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vgatest(6)                    Svgalib User Manual                   vgatest(6)

       vgatest - makes basic tests on any svgalib graphics mode


       Mode  test program.  First the program gives a list of the supported modes, then you enter a number and vgatest
       displays a test pattern in that mode.

       The test pattern consists of a sequence of crosses (in different colors, if the mode support has different col-
       ors) in the top left corner.

       Below  you  see  either  four horizontal color bars (white, red, green, and blue with increasing intensity from
       left to right) or vertical stripes.

       If the mode has 32K or more colors, six squares will appear on top of that, each showing some different  smooth
       color shades

       The whole pattern is enclosed in a white border around the edge of the screen.

       See  below  for  details of the test pattern in case you need to verify that it is being displayed correctly or
       diagnose a problem with the display.

       It also shows some details from vga_getmodeinfo(3).

       To terminate the display and exit the program, hit any key.  If that key is 'd', vgatest dumps  the  values  of
       all the SVGA registers to Standard Output, in the manner of vga_dumpregs() before exiting.

       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.

   The Test Pattern
       Here are the details of the test pattern that vgatest displays.

       The screen is surrounded by a white frame which is at the very edges of the screen and one pixel thick.

       At  the top of the screen is a set of 16 overlapping crosses, lined up horizontally 5 pixels apart.  Each cross
       is composed of a one pixel thick line sloping down at 45 degrees and one sloping up at 45  degrees  meeting  in
       the  center.   The top of each of these lines is at the 11th raster line on the screen and the bottom is at the
       90th, so the crosses are 80 lines high.  The leftmost pixel of the crosses is in the 11th column of the  screen
       and the rightmost is in the 165th column.  The lines are in multiple colors, but each line is one color (except
       where it intersects another line).

       Below the crosses are either 4 horizontal bands of color or vertical bars.  If the mode has 2 or 16 colors, you
       get the vertical bars.  If the mode has 256, 32K, 64K, or 16M colors, you get the horizontal bands of color.

       For  a  2  color  mode,  the vertical bars are are one pixel wide white bars, spaced 4 pixels apart all the way
       across the screen on a black background.  The first white bar is in the 3rd  column.   (But  don't  forget  the
       white border described above).

       For  a 16 color mode, the vertical bars are one pixel wide and contiguous, filling the 3rd column from the left
       through the 3rd column from the right.  The bars cycle through each of the 16 colors from left to right.

       The vertical bars start in the 101st raster line and end in the 3rd line from the bottom of the screen.

       For a higher color mode, the color bands fill the 3rd column from the left through  the  3rd  column  from  the
       right.   (leaving  a  column of black and the aforementioned white border at the edges).  The bands are all the
       same height with nothing between them.  They are as large as will fit starting in the 101st line of the  screen
       and ending at or before the 3rd line from the bottom.  So depending on the number of lines on the screen, there
       are 1, 2, 3, or 4 black lines between the lowest bar and the white bottom border.

       The hues of the bands are, from top to bottom, white, red, green, and blue.  Each band goes from zero to  maxi-
       mal brightness from left to right.

       In  addition  to  the  color  bands,  for  a mode with 32K or more colors, six squares, 64 pixels on a side are
       arranged in a matrix centered on the screen, spaced 32 pixels apart.  They replace any other part of  the  test
       pattern.  These are actual squares only if your monitor displays square pixels in this mode, i.e. 64 columns is
       the same length as 64 lines.  Normal monitors, properly adjusted, display square pixels for 1024 x  768  modes,
       but may not for other geometries.

       Each square contains 4096 different colors, one pixel per color, in smooth transition.  In each top square, one
       color component (red, green, or blue) is zero another varies linearly in the vertical direction and  the  other
       varies linearly in the Y direction.  The bottom squares are the same except that one color component is maximum
       instead of zero.

       svgalib(7), vgagl(7), libvga.config(5),  vga_getmodeinfo(3),  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),
       testlinear(6), plane(6), wrapdemo(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 (>= 1.9.13)             01 January 2001                     vgatest(6)