107 lines
3.1 KiB
Plaintext
107 lines
3.1 KiB
Plaintext
Shader "UI/RoundedCorner"
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{
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Properties
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{
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_Color("Color", Color) = (1,1,1,1)
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_Radius("Corner Radius", Range(0, 5)) = 0.1
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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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"RenderType" = "Transparent"
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"PreviewType" = "Plane"
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}
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile_instancing
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct v2f
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{
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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float4 rectSize : TEXCOORD1;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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UNITY_INSTANCING_BUFFER_START(Props)
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UNITY_DEFINE_INSTANCED_PROP(fixed4, _Color)
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UNITY_DEFINE_INSTANCED_PROP(half, _Radius)
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UNITY_INSTANCING_BUFFER_END(Props)
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v2f vert(appdata v)
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{
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v2f o;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_TRANSFER_INSTANCE_ID(v, o);
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv;
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// 获取实际矩形尺寸
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float4 rectParams = float4(
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length(float3(unity_ObjectToWorld[0].x, unity_ObjectToWorld[1].x, unity_ObjectToWorld[2].x)),
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length(float3(unity_ObjectToWorld[0].y, unity_ObjectToWorld[1].y, unity_ObjectToWorld[2].y)),
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0, 0
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);
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o.rectSize = rectParams;
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return o;
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}
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// 圆形圆角SDF函数
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float roundedBoxSDF(float2 uv, float2 size, float radius)
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{
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// 计算宽高比
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float aspect = size.x / size.y;
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uv.x *= aspect; // 标准化为正方形坐标系
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float2 cornerSize = float2(1.0 - radius, 1.0 - radius);
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float2 q = abs(uv) - cornerSize;
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return length(max(q, 0.0)) + min(max(q.x, q.y), 0.0) - radius;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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UNITY_SETUP_INSTANCE_ID(i);
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float2 size = i.rectSize.xy; // 直接使用 UI 元素的宽高
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float maxRadius = min(size.x, size.y) * 0.5;
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float radius = UNITY_ACCESS_INSTANCED_PROP(Props, _Radius) * maxRadius;
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// 计算 UV 并修正长宽比
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float2 uv = (i.uv - 0.5) * 2.0;
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uv *= size / min(size.x, size.y); // 确保 uv 坐标缩放一致，避免变形
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// 计算 SDF
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float sdf = roundedBoxSDF(uv, float2(1.0, 1.0), radius);
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float alpha = 1.0 - smoothstep(0.0, 0.02 * maxRadius, sdf);
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fixed4 color = UNITY_ACCESS_INSTANCED_PROP(Props, _Color);
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return fixed4(color.rgb, alpha * color.a);
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}
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ENDCG
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}
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}
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} |