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IDirect3DSwapChain9::GetBackBuffer method

Retrieves a back buffer from the swap chain of the device.

Syntax


HRESULT GetBackBuffer(
  [in]           UINT BackBuffer,
  [in]           D3DBACKBUFFER_TYPE Type,
  [out, retval]  IDirect3DSurface9 **ppBackBuffer
);

Parameters

BackBuffer [in]

Type: UINT

Index of the back buffer object to return. Back buffers are numbered from 0 to the total number of back buffers - 1. A value of 0 returns the first back buffer, not the front buffer. The front buffer is not accessible through this method. Use IDirect3DSwapChain9::GetFrontBufferData to retrieve a copy of the front buffer.

Type [in]

Type: D3DBACKBUFFER_TYPE

Stereo view is not supported in Direct3D 9, so the only valid value for this parameter is D3DBACKBUFFER_TYPE_MONO.

ppBackBuffer [out, retval]

Type: IDirect3DSurface9**

Address of a pointer to an IDirect3DSurface9 interface, representing the returned back buffer surface.

Return value

Type: HRESULT

If the method succeeds, the return value is D3D_OK. If BackBuffer exceeds or equals the total number of back buffers, then the function fails and returns D3DERR_INVALIDCALL.

Remarks

Calling this method will increase the internal reference count on the IDirect3DSurface9 interface. Failure to call IUnknown::Release when finished using this IDirect3DSurface9 interface results in a memory leak. You must release any surfaces obtained through this method before releasing the swap chain it belongs to.

Requirements

Header

D3D9.h

Library

D3D9.lib

See also

IDirect3DSwapChain9
IDirect3DSwapChain9::GetFrontBufferData

 

 

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