Init

Assets/Scripts/Shaders/SimpleGrabPassBlur.shader

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+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+Shader "Unlit/FrostedGlass"
+{
+    Properties
+    {
+        _Radius("Radius", Range(1, 255)) = 1
+    }
+
+        Category
+    {
+        Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Opaque" }
+
+        SubShader
+        {
+            GrabPass
+            {
+                Tags{ "LightMode" = "Always" }
+            }
+
+            Pass
+            {
+                Tags{ "LightMode" = "Always" }
+
+                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;
+                };
+
+                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;
+                    return o;
+                }
+
+                sampler2D _GrabTexture;
+                float4 _GrabTexture_TexelSize;
+                float _Radius;
+
+                half4 frag(v2f i) : COLOR
+                {
+                    half4 sum = half4(0,0,0,0);
+
+                    #define GRABXYPIXEL(kernelx, kernely) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x + _GrabTexture_TexelSize.x * kernelx, i.uvgrab.y + _GrabTexture_TexelSize.y * kernely, i.uvgrab.z, i.uvgrab.w)))
+
+                    sum += GRABXYPIXEL(0.0, 0.0);
+                    int measurments = 1;
+
+                    for (float range = 0.1f; range <= _Radius; range += 0.1f)
+                    {
+                        sum += GRABXYPIXEL(range, range);
+                        sum += GRABXYPIXEL(range, -range);
+                        sum += GRABXYPIXEL(-range, range);
+                        sum += GRABXYPIXEL(-range, -range);
+                        measurments += 4;
+                    }
+
+                    return sum / measurments;
+                }
+                ENDCG
+            }
+            GrabPass
+            {
+                Tags{ "LightMode" = "Always" }
+            }
+
+            Pass
+            {
+                Tags{ "LightMode" = "Always" }
+
+                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;
+                };
+
+                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;
+                    return o;
+                }
+
+                sampler2D _GrabTexture;
+                float4 _GrabTexture_TexelSize;
+                float _Radius;
+
+                half4 frag(v2f i) : COLOR
+                {
+
+                    half4 sum = half4(0,0,0,0);
+                    float radius = 1.41421356237 * _Radius;
+
+                    #define GRABXYPIXEL(kernelx, kernely) tex2Dproj( _GrabTexture, UNITY_PROJ_COORD(float4(i.uvgrab.x + _GrabTexture_TexelSize.x * kernelx, i.uvgrab.y + _GrabTexture_TexelSize.y * kernely, i.uvgrab.z, i.uvgrab.w)))
+
+                    sum += GRABXYPIXEL(0.0, 0.0);
+                    int measurments = 1;
+
+                    for (float range = 1.41421356237f; range <= radius * 1.41; range += 1.41421356237f)
+                    {
+                        sum += GRABXYPIXEL(range, 0);
+                        sum += GRABXYPIXEL(-range, 0);
+                        sum += GRABXYPIXEL(0, range);
+                        sum += GRABXYPIXEL(0, -range);
+                        measurments += 4;
+                    }
+
+                    return sum / measurments;
+                }
+                ENDCG
+            }
+        }
+    }
+}

Assets/Scripts/Shaders/SimpleGrabPassBlur.shader.meta

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+fileFormatVersion: 2
+guid: 9d87777e2ffaa1049ad4cbeef5b44173
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: