blob: 3e309e61981db3f4ffcc06ab3be35f82a88ccbdf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
This is a (very) brief summary of some of things that need to be
done to write a FrameLock NV-CONTROL client.
Please see the sample NV-CONTROL clients in the "samples" directory
for basic examples of how to set integer attributes. See the
file ctkframelock.c for a much more involved example of how the
nvidia-settings utility programs the FrameLock attributes.
The constants referenced below are defined in NVCtrl.h. Please see the
comments in that file for an explanation of each attribute. It may
also be instructive to grep ctkframelock.c to see how each attribute
is used.
Basic steps:
- Open a Display connection to each X Screen you want to control
in your FrameLock cluster. Please make sure you have
priviledges to establish the X connection.
- Query the NV_CTRL_FRAMELOCK attribute to determine if FrameLock
is supported on each X screen.
- Set NV_CTRL_FRAMELOCK_MASTER to NV_CTRL_FRAMELOCK_MASTER_TRUE on
one node in the cluster; set it to NV_CTRL_FRAMELOCK_MASTER_FALSE
to every other node in the cluster.
- Set NV_CTRL_FRAMELOCK_POLARITY for each slave node in the cluster;
most likely you want NV_CTRL_FRAMELOCK_POLARITY_RISING_EDGE.
- Set NV_CTRL_FRAMELOCK_SYNC_DELAY as appropriate for each node.
Most likely you want 0.
- Set NV_CTRL_FRAMELOCK_SYNC_INTERVAL as appropriate if you
are using house sync. Most likely, you just want 0.
- Set NV_CTRL_FRAMELOCK_SYNC to NV_CTRL_FRAMELOCK_SYNC_ENABLE on
each X screen to enable FrameLock.
- (optional) set NV_CTRL_FRAMELOCK_TEST_SIGNAL to
NV_CTRL_FRAMELOCK_TEST_SIGNAL_ENABLE followed immediately by
NV_CTRL_FRAMELOCK_TEST_SIGNAL_DISABLE. This guarantees
accuracy of the Universal Frame Count (as returned by
glXQueryFrameCountNV()).
- When you are done, set NV_CTRL_FRAMELOCK_SYNC to
NV_CTRL_FRAMELOCK_SYNC_DISABLE on each X screen to disable FrameLock.
During operation, you can also query any of these on each X screen:
NV_CTRL_FRAMELOCK_PORT0_STATUS
NV_CTRL_FRAMELOCK_PORT1_STATUS
NV_CTRL_FRAMELOCK_HOUSE_STATUS
NV_CTRL_FRAMELOCK_SYNC_READY
NV_CTRL_FRAMELOCK_STEREO_SYNC
NV_CTRL_FRAMELOCK_ETHERNET_DETECTED
NV_CTRL_FRAMELOCK_SYNC_RATE
NV_CTRL_FRAMELOCK_TIMING
(nvidia-settings registers a gtk+ timeout function and queries the
state of these on each X screen every few seconds).
|
