path: root/TODO

Here is a list of things we plan to do in the future. Note that we
don't promise to do any of these, nor when we will do them. It's just a
list of what we hope to be able to do one day.

If you want to dig in, this is the stuff where you might make the most
useful contribution. Note that this list is never complete, and may be
partially outdated, so just because you don't see something here doesn't
mean it is not important.

Before you start work on something, you might want to talk to somebody
from the team. This will help us to prevent double work, i.e. several
people working on the same stuff at once without knowing about each
other.

Finally, always make sure to check out our bug tracker and our feature
request tracker for things that need work.


#######################################################################
# Docs, Web site
#######################################################################

General
========
* Add more Doxygen comments. However, quality is preferable over quantity
* Add port specific user documentation (dreamcast/palm especially). That
  would include things like:
  - How to use ScummVM on system XYZ
  - Which Palm / WinCE devices will run ScummVM, which definitely will not
    run it (or with which limitations)?
* Update/enhance man page
* Write a high level overview of how ScummVM and its engines work?

README / Manual
===============
* Ender is working on a new multi-format manual/readme.
  Since so far we haven't seen anything of that, Fingolfin has started a
  DocBook based manual (and FAQ, and Developer's Guide). You can find it in
  the CVS module "docs".
  Finally, there is a LaTeX based version of the README in the "doc" subdir
  of the "scummvm" CVS module, but it tends to slip out of sync with the
  plain text README, and it's not really a manual, it's just the README
  in a different file format.
* Everybody is welcome to start helping out with the public manual project
  in the "docs" CVS module. You can either reuse content from the README,
  or replace it with new, better written stuff. Contact Fingolfin or our
  mailing list, scummvm-devel, if you are interested in helping out.
* Would be nice to have a HTML version of the README on the web page (and I
  don't just mean a big <pre> section; rather I mean "real" HTML with links
  and lists and tables etc.)
* It would be greate to have a "Developer's Guide to ScummVM" which explains
  the ScummVM framework, and also the engines, i.e.
  - stuff in common/, like the config manager etc.
  - the backend API, and how to create new backends
  - the sound system
  - how to create a new engine
  - a chapter for each engine, with as many/little details as the resp.
    engine teams deem appropriate...
  - ...


Web site
========
* Add the "Manual" / README to the site
* Redo the screenshots. Mostly this means adding more (and maybe removing or
  replacing a few). What I have in mind are that we follow these guidelines
  (which aren't set in stone nor laws, just guidelines :-)
  - For each unique game, provide 2-3 screenshots
  - Have at least one shot for each major variant of a game (with major variant
    I mean visibly distinct versions, like Zak V1 vs. V2 vs. FM-TOWNS; or
    Monkey Island EGA vs VGA vs CD).
  If I am counting right, that should place us at about 2*(18+2+1+1+1)=46
  screenshots, compared to the current 32 (and more if we start adding HE
  games).

#######################################################################
# Common code, infrastructure
#######################################################################

General
=======
* Revise the way "quit" is handled. Maybe add a global variable "g_quit" which
  we set when the application should be quit (e.g. when an EVENT_QUIT is
  received). This is useful if multiple levels of event loops have to be ended
* Fix the Map<> template, make it more robust; maybe use a red-black tree?
* Instead of the above, consider switching everything over to the STL.
  Maybe a little bit more overhead, but we get instant access to a full-featured
  and well-tested code base, with everything we need.
* Make some generic "EventLoop" API/class which all backends and the GUI
  use. Initially this would just call the backend poll_event() etc. methods.
  But eventually the EventLoop object(s) could be made by the backend.
  This may allow for more efficient CPU usage etc.
  The current event handling model essentially is polling: the engines run
  some kind of main loop, which, besides many other things, also polls and
  dispatches events. The idea is to turn this around: the event loop
  frequently gives the engine time to do these "other things".
* Try to reduce the memory footprint of the MPEG player. Right now it allocates
  an 8 MB lookup table for YUV->RGB conversion. Perhaps we could borrow some
  code from SDL's software implementation of YUV overlays. (It might even be
  possible to expose some of SDL's YUV overlay API as an optional part of the
  backend, but I don't know enough about it to get it to work. We'd still need
  our own implementation as a fallback, though.)
* Make the autosave interval configurable (via GUI, command line, config file).
* Maybe add ways to modify the game configs via the command line. E.g. allow
    ./scummvm --add new_target --path=/foo monkey2
    ./scummvm --remove new_target
* Maybe allow launching games even if no target is specified? I.e. the user
  only has to specify a path (or run ScummVM from the right directory), and
  ScummVM auto-detects the game in that location
    ./scummvm --auto-detect
  Of course, if we do it, it has to be done so that the launcher is still
  reachable :-)

Build System
============
* Add test(s) for backend usability in the configure script.
* Enhance the Makefile-based build system to support VPATH and stuff, so that
  one can compile scummvm in a directory tree separate from the source tree.
  That would make it possible to build ScummVM with different build options,
  e.g. have one debug build and one optimized build.
  Fingolfin implemented most of this; the only thing missing is that configure
  should detect when it is run in a directory outside the source tree, and in
  that case generate a custom Makefile, with content like this:
	srcdir = /path/to/source/dir
	vpath %.cpp $(srcdir)
	vpath %.h $(srcdir)
	include $(srcdir)/Makefile
* Allow automatic re-runs of configure (this would have to 'save' the values of
  env vars like CXXFLAGS and also command line params)
* Add an install target to the Makefile - Copy binary, install manpage, add
  menu items, install README. See also patch #891909 (Gnome/KDE .desktop file)

Audio
=====
* Get the high quality resample code to work
   [Fingolfin has started work on this]
* Consider changing the mixer volume to use range 0-255, for sake of
  consistency (but at a slight loss of efficiency). Note that this requires
  changes in at least rate.cpp and mixer.cpp.

Config Manager
==============
* Add a 'notification' system. E.g. the SoundMixer could request to be notified
  whenever the value of the "volume" config option changes. In other words,
  instead of a "pull" approach (where each subsystem has to check whether any
  config option relevant to it has been changed) we use a "push" approach.
  Of course the current approach is "push", too: whenever e.g. the volume
  setting is changed, the code doing so has to updated the SoundMixer etc.
  That's cumbersome, and error prone. Would be much nicer if updating the
  volume config value automatically notifies the SoundMixer, iMuse etc.

Files
=====
* Add a FilesystemManager or FileManager or so which should unify and/or
  replace the current File/FilesystemNode classes (and maybe SaveFileManager).
  The goal is to make these things as portable as possible while keeping it
  easy to use for the coder. Some new functionality we need:
  - check for existence of file/directory
  - check whether given directory is readable/writeable
  - convert FSNode into a string representation (for prefs file)
  - convert said string representation back to FSNode
  Of course that can be added w/o a FileManager class, too - but it might be
  nice to have all of these integrated.

GUI
===
* Remove hard coded 320x200 assumptions, use game screen size
* EditableWidget: Make it possible to specify a min/max length for the text
* EditableWidget: Let setEditString filter the string it gets
* EditableWidget: Right now, custom filtering requires the user to subclass;
  it would be nice if there was simply a "validator hook" or so.
  Maybe take some inspiration from Java's Swing in this matter.
* Improve EditTextWidget::drawCaret and ListWidget::drawCaret support for alternate
  fonts (the current code overdraws chars partly, and relies on the fact that
  our default built-in font has a separation pixel column on the *left* side;
  most other bitmap fonts have it on the right, though). To this end, we maybe
  should backup the background before drawing the caret, and restore it when
  erasing the caret.
* Add a new "options" dialog which is used by all frontends: for this, we'd
  agree on a hotkey used in all engines to invoke that dialog; it would sport
  settings for the volume, graphics, paths, etc.; it would co-exist with the
  engines "native" option dialogs.
  The about dialog would be reachable from here, too, as well as a quit button.
  Justification: This ensures that all settings are really reachable from
  all of the engines, which is not the case currently.
  Problem: It's not fully clear to me how to "best" deal with global vs. local
  settings here...
* Maybe add the ScummVM logo (+typeface?) to the about dialog

Launcher
========
* Add more options to global options dialog
* Add more options to game target options dialog 

Plugins
=======
* Add a plugin API that allows querying a plugin for the savegames associated
  with a given game; that is, you pass the name of a target from the config
  to the plugin, and it returns a list of savegames. How that list would look
  like exactly is debatable; but it should be possible to extract a user
  friendly name; a slot ID corresponding to the "-x" command line param;
  and possibly a filename.
  Justification: This API would make it possible to directly load savegames
  from the launcher.
* This savegame API could return additional (optional) information for each
  savegame entry: name; creation date; thumbnail screenshot
* When building with the fake static plugins: instead of hardcoding the list
  of plugins, plugins should automatically be "hooked in". This can be achieved
  by modifying REGISTER_PLUGIN to insert special code into the plugins.
* Likewise, when building with real dynamic plugins: instead of hardcoding
  plugin names and pathes, we should scan in specific locations for all
  available plugins, etc.. For example, try to load all "plugins/lib*.so"
  files. To this end consider special file names for the plugins
* On OSX: Support a plugin build in the bundle target: *.plugin files should
  be put into ScummVM.app/Contents/PlugIns/; this also means that the loader
  needs to search in the plugin dir of the active bundle. So use the 
  CF bundle API, inside a #ifdef MACOSX block.


#######################################################################
# Engines / frontends
#######################################################################

General
=======
* Fix engines so they clean up after themselves, to allow proper re-entry
  to the launcher. See "FIXME: LAUNCHERHACK" in base/main.cpp

SCUMM
=====
* Make it possible to restart games properly
* Add method of setting initial debug channels from command-line
* Possible implement a new resource manager, which then also could be shared
  by ScummEX. [Jamieson has some ideas about this and might work on it]
* Figure out how to extract resources from Apple II and Commodore 64 versions
  See also <http://www.mts.net/~kbagnall/commodore/scumm/> for some notes on
  the SCUMM C64 disk format.
* Figure out how to extract resources from Turbografx/PC Engine version of Loom
* Indiana Jones and the Last Crusade EGA: Add inventory support for Macintosh version
* Loom EGA: Add support for music and sound effects in Macintosh version
* Add support for NES version of Maniac Mansion
* Add support for handling Kanji in FM-Towns games (foreground is rendered on a
  second plane at 640x480), text uses Shift_JIS encoding
  [implementation now that currently depends on font rom, not needing the rom
   would be preferable]

* Add support for TFMX music format in Amiga version of Monkey Island 1
  Check http://darkstar.tabu.uni-bonn.de/~neo/audio.html for music format
  details
* Compare codec 44 algorithm (For nut fonts) against COMI disassembly. The 
  current code isn't based on disassembly and doesn't always calculate decompressed 
  data size correctly.
* Humongous Entertainment Games
  - Add proper handling of sound looping in Humongous games
  - Add sound pitch support for piano keys in piano mini game of fbear (DOS)
  - Add rename/delete file support, to make file opcodes function correctly
  - Fix nukeArrays, it is nuking wrong arrays in stopObjectCode() sometimes
* Humongous entertainment >= v7 titles:
  - Add support for palette slots (_numPalettes * 1024) in HE99+ games.(For ff5demo/freddicove)
  - Add mask support to akos codec32, charset shouldn't be drawn under moving actors
  - Add support for song sync. in HE80+ games. (Used in ff2-demo/freddi2/pajama)
  - Add support for SBNG sound resources for songs (Used in ff2-demo/freddi2/pajama)
  - Add support for processWizImage mode 6 (For lost/smaller)
  - Add support for processWizImage mode 9 (For freddicove/bb2demo/footdemo)
  - Add support for additional drawWizImage flags (cyx)
  - Add shadows support for akos codecs in HE90+ games, uses XMAP resources.
  - Add arrayOps case 127 (For chase/lost/smaller/bb2demo/footdemo).
  - Add support for array sorting (Used in lost/smaller).
  - Fix actor glitches in pajama2
  - Fix cursor transparency in puzzle of pajama2
  - Fix sprites graphical glitches
  - Fix inventory background/items disappearing in puttzoo/zoodemo/putttime/timedemo
  - Add support for o90_getPolygonOverlap case9 (Used in lost/smaller)
  - Add support for o90_getPolygonOverlap case10 (Used in Caramel Pit of pajama3)
  - Add support for floodState (For puzzle in pajama2)
  - Add support for o80_unknownE0 (For binoculars in pajama2 and black board in freddi2)
  - Add support for various new opcodes

Broken Sword 2
==============
* Enforce ScummVM code formatting guidelines. (Mostly done?)
* Encapsulate the code into sensible objects. (Partly done.)
* Enable the CD swapping code. (Partly done.)
* Fix the credits so they look more like the original. (Did we ever get the
  source code for that?)
* Eventually I would like to get rid of the "driver" sub-directory. We already
  have a cross-platform infrastructure for ScummVM, so this separation is not
  necessary.

SIMON
=====
* Add support for auto decrunching the gameamiga file of demo version of Simon
  the Sorcerer 1 (Amiga) via decrunch_file_amiga()
* Add support for dictionary files in Amiga and Macintosh versons of
  Simon the Sorcerer 2
* Add support for Protracker music format used in Amiga versions
* Add support for drawing main graphics correctly in Amiga versions

SAGA
====
- legacy items -
 * Remove any traces of the additional level of abstraction reinherit used
 * Remove homerolled high level data structures like stacks that should
   be provided by ScummVM if they aren't already.
 * OO'ify (blah_mod.h contains public stuff, blah.h private stuff) [almost
   done]
 * rand() -> rnd.getRandomNumber()

- bugs/misfeatures -
 * Make actor animation Event-driven. See FIXME in actor.cpp. Maybe it
   should be INTERVAL_EVENT
 * No script func should use ScriptDataWord directly. All of them should
   be converted to appropriate data types via getTYPE() functions
 * Fix the usage of Rect so that it's more consistent with the rest of ScummVM,
   e.g. a rectangle covering the entire ITE screen should have right=320 and
   bottom=200. (eriktorbjorn, partly - mostly? - done)
 * Inspect Font module - free memory, GameFontIds <-> FONT_ID
 * Walk bug. When announcer puts medallion on Rif he should go backwards
   instead of turning and walking faced to screen
 * In many places RSC_LoadResource() is called but memory is not freed
   afterwards, i.e. there is a huge leak
 * Optimize screen output. Now we blit whole screen for each frame.
 * When using the original XMIDI music resources, some songs play at the wrong
   speed. The worst example I've heard of this is the "Elk Fanfare" during the
   intro. It could be the meta events we don't handle, but at least the tempo
   event doesn't seem to make any difference. Maybe something in the data
   header instead...?
 * In the dog's castle at guards' room (scene_change 177 ang go down) subtitles
   aren't shown. In floppy version there is complete silence both textual and
   audial. Looks to me as if subtitles are drawn outside the screen. Are the
   coordinates calculated wrong, or should the text drawing code compensate?
 * Sound in old Win demo is all wrong -- either there is some unique sound
   format or I didn't guess it correctly
 * Up and down keys ('u' and 'd') in converse panel do not work properly

- plans -
 * Remove use of floating point, especially doubles.
 * Implement Verbs (h00ligan)
 * Implement ShowSaveReminder(), that is that diskette
 * Implement Save/Load
 * Finish inventory code
 * Implement ISO path finder
 * Hook conversations to scripts (partly done)
 * ISO - tile scene implementation
 * Puzzle

- features -
 * Add sound/voices compression. Should _considerably_ save space.
 * Add support for Mac versions. All data is in BE mode and structures are
   aligned. (h00ligan, partly done)
 * Support for later Win32/Mac/Linux demos where some scenes are substituted
   with LBM images, tables are in place.
 * Amiga ITE support
 * Support for Dream Guild's Mac ITE
 * Support IHNM

#######################################################################
# Backends
#######################################################################

General
=======
* Several of the backend factory functions take config parameters. It should
  be possible to get rid of those once the config system rewrite (see above)
  has been done. In that case, the backends simply can query the config
  manager for these parameters (or any others they might like :-).
* Change backends to directly access the config manager
* Add API to query backend for a list of available music engines
  Useful for Options dialog
* Sony PS2 Port
* EPOC32/Symbian port. Might be able to start based on existing P800 port,
  however that code seems to be old and would need extensive work to be
  usable in post-0.6.0 ScummVM. Note: NGage uses Symbian OS, too...
* MS DOS port using Allegro <http://www.talula.demon.co.uk/allegro/> and
  DJGPP <http://www.delorie.com/djgpp/> ?
* Intent <http://withintent.biz/> port (already done by David Given, merge?)
* Digita OS port? (play games on a select few digital cameras...)
  <http://digita.mame.net/reviews.htm>

X11 backend
===========
* Update it to support the latest OSystem changes
* Make it work with multiple bitdepths
* Add frills used by SDL backend like graphic filters usage and CD audio

#######################################################################
# Tools
#######################################################################

General
=======
* Try to unify the usage of the compression tools, where possible /
  necessary.
* Make compress_san use the common encoder "API" in compress.c
* Make compress_queen use the common encoder "API" in compress.c
* Add FLAC support to compress_sword1 (and the sword1 engine)
* Consider using library APIs to encode data, instead of invoking the
  lame/oggenc/flac binaries.
  Pro: Tighter integration, no need to create temporary files.
  Con: Requires the resp. libs/headers to be compiled in, and the resulting
       binary would only run if all needed shared libs are present 
       (unless we static link), whereas the current binary will work even
       if lame/oggenc/flac are missing

Descumm
=======
* Turn it into a library, to be used by a command line frontend (like now),
  ScummVM debugger, and ScummEX. Basically, the API could consist of a single
  function, which takes a pointer to a memory buffer, its length, the Scumm
  version and optionally a game id. Also, it would get a pointer to a print
  function (in the case of the CLI tool, print to stdout; for ScummVM, print
  to our GUI console; for ScummEX, append to some window/widget)
* Rewrite code to use 2 passes; first pass builds an intermediate graph, the
  second pass then tries to detect loops, break/continue statements etc.
* Proper implementation of o6_startObjectQuick decompilation (see comment in
  descumm6.c). May requre rewrite of core program logic