IDirect3DDevice9::Reset method (d3d9helper.h)

Resets the type, size, and format of the swap chain.


  [in, out] D3DPRESENT_PARAMETERS *pPresentationParameters


[in, out] pPresentationParameters


Pointer to a D3DPRESENT_PARAMETERS structure, describing the new presentation parameters. This value cannot be NULL.

When switching to full-screen mode, Direct3D will try to find a desktop format that matches the back buffer format, so that back buffer and front buffer formats will be identical (to eliminate the need for color conversion).

When this method returns:

  • BackBufferCount, BackBufferWidth, and BackBufferHeight are set to zero.
  • BackBufferFormat is set to D3DFMT_UNKNOWN for windowed mode only; a full-screen mode must specify a format.

Return value




If a call to IDirect3DDevice9::Reset fails, the device will be placed in the "lost" state (as indicated by a return value of D3DERR_DEVICELOST from a call to IDirect3DDevice9::TestCooperativeLevel) unless it is already in the "not reset" state (as indicated by a return value of D3DERR_DEVICENOTRESET from a call to IDirect3DDevice9::TestCooperativeLevel). Refer to IDirect3DDevice9::TestCooperativeLevel and Lost Devices (Direct3D 9) for further information concerning the use of IDirect3DDevice9::Reset in the context of lost devices.

Calling IDirect3DDevice9::Reset causes all texture memory surfaces to be lost, managed textures to be flushed from video memory, and all state information to be lost. Before calling the IDirect3DDevice9::Reset method for a device, an application should release any explicit render targets, depth stencil surfaces, additional swap chains, state blocks, and D3DPOOL_DEFAULT resources associated with the device.

There are two different types of swap chains: full-screen or windowed. If the new swap chain is full-screen, the adapter will be placed in the display mode that matches the new size.

Direct3D 9 applications can expect messages to be sent to them during this call (for example, before this call is returned); applications should take precautions not to call into Direct3D at this time. In addition, when IDirect3DDevice9::Reset fails, the only valid methods that can be called are IDirect3DDevice9::Reset, IDirect3DDevice9::TestCooperativeLevel, and the various Release member functions. Calling any other method can result in an exception.

A call to IDirect3DDevice9::Reset will fail if called on a different thread than that used to create the device being reset.

Pixel shaders and vertex shaders survive IDirect3DDevice9::Reset calls for Direct3D 9. They do not need to be re-created explicitly by the application.

D3DFMT_UNKNOWN can be specified for the windowed mode back buffer format when calling IDirect3D9::CreateDevice, IDirect3DDevice9::Reset, and IDirect3DDevice9::CreateAdditionalSwapChain. This means the application does not have to query the current desktop format before calling IDirect3D9::CreateDevice for windowed mode. For full-screen mode, the back buffer format must be specified. Setting BackBufferCount equal to zero (BackBufferCount = 0) results in one back buffer.

When trying to reset more than one display adapter in a group, set pPresentationParameters to point to an array of D3DPRESENT_PARAMETERS structures, one for each display in the adapter group.

If a multihead device was created with D3DCREATE_ADAPTERGROUP_DEVICE, IDirect3DDevice9::Reset requires an array of D3DPRESENT_PARAMETERS structures wherein each structure must specify a full-screen display. To switch back to windowed mode, the application must destroy the device and re-create a non-multihead device in windowed mode.


Requirement Value
Target Platform Windows
Header d3d9helper.h (include D3D9.h)
Library D3D9.lib

See also





Multihead (Direct3D 9)