DD_WAITFORVPORTSYNCDATA structure (ddrawint.h)
The DD_WAITFORVPORTSYNCDATA structure contains the information required for the driver to synchronize the video port extensions (VPE) object.
Syntax
typedef struct _DD_WAITFORVPORTSYNCDATA {
PDD_DIRECTDRAW_LOCAL lpDD;
PDD_VIDEOPORT_LOCAL lpVideoPort;
DWORD dwFlags;
DWORD dwLine;
DWORD dwTimeOut;
HRESULT ddRVal;
VOID *UpdateVideoPort;
} *PDD_WAITFORVPORTSYNCDATA, DD_WAITFORVPORTSYNCDATA;
Members
lpDD
Points to a DD_DIRECTDRAW_LOCAL structure that is relevant to the current Microsoft DirectDraw process only.
lpVideoPort
Points to a DD_VIDEOPORT_LOCAL structure that represents this VPE object.
dwFlags
Indicates the condition for which the driver should wait. This member can be one of the following values:
Flag | Meaning |
---|---|
DDVPWAIT_BEGIN | The driver should return at the beginning of the next V-sync. |
DDVPWAIT_END | The driver should return at the end of the next/current V-sync. |
DDVPWAIT_LINE | The driver should return at the beginning of the line specified in dwLine. |
dwLine
Specifies the line number on which the driver should synchronize when dwFlags is DDVPWAIT_LINE. The driver should ignore this member when dwFlags is set to DDVPWAIT_BEGIN or DDVPWAIT_END.
dwTimeOut
Specifies the maximum amount of time the driver should wait, in milliseconds, before timing out.
ddRVal
Specifies the location in which the driver writes the return value of the DdVideoPortWaitForSync callback. A return code of DD_OK indicates success. For more information, see Return Values for DirectDraw.
UpdateVideoPort
Used by the DirectDraw API and should not be filled in by the driver.
Requirements
Requirement | Value |
---|---|
Header | ddrawint.h (include Winddi.h) |