72 lines
1.5 KiB
Plaintext
72 lines
1.5 KiB
Plaintext
Shader "Custom/UI/RoundRect"
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{
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Properties
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{
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[PerRendererData]
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_MainTex("Main Texture", 2D) = "white" {}
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[PerRendererData]
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_Color("Main Color", Color) = (1,1,1,1)
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_Radius("Radius", Range(0,0.5)) = 0
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}
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SubShader
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{
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Tags { "Queue" = "Transparent" }
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LOD 200
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pass {
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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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sampler2D _MainTex;
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fixed _Radius;
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fixed4 _Color;
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struct v2f {
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float4 pos:SV_POSITION;
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float2 srcUV:TEXCOORD0; // 原本的uv
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float2 adaptUV:TEXCOORD1; // 用来调整方便计算的uv
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};
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v2f vert(appdata_base v) {
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.srcUV = v.texcoord;
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// 调整uv范围从(0,1)到(-0.5,0.5)，即图片uv原点从左下角到中心点
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o.adaptUV = o.srcUV - fixed2(0.5,0.5);
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return o;
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}
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fixed4 frag(v2f i) :COLOR
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{
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fixed4 col = fixed4(0,0,0,0);
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// 首先绘制中间部分（在设置圆角半径里面的）(adaptUV x y 绝对值小于 0.5-圆角半径内的区域)
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if (abs(i.adaptUV).x < (0.5 - _Radius) || abs(i.adaptUV).y < (0.5 - _Radius))
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{
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col = tex2D(_MainTex,i.srcUV);
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}
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else
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{
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// 其次四个圆角部分（相当于以 （0.5-圆角半径，0.5-圆角半径）为圆心，把 uv 在 圆角半径内的uv绘制出来）
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if (length(abs(i.adaptUV) - fixed2(0.5 - _Radius,0.5 - _Radius)) < _Radius) {
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col = tex2D(_MainTex,i.srcUV);
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}
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else// 超出的部分忽略掉
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{
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discard;
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}
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}
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return col * _Color;
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}
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ENDCG
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}
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}
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FallBack "Diffuse"
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}
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