Unity2D Sprite 描边Shader(unity描边shader)

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自制的第一个shader，比较简单所以直接贴源码。

是用官方的Sprite shader稍作加工完成的。

核心就是这一部分

fixed4 o = tex2D(_MainTex, IN.texcoord &#; float2(_OutLineSpread, 0.0)) &#; tex2D(_MainTex, IN.texcoord - float2(0.0, _OutLineSpread));o = o &#; tex2D(_MainTex, IN.texcoord &#; float2(0.0, _OutLineSpread)) &#; tex2D(_MainTex, IN.texcoord - float2(_OutLineSpread, 0.0));o = IN.color;fixed4 main = tex2D(_MainTex, IN.texcoord);if (main.a > 0.1){o = main;}return o;

美中不足的是，描边范围必须要在sprite图片的范围之内。所以需要在一定程度上留白。

以下是全部源码

Shader "Sprites/Default"{Properties{[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}_Color ("Tint", Color) = (1,1,1,1)[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0_OutLineSpread ("Outline Spread", Range(0,0.)) = 0. _Color("Outline Color", Color) = (1.0,1.0,1.0,1.0)}SubShader{Tags{ "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane""CanUseSpriteAtlas"="True"}Cull OffLighting OffZWrite OffFog { Mode Off }Blend SrcAlpha OneMinusSrcAlphaPass{CGPROGRAM#pragma vertex vert #pragma fragment frag#pragma multi_compile DUMMY PIXELSNAP_ON#include "UnityCG.cginc"struct appdata_t{float4 vertex : POSITION;float4 color : COLOR;float2 texcoord : TEXCOORD0;};struct v2f{float4 vertex : SV_POSITION;fixed4 color : COLOR;half2 texcoord : TEXCOORD0;};fixed4 _Color;v2f vert(appdata_t IN){v2f OUT;OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);OUT.texcoord = IN.texcoord;OUT.color = IN.color * _Color;#ifdef PIXELSNAP_ONOUT.vertex = UnityPixelSnap (OUT.vertex);#endifreturn OUT;}sampler2D _MainTex;float _OutLineSpread;fixed4 frag(v2f IN) : COLOR{fixed4 o = tex2D(_MainTex, IN.texcoord &#; float2(_OutLineSpread, 0.0)) &#; tex2D(_MainTex, IN.texcoord - float2(0.0, _OutLineSpread));o = o &#; tex2D(_MainTex, IN.texcoord &#; float2(0.0, _OutLineSpread)) &#; tex2D(_MainTex, IN.texcoord - float2(_OutLineSpread, 0.0));o = IN.color;fixed4 main = tex2D(_MainTex, IN.texcoord);if (main.a > 0.1){o = main;}return o;}ENDCG}}}

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