struct VSOut                                                                                   
{                                                                                              
   float4 position : SV_POSITION;                                                              
   float2 texcoord : TEXCOORD;                                                                 
};                                                                                             
                                                                                               
VSOut VS( VSIn vertex )                                                                        
{                                                                                              
   VSOut output;                                                                               
                                                                                               
   output.position = vertex.position;                                                          
   output.texcoord = vertex.texcoord;                                                          
                                                                                               
   return output;                                                                              
}