UI HUGE UPDATE

Assets/Shaders/UI/UIShadow.shader

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+Shader "UI/Soft Shadow"
+{
+    Properties
+    {
+        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+        _Color ("Tint", Color) = (1,1,1,1)
+
+        _ShadowColor ("Shadow Color", Color) = (0,0,0,0.65)
+        _ShadowOffset ("Shadow Offset (Pixels)", Vector) = (6,-6,0,0)
+        _ShadowBlur ("Shadow Blur", Range(0,8)) = 2
+        _ShadowStrength ("Shadow Strength", Range(0,2)) = 1
+        _InsetPadding ("Extra Safe Inset", Range(0,0.25)) = 0.02
+
+        _StencilComp ("Stencil Comparison", Float) = 8
+        _Stencil ("Stencil ID", Float) = 0
+        _StencilOp ("Stencil Operation", Float) = 0
+        _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        _StencilReadMask ("Stencil Read Mask", Float) = 255
+        _ColorMask ("Color Mask", Float) = 15
+        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            "Queue"="Transparent"
+            "IgnoreProjector"="True"
+            "RenderType"="Transparent"
+            "PreviewType"="Plane"
+            "CanUseSpriteAtlas"="True"
+        }
+
+        Stencil
+        {
+            Ref [_Stencil]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+        }
+
+        Cull Off
+        Lighting Off
+        ZWrite Off
+        ZTest [unity_GUIZTestMode]
+        Blend One OneMinusSrcAlpha
+        ColorMask [_ColorMask]
+
+        Pass
+        {
+            Name "Default"
+
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #pragma target 2.0
+
+            #include "UnityCG.cginc"
+            #include "UnityUI.cginc"
+
+            #pragma multi_compile_local _ UNITY_UI_CLIP_RECT
+            #pragma multi_compile_local _ UNITY_UI_ALPHACLIP
+
+            struct appdata_t
+            {
+                float4 vertex   : POSITION;
+                float4 color    : COLOR;
+                float2 texcoord : TEXCOORD0;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct v2f
+            {
+                float4 vertex        : SV_POSITION;
+                fixed4 color         : COLOR;
+                float2 texcoord      : TEXCOORD0;
+                float4 worldPosition : TEXCOORD1;
+                UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+            sampler2D _MainTex;
+            float4 _MainTex_TexelSize;
+            fixed4 _Color;
+            fixed4 _TextureSampleAdd;
+            float4 _ClipRect;
+
+            fixed4 _ShadowColor;
+            float4 _ShadowOffset;
+            float _ShadowBlur;
+            float _ShadowStrength;
+            float _InsetPadding;
+
+            v2f vert(appdata_t IN)
+            {
+                v2f OUT;
+                UNITY_SETUP_INSTANCE_ID(IN);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
+
+                OUT.worldPosition = IN.vertex;
+                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
+                OUT.texcoord = IN.texcoord;
+                OUT.color = IN.color * _Color;
+                return OUT;
+            }
+
+            float2 GetContentPad()
+            {
+                float2 autoPad = abs(_ShadowOffset.xy) * _MainTex_TexelSize.xy;
+                autoPad += (_MainTex_TexelSize.xy * _ShadowBlur * 2.5);
+                autoPad += _InsetPadding.xx;
+                return clamp(autoPad, 0.0, 0.45);
+            }
+
+            float2 RemapUvToContent(float2 uv, float2 pad)
+            {
+                float2 denom = max(1e-5.xx, 1.0.xx - pad * 2.0);
+                return (uv - pad) / denom;
+            }
+
+            fixed4 SampleSprite(float2 uv, fixed4 tint)
+            {
+                float inside = step(0.0, uv.x) * step(0.0, uv.y) * step(uv.x, 1.0) * step(uv.y, 1.0);
+                if (inside < 0.5)
+                {
+                    return 0;
+                }
+
+                fixed4 c = (tex2D(_MainTex, uv) + _TextureSampleAdd) * tint;
+                c.rgb *= c.a;
+                return c;
+            }
+
+            float SampleShadowAlpha(float2 uv, fixed alphaTint)
+            {
+                float2 offsetUv = uv + (_MainTex_TexelSize.xy * _ShadowOffset.xy);
+                float2 blurUv = _MainTex_TexelSize.xy * _ShadowBlur;
+
+                float a = 0.0;
+                a += tex2D(_MainTex, offsetUv).a * 0.22702703;
+                a += tex2D(_MainTex, offsetUv + float2( blurUv.x, 0)).a * 0.19459459;
+                a += tex2D(_MainTex, offsetUv + float2(-blurUv.x, 0)).a * 0.19459459;
+                a += tex2D(_MainTex, offsetUv + float2(0,  blurUv.y)).a * 0.19459459;
+                a += tex2D(_MainTex, offsetUv + float2(0, -blurUv.y)).a * 0.19459459;
+                a += tex2D(_MainTex, offsetUv + float2( blurUv.x,  blurUv.y)).a * 0.12162162;
+                a += tex2D(_MainTex, offsetUv + float2(-blurUv.x,  blurUv.y)).a * 0.12162162;
+                a += tex2D(_MainTex, offsetUv + float2( blurUv.x, -blurUv.y)).a * 0.12162162;
+                a += tex2D(_MainTex, offsetUv + float2(-blurUv.x, -blurUv.y)).a * 0.12162162;
+
+                return saturate(a * alphaTint * _ShadowStrength);
+            }
+
+            fixed4 frag(v2f IN) : SV_Target
+            {
+                float2 pad = GetContentPad();
+                float2 contentUv = RemapUvToContent(IN.texcoord, pad);
+
+                fixed4 src = SampleSprite(contentUv, IN.color);
+
+                float shadowAlpha = SampleShadowAlpha(contentUv, IN.color.a) * _ShadowColor.a;
+                fixed3 shadowRgb = _ShadowColor.rgb * shadowAlpha;
+
+                fixed4 col;
+                col.a = src.a + shadowAlpha * (1.0 - src.a);
+                col.rgb = src.rgb + shadowRgb * (1.0 - src.a);
+
+                #ifdef UNITY_UI_CLIP_RECT
+                col *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+                #endif
+
+                #ifdef UNITY_UI_ALPHACLIP
+                clip(col.a - 0.001);
+                #endif
+
+                return col;
+            }
+            ENDHLSL
+        }
+    }
+}

Assets/Shaders/UI/UIShadow.shader.meta

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+fileFormatVersion: 2
+guid: 4627f9f3a5ab4c6f8c0b1d2e3f4a5b6c
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: