[Unity] UI Blur Shader

스토어에 deprecated되어있어 개인적으로 사용하기 위해 블로깅해둠.

Shader "UI/Blur/UIBlurHQ" {
  Properties {
    _TintColor ("Tint Color", Color) = (1, 1, 1, 0.2)
    _Size ("Spacing", Range(0, 40)) = 5.0
    _Vibrancy ("Vibrancy", Range(0, 2)) = 0.2
    _MainTex ("Texture", 2D) = "white" {}

    [HideInInspector]
    _StencilComp ("Stencil Comparison", Float) = 8
    [HideInInspector]
    _Stencil ("Stencil ID", Float) = 0
    [HideInInspector]
    _StencilOp ("Stencil Operation", Float) = 0
    [HideInInspector]
    _StencilWriteMask ("Stencil Write Mask", Float) = 255
    [HideInInspector]
    _StencilReadMask ("Stencil Read Mask", Float) = 255
    [HideInInspector]
    _ColorMask ("Color Mask", Color) = (1, 1, 1, 0.2)

  }
 
  Category {
    // We must be transparent, so other objects are drawn before this one.
    Tags { 
      "Queue"="Transparent"
      "IgnoreProjector"="True" 
      "RenderType"="Opaque" 
    }

    Stencil {
      Ref [_Stencil]
      Comp [_StencilComp]
      Pass [_StencilOp] 
      ReadMask [_StencilReadMask]
      WriteMask [_StencilWriteMask]
    }

    SubShader {

      GrabPass {
        // "_GrabTexture" // Uncomment to speed-up, see documentation.
        Tags { "LightMode" = "Always" }
      }
      
      // Vertical blur
      Pass {
        Name "VERTICAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"
         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernely) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x, i.uvgrab.y + _GrabTexture_TexelSize.y * kernely * _Size * 1.61, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
          return sum;
        }
        
        ENDCG
      }

      GrabPass {
        Tags { "LightMode" = "Always" }
      }

      // Horizontal blur
      Pass {
        Name "HORIZONTAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"

         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernelx) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x + _GrabTexture_TexelSize.x * kernelx * _Size * 1.61, i.uvgrab.y, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
          return sum;
        }
        
        ENDCG
      }
        
      GrabPass {
        Tags { "LightMode" = "Always" }
      }
      
      // Vertical blur
      Pass {
        Name "VERTICAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"
         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernely) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x, i.uvgrab.y + _GrabTexture_TexelSize.y * kernely * _Size, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
          return sum;
        }
        
        ENDCG
      }

      GrabPass {             
        Tags { "LightMode" = "Always" }
      }

      // Horizontal blur
      Pass {
        Name "HORIZONTAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"
         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernelx) tex2Dproj(_GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x + _GrabTexture_TexelSize.x * kernelx * _Size, i.uvgrab.y, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
          return sum;
        }
        
        ENDCG
      }
      GrabPass {
        Tags { "LightMode" = "Always" }
      }
      
      // Vertical blur
      Pass {
        Name "VERTICAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"
         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernely) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x, i.uvgrab.y + _GrabTexture_TexelSize.y * kernely * _Size * 0.2, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
          return sum;
        }
        
        ENDCG
      }

      GrabPass {             
        Tags { "LightMode" = "Always" }
      }

      // Horizontal blur
      Pass {
        Name "HORIZONTAL"
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"
         
        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };

        float4 _MainTex_ST;
         
        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        float _Size;
        sampler2D _MainTex;
         
        half4 frag( v2f i ) : COLOR {
          half4 sum = half4(0,0,0,0);
 
          #define GRABPIXEL(weight,kernelx) tex2Dproj(_GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x + _GrabTexture_TexelSize.x * kernelx * _Size * 0.2, i.uvgrab.y, i.uvgrab.z, i.uvgrab.w))) * weight
 
          sum += GRABPIXEL(0.05, -4.0);
          sum += GRABPIXEL(0.09, -3.0);
          sum += GRABPIXEL(0.12, -2.0);
          sum += GRABPIXEL(0.15, -1.0);
          sum += GRABPIXEL(0.18,  0.0);
          sum += GRABPIXEL(0.15, +1.0);
          sum += GRABPIXEL(0.12, +2.0);
          sum += GRABPIXEL(0.09, +3.0);
          sum += GRABPIXEL(0.05, +4.0);

          half4 texcol = tex2D(_MainTex, i.uv);
          sum.a = texcol.a;
           
          return sum;
        }
        
        ENDCG
      }
 
      // Distortion
      GrabPass {             
        Tags { "LightMode" = "Always" }
      }
      
      Pass {
        Tags { "LightMode" = "Always" }

        Blend SrcAlpha OneMinusSrcAlpha
        CGPROGRAM
        // Upgrade NOTE: excluded shader from DX11 and Xbox360; has structs without semantics (struct v2f members uv)
        // #pragma exclude_renderers d3d11 xbox360
        #pragma vertex vert
        #pragma fragment frag
        #pragma fragmentoption ARB_precision_hint_fastest
        #include "UnityCG.cginc"

        struct appdata_t {
          float4 vertex : POSITION;
          float2 texcoord: TEXCOORD0;
        };
         
        struct v2f {
          float4 vertex : POSITION;
          float4 uvgrab : TEXCOORD0;
          float2 uv : TEXCOORD1;
        };
         
        float4 _MainTex_ST;

        v2f vert (appdata_t v) {
          v2f o;
          o.vertex = UnityObjectToClipPos(v.vertex);
          #if UNITY_UV_STARTS_AT_TOP
          float scale = -1.0;
          #else
          float scale = 1.0;
          #endif
          o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
          o.uvgrab.zw = o.vertex.zw;
          o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
          return o;
        }
         
        half4 _TintColor;
        float _Vibrancy;
        sampler2D _GrabTexture;
        float4 _GrabTexture_TexelSize;
        sampler2D _MainTex;
        
        half4 frag( v2f i ) : COLOR {
          half4 col = tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(i.uvgrab));
          half4 texcol = tex2D(_MainTex, i.uv);
          col.r *= texcol.r;
          col.g *= texcol.g;
          col.b *= texcol.b;
          col.rgb *= 1 + _Vibrancy;
          col.a = texcol.a;
          col = lerp (col, _TintColor, _TintColor.w);
          return col;
        }
        
        ENDCG
      }
    }
  }
}

Material생성 후 해당 Shader적용 후 UI Image에 Material 적용.