Enabling And Configuring Genlock - Nvidia Frame Synchronization User Manual

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Table Of Contents

Table of Contents

HAPTER

Using the OpenGL Extensions

• If the window belongs to a group and that group is bound to a barrier, all groups

bound to that barrier must be ready.

Group and Barrier Buffer Swaps

• Buffer swaps for all windows in a swap group take place concurrently, and buffer

swaps for all groups using a barrier take place concurrently.

For barrier swaps, the vertical retraces of the screens of all the groups must also be

synchronized, otherwise there is no guarantee of concurrency between groups.

• An implementation may support a limited number of swap groups and barriers, and

may have restrictions on where the users of a barrier can reside.

For example, an implementation may allow the users to reside on different display

devices or even hosts. An implementation may return zero for any of maxGroups and

maxBarriers returned by QueryMaxSwapGroupsNV if swap groups or barriers are not

available in that implementation or on that host.

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 QueryFrameCountNV().

• To reset the frame count back to zero, call, ResetFrameCountNV().

In a system that has an NVIDIA frame-lock device installed and enabled,

ResetFrameCountNV() succeeds only when the frame lock device is configured as a

Master device.