On Jan 2, 2008 2:14 PM, Yannick LE NY <> wrote:
> There is a big problem with Nvidia drivers, because Nvidia add OpenGL
> 2.0 and 2.1
> support in these drivers but some nvidia chip like Geforce 4 MX 440 have
> only OpenGL 1.2
> hardware features support.
> But Flightgear use nvidia drivers and found Opengl 2.0 support that are
> only Opengl software features support ans cost a lot in CPU.
> More analysis here :
>
> http://www.mail-archive.com/[EMAIL PROTECTED]/msg14993.html
>
> Please add a command line option like
> fgfs.exe --opengl-version-to-use=
> for restricting flightgear to use a specific opengl version and not the
> version that was indicated by the nvidia driver.
> With this option, I can use flightgear with the GPU opengl 1.2 hardware
> functions only in my nvidia geforce 4 mx440 graphic card.
> Opengl 2.0 software functions cost too many in CPU resources/power in
> Flightgear 1.0.0.
>
> Thanks to correct or add this workaround in the Flighgear source.
>
> PS : Here ,
> http://wiki.flightgear.org/flightgear_wiki/index.php?title=Hardware_Recommendations
> >Wiki said :
> > Recommended hardware specs
> > 3D hardware accelerator, 128-256 MB, OpenGL 1.2 capable (2.0 even
> better!)
> Flightgear should work with only an OpenGL 1.2 capable graphic card.
I really appreciate the detailed analysis and investigation you have done
here, but I wonder if there is something more or different going on here.
Until very recently (when my work laptop died) I was happily running
FlightGear in 16 bpp mode on a 32Mb original GeForce Go card with old/legacy
drivers ... this was a Dell Latitude C840. The laptop was 2001/2002
vintage. The laptop is dead so I can't confirm with the latest cvs, but up
until about two months ago, it actually ran current OSG FlightGear
surprisingly well for how old and underpowered the machine was.
Again, you've clearly done your homework and checked a lot of angles, but I
wonder if there might really be something else going on that is causing your
slow frame rates?
Best regards,
Curt.
--
Curtis Olson: http://baron.flightgear.org/~curt/
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