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1992-01-06
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DBVGAL15.ZIP David Boynton's VGA Library, V1.5
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This library is placed in the public domain. However, if you like
it, and would like to make a small donation to encourage me to
improve this product, my address is:
David Boynton
8083 Budding Br Rd, T-3
Glen Burnie MD 21061-5077
Please let me know of any "corrections" or improvements you'd
like to see.
Send netmail to either: Avi-technic BBS 1:261/662
or: Dave's Doghouse 1:261/1096 (different Dave)
Detailed instructions can be obtained from the header files.
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VIDLIB.H
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The library is built from seven major components:
masm functions
vidlib.obj general VGA functions
vidlib4.obj 16 color mode VGA functions
vidlib8.obj 256 color mode VGA functions
vesa.obj general VESA functions
vesa8.obj 256 color mode (640x400,640x480,etc) VESA functions
vtext.obj text mode function (25,28,33,40,50 line mode sets)
Caveat Programmer: remember, all function arguments are in bytes,
not pixels; there is no bitblt (unaligned move) function
in this library for 16 color modes.
Also, beware of using the low-level VGA register functions
with inappropriate values. They do no checking for ignorance.
Most of the C functions would be a lot faster in masm, but I haven't
gotten around to converting them yet. The 16 color functions in
particular.
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DEMOS
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They were never really intended as "Demos" in the way you probably
think, but as "test" programs to show how the library works (or IF
the library works).
testvl.exe: tests the text, 16 color, 256 color, 256 color vesa,
and palette functions.
test.exe: tests the low-level (VGA register level) functions.
vgaregs.exe: uses the library to dump the VGA registers to the
standard output.
vesainfo.exe: shows information about what VESA modes are available
on the current display card.
l28.com: sets the display to 28 lines, EGA font (9x14).
l33.exe: 33 lines, modified EGA font (9x12).
l40.com: 40 lines, CGA font in larger box (9x10). Note that
line-drawing characters don't connect in this mode.
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DEBUGGING
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The library currently has a "debugging mode" built in. All you
have to do is call the 'Start_vgadebug(pathname)' to open (or append)
a debug file, and 'Close_vgadebug()' to turn it off. It can
be turned on/off/on/ etc. several times during a given program.
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VESA.H
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The functions in this module have undergone a lot of work and
testing. If all you need is 256 color modes, this has everything
you need. Run testvl.exe (after loading your vesa BIOS driver) for
a sample.
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Credits
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Much credit goes to books like:
"Advanced Programmer's Guide to SuperVGAs", George Sutty and
Steve Blair. Published by Brady; ISBN 0-13-010455-8.
"Power Graphics Programming", Michael Abrash. Published by Que;
ISBN 0-88022-500-9.
No part of this library comes directly out of either book; all
is original programming.
The vesainfo.c demo program mostly came from the first book;
I rewrote it to take advantage of my library.
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Coming Soon
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vtext - will support the full 256k (or 512k) VGA buffer.
(for storage of text screens, or anything else)
vidlib4 - will have a bitblt.
- line and curve drawing.
vidlib8 - Anti-aliasing, palette manipulation, full use of
VGA memory.
vidlib - non-standard mode sets like 320x240, 320x400,
and functions to support them (the hard part).
I already have the code for the mode sets, but
it's what you do after that's so complicated.
vesa4 - ?
vesa8 - support for independent read/write windows.
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