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D3DDDI_LOCKFLAGS structure

The D3DDDI_LOCKFLAGS structure identifies how to lock a resource.

Syntax


typedef struct _D3DDDI_LOCKFLAGS {
  union {
    struct {
      UINT ReadOnly  :1;
      UINT WriteOnly  :1;
      UINT NoOverwrite  :1;
      UINT Discard  :1;
      UINT RangeValid  :1;
      UINT AreaValid  :1;
      UINT BoxValid  :1;
      UINT NotifyOnly  :1;
      UINT MightDrawFromLocked  :1;
      UINT DoNotWait  :1;
      UINT Reserved  :22;
    };
    UINT   Value;
  };
} D3DDDI_LOCKFLAGS;

Members

ReadOnly

A UINT value that specifies whether the locked resource can only be read from. Setting this member is equivalent to setting the first bit of the 32-bit Value member (0x00000001).

WriteOnly

A UINT value that specifies whether the locked resource can only be written to. Setting this member is equivalent to setting the second bit of the 32-bit Value member (0x00000002).

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 Direct3D vertex buffer locks.

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

Discard

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

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

RangeValid

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

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

AreaValid

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

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

BoxValid

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

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

NotifyOnly

A UINT value that specifies whether the lock call is for notification only.

Setting this member is equivalent to setting the eighth bit of the 32-bit Value member (0x00000080).

MightDrawFromLocked

A UINT value that specifies whether the driver is possibly requested to draw from a vertex buffer even if the vertex buffer is locked by the Direct3D runtime. MightDrawFromLocked does not guarantee that the driver will receive calls to its DrawIndexedPrimitive, DrawIndexedPrimitive2, DrawPrimitive, and DrawPrimitive2 functions following the call to Lock. MightDrawFromLocked is set only on vertex buffers that were created with the MightDrawFromLocked bit-field flag set in the Flags member of the D3DDDIARG_CREATERESOURCE structure during create time.

Setting this member is equivalent to setting the ninth bit of the 32-bit Value member (0x00000100).

DoNotWait

A UINT value that specifies whether the user-mode display driver should wait for the resource to become idle. Setting DoNotWait indicates that the user-mode display driver should not wait for the resource to become idle.

Setting this member is equivalent to setting the tenth bit of the 32-bit Value member (0x00000200).

Reserved

This member is reserved and should be set to zero. Setting this member to zero is equivalent to setting the remaining 22 bits (0xFFFFFC00) of the 32-bit Value member to zeros.

Value

A member in the union that is contained in D3DDDI_LOCKFLAGS 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_LOCK

 

 

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