Curtis Olson a écrit : > 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. Dell Latitude C840 is with a GeForce4 440 Go card (NV 17) (OpenGL 1.2 hardware support). And I have a GeForce4 440 Mx 8X (NV 18) (OpenGL 1.2 hardware support). These 2 cards have the same power. Yes I can use correctly my GeForce4 440 Mx 8X - 64MB card with old drivers but not my new Geforce 6200 Agp 8x - 256Mb with old drivers. I buy for nothing this last card for Flightgear and I'm not happy with this fact.
> > Again, you've clearly done your homework and checked a lot of angles, Yes, because I can not use my new Geforce 6200 Agp 8x - 256Mb with Flightgear 1.0.0. The solution for me is to use my old GeForce4 440 Mx 8X with old drivers that works correctly with Flightgear 1.0.0. > but I wonder if there might really be something else going on that is > causing your slow frame rates? What ? For the request : 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. The answer is no ? Is-it possible to do a specific compile for a flightgear binary that can use only features in OpenGL 1.3 or lower ? Opengl 1.4 and upper features in the drivers will be ignored by FlightGear. And how to do this ? Thanks in advance for your answer . Best regards, Yannick. > > Best regards, > > Curt. > -- > Curtis Olson: http://baron.flightgear.org/~curt/ > <http://baron.flightgear.org/%7Ecurt/> > Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d > ------------------------------------------------------------------------ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
