (v.vertex);

        	o.uv20 = v.texcoord + _MainTex_TexelSize.xy;				

			o.uv21 = v.texcoord + _MainTex_TexelSize.xy * half2(-0.5h,-0.5h);	

			o.uv22 = v.texcoord + _MainTex_TexelSize.xy * half2(0.5h,-0.5h);		

			o.uv23 = v.texcoord + _MainTex_TexelSize.xy * half2(-0.5h,0.5h);		

			return o; 

		}					

		fixed4 fragDownsample ( v2f_tap i ) : SV_Target

		{				

			fixed4 color = tex2D (_MainTex, i.uv20);

			color += tex2D (_MainTex, i.uv21);

			color += tex2D (_MainTex, i.uv22);

			color += tex2D (_MainTex, i.uv23);

			return color / 4;

		}

		// weight curves

		static const half curve[7] = { 0.0205, 0.0855, 0.232, 0.324, 0.232, 0.0855, 0.0205 };  // gauss'ish blur weights

		static const half4 curve4[7] = { half4(0.0205,0.0205,0.0205,0), half4(0.0855,0.0855,0.0855,0), half4(0.232,0.232,0.232,0),

			half4(0.324,0.324,0.324,1), half4(0.232,0.232,0.232,0), half4(0.0855,0.0855,0.0855,0), half4(0.0205,0.0205,0.0205,0) };

		struct v2f_withBlurCoords8 

		{

			float4 pos : SV_POSITION;

			half4 uv : TEXCOORD0;

			half2 offs : TEXCOORD1;

		};	

		struct v2f_withBlurCoordsSGX 

		{

			float4 pos : SV_POSITION;

			half2 uv : TEXCOORD0;

			half4 offs[3] : TEXCOORD1;

		};

		v2f_withBlurCoords8 vertBlurHorizontal (appdata_img v)

		{

			v2f_withBlurCoords8 o;

			o.pos = UnityObjectToClipPos (v.vertex);

			o.uv = half4(v.texcoord.xy,1,1);

			o.offs = _MainTex_TexelSize.xy * half2(1.0, 0.0) * _Parameter.x;

			return o; 

		}

		v2f_withBlurCoords8 vertBlurVertical (appdata_img v)

		{

			v2f_withBlurCoords8 o;

			o.pos = UnityObjectToClipPos (v.vertex);

			o.uv = half4(v.texcoord.xy,1,1);

			o.offs = _MainTex_TexelSize.xy * half2(0.0, 1.0) * _Parameter.x;

			return o; 

		}	

		half4 fragBlur8 ( v2f_withBlurCoords8 i ) : SV_Target

		{

			half2 uv = i.uv.xy; 

			half2 netFilterWidth = i.offs;  

			half2 coords = uv - netFilterWidth * 3.0;  

			half4 color = 0;

  			for( int l = 0; l < 7; l++ )  

  			{   

				half4 tap = tex2D(_MainTex, coords);

				color += tap * curve4[l];

				coords += netFilterWidth;

  			}

			return color;

		}

		v2f_withBlurCoordsSGX vertBlurHorizontalSGX (appdata_img v)

		{

			v2f_withBlurCoordsSGX o;

			o.pos = UnityObjectToClipPos (v.vertex);

			o.uv = v.texcoord.xy;

			half2 netFilterWidth = _MainTex_TexelSize.xy * half2(1.0, 0.0) * _Parameter.x; 

			half4 coords = -netFilterWidth.xyxy * 3.0;

			o.offs[0] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			coords += netFilterWidth.xyxy;

			o.offs[1] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			coords += netFilterWidth.xyxy;

			o.offs[2] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			return o; 

		}		

		v2f_withBlurCoordsSGX vertBlurVerticalSGX (appdata_img v)

		{

			v2f_withBlurCoordsSGX o;

			o.pos = UnityObjectToClipPos (v.vertex);

			o.uv = half4(v.texcoord.xy,1,1);

			half2 netFilterWidth = _MainTex_TexelSize.xy * half2(0.0, 1.0) * _Parameter.x;

			half4 coords = -netFilterWidth.xyxy * 3.0;

			o.offs[0] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			coords += netFilterWidth.xyxy;

			o.offs[1] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			coords += netFilterWidth.xyxy;

			o.offs[2] = v.texcoord.xyxy + coords * half4(1.0h,1.0h,-1.0h,-1.0h);

			return o; 

		}	

		half4 fragBlurSGX ( v2f_withBlurCoordsSGX i ) : SV_Target

		{

			half2 uv = i.uv.xy;

			half4 color = tex2D(_MainTex, i.uv) * curve4[3];

  			for( int l = 0; l < 3; l++ )  

  			{   

				half4 tapA = tex2D(_MainTex, i.offs[l].xy);

				half4 tapB = tex2D(_MainTex, i.offs[l].zw); 

				color += (tapA + tapB) * curve4[l];

  			}

			return color;

		}	

	ENDCG

	SubShader {

	  ZTest Off Cull Off ZWrite Off Blend Off

	// 0

	Pass { 

		CGPROGRAM

		#pragma vertex vert4Tap

		#pragma fragment fragDownsample

		ENDCG

		}

	// 1

	Pass {

		ZTest Always

		Cull Off

		CGPROGRAM 

		#pragma vertex vertBlurVertical

		#pragma fragment fragBlur8

		ENDCG 

		}	

	// 2

	Pass {		

		ZTest Always

		Cull Off

		CGPROGRAM

		#pragma vertex vertBlurHorizontal

		#pragma fragment fragBlur8

		ENDCG

		}	

	// alternate blur

	// 3

	Pass {

		ZTest Always

		Cull Off

		CGPROGRAM 

		#pragma vertex vertBlurVerticalSGX

		#pragma fragment fragBlurSGX

		ENDCG

		}	

	// 4

	Pass {		

		ZTest Always

		Cull Off

		CGPROGRAM

		#pragma vertex vertBlurHorizontalSGX

		#pragma fragment fragBlurSGX

		ENDCG

		}	

	}	

	FallBack Off

}