Shader "GUI/EllipseMask"
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{
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Properties
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{
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[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
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_Color ("Tint", Color) = (1,1,1,1)
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[Header(Ellipse Settings)]
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_EllipseCenter ("Ellipse Center", Vector) = (0.5, 0.5, 0, 0)
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_EllipseRadius ("Ellipse Radius", Vector) = (0.5, 0.5, 0, 0)
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_Softness ("Softness", Range(0, 0.5)) = 0.1
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[Header(Stencil Settings)]
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_StencilComp ("Stencil Comparison", Float) = 8
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_Stencil ("Stencil ID", Float) = 1
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_StencilOp ("Stencil Operation", Float) = 0
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_StencilWriteMask ("Stencil Write Mask", Float) = 255
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_StencilReadMask ("Stencil Read Mask", Float) = 255
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_ColorMask ("Color Mask", Float) = 15
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}
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SubShader
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{
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Tags
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{
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"Queue" = "Transparent"
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"IgnoreProjector" = "True"
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"RenderType" = "Transparent"
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"PreviewType" = "Plane"
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"CanUseSpriteAtlas" = "True"
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}
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// 椭圆形遮罩写入Pass
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Pass
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{
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Name "Ellipse Mask Write"
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Stencil
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{
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Ref [_Stencil]
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Comp Always
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Pass Replace
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ReadMask [_StencilReadMask]
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WriteMask [_StencilWriteMask]
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}
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ColorMask 0 // 不写入颜色，只写入模板
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ZWrite Off
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Cull Off
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Blend Off
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata_t
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{
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float4 vertex : POSITION;
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float2 texcoord : TEXCOORD0;
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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float2 texcoord : TEXCOORD0;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float4 _EllipseCenter;
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float4 _EllipseRadius;
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float _Softness;
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v2f vert(appdata_t v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
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return o;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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// 计算到椭圆中心的距离（归一化坐标）
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float2 center = _EllipseCenter.xy;
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float2 radius = _EllipseRadius.xy;
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// 椭圆方程：(x-center.x)^2/radius.x^2 + (y-center.y)^2/radius.y^2 <= 1
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float2 pos = i.texcoord;
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float dx = (pos.x - center.x) / radius.x;
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float dy = (pos.y - center.y) / radius.y;
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float ellipseValue = dx * dx + dy * dy;
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// 软边缘处理 - 调整椭圆边界
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float adjustedEllipseValue = ellipseValue;
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if (_Softness > 0)
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{
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// 使用smoothstep创建软边缘过渡
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adjustedEllipseValue = smoothstep(1.0 - _Softness, 1.0 + _Softness, ellipseValue);
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}
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// 如果不在椭圆内，则丢弃像素
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clip(1.0 - adjustedEllipseValue - 0.01);
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return fixed4(0, 0, 0, 0);
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}
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ENDCG
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}
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// 正常渲染Pass - 只在模板匹配的区域渲染
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Pass
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{
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Name "Masked Content"
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Stencil
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{
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Ref [_Stencil]
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Comp Equal
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Pass Keep
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ReadMask [_StencilReadMask]
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WriteMask [_StencilWriteMask]
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}
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Blend SrcAlpha OneMinusSrcAlpha
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ColorMask [_ColorMask]
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ZWrite Off
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Cull Off
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata_t
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{
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float4 vertex : POSITION;
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float4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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fixed4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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fixed4 _Color;
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v2f vert(appdata_t v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
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o.color = v.color * _Color;
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return o;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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fixed4 color = tex2D(_MainTex, i.texcoord) * i.color;
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// 遮罩本身不显示颜色，只用于模板测试
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color.a = 0;
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return color;
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}
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ENDCG
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}
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}
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}
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