home *** CD-ROM | disk | FTP | other *** search
- GL Documentation
-
- Program:
- GL
- GLSplit
- Pictor
-
- Purpose:
- To fiddle with GRASP animation files. These are found on PClones,
- with the extension ".GL".
-
- GRASP is a product of Microtex Industries, Inc.
-
- Author:
- John Bickers (JJB Templar) - jbickers@templar.actrix.gen.nz
-
- Credits:
- This was written using SAS C 5.10a.
-
- The digital dissolve effect (fade 20) is from "A Digital 'Dissolve'
- Effect", by Mike Morton, pg 221 of "Graphics Gems".
-
- The format of a .GL file was obtained from the documentation file
- for xgrasp, a Sun .GL player written by Patrick J. Naughton
- (naughton@sun.com). This file included what appears to be documentation
- from an early (Useware) version of GRASP.
-
- The formula to convert from an RGB triple to a grayscale level is
- from Usenet's comp.graphics FAQ.
-
- Motivation is from MANDY-2.GL, which I saw running on a PS/2, and
- which convinced me that perhaps PClone animations are worth
- noticing.
-
- Using GL:
- This program is the .GL player. It has a number of limitations, which
- include no font or text support, only two fades (0 and 20), etc.
- However, it plays MANDY-2.GL ok, which is all I ask.
-
- The CLI usage is:
-
- WSH 3> gl [-g] filename
-
- The optional "-g" parameter tells GL to use a grayscale colormap for
- the data. This is usually necessary for VGA animations, which have
- 256-color palettes. The original 256 colors are then mapped onto
- 16 gray levels. Note that this makes a number of GRASP color commands
- and tricks useless, since the source data is converted into 4 bits
- per pixel during the "cload" or "pload" commands, and cannot be
- remapped to a new palette.
-
- GL can only handle two of the many video modes a .GL may have. These
- are CGA 640x200/1 ('C'), and VGA 320x200/8 ('L'). These happen to
- be the only sample files available to me. I'd be happy to add more,
- should the opportunity arise.
-
- While GL is running, there are a few keystrokes available to the
- user. These only take action when the animation pauses for input,
- so don't be surprised if it takes a while for a keystroke to have
- an affect.
-
- Esc terminates the animation.
-
- Space puts the animation into "command mode". In this mode, pressing
- 'S' will save the screen as an IFF ILBM, pressing Space will advance
- the animation to the next input position, then go straight to command
- mode, and any other reasonable key should resume the animation.
-
- GL was written on an A2630. I've tried it on the 68000, and it is
- quite slow, sorry. There are no waves when updating clips on the
- 68030.
-
- In my opinion, converting a .GL to something nice for the Amiga is
- too much hassle to write a free program for (I don't know any
- convenient Amiga formats, for example. ANIM option 5 is out). The
- easiest approach is probably to extract the elements of the
- animation, convert them to HAM if necessary, then put them back
- together using an Amiga animation program.
-
- Using GLSplit:
- This is like GRASP's "GLIB" program, but with extraction and listing
- capabilities only. A .GL file is similar to an archive, and GLSplit
- will allow one to extract any file one wishes.
-
- The CLI usage is:
-
- WSH 3> glsplit [-l] [-oprefix] [-xname] filename
-
- If no options are specified, glsplit will extract all files from
- "filename" into the current directory.
-
- The optional "-l" parameter will produce a list of the files
- within the .GL.
-
- The optional "-o" parameter specifies a prefix for the output files.
- For example, if one wanted to extract all files to ram:, one would
- use:
- WSH 3> glsplit -oram: filename
-
- The optional "-x" parameter specifies that a particular file should
- be extracted. For example, if one of the files in the .GL file happened
- to be "main.txt", you could extract just that file with:
- WSH 3> glsplit -xmain.txt filename
-
- Using Pictor:
- This program is intended to either display or convert PCPaint
- picture files. These include the .PIC and .CLP files found in .GLs.
- The same video modes are recognised as with GL - that is, Pictor
- only knows how to handle CGA ('C') and VGA ('L') pictures. Again
- similar to GL, Pictor displays 'L' mode pictures into a 4-bitplane
- LORES screen.
-
- The CLI usage is:
-
- WSH 3> pictor [-vo] [-g] [-sname] [-lname] [-wname] filename
-
- The optional "-v" parameter generates information from the header
- of the picture. If an 'o' follows the 'v', then this is all the
- processing that occurs (ie: [v]erbose [o]nly).
-
- The optional "-g" parameter uses a grayscale colormap. HAM etc
- conversion is better done with other tools, like HamLab(*).
-
- The optional "-s" parameter tells Pictor to save the colormap of
- the picture as a seperate file. The default name is "ram:savecolor",
- and can be overridden by placing a filename directly after the "-s".
- The purpose of this parameter is to provide .CLP (clip) pictures with
- a colormap, since they do not usually have one. For example, if you
- had two files "palette.pic" and "clip1.clp", you could display the
- .clp file with:
- WSH 3> pictor -s palette.pic
- WSH 3> pictor -l -g clip1.clp ;or pictor -l -w clip1.clp
-
- The optional "-l" parameter tells Pictor to load the colormap
- for the picture from a file. The default name is the same as for
- the "-s" parameter. This colormap can be used along with the
- "-g" and "-w" options, either to display correct grayscales, or
- to write out the correct colormap to the FIG workfile.
-
- The optional "-w" parameter tells Pictor to write out the picture
- as a workfile for my FIG(**) programs. The default name is
- "ram:pictor.wrk". Older versions of the FIG software will not work
- with these files, since I've added a two-byte identifier to the
- workfile header in order to identify them to HamLab. I either use
- FIG, or a filter that reads a workfile into HamLab, to process these
- files.
-
- (*) HamLab is an image conversion package written by Ed Hanway. The
- package is shareware, though freely redistributable versions are
- available. As of this writing, the version number is 1.1, and
- Ed's email address is "jeh@sisd.kodak.com".
-
- (**) FIG is an image conversion package written by me, before I
- got HamLab. I still find it useful, since it only fiddles with 8-bit
- data (therefore requires less space) and is script-driven.
-
- To do:
- Implement GRASP commands/video modes as required, I guess. No big
- deal.
-
- Use the Blitter for updating clips etc? Would be faster (and easier
- than using assembler), but display updates would flicker a lot, and
- it would require more CHIP RAM than it currently does.
-
- Assembler optimizations of some of the drawing stuff?
-
- Dithering in the grayscale mode?
-
- Personal stuff:
- Suggestions are welcome, and may even be implemented. I can be
- contacted at the following:
-
- Snail: John Bickers,
- 214 Rata St,
- Naenae 6301,
- New Zealand.
-
- Email: jbickers@templar.actrix.gen.nz
-
- Phone: 677-334, 672-085, or 746-625.
-
- People who use this program are also invited to send some notification
- of their existence to any of the above points. Feel free to pay
- something (esp. if you want to request that something be added :) too,
- but payment is not a requirement. I'd be more interested in X-rated
- animations, actually (NOT NOT NOT via email! I have to pay $$ for
- that!). Either Amiga disks, or MS-DOS disks up to 1.4M, are ok.
-
- This program may be redistributed freely, but not for commercial gain
- (ie: Fred Fish type costs are ok). Note that you should include the
- documentation.
-
- GL, GLSplit and Pictor are Copyright ⌐ 1991 by John Bickers. Heh.
-
- History:
- 19-Mar-91 GLSplit 1.0 Begun.
- 20-Mar-91 Pictor 1.0 Begun.
- 23-Mar-91 GL 1.0 Begun.
- 24-Mar-91 Pictor 1.1 Allow -w for CGA mode.
- 26-Mar-91 GL 1.1 Now unpacking VGA pixels at [cp]load time.
- Fixed box, cfade and fly y coordinates.
- 30-Mar-91 GL 1.1 Fixed non-byte-aligned clips.
-
- Disclaimer:
- "It works on my machine" (so far :).
-