#pragma geometry geom

//The data structure from the application to the vertex shader.
struct a2v  
{  
    float4 vertex : POSITION;  
    float2 uv : TEXCOORD0;  
};  

//The data structure from the vertex shader to the geometry shader.
struct v2g  
{  
    float4 vertex : POSITION;  
    float2 uv : TEXCOORD0;  
};

//The data structure from the geometry shader to the fragment shader.
struct g2f
{  
    float4 vertex : SV_POSITION;  
    float2 uv : TEXCOORD0;
};  

  [maxvertexcount(3)]  
  void geom(triangle v2g input[3], inout TriangleStream<g2f> outStream)  
  {  
        g2f o;  

        for(int i = 0; i < 3; i++)  
        {  
              o.vertex = UnityObjectToClipPos(input[i].vertex);  
              o.uv = input[i].uv;  
              outStream.Append(o);  
        }  
  
        outStream.RestartStrip();  
  }