3it: 3DO Image Tool

An all purpose 3DO image conversion tool. Can convert to and from JPEG, PNG, BMP, 3DO CEL, 3DO Banner, 3DO ANIM, 3DO IMAG, NFS 3SH, and NFS wwww formats. Supports coded and uncoded, packed and unpacked, linear and lrform CELs.

Usage

$ 3it --help
3it: 3DO Image Tool
Usage: 3it [OPTIONS] SUBCOMMAND

Options:
  -h,--help                   Print this help message and exit
    --help-all

Subcommands:
  info                        prints info about the file
  to-cel                      convert image to CEL
  to-banner                   convert image to banner
  to-imag                     convert image to IMAG
  to-lrform                   convert image to raw LRFORM
  to-nfs-shpm                 convert image to NFS SHPM
  to-bmp                      convert image to BMP
  to-png                      convert image to PNG
  to-jpg                      convert image to JPG
  list-chunks                 list 3DO file chunks
  dump-packed-instructions, dpi
                              print out a packed CEL's instruction list
  version                     print 3it version
  docs                        print links to relevant documentation

$ 3it to-cel --help
...

All subcommands have their own help and arguments. Use --help or --help-all to see all available options.

Notes

• All images are first converted to RGBA8888 before converting to the target format.
• No dithering is done by 3it when reducing bit depth.
• VDLP is not considered at all. The assumption is that the fixed, default CLUT is used. IE a linear dark to light gradiant.
• When converting to coded (paletted) formats the number of colors will be checked. The transparent color is not included.
• The 3DO CEL renderer has many features. A good number of them are rarely used. As such 3it does not support all permutations of options when converting to or from supported formats. If an image looks wrong please file a ticket and include as much information as you can including program arguments and the original source file.

File Types

LRFORM

It is common to use IMAG files as a background that is used to clear the screen between screen updates by leveraging SPORT VRAM -> VRAM copying. However, due to alignment requirements and needing to read data off of a CDROM the LoadImage() function utilizes more resources than needed. Especially given LoadImage were never expanded to support anything but 320x240 @ 16bpp LRFORM images.

Having a raw LRFORM file allows the user to load it using LoadFile and saves on resources. See LoadImage's code for more details.

int memflags;
int filesize;
char *image;
char *filename = "image.lrform";

memflags = (MEMTYPE_TRACKSIZE|MEMTYPE_STARTPAGE|MEMTYPE_VRAM);
image    = LoadFile(filename,&filesize,memflags);

Output Filename Templates

Any command with an --output-path option supports templating to make scripting easier. It uses a currly brace notation such as {foo}. Below is a list of supported values per subcommand.

All support:

• {filepath}: Full original input filepath.
• {dirpath}: Parent path of {filepath} if it has one. "." otherwise.
• {filename}: Just the filename without dirpath or extension.
• {origext}: The original filepath's extension. Includes prefixed '.'.
• {ext}: The standard extension for the target file.
• {name}: If supported by the input the internal name for the image. Prefixed with "". Otherwise "".
• {index}: The index of the image if the input had multiple images.
• {index}: The index prefixed with "" if input had multiple images. Otherwise "".
• {w}: Width of the output image.
• {h}: Height of the output image.

to-cel

• {coded}: "coded" if coded else "uncoded".
• {packed}: "packed" if packed else "unpacked".
• {lrform}: "lrform" if lrform else "linear".
• {_lrform}: "_lrform" if lrform otherwise "".
• {bpp}: The CEL bits per pixel.
• {flags}: CCB flags in hex.
• {pixc}: CCB PIXC/PPMPC in hex.
• {rotation}: "0", "90", "180", or "270"

to-banner

• {bpp}: Always 16.

Others

No extras.

TODO

• dump APPSCRN from ISO
• dump-chunks
• concat-chunks
• to ANIM
• ability to write text chunks
• figure out NFS HSPT chunk
• ability to write NFS wwww files
• Other game formats

Documentation

• https://3dodev.com
• https://3dodev.com/documentation/file_formats
• https://3dodev.com/documentation/development/opera/pf25/ppgfldr/ggsfldr/gpgfldr/3gpg
• https://3dodev.com/documentation/development/opera/pf25/ppgfldr/ggsfldr/gpgfldr/5gpg
• https://3dodev.com/documentation/development/opera/pf25/ppgfldr/ggsfldr/gpgfldr/00gpg1

Other Links

• 3DO Dev Repo: https://3dodev.com
• 3DO Disc Tool: https://github.com/trapexit/3dt
• 'Modern' 3DO DevKit: https://github.com/trapexit/3do-devkit