HRESULT SetMode(
DWORD dwMode, DWORD dwApply);
Sets the operation mode for 3D sound processing.
·Returns DS_OK if successful, or DSERR_INVALIDPARAM otherwise.
dwMode
Flag specifying the 3D sound processing mode to be set.
DS3DMODE_DISABLE
Processing of 3D sound is disabled. The sound seems to originate from the center of the listener's head.
DS3DMODE_HEADRELATIVE
Sound parameters (position, velocity, and orientation) are relative to the listener's parameters. In this mode, the absolute parameters of the sound are updated automatically as the listener's parameters change, so that the relative parameters remain constant.
DS3DMODE_NORMAL
Normal processing. This is the default mode.
dwApply
Value indicating when the setting should be applied. This value must be one of the following:
DS3D_DEFERRED Settings are not applied until the application calls the IDirectSound3DListener::CommitDeferredSettings method. This allows the application to change several settings and generate a single recalculation.
DS3D_IMMEDIATE Settings are applied immediately, causing the system to recalculate the 3D coordinates for all 3D sound buffers.