Chris Campbell wrote:
On Feb 6, 2009, at 5:46 AM, jav...@javadesktop.org wrote:
Hi,
I'm trying to get straight in my head exactly which graphics rendering
surfaces can get hardware accelerated in Java. There seems to be a lot
of confusing/half specified information around.
Firstly let me state I'm using Java 6u12 on a Windows XP machine. I'm
interested in rendering TO surfaces, not copying from, so I'm not too
bothered about managed images.
As far as I can tell the setup goes like this:
1) Live screen graphics, i.e. Component.getGraphics() : HW
accelerated via Direct3D
For now I'll just say "yes", but Dmitri could explain the caveats of
this when he gets back from vacation.
So as Chris mentioned, the short answer is "yes", the long
answer is "don't do it if you can help it". This includes
the typical double-buffering mechanism of rendering to a
VolatileImage and copying it to the screen.
Since DirectX 9 doesn't allow rendering directly to the screen,
we have to redirect on-screen rendering into an offscreen buffer
which is then presented, thus effectively making on-screen
rendering double-buffered.
This means that if you have a VI back-buffer, when you copy
it to the screen it actually is copied to an offscreen surface
which is then presented to the screen, making it triple-buffered,
which is less efficient.
So the conclusion is: use BufferStrategy for double buffering,
and never render to the screen directly.
Thanks,
Dmitri
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