129 lines
4.0 KiB
Plaintext
129 lines
4.0 KiB
Plaintext
# intro to uxn programming workshop
|
|
|
|
online workshop to learn the basics of {uxn} programming
|
|
|
|
# upcoming
|
|
|
|
=> https://withfriends.co/event/13004513/babycastles_academy_intro_to_uxn_programming Babycastles Academy: Intro to Uxn Programming
|
|
sunday, november 21, 12021, at 3pm UTC-5 (EST)
|
|
|
|
# description
|
|
|
|
Have you wondered how computers function under layers of abstraction? Are you curious about learning about assembly languages? Would you like to try fun challenges, while getting to know a permacomputing platform? Join us in learning about Uxn!
|
|
|
|
Uxn is a portable 8-bit virtual computer inspired by forth-machines, capable of running simple tools and games, and programmable in its own unique assembly language called Uxntal.
|
|
|
|
Uxn is at the core of Varvara computer, a platform for running small audio/visual applications. Varvara has been ported already to several years old and modern computing platforms, like the Gameboy Advance, Nintendo DS, the Playdate, and more.
|
|
|
|
In this workshop we'll introduce the basic concepts to start programming this computer: its architecture, the programming paradigms of Uxntal, and some low-level aspects that will allow us to create a simple drawing tool!
|
|
|
|
Pre-requisites: This workshop is best for those with some previous programming experience. However, no previous experience with assembly or low-level computing is needed.
|
|
|
|
We will use the learn-uxn website by metasyn, that requires a web browser with javascript enabled:
|
|
=> https://metasyn.github.io/learn-uxn learn-uxn
|
|
|
|
# outline
|
|
|
|
## 1) uxn, varvara, and its architecture
|
|
|
|
* what is uxn, varvara, uxntal?
|
|
* varvara computer architecture
|
|
|
|
## 2) uxntal basics
|
|
|
|
* the stack and postfix notation
|
|
* hexadecimal
|
|
|
|
## 3) drawing into the screen
|
|
|
|
* setting system colors
|
|
* uxntal labels
|
|
* drawing a pixel
|
|
|
|
## 4) sprite drawing
|
|
|
|
* designing a sprite
|
|
* drawing a sprite
|
|
|
|
## 5) interactivity loop
|
|
|
|
* draw loop: on-screen vector
|
|
* reading the mouse
|
|
|
|
## 6) conditional behavior
|
|
|
|
* a small conditional example
|
|
* more possibilities
|
|
|
|
# links and resources
|
|
|
|
## for the workshop
|
|
|
|
=> https://metasyn.github.io/learn-uxn/ learn-uxn by metasyn
|
|
=> https://wiki.xxiivv.com/site/uxn.html uxn technical documentation
|
|
=> https://wiki.xxiivv.com/site/uxn.html varvara documentation documentation
|
|
=> https://akkartik.github.io/mu/tutorial/converter.html decimal to hexadecimal converter
|
|
=> https://100r.co/site/nasu.html 100R - nasu spritesheet editor
|
|
=> ./hexadecimal.gmi {hexadecimal}
|
|
|
|
## and more
|
|
|
|
=> ./uxn_tutorial.gmi {uxn tutorial}
|
|
=> https://wiki.xxiivv.com/site/uxntal_reference.html the uxntal opcode manual
|
|
=> https://wiki.xxiivv.com/site/uxntal_cheatsheet.html uxntal cheatsheet
|
|
=> https://git.sr.ht/~rabbits/uxn uxn repository
|
|
=> https://llllllll.co/t/uxn-virtual-computer/ llllllll forum
|
|
=> https://github.com/hundredrabbits/awesome-uxn awesome uxn: awesome things from the community
|
|
=> https://100r.co/site/uxn.html 100R - uxn
|
|
|
|
irc channel: #uxn on irc.esper.net
|
|
|
|
# example program
|
|
|
|
```
|
|
( simple drawing tool )
|
|
|
|
( devices )
|
|
|00 @System [ &vector $2 &pad $6 &r $2 &g $2 &b $2 ]
|
|
|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 ]
|
|
|90 @Mouse [ &vector $2 &x $2 &y $2 &state $1 &wheel $1 ]
|
|
|
|
( init )
|
|
|0100
|
|
@on-reset
|
|
( set system colors )
|
|
#0a6f .System/r DEO2
|
|
#05cf .System/g DEO2
|
|
#0caf .System/b DEO2
|
|
|
|
( configure screen device )
|
|
;on-frame .Screen/vector DEO2
|
|
;brush .Screen/addr DEO2
|
|
BRK
|
|
|
|
@on-frame
|
|
( read mouse coordinates )
|
|
( and use as screen coordinates )
|
|
.Mouse/x DEI2 .Screen/x DEO2
|
|
.Mouse/y DEI2 .Screen/y DEO2
|
|
|
|
( read mouse state and compare for left click )
|
|
.Mouse/state DEI
|
|
#01 EQU ,&draw JCN ( jump when mouse is pressed )
|
|
BRK
|
|
|
|
&draw ( draw sprite: 4-fg, 5-color1 and alpha )
|
|
#45 .Screen/sprite DEO
|
|
BRK
|
|
|
|
( sprite data )
|
|
@brush 3e7e ffff ffff 7e3c
|
|
```
|
|
|
|
# support
|
|
|
|
if you enjoyed this workshop and found it helpful, consider giving us your {support} :)
|
|
|
|
=> https://www.patreon.com/compudanzas compudanzas on patreon
|
|
=> https://ko-fi.com/compudanzas compudanzas on ko-fi
|