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18.5. A Multi-Projector VR Theater System 517
send the part of the image that the slave is to display. The second
thread will handle control messages to be sent to the client.
The slave also starts two communications threads. One will retrieve the
image from the master; the other waits for commands from the master
and posts messages into the message loop to execute those commands.
• When the master is instructed to display an image, it reads and decodes
the pixel data into an RAM buffer (stereoscopic images are stored in
left-over-right format). This is labeled 1 in Figure 18.7.
• The master sends a control signal to the slave to tell it that a new image
is ready to be grabbed (Step 2).
• The slave tells the master to dispatch the part of the ...