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Assets/Resources/Circle/ImageWithIndependentRoundedCorners.cs

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+using System;
+using UnityEngine;
+using UnityEngine.UI;
+
+[ExecuteInEditMode]
+public class ImageWithIndependentRoundedCorners : MonoBehaviour {
+	
+	public Vector4 r;
+	private Material material;
+	
+	// xy - position,
+	// zw - halfSize
+	[HideInInspector, SerializeField] private Vector4 rect2props;
+
+	private readonly int prop_halfSize = Shader.PropertyToID("_halfSize");
+	private readonly int prop_radiuses = Shader.PropertyToID("_r");
+	private readonly int prop_rect2props = Shader.PropertyToID("_rect2props");
+	
+	// Vector2.right rotated clockwise by 45 degrees
+	private static readonly Vector2 wNorm = new Vector2(.7071068f, -.7071068f);
+	// Vector2.right rotated counter-clockwise by 45 degrees
+	private static readonly Vector2 hNorm = new Vector2(.7071068f, .7071068f);
+
+    private void Start()
+    {
+		Refresh();
+    }
+    void OnRectTransformDimensionsChange(){
+		Refresh();
+	}
+	
+	private void OnValidate(){
+		Refresh();
+	}
+	
+	private void RecalculateProps(Vector2 size){
+
+		// Vector that goes from left to right sides of rect2
+		var aVec = new Vector2(size.x, -size.y + r.x + r.z);
+
+		// Project vector aVec to wNorm to get magnitude of rect2 width vector
+		var halfWidth = Vector2.Dot(aVec, wNorm) * .5f;
+		rect2props.z = halfWidth;
+		
+		
+		// Vector that goes from bottom to top sides of rect2
+		var bVec = new Vector2(size.x, size.y - r.w - r.y);
+		
+		// Project vector bVec to hNorm to get magnitude of rect2 height vector
+		var halfHeight = Vector2.Dot(bVec, hNorm) * .5f;
+		rect2props.w = halfHeight;
+		
+		
+		// Vector that goes from left to top sides of rect2
+		var efVec = new Vector2(size.x - r.x - r.y, 0);
+		// Vector that goes from point E to point G, which is top-left of rect2
+		var egVec = hNorm * Vector2.Dot(efVec, hNorm);
+		// Position of point E relative to center of coord system
+		var ePoint = new Vector2(r.x - (size.x / 2), size.y / 2);
+		// Origin of rect2 relative to center of coord system
+		// ePoint + egVec == vector to top-left corner of rect2
+		// wNorm * halfWidth + hNorm * -halfHeight == vector from top-left corner to center
+		var origin = ePoint + egVec + wNorm * halfWidth + hNorm * -halfHeight;
+		rect2props.x = origin.x;
+		rect2props.y = origin.y;
+	}
+
+	private void Refresh(){
+		if (material == null)
+		{
+			material = Instantiate(Resources.Load<Material>("UI/Material/IndependentCornersMaterial"));
+		}
+		var rect = ((RectTransform) transform).rect;
+		RecalculateProps(rect.size);
+		material.SetVector(prop_rect2props, rect2props);
+		material.SetVector(prop_halfSize, rect.size * .5f);
+		material.SetVector(prop_radiuses, r);
+		if (gameObject.GetComponent<Image>() != null)
+		{
+			gameObject.GetComponent<Image>().material = material;
+			gameObject.GetComponent<Image>().sprite = null;
+		}
+		else if (gameObject.GetComponent<RawImage>() != null)
+		{
+			gameObject.GetComponent<RawImage>().material = material;
+		}
+	}
+
+}

Assets/Resources/Circle/ImageWithIndependentRoundedCorners.cs.meta

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+fileFormatVersion: 2
+guid: 109c41f08973846429af681aea0a30c4
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Resources/Circle/IndependentRoundedCorners.shader

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+Shader "UI/RoundedCorners/IndependentRoundedCorners" {
+    
+    Properties {
+        [HideInInspector] _MainTex ("Texture", 2D) = "white" {}
+        
+        // --- Mask support ---
+        [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", Float) = 15
+        [HideInInspector] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
+        // Definition in Properties section is required to Mask works properly
+        _r ("r", Vector) = (0,0,0,0)
+        _halfSize ("halfSize", Vector) = (0,0,0,0)
+        _rect2props ("rect2props", Vector) = (0,0,0,0)
+        // ---
+    }
+    
+    SubShader {
+        Tags { 
+            "RenderType"="Transparent"
+            "Queue"="Transparent" 
+        }
+        
+        // --- Mask support ---
+        Stencil {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }    
+        Cull Off
+        Lighting Off
+        ZTest [unity_GUIZTestMode]
+        ColorMask [_ColorMask]
+        // ---
+        
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+
+        Pass {
+            CGPROGRAM
+            
+            #include "UnityCG.cginc"
+            #include "SDFUtils.cginc"
+            #include "ShaderSetup.cginc"
+            
+            #pragma vertex vert
+            #pragma fragment frag
+            
+            float4 _r;
+            float4 _halfSize;
+            float4 _rect2props;
+            sampler2D _MainTex;
+            
+            fixed4 frag (v2f i) : SV_Target {
+                float alpha = CalcAlphaForIndependentCorners(i.uv, _halfSize.xy, _rect2props, _r);
+                return mixAlpha(tex2D(_MainTex, i.uv), i.color, alpha);
+            }
+            
+            ENDCG
+        }
+    }
+}

Assets/Resources/Circle/IndependentRoundedCorners.shader.meta

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+fileFormatVersion: 2
+guid: d3beb88e61f88ca4393acdefb005fa70
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: