Unity切圆角矩形

最新推荐文章于 2025-11-23 09:07:59 发布

转载最新推荐文章于 2025-11-23 09:07:59 发布 · 1.8k 阅读

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#圆角 #shader

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本文介绍了一个 Unity Shader 示例，用于实现带有圆角效果的 UI 元素。该 Shader 通过设置不同的属性来控制圆角大小，并使用了 Unity 的 UI 渲染管线。文章详细展示了如何在 Shader 中进行条件判断以实现圆角效果。

转载地址：http://www.manew.com/blog-48527-3473.html

Shader "Custom/yuanjiao" {
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
	_Color("Tint", Color) = (1,1,1,1)

		_StencilComp("Stencil Comparison", Float) = 8
		_Stencil("Stencil ID", Float) = 0
		_StencilOp("Stencil Operation", Float) = 0
		_StencilWriteMask("Stencil Write Mask", Float) = 255
		_StencilReadMask("Stencil Read Mask", Float) = 255

		_ColorMask("Color Mask", Float) = 15

		[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0

		_RoundedRadius("Rounded Radius", Range(0, 256)) = 64
	}

		SubShader
	{
		Tags
	{
		"Queue" = "Transparent"
		"IgnoreProjector" = "True"
		"RenderType" = "Transparent"
		"PreviewType" = "Plane"
		"CanUseSpriteAtlas" = "True"
	}

		Stencil
	{
		Ref[_Stencil]
		Comp[_StencilComp]
		Pass[_StencilOp]
		ReadMask[_StencilReadMask]
		WriteMask[_StencilWriteMask]
	}

		Cull Off
		Lighting Off
		ZWrite Off
		ZTest[unity_GUIZTestMode]
		Blend SrcAlpha OneMinusSrcAlpha
		ColorMask[_ColorMask]

		Pass
	{
		CGPROGRAM
#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"
#include "UnityUI.cginc"

#pragma multi_compile __ UNITY_UI_ALPHACLIP

		struct appdata_t
	{
		float4 vertex   :
		POSITION;
		float4 color    :
		COLOR;
		float2 texcoord :
		TEXCOORD0;
	};

	struct v2f
	{
		float4 vertex   :
		SV_POSITION;
		fixed4 color :
		COLOR;
		half2 texcoord  :
		TEXCOORD0;
		float4 worldPosition :
		TEXCOORD1;
	};

	fixed4 _Color;
	fixed4 _TextureSampleAdd;
	float4 _ClipRect;

	float _RoundedRadius;

	float4 _MainTex_TexelSize;

	v2f vert(appdata_t IN)
	{
		v2f OUT;
		OUT.worldPosition = IN.vertex;
		OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

		OUT.texcoord = IN.texcoord;

#ifdef UNITY_HALF_TEXEL_OFFSET
		OUT.vertex.xy += (_ScreenParams.zw - 1.0)*float2(-1,1);
#endif

		OUT.color = IN.color * _Color;
		return OUT;
	}

	sampler2D _MainTex;

	fixed4 frag(v2f IN) : SV_Target
	{
		half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;

		color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);

#ifdef UNITY_UI_ALPHACLIP
		clip(color.a - 0.001);
#endif

		float width = _MainTex_TexelSize.z;
		float height = _MainTex_TexelSize.w;

		float x = IN.texcoord.x * width;
		float y = IN.texcoord.y * height;

		float r = _RoundedRadius;

		//左下角
		if (x < r && y < r)
		{
			if ((x - r) * (x - r) + (y - r) * (y - r) > r * r)
				color.a = 0;
		}

		//左上角
		if (x < r && y >(height - r))
		{
			if ((x - r) * (x - r) + (y - (height - r)) * (y - (height - r)) > r * r)
				color.a = 0;
		}

		//右下角
		if (x > (width - r) && y < r)
		{
			if ((x - (width - r)) * (x - (width - r)) + (y - r) * (y - r) > r * r)
				color.a = 0;
		}

		//右上角
		if (x > (width - r) && y > (height - r))
		{
			if ((x - (width - r)) * (x - (width - r)) + (y - (height - r)) * (y - (height - r)) > r * r)
				color.a = 0;
		}

		return color;
	}
		ENDCG
	}
	}
}