// input vertex
struct VertIn
{
  float4 pos   : POSITION;
  float4 color : COLOR0;
};
 
// output vertex
struct VertOut
{
  float4 pos   : POSITION;
  float4 color : COLOR0;
};
 
// vertex shader main entry
VertOut main(VertIn IN)
{
  VertOut OUT;
  OUT.pos     = IN.pos;
  OUT.color   = IN.color;
  OUT.color.z = 1.0f;
  return OUT;
}