ID3DXPatchMesh::LockIndexBuffer method

Lock the index buffer.

Syntax

HRESULT LockIndexBuffer(
  [in]          DWORD  flags,
  [out, retval] LPVOID *ppData
);

Parameters

flags [in]

Type: DWORD

Combination of zero or more locking flags that describe the type of lock to perform. For this method, the valid flags are:

• D3DLOCK_DISCARD
• D3DLOCK_NO_DIRTY_UPDATE
• D3DLOCK_NOSYSLOCK
• D3DLOCK_READONLY

For a description of the flags, see D3DLOCK.

ppData [out, retval]

Type: LPVOID*

VOID* pointer to a memory buffer containing the returned index data.

Return value

Type: HRESULT

If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one of the following: D3DERR_INVALIDCALL, E_OUTOFMEMORY.

Remarks

The index buffer is usually locked, written to, and then unlocked for reading. Patch mesh index buffers are 16-bit buffers.

Requirements

See also

ID3DXPatchMesh

D3DXCreatePatchMesh