102 lines
3.0 KiB
Plaintext
102 lines
3.0 KiB
Plaintext
Shader "UI/RoundedRectangle"
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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, 2.5)) = 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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Cull 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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float2 size : TEXCOORD1; // 传递 UI 组件的宽高
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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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// 计算 UI 组件的实际宽高
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float2 size = float2(
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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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);
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o.size = size; // 传递宽高信息
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return o;
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}
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// 计算 SDF 圆角边界
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float roundedBoxSDF(float2 uv, float2 size, float radius)
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{
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// 归一化 UV 到 [-1,1]，保持正确比例
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uv = (uv - 0.5) * 2.0;
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uv *= size / min(size.x, size.y); // 保持等比例缩放
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// 计算边界
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float2 corner = float2(1.0 - radius, 1.0 - radius);
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float2 d = abs(uv) - corner;
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return length(max(d, 0.0)) + min(max(d.x, d.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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float radius = UNITY_ACCESS_INSTANCED_PROP(Props, _Radius) * min(i.size.x, i.size.y) * 0.5;
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// 计算 SDF 圆角
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float sdf = roundedBoxSDF(i.uv, i.size, radius);
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// 抗锯齿处理
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float alpha = 1.0 - smoothstep(0.0, 0.01 * min(i.size.x, i.size.y), 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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}
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