La forêt de Castle of Illusion ?

C'est l'histoire d'un screenshot qui arrive juste pendant que je réfléchis à décorer un peu mieux ma "green zone". Il aurait mérité d'être avec d'autres dans la section "études pour dessiner des arbres dans mon jeu" ... ou pas. C'est un screenshot de Castle of Illusion sur MegaDrive, mais pas ce niveau qu'on a tous vu, non le suivant. Celui qu'on coupe au montage. Celui où il va falloir éviter de tomber dans le vide et éviter de se manger les araignées ... 

C'est Régis Monterrin qui avait attiré mon attention dessus avant que je ne note des bizarreries dans les tiles, un peu comme si l'artiste avait fait un chouette truc puis que l'outil pour exporter son travail avait buggé et que personne ne s'en était rendu compte.

Parce que bon, on a tellement de carrés répétés indépendamment de la texture, de transition brutale entre palettes de couleurs aux frontière de la grille-de-tiles que ça en devient presqu'un contre-exemple de pixel-art, où les spécialiste vous donneraient des astuces pour éviter qu'on ne remarque que tout n'est que carrelage aligné sur une grille.

En fait, au fil de l'évolution de ma "green zone", je suis passé par un état un peu de ce genre et j'ai noté que ça me faisait inévitablement penser à ce jeu C64: Forbidden Forest. (et sa suite, sur le screenshot)

Forbidden Forest, c'est le jeu qu'il vaut mieux ne pas regarder de trop près. Alors ok, pour un jeu de l'époque 8 bits, avec un maximum de 256 caractères à l'écran alors qu'il y a place pour plus de 1000 d'entre eux, c'est le truc le plus organique et le plus varié que vous puissiez faire. Là où l'état de l'art, ce sont les écrans interchangeables de "Pitfall" ou la répétitivité de Wonder Boy, ici, on est sur un scrolling continu d'arbres tous différents les uns des autres ... mais aussi sur une omni-présence de l'angle droit.

C'est là qu'est intervenu Aurélien Simon:

Tout ça disparaissait sur un bon vieil écran CRT évidemment. Juger du graphisme de cette époque sur un LCD n'a pas de sens, puisqu'ils étaient créés sur et pour le CRT 

J'avoue que j'avais un peu de mal à y croire. Que le côté "patterns bizarre" du tramage ne pose pas de soucis, oui. Mais ces gros pavés ? ces lignes horizontales et verticales quasi-continues se feraient adoucir rien que par le balayage ?

J'ai cherché un peu sur youtube, des fois que quelqu'un aurait effectivement joué à ce jeu sur tube cathodique ... c'est un des niveaux qu'on avait fait avec J.L.N lors d'un "ludifestival", mais à l'époque, manette en main, on faisait bien sûr beaucoup plus attention aux feuilles-plateformes-géantes qu'au décor. Pas de chance, la seule vidéo que j'aie trouvé, c'est celle ou le joueur a coupé cette séquence au montage.

Mais pendant ce temps-là, Aurélien, lui, avait ressorti son bon vieux Phillips et sa méga-drive et re-joué à Castle of Illusion jusqu'à ce niveau-là pour refaire un screenshot (non?) réaffiché l'image de Régis pour la prendre en photo.

Et là, il faut bien reconnaître qu'à part la ligne horrizontale à hauteur du pied de Mickey, sur la gauche, ça donne plutôt propre. Ni les joueurs ni les testeurs de l'époque n'ont dû y trouver à redire.

Bon, fondamentalement, ça ne change pas grand-chose en ce qui me concerne: puisque mes pixels à moi vont être sur la NintendoDS, je n'aurai pas de flou gaussien pour venir à ma rescousse :P 

autocrlf

I have a git folder that is accessed both by a windows host and a linux guest from a VM (as a shared folder). Everything was fine until some git package upgrade started warning about "in the working copy of 'project.txt', LF will be replaced by CRLF the next time Git touches it" (or the equivalent from the Linux guest).

I'd like to avoid cloning the repository twice and I already have something that makes these file LF-only on the master repository. I set autocrlf = false in .git/config, but that does not seem to help.

The manpages of git are heavy, freaky and intimidating to say the least. But I guess if I had rtfm'd them, I'd have eventually encountered the git config --show-origin --get-all core.autocrlf command, which conveniently reports all the files where the given configuration item. I'd have figured out that while I had my local configuration file requiring "do not do auto-CRLF conversions", the system-global configuration actually had the precedence. ... ridiculus, but that's the way it is now.

git check-attr -a project.txt and git ls-file --eol project.txt could be useful to check the current state as well.

With autocrlf=false in Git/etc/gitconfig, I don't have the warnings anymore, but I still have the file that is switching between CRLF and LF depending on whether Windows host or Linux guest is checking it out. It looks like the only way to get the desired behaviour is to edit * text=auto eof=lf in .gitattributes, at the root of the repository. I want that to remain a local decision, and hopefully, my colleagues haven't committed that file yet, so that'll work.

What's wrong with Gimp ?

 J'avais jusque là la 3.0.6 sur la machine windows du bureau ... qui m'a déplu sur plusieurs aspects. Petit tour d'horizon avant de passer à 3.2.4

• sauf que tout à coup, c'est la 3.2.2 qui s'ouvre !?
• les niveaux de zoom sont devenus beaucoup plus étalés, notamment quand on zoome avec CTRL+roulette ... au point que avoir un 200% ou un 300% "propre" pour une capture d'écran de pixelstudy devenait impossible sans aller entrer la valeur à la main. 3.2.2 corrige ça en permettant de monter à 33, 50, 66.6, 100, 150, 200 avec les raccourci clavier "+" et "-"
• changer de couche avec PG up et PG down ne permettait que de sélectionner la couche, pas de l'activer pour les opérations de dessin et de copier/coller. c'est corrigé avec 3.2.2 

Est-ce que je deviens chèvre ? Non. C'est le nouvel outil de sécurité du boulot qui fait les mises à jour dans notre dos. Sans avertissement, sans résumé d'opérations. Rien.  

Restait le panneau d'impression qui indique maintenant "pas de prévisualisation possible". Un comble pour un programme de dessin ! Un petit tour dans la base des registres pour ajouter PreferLegacyPrintDialog=(DWORD)1 sous Computer\HKEY_CURRENT_USER\Software\Microsoft\Print\UnifiedPrintDialog et on revient à quelque-chose de moche, mais utilisable.

Un TEDS ? Enfin ?

Quelques semaines avant de partir me reposer un peu, j'ai voulu faire un test de "3 rooms" sur ma DS. Pas de chance, il manquait une ligne - une seule - au fichier script sur la DS, de sorte que le fichier en question ne se lançait pas. Du coup, quand je me suis retrouvé assis tranquilou à une terrasse, je suis revenu sur cette idée d'éditeur de texte pour la DS.

I really could use a text editor running on the DS, to patch those script files without having to 1) turn the cube on; 2) stick the WiFi in; 3) setup upstream/downstream channels; 4) beam file out; 5) patch it in vim; 6) beam it in again; 7) try and most likely repeat from 4. And I did have a couple of hours by the swimming pool, sitting at a table to think how to approach it.

Et après quelques notes sur comment l'éditeur pourrait fonctionner, je retombe sur cette idée de "mode scribouille" qui me hante depuis 8 ans ... pour finir par me rendre compte que le meilleur programme pour tester le système, c'est celui qui permettrait d'encoder les patterns de chaque lettre. 

Et donc, après quelques petites opérations de maintenance, je lance une nouvelle branche pour prototyper ça , un peu patraque dans mon fauteuil et pas franchement d'attaque pour grand chose d'autre.

Of course, it wouldn't take long before I tried to inject the "handwriting for DS" technique into it, and I realised something interesting: the "minimal viable product" to see whether I can truly write stuff with that technique is 80% of what we need to populate the recognition data. So after more ndsdev in a row that I've been doing over the last few months, I made a first version of "teds", working enough to decide that, yeah, it's kinda-working. 

Je pourrais baptiser ça "un marathon ndsdev", avec son lot d'essai-erreur, de petites étapes prudentes et de passage par DDD pour me rendre compte que j'ai utilisé la mauvaise variable dans l'itération d'une boucle ^^".

J'ai maintenant une sorte de "minimal viable product" qui permet de tracer des lettres et d'effacer l'une ou l'autre lettre d'un L+LEFT. Assez pour constater que 

• des cellules de 4x4 pixels, ce n'est pas convaincant, vu les imprécisions du tandem stylet/DS
• une "zone morte" en bordure de cellule permet effectivement de faire des "diagonales" de façon plus fiable
• il reste souvent nécessaire de faire des "retouches" pixel par pixel
• tracer les lettres d'un traît ou tracer les lettres "tranches de pixel par tranche de pixel" donne grosso-modo la même vitesse d'écriture: 30-32 secondes pour "there is no spoon" (16 caractères avec les espaces)  

Next step will be storage and loading of the "recognition database" and selection of a "bank" of 8 characters to "train" from the ASCII set shown on the left of the screenshot.

 

Foreground for the underground ?

Something is annoying me with the underground section of the green zone levels: it's too repetitive. It shows in every screenshot I try to make. I have variation tiles that could make it less uniform, but they don't really work if we repeat them. I have plans for a background, parallax layer underground, but it only really works in open environments, not in tunnels, and underground areas are mostly made of tunnels. in the Green Zone.

But those funny pillars might work as foreground  layer as well! Maybe even better because they're bigger than the pebbles repeating tile of ground I have. They would focus the gameplay in a smaller part of the level just like a circle-of-light would, but with something pleasant to look at. The question is, how can I make it indeed focusrather than obscure. I don't want to make Infogramish game where you don't see where you're heading to because of the foreground.

Let's ask Bouli to make a bit of math, here: if my foreground layer advances by e.g 3 pixels everytime my regular layer advances by e.g. 2 pixels, then I just have to make a map that is 3:2 bigger than the playfield if I want to follow things properly.  

I mean, my "foreground" map would be drawn over a 150% zoom up of the main map, and that should be it. At least, that's the intuition. How to confirm it quickly ? Well, how about cutting some paper to make a live overlay and make it move around. Of course, you have to consider that only a part of the result will be shown to the player, too.

Does that mean I need a special mode or a variant of the Level Editor ? ... maybe not. At least, not more than "use the "physical" layer of gac.map (move by 2:3) and let me edit gacfg.map on top of that.

The fun trivia here, is that the initial motivation was to find a way to have VRAM for textures now that I know it does not require palette slots. But while comparing the options, I came to the conclusion that I had no real use of 3D in the green zone anyway, except maybe to render more trees in the background... but checking Case Portman's Lost in Fuzz video, I realised that proper amiga-style parallax would work better than any 3D and would be easier to make here. And yes, I'm only using 2 tilesets out of the 256K allocated to the background tiles in Dreamland, so I could fit a 3rd one and another "infinimap" in the unused space ...

Does it means textured 3D becomes out of reach ? No, but that Bilou's Dreamland will sometimes use 3D, sometimes not (plain 3D does not require more VRAM, but it consumes one layer).

Does it means Yoshi-Island-Style dual screen action should be forgotten ? No, but it would only work in levels where we have no 3D objects and no fancy lush background/foreground maps.

Does it mean having Bouli or another character "telling the story" on one screen while Bilou is "living the action" on the other impossible ? No, but Bouli may have to survive within 16K of sprite VRAM, using DKC-like live-update techniques for his animations.

edit: sidequest finding: shifting extended palettes from 64K to 16K VRAM isn't that trivial to do. (but not required unless we want to texture 3D stuff)
 

Better THROWN->ROLL transitions

 Since the introduction of the appleman ROLL mechanics, there was something I couldn't completely fix: if you managed to throw the appleman straight into a "jump thru" platform, it would stop as if it was a wall, while you'd expect it to roll over the platform or fall through it instead.

I envisioned a number of solution to this problem until I realised there was one quite obvious one: just bounce the appleman upwards a little bit when that happens. It will then be able to advance sufficiently into the platform so that it is then in the normal "thrown->roll" transition. If instead it was thrown into a solid wall, the bounce will be visible, but have no lasting effect

And let's be honest: it would have been a nightmare to debug without the recently introduced GobExpression debugger. You can quite easily end up in a situation where you expect some speeds to have been non-null in some condition and realise that, well, no they're null here.

The alternatives I had envisioned were globally more complicated, like holding the speed for some time and then restoring it. More complicated in the sense that they required introducing new states in the behaviour or even new controllers. Here, it's just one extra transition that says "stay in THROWN state if {conditions}, but update velocities as follows"
 

NDS for DSi

I had announced on some discord channels that I had a new NDS demo of my ongoing work. One of these channels is the one where I'm in touch with Fei, who already tried a copy of the 3-rooms demo back in 2021 and 2023.

Back then, we finally managed to have something running at his place, but it doesn't seem it has been preserved. After locating a register that could tell me whether we're running on DSi (and then skipping the InitGBA function that would blue screen the demo -- as there are no GBA memory around), the best I could get is a "EFS search failed" message, but also a mention that 1) DLDI is around but 2) the demo is installed on Fei's SD card rather than in the filesystem.

Bad news is that I don't see anything in libfat or in libnds that would enable DSi' SD card access, which goes through completely separate hardware and isn't covered by DLDI at all (to my best knowledge). I'm not the only one to have such problems, but there was no answers to be found.

So I guess my best move to make progress there is finally to get homebrew software running on my own DSi thanks to StyleHax...  for that, the next step was to enable a DNS server on the cube. That sounded like a task the rubber duck could take care of and it suggested the following: 

Use a small local DNS resolver (dnsmasq or unbound) bound to the interface and configure only the few hosts to use it via per-interface/etc resolver settings or systemd-resolved split DNS. Since you want minimal config/deps on Ubuntu 18.04, dnsmasq is simplest.

• Edit /etc/dnsmasq.conf (or add /etc/dnsmasq.d/custom.conf) and add: 
• interface=eth1 # replace with your interface name 
• bind-interfaces # ensure dnsmasq binds only to listed interface 
• listen-address=192.0.2.10 # IP of that interface (optional, stronger) 
• no-resolv # avoid reading /etc/resolv.conf 
• add local hostnames: address=/host1.example/192.0.2.101 address=/host2.example/192.0.2.102 

ok, fine. That allowed me to fake some website with some other DNS name, and eventually get stylehax page shown on the DSi, even once making a green screen (exploit worked, but boot.nds was missing) and once loaded the dumptool.nds, but it complained the SD card was too small (it's a 128MiB one) and refused to do anything. Each attempt takes 1-2 minutes, and I'd say the success rate is at best 1:10.

One of my ideas was to use e.g. runME as boot.nds and work directly from there, but from this experience, it doesn't seem to be a viable plan ...  

Maybe I should pay a closer look to the updated nds_loader ? 

Maybe I should check the way GetDeviceOpTab is implemented and try to write something that reports all available devices ? (alt. repo from Patater)

Or maybe I should simply use another hack ? like the Memory Pit for the camera application ? 

edit (25/5): Got lucky with stylehax this morning: every boot.nds made it through in 1 or 2 attempts. So I managed to get DLDI scanning of Dreams-inspector.twl.nds and figured out I had to fix my Makefile to apply efstool processing over that new .twl.nds as well ^^. And eventually, I got Dreamlands 3-room demo running on my own DSi !_!