message: Handle formatting double signature parameters
diff: @@ -853,6 +853,8 @@ QString TypeString(const SigParameter &sig)
  ret += lit("snorm float");
  else if(sig.compType == CompType::Depth)
  ret += lit("float");
  + else if(sig.compType == CompType::Double)
  + ret += lit("double");
  if(sig.compCount > 1)
  ret += QString::number(sig.compCount);
  