On Sunday 20 March 2005 00:49, Arnt Karlsen wrote: > On Sat, 19 Mar 2005 10:17:39 -0600, Andrzej wrote in message > > <[EMAIL PROTECTED]>: > > > ..you cut your colors from 32bit to 16bit, ATI's cards are > > > all 24bit, how are your 24bit framerates? > > > > My ASUS GeForce 2 Ti 32 MB gives following results (using > > --geometry 1024x768): > > > > 1. Windows 2K with NVidia provided drivers (on of the latest > > FG I believe 0.98 taken from the website a few months ago): > > -16 bit (High Color) - 43-45 FPS > > -32 bit (so called True Color) - 25-42 FPS (it drops to 25 > > or even more > > when the horizon is very far) > > ..24 bit on this? Nvidea didn't do ATI's "24bit cheat", so > their 24bit numbers should line up with either your 16 or 32 > bit figure, and not "hold the middle ground" like ATI, which > tries to with their cheat, which has their "16bit" look better > and their "32bit", like 24bit. > > > 2. Linux Mandrake 10.0 with kernel 2.4 and rather older > > NVidia driver (FG compiled out of the cvs a few days ago): > > -16 bit - 62-77 FPS > > -24 bit - 38-47 FPS > > ..and with the new drivers? Some old Nvidea might even work > with DRI. > > > Note that Windows does not give an option to run 24-bit (I > > am not sure what 32-bit/True Color means either) and Linux > > that 32-bit. > > ..chances are 24bit isn't possible on this combination of OS, > HW and drivers. > > > Interestingly, the sound under Linux and 16-bit mode got > > strangely interrupts. Under Linux 24-bit it I do not see (or > > rather hear :-) that effect.
Using a 32 bpp display mode doesn't give more colours than a 24 bpp display mode - it just adds an 8 bpp alpha layer to go along with the 8 bit R, G & B channels. When 24 bpp data is viewed using a 16 bpp display mode the least significant bits from the R, G & B channels are discarded. Iirc, 3 bits are dropped from the R & B channels and 2 bits from the G channel. LeeE _______________________________________________ Flightgear-users mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
