DRAW process blocks?

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Gene Koh (gene++at++euphoria.corp.sgi.com)
Wed, 6 Mar 1996 11:55:55 -0800

Hi there,

I'm a little puzzled about the behavior of the DRAW process. According to the
stats, when DRAW is forked as a separate process, it doesn't begin processing
until the next frame boundary. As a result, I'm seeing a two frame latency in
PFMP_APPCULL_DRAW mode.

-----> a0 (sync) ||-| || ||
|| |--| c0 || ||
|| (draw blocks) ||----------| d0 || (swap)

In PFMP_APP_CULLDRAW, 1 frame latency.

-----> a0 (sync) ||-| ||
|| |--| c0 ||
|| |----------| d0 || (swap)

In Prog. Guide, it states that both of these modes should only have 1 frame
latency. Why does the DRAW block until the next frame boundary? Does it do so
in cases other than being a separate process? Thanks!

-- 
gene koh		gene++at++corp.sgi.com		415.933.4230


simplicity   patience   compassion

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