The D3DVAL macro creates a value whose type is D3DVALUE.
D3DVAL(val)    ((float)val) 
 The macros returns the converted value.
  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in d3dtypes.h.