Nvidia QUADRO G-SYNC II, Руководство пользователя

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Frame Counter
The implementation provides a universal counter, or frame counter, among
all systems that are locked together by swap groups/barriers. It is based
on the internal synchronization signal which triggers the buffer swap.
 To obtain the current frame count, call
wglQueryFrameCountNV(),glxQueryFrameCountNV()().
 To reset the frame count back to zero, call,
wglResetFrameCountNV(),glxResetFrameCountNV()()
.
In a system that has a Quadro G-Sync II device installed
and enabled,
ResetFrameCountNV()
succeeds only when
the frame lock device is con fi gured as a master device.
Confi guring for Swap Sync
Confi guring Swap Groups
You can assign an OpenGL window to a swap group. There
is a maximum number of allowable swap groups that can be
created for any particular implementation. With the current
hardware, the maximum number of swap groups is one.
 To determine the maximum swap group number, call
QueryMaxSwapGroupsNV()
 To assign a window to a swap group, call
JoinSwapGroupNV()
and specify the swap group number.
If rendering surface is already a member of a different group, it is
implicitly removed from that group. If the swap group number is zero,
the rendering surface is removed from the current group.
To query the current swap group, call
QuerySwapGroupNV()
.
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NVIDIA Quadro G-Sync II User Guide