From: Lionel Pinkhard (lionelp@worldonline.co.za)
Date: Fri 11 Aug 2000 - 21:35:00 IDT
Okay, I settled for 320x200x16, looks okay, but maybe I'll have to adjust
the palette later on (my development system has a monochrome monitor, but
I have three other monitors).
I'm having a little trouble with the keyboard, I tried your piece of code
(thanks a lot, BTW!), and I include <ncurses.h> as well, and got this
output:
/tmp/cca020801.o: In function `gameloop':
/tmp/cca020801.o(.text+0x2f2): undefined reference to `noecho'
/tmp/cca020801.o(.text+0x2f7): undefined reference to `cbreak'
Any idea what's going on here?
Also, I checked out the man page for gettimeofday, I'm just having a
little trouble understanding it, what type of variable should I set up to
store it in? Can you give me an example of how I can get the time from it?
Sorry, the man page is talking about struct's, and I don't have that much
experience with it (well, I've never returned a struct, but I have used
them before).
Thanks for the help!
Ciao,
Lionel
On Fri, 11 Aug 2000, Bart Oldeman wrote:
> On Fri, 11 Aug 2000, Lionel Pinkhard wrote:
>
> [just saw that Matan Ziv-Av already answered while I was writing this,
> so some of this overlaps a bit]
>
> > Firstly, my game uses CGA mode 4h, which it doesn't look like SVGALIB
> > supports, is there a way of setting this mode? I saw a function in the
> > source code called vga_addmode(), does this have anything to do with it?
> > If not, what's it for? And how can I use it? Or is it only for internal
> > use?
>
> As far as I could see, vga_addmode just adds (maxx, maxy, bpp,
> etc.) information to the internal mode database. Whilst it is possible
> to add support for it by programming the chipset, you can easily simulate
> CGA mode 4h by using G320x200x16 or G320x200x256 and just using 4 colors.
>
> > Secondly, my routine for trapping keystrokes doesn't work under Linux,
> > here's the code I tried:
> >
> > while (kbhit()) {
> > keypressed = getch();
> >
> > Why doesn't it work? Or what do I need to include?
>
> If you use ncurses you can use getch. See man getch. You could do the
> following:
>
> noecho();
> cbreak(); /* set cbreak mode (don't wait for return key) */
> while (1) {
> keypressed=getch(); /* getch waits for the key */
>
> The DOS method is very dirty in Linux since it continuously polls
> kbhit() and therefore eats a lot of CPU cycles.
>
> Or use vga_getch() instead. Then you don't need ncurses.
> If you need certain keys not available through ncurses/vga_getch then you
> need to use raw keyboard handling. See man svgalib + individual manpages.
>
> > Thirdly, my timing doesn't work, for the old DOS version, I used Interrupt
> > 1ah, is there a way I can get the time in the same format under Linux?
>
> processor time used by program: clock(3)
> seconds since 1 January 1970: time(2)
> most accurate: gettimeofday(2)
>
> > Fourthly, how can I determine whether a joystick is installed? And if so,
> > how can I get it's axis? I have never programmed ports on Linux before,
> > and the outport() and inport() functions don't seem to work, or would I
> > have to rewrite the entire function differently? If so, how?
>
> svgalib has joystick functions. It's better to use them.
> joystick_getaxis(3) is the obvious function to get its axis.
>
> Regards,
> Bart
>
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