From CRT to LCD
james at grayonline.id.au
Sat Sep 16 13:52:24 UTC 2006
On 16/09/2006, at 10:30 AM, dethadol wrote:
>>> Thanks that is brilliant. Is there any reason for using 3d
>>> hardware-accelerated even if I don't use it please?
>> games, video playing, video rendering CAD design and other
>> graphics intensive operations all benefit from 3D acceleration.
>> If you use these kind of applications, then try the closed
>> source drivers and see if the benefit is worth it.
> Sorry to show my ignorance but can anyone explain why 3D accel is
> for video playing please?
Generally speaking, it isn't. However, many video cards with 3D
accelleration are also capable of off-loading much of the video-
decoding from the CPU as well. This will allow your system to remain
responsive while you play back gitter and stutter free video.
Without the decode off-load (using 3D accelerated video cards) your
poor CPU has to do all the work. Given that modern CPU's are quite
powerful you probably wouldn't have any problems without the OpenGL
acceleration, but why waste CPU time on something like video when
your graphics card spends most of its life idling in the background?
Multi-core CPU's are even more adept at handling multiple tasks (such
as video decode and "other" stuff at the same time)...but why not
utilise a resource that will provide you with some significant
performance benefits? FWIW, I've noticed that enabling OpenGL
options on video play back generally results in better images and
smoother play back (at least in mplayer anyway). YMMV.
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