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D3DDDI_LOCKASYNCFLAGS structure

The D3DDDI_LOCKASYNCFLAGS structure identifies how to lock a resource.

Syntax


typedef struct _D3DDDI_LOCKASYNCFLAGS {
  union {
    struct {
      UINT NoOverwrite  :1;
      UINT Discard  :1;
      UINT RangeValid  :1;
      UINT AreaValid  :1;
      UINT BoxValid  :1;
      UINT NoExistingReferences  :1;
      UINT NotifyOnly  :1;
      UINT Reserved  :25;
    };
    UINT   Value;
  };
} D3DDDI_LOCKASYNCFLAGS;

Members

NoOverwrite

A UINT value that specifies whether the locked resource can have data appended to it but the existing data in the resource cannot be modified. This member is used only with Microsoft Direct3D vertex buffer locks.

Setting this member is equivalent to setting the first bit of the 32-bit Value member (0x00000001).

Discard

A UINT value that specifies whether the entire locked resource is modified. If this value is set, because the existing contents can be discarded, the contents require no preliminary processing.

Setting this member is equivalent to setting the second bit of the 32-bit Value member (0x00000002).

RangeValid

A UINT value that specifies whether the locked resource is linear.

Setting this member is equivalent to setting the third bit of the 32-bit Value member (0x00000004).

AreaValid

A UINT value that specifies whether the locked resource is a surface.

Setting this member is equivalent to setting the fourth bit of the 32-bit Value member (0x00000008).

BoxValid

A UINT value that specifies whether the locked resource is a volume.

Setting this member is equivalent to setting the fifth bit of the 32-bit Value member (0x00000010).

NoExistingReferences

A UINT value that specifies whether the Microsoft Direct3D runtime has any queued references to the resource to be locked. If NoExistingReferences is set, the driver determines that no internally queued references to the resource are available. The driver can then set the NoExistingReferences bit-field flag of the D3DDDICB_LOCK structure when the driver calls the pfnLockCb function to perform a lock-discard operation.

Setting this member is equivalent to setting the sixth bit of the 32-bit Value member (0x00000020).

NotifyOnly

A UINT value that specifies whether the lock call is for notification only. The Direct3D runtime sets NotifyOnly to TRUE when it locks runtime-allocated system memory surfaces. In this situation, the runtime ignores the pointer that the driver returns in the pSurfData member of the D3DDDIARG_LOCKASYNC structure.

Setting this member is equivalent to setting the seventh bit of the 32-bit Value member (0x00000040).

Reserved

This member is reserved and should be set to zero. Setting this member to zero is equivalent to setting the remaining 25 bits (0xFFFFFF80) of the 32-bit Value member to zeros.

Value

A member in the union that is contained in D3DDDI_LOCKASYNCFLAGS that can hold one 32-bit value that identifies how to lock a resource.

Requirements

Version

Available in Windows Vista and later versions of the Windows operating systems.

Header

D3dumddi.h (include D3dumddi.h)

See also

D3DDDIARG_LOCKASYNC

 

 

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