UnityShader3实现2D描边效果

本文实例为大家分享了unityshader3实现2d描边效果的具体代码，供大家参考，具体内容如下

1.

shader "custom/edge"
{
 properties
 {
 _maintex ("texture", 2d) = "white" {}
 _offsetuv ("offsetuv", range(0, 1)) = 0.1
 _edgecolor ("edgecolor", color) = (1, 0, 0, 1)
 _alphatreshold ("treshold", range(0, 1)) = 0.5 
 }
 subshader
 {
 tags { "queue" = "transparent" }
 blend srcalpha oneminussrcalpha
 
 pass
 {
  cgprogram
  #pragma vertex vert
  #pragma fragment frag
  #include "unitycg.cginc"
 
  struct appdata
  {
  float4 vertex : position;
  fixed2 uv : texcoord0;
  };
 
  struct v2f
  {  
  float4 vertex : sv_position;
  fixed2 uv[5] : texcoord0;
  };
 
  sampler2d _maintex;
  float4 _maintex_st;
  fixed _offsetuv;
  fixed4 _edgecolor;
  fixed _alphatreshold;
 
  v2f vert (appdata v)
  {
  v2f o;
  o.vertex = mul(unity_matrix_mvp, v.vertex);
  
  o.uv[0] = v.uv; 
        o.uv[1] = v.uv + fixed2(0, _offsetuv); //up 
        o.uv[2] = v.uv + fixed2(-_offsetuv, 0); //left 
        o.uv[3] = v.uv + fixed2(0, -_offsetuv); //bottom 
        o.uv[4] = v.uv + fixed2(_offsetuv, 0); //right 
 
  return o;
  }
  
  fixed4 frag (v2f i) : sv_target
  {
  fixed4 original = tex2d(_maintex, i.uv[0]); 
        fixed alpha = original.a;
 
        fixed p1 = tex2d(_maintex, i.uv[1]).a; 
        fixed p2 = tex2d(_maintex, i.uv[2]).a; 
        fixed p3 = tex2d(_maintex, i.uv[3]).a; 
        fixed p4 = tex2d(_maintex, i.uv[4]).a; 
   
        alpha = p1 + p2 + p3 + p4 + alpha; 
        alpha /= 5; 
 
        if (alpha < _alphatreshold) original.rgb = _edgecolor.rgb; 
    
        return original; 
  }
  endcg
 }
 }
}

2.

shader "custom/edge"
{
 properties
 {
 _edge ("edge", range(0, 0.2)) = 0.043
 _edgecolor ("edgecolor", color) = (1, 1, 1, 1)
 _maintex ("maintex", 2d) = "white" {}
 }
 subshader
 {
 pass
 {
  cgprogram
  #pragma vertex vert
  #pragma fragment frag
  #include "unitycg.cginc"
 
  fixed _edge;
  fixed4 _edgecolor;
  sampler2d _maintex;
 
  struct appdata
  {
  float4 vertex : position;
  fixed2 uv : texcoord0;
  };
 
  struct v2f
  {
  float4 vertex : sv_position;
  float4 objvertex : texcoord0;
  fixed2 uv : texcoord1;
  };
 
  v2f vert (appdata v)
  {
  v2f o;
  o.vertex = mul(unity_matrix_mvp, v.vertex);
  o.objvertex = v.vertex;
  o.uv = v.uv;
 
  return o;
  }
  
  fixed4 frag (v2f i) : sv_target
  { 
  fixed x = i.uv.x;
  fixed y = i.uv.y;
   
  if((x < _edge) || (abs(1 - x) < _edge) || (y < _edge) || (abs(1 - y) < _edge)) 
  {
   return _edgecolor * abs(cos(_time.y));
  }
  else 
  {
   fixed4 color = tex2d(_maintex, i.uv);
   return color;
  }
 
  //return i.objvertex;
  //return fixed4(i.uv, 0, 1);
  }
  endcg
 }
 }
}

3.如下图，左边是一个image，右边是一个plane。

// upgrade note: replaced 'mul(unity_matrix_mvp,*)' with 'unityobjecttoclippos(*)'
 
shader "custom/edge" 
{ 
  properties 
  { 
    _edge ("edge", range(0, 0.2)) = 0.043 
    _edgecolor ("edgecolor", color) = (1, 1, 1, 1) 
 _flowcolor ("flowcolor", color) = (1, 1, 1, 1) 
 _flowspeed ("flowspeed", range(0, 10)) = 3
 _maintex ("maintex", 2d) = "white" {} 
  } 
  subshader 
  { 
 tags { "queue"="transparent" "rendertype"="transparent" "ignoreprojector"="true" } 
 
    pass 
    { 
  zwrite off 
  blend srcalpha oneminussrcalpha 
 
      cgprogram 
      #pragma vertex vert 
      #pragma fragment frag 
      #include "unitycg.cginc" 
 
      fixed _edge; 
      fixed4 _edgecolor; 
  fixed4 _flowcolor;
  float _flowspeed;
  sampler2d _maintex;
 
      struct appdata 
      { 
        float4 vertex : position; 
        fixed2 uv : texcoord0; 
      }; 
 
      struct v2f 
      { 
        float4 vertex : sv_position; 
        fixed2 uv : texcoord1; 
      }; 
 
      v2f vert (appdata v) 
      { 
        v2f o; 
        o.vertex = unityobjecttoclippos(v.vertex);  
        o.uv = v.uv; 
        return o; 
      } 
       
      fixed4 frag (v2f i) : sv_target 
      {   
        fixed x = i.uv.x; 
        fixed y = i.uv.y; 
  
        if((x < _edge) || (abs(1 - x) < _edge) || (y < _edge) || (abs(1 - y) < _edge))  
        { 
   //点旋转公式：
   //假设对图片上任意点(x,y)，绕一个坐标点(rx0,ry0)逆时针旋转a角度后的新的坐标设为(x0,y0)，有公式：
   //x0 = (x - rx0) * cos(a) - (y - ry0) * sin(a) + rx0 ;
   //y0 = (x - rx0) * sin(a) + (y - ry0) * cos(a) + ry0 ;
 
   float a = _time.y * _flowspeed; 
   float2 rotuv;
 
   x -= 0.5;
   y -= 0.5;
   rotuv.x = x * cos(a) - y * sin(a) + 0.5;
   rotuv.y = x * sin(a) + y * cos(a) + 0.5;
   
   fixed temp = saturate(rotuv.x - 0.5);//-0.5作用是调整流动颜色的比例
          return _edgecolor * (1 - temp) + _flowcolor * temp;
        } 
        else  
        { 
          //fixed4 color = tex2d(_maintex, i.uv); 
          return fixed4(1, 1, 1, 0); 
        }  
      } 
      endcg 
    } 
  } 
} 

4.通过观察上面的效果图，会发现右边的plane出现了锯齿。而解决锯齿一般的方法就是做模糊处理，模糊处理一般又有贴图处理和代码处理之分，这里使用的是贴图处理。贴图处理需要提供一张边界模糊的贴图。

如上图，左下是内边反锯齿的图，右上是未经处理的图。

// upgrade note: replaced 'mul(unity_matrix_mvp,*)' with 'unityobjecttoclippos(*)' 
 
shader "custom/edge2"  
{  
  properties  
  {  
    _edge ("edge", range(0, 0.2)) = 0.043  
    _edgecolor ("edgecolor", color) = (1, 1, 1, 1)  
    _flowcolor ("flowcolor", color) = (1, 1, 1, 1)  
    _flowspeed ("flowspeed", range(0, 10)) = 3 
    _maintex ("maintex", 2d) = "white" {}  
  }  
  subshader  
  {  
    tags { "queue"="transparent" "rendertype"="transparent" "ignoreprojector"="true" }  
 
    pass  
    {  
      zwrite off  
      blend srcalpha oneminussrcalpha  
 
      cgprogram  
      #pragma vertex vert  
      #pragma fragment frag  
      #include "unitycg.cginc"  
  
      fixed _edge;  
      fixed4 _edgecolor;  
      fixed4 _flowcolor; 
      float _flowspeed; 
      sampler2d _maintex; 
 
      struct appdata  
      {  
        float4 vertex : position;  
        fixed2 uv : texcoord0;  
      };  
  
      struct v2f  
      {  
        float4 vertex : sv_position;  
        fixed2 uv : texcoord1;  
      };  
  
      v2f vert (appdata v)  
      {  
        v2f o;  
        o.vertex = unityobjecttoclippos(v.vertex);   
        o.uv = v.uv;  
        return o;  
      }  
        
      fixed4 frag (v2f i) : sv_target  
      {       
  fixed4 color = tex2d(_maintex, i.uv);
  float alpha = color.a;
 
  fixed x = i.uv.x;  
        fixed y = i.uv.y; 
  float a = _time.y * _flowspeed;  
        float2 rotuv; 
 
        x -= 0.5; 
        y -= 0.5; 
        rotuv.x = x * cos(a) - y * sin(a) + 0.5; 
        rotuv.y = x * sin(a) + y * cos(a) + 0.5; 
           
        fixed temp = saturate(rotuv.x - 0.5);//-0.5作用是调整流动颜色的比例 
  fixed4 finalcolor = _edgecolor * (1 - temp) + _flowcolor * temp;   
 
  finalcolor.a = alpha;
  return finalcolor;  
      }  
      endcg  
    }  
  }  
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。