struct FragmentOut { float4 color0:COLOR0; };

FragmentOut add( in float2 myTexCoord:WPOS, uniform samplerRECT x, uniform samplerRECT y )
{   
    FragmentOut c;
    c.color0 = texRECT( x, myTexCoord ) + texRECT( y, myTexCoord );
    return c;
}