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The DDHAL_WAITFORVERTICALBLANKDATAstructure contains the vertical blank information. This structure passes the information to the DirectDraw HAL WaitForVerticalBlankcallback function.
typedef struct _DDHAL_WAITFORVERTICALBLANKDATA {
LPDDRAWI_DIRECTDRAW_GBL
lpDD
;
DWORD
dwFlags
;
DWORD
bIsInVB
;
DWORD
hEvent
;
HRESULT
ddRVal
;
LPDDHAL_WAITFORVERTICALBLANK
WaitForVerticalBlank
;
} DDHAL_WAITFORVERTICALBLANKDATA;
Members
- lpDD
- Pointer to the DDRAWI_DIRECTDRAW_GBLstructure that represents the DirectDraw object.
- dwFlags
- Indicates how to wait for the vertical blank.
Flag Usage DDWAITVB_BLOCKBEGIN Return when the vertical blank interval begins. DDWAITVB_BLOCKBEGINEVENT Set up an event to trigger when the vertical blank begins. This flag is not currently supported. DDWAITVB_BLOCKEND Return when the vertical blank interval ends and display begins. DDWAITVB_I_TESTVB DirectDraw sets the flag to query if a vertical blank is in progress. - bIsInVB
- Indicates the status of the vertical blank.
- hEvent
- Handle for the event that should be triggered when the vertical blank begins. The hEventis triggered on an interrupt, so if you have the ability to generate an interrupt on the vertical blank you need to pass this event handle to your ring 0 interrupt handler so it is triggered when the interrupt goes off. This is to trigger some code off when the interrupt on the vertical blank is set.
- ddRVal
- Passes the DirectDraw return values.
- WaitForVerticalBlank
- This member is used by DirectDraw and should not be filled in
by the driver.
Last updated on Tuesday, July 13, 2004