Driver capability flag.
Microsoft Windows Hardware Quality Labs (WHQL) driver testing. This is a time-consuming test requiring a one-second or two-second time penalty. This constant is used by the WHQLLevel member of D3DADAPTER_IDENTIFIER9.
Differences between Direct3D 9 and Direct3D 9Ex:D3DENUM_WHQL_LEVEL is deprecated for Direct3D9Ex running on Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 (or more current operating system). Any of these operating systems return 1 for the WHQL level without checking the status of the driver.
|Minimum operating system||Windows 98|