DD_WAITFORVERTICALBLANKDATA

typedef struct _DD_WAITFORVERTICALBLANKDATA{
    PDD_DIRECTDRAW_GLOBAL        lpDD;
    DWORD                        dwFlags;
    DWORD                        bIsInVB;
    DWORD                        hEvent;
    HRESULT                      ddRVal;
    VOID *                       WaitForVerticalBlank;
} DD_WAITFORVERTICALBLANKDATA;

The DD_WAITFORVERTICALBLANKDATA structure is passed to the DirectDraw hardware interface’s WaitForVerticalBlank object callback.

Members

lpDD

Pointer to the DD_DIRECTDRAW_GLOBAL structure that describes the driver.

dwFlags

Specifies how the driver should handle the vertical blank. This field can be one of the following values:

Value	Meaning
DDWAITVB_I_TESTVB	Driver should simply return the current status of the vertical blank.
DDWAITVB_BLOCKBEGIN	Driver should return from WaitForVerticalBlank only when the vertical blank interval begins.
DDWAITVB_BLOCKEND	Driver should return from WaitForVerticalBlank only when the vertical blank interval ends and display begins.

bIsInVB

Specifies the raster state of the device. A value of TRUE indicates that the device is in a vertical blank; FALSE means that it is not.

hEvent

Handle to the event that the driver should trigger when the specified vertical blank status occurs. This is not currently supported by Windows NT.

ddRVal

Location in which the driver returns a DirectDraw status return code. The status codes are defined in ddraw.h.

WaitForVerticalBlank

Unused by Windows NT.