[gameprogrammer] Re: Windows Vista and OpenGL
- From: "richard sabbarton" <richard.sabbarton@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Tue, 6 May 2008 16:05:57 +0100
Hi Guys,
Thanks all for your feedback. First thing I did was download the
latest drivers from Lenovo. The nVidia site states that the drivers
are custom for the Lenovo kit to be compatible with powersave features
etc. etc. This didn't help. The graphics still seemed clunky but, I
checked from the performance point of view and the framerate is
identical to the XP machine.
The GL_POINT_SMOOTH behaviour is different so I have been able to fix
that by swithcing it off. I don't think it was having any effect on
my XP machine. Now I just have the distance faces to worry about. I
am just a hobby-coder so it is a very real possibility that this is my
fault.
Still investigating!
Rich
2008/5/6 Charlie Lobo <charlie.lobo@xxxxxxxxx>:
> It might be because the video driver moved from Kernel to User space, which
> is safer but slower. OpenGL has always been nerfed slightly on windows, it's
> not official data but it's a "known fact" amongst programmers, mostly
> because OpenGL isn't a nicely integrated with everything as DirectX and
> Windows doesn't allow anything to integrate like that. All I can say is
> upgrade the drivers and check with nVidia (forums or something).
>
>
>
> On Tue, May 6, 2008 at 8:24 AM, DARKGuy . <dark.guy.2008@xxxxxxxxx> wrote:
> > I've had a similar problem on the same hardware with a simple "2D"
> > game I'm developing with my team, we use OpenGL for emulating the 2D
> > (and also to have its features such as lightning, zoom and so on) and,
> > somehow, the code in Vista ran HELLA SLOW compared to Linux and XP...
> > I dunno why.
> >
> > I think I read somewhere that they nerfed up the whole OpenGL
> > libraries in Vista so OpenGL didn't have as much power as D3D did, but
> > I think it's just a matter of DLL replacement.
> >
> > If you find a solution, please share it! :D
> >
> >
> >
> >
> > On Tue, May 6, 2008 at 5:01 AM, richard sabbarton
> > <richard.sabbarton@xxxxxxxxx> wrote:
> > > Hi All,
> > >
> > > I have moved to Windows Vista and I am seeing a significant difference
> > > in the results of running the same code on Windows XP. Specifically,
> > > the rendering quality seems to be off. Difficult to describe but I am
> > > seeing a lot of flicker when rendering that I was not seeing before
> > > and it doesn't appear to be because of the performance of the
> > > computer. The flicker only seems to occur when moving. If I leave
> > > the scene in place it renders OK but then when I rotate some objects
> > > in the distance flicker off and then back on. It is as if they
> > > sitting on a clipping plane and flipping from one side to another and
> > > it only seems to be on the farthest objects from the camera (Have I
> > > just answered my own question??? Will check...) The XP machine is
> > > about 3 years old (Tosh laptop/nVidia Chipset) and runs perfect. The
> > > Vista machine is a brand new IBM/Lenovo with nVidia chipset. Although
> > > the video adapters are different they should be comparible and the IBM
> > > should be a little better.
> > >
> > > I was just wondering if any of you have had similar problems coding
> > > for Vista with OpenGL or anything else for that matter. Am I doomed?
> > > Do I need to switch to Direct3D?
> > >
> > > Regards
> > >
> > > Richard
> > >
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> > >
> >
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