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testlinear(6)                 Svgalib User Manual                testlinear(6)

       testlinear, lineart - test a linear frame buffer


       Program to test linear addressing on Cirrus cards and on Mach32 (and other cards which may support it).

       Selects  640x480x256  and  tries  to  enable  a linear frame buffer (its virtual address is printed). Fills the
       screen in some color, then draws pixels in random positions.

       For Cirrus cards some direct hardware access is then made for highspeed screen access.   Except  for  the  last
       (Cirrus  only)  test  no speeds are printed, but you are welcome to use 'time' to measure it. The program draws
       714400 one byte pixels plus a forced 1s delay and various rand() calls for the pixels.

       The testlinear demo needs a few presses of <Return> after each minimal demo step. Even when it does not  prompt
       for it. When it appears to be stuck, just press <Return>.

       The  lineart  demo is the same, but it accepts a command line with an arbitrary number of modes.  The modes may
       be either mode numbers or names, or both.  For example,

       lineart 11 17 G800x600x32k 22

       will give a display of mode 11.  If a key is pressed mode 17 will appear, followed by mode 20 and 22 as  succe-
       sive keys are pressed.

       This  demo is part of svgalib and can be found in the demos/ subdirectory of the original svgalib distribution.
       However, it is not installed in the system by default, s.t. it is unclear where you can find it if your svgalib
       was  installed by some linux distribution. Even then, when you have the demo on your system, you probably won't
       have the sources s.t. it is only of limited use for you.

       In case of any such problem, simply get an svgalib distribution from the net. You even don't  need  to  install
       it. Just make in the demos/ subdirecty. As of this writing, svgalib-1.2.12.tar.gz is the latest version and can
       be   retrieved   by   ftp   from   at   /pub/Linux/libs/graphics   and    at
       /pub/linux/sources/libs which will most probably be mirrored by a site close to you.

       svgalib(7),  vgagl(7),  libvga.config(5),  threed(6),  accel(6), bg_test(6), eventtest(6), forktest(6), fun(6),
       keytest(6), mousetest(6), scrolltest(6), speedtest(6), spin(6), testaccel(6), testgl(6), vgatest(6),  plane(6),

       This  manual  page  was edited by Michael Weller <>. The exact source of the refer-
       enced demo as well as of the original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <>.

       Occasionally  this  might be wrong. I hereby asked to be excused by the original author and will happily accept
       any additions or corrections to this first version of the svgalib manual.

Svgalib (>= 1.2.11)              29 July 1997                    testlinear(6)