Pico-8 is a virtual machine and fantasy console for making, sharing and playing tiny games. Users create "cartridges" through a Lua-based environment.
Here is the Pico-8 homepage: https://www.lexaloffle.com/pico-8.php
Questions tagged [pico-8]
27 questions
3
votes
1 answer
Pico-8 coroutines are occasionally dead
I was trying to replace a for-loop with coroutines to move the stars:
--fine
function _update()
for c in all(boids) do
move_boid(c)
end
end
--broken
function _update()
for c in all(boids) do
coresume(cocreate(move_boid),c)
end
end
Notice…
knh190
- 2,744
- 1
- 16
- 30
3
votes
1 answer
Deserialization of simple Lua table stored as string
I'm transfering a lua table literal in a string from a web application in to PICO-8 that I'm trying to deserialize back in to a lua table in PICO-8.
The string is in the form '{"top", {"one", {"one a", "one b"}}, {"two", {"two a", "two b"}}}'
To try…
K Groll
- 518
- 2
- 8
- 18
2
votes
1 answer
Getting error "Attempted to index global 'table' (A nil value)" Lua
When I run this code snippet in Lua (using PICO-8 if it helps)
a = {}
table.insert(a,1,'foo')
I get the error
Attempted to index global "table" (a nil value)
According to the Lua website, this should work (https://www.lua.org/pil/19.2.html).
What…
SealProgrammer
- 75
- 1
- 7
2
votes
0 answers
Buildroot for pico-8 on raspberry pi0w keyboard input issue
I have been tinkering around with buildroot to try to put together an image with wifi and ssh support and is able to run Pico-8.
I'm really close and have everything running successfully, but Pico-8 is not accepting keyboard inputs. I'm sure it's…
itsonlym3
- 21
- 2
2
votes
1 answer
Lua)) how to loop table of table and get a specific property?
I am really newbie in lua. I have this lua code
local gun_info = {
g_sword={rate=0.5;spd=0;dmg=1;ammo=1;};
g_pistol={rate=0.5;spd=5;dmg=1;ammo=40;};
g_knife={rate=0.8;spd=5;dmg=1;ammo=1;};
g_shuriken={rate=0.3;spd=5;dmg=1;ammo=40;};
…
javaprogrammer
- 105
- 1
- 2
- 11
2
votes
1 answer
Modifying a Linked List With a Function in Lua
My question is regarding the below code snippet:
function add_node(list, v)
list={next=list, val=v}
end
function print_linked_list(list)
local l=list
while l do
print(l.val)
l=l.next
end
end
root=nil
root={next=root, val=0}
add_node(root,…
Colin
- 23
- 4
2
votes
1 answer
IF ELSE IF END gives Unclosed Function error
I am looking at PICO-8 for the first time.
This simple IF statement give me the error "UNCLOSED FUNCTION AT LINE 1".
function MYTEST()
local x = 1
if x==1 then
print("x==1")
else if x==0 then
print("x==0")
end
end
I admit the…
Rob O'Doherty
- 549
- 3
- 14
1
vote
2 answers
pico8 lua: unexpeted change of size of an array
I am seeing some unexpected behaviour when using a table as an array in pico8 lua when compared to regular PUC-Rio lua
If I run the following code using PUC-Rio lua5.4.4 (ubuntu)
local t={}
for i=1,10 do t[i] = i*10…
Oliver Schönrock
- 1,038
- 6
- 11
1
vote
1 answer
How can I fix this lua runtime error in pico-8?
I'm following your roguelike tutorial and have encountered a problem I do not know how to solve. This is my first-time coding with Lua
If r.nospawn then return 0
--Attempt to index local "R" (a nil value)
I asked the PICO-8 discord server, they…
user16475220
1
vote
1 answer
How to make score count go up by 1, everytime pset and sprite collide
So i'm new to programming and is currently trying out coding in pico-8.
I made the start to a game where the sprite is supposed to fall down from the top, and when colliding with my pset (point), i would like my score count to go up by 1.
As of now…
Trylle
- 13
- 2
1
vote
1 answer
Fields and methods of metatable are not visible on table right after setmetatable
This is Pico-8 lua. I have the following function, which fails at the marked assert. I do not understand how this can happen. I have used setmetatable on two other occasions and it is working there. I have no clue here.
function particle:new(o)
…
ziggystar
- 28,410
- 9
- 72
- 124
1
vote
1 answer
PICO8 - strange way to record HEX number
I am trying to understand how specific script (fade function) works in PICO8:
function fade()
fadep=split("0xffff.8,0xfffe.8,0xffec.8,0xfec8.8,0xec80.8,0xc800.8,0x8000.8,0x0.8")
for i=0,64 do
fillp(fadep[flr(i/(32/#fadep))+1])
…
wotesi
- 319
- 1
- 3
- 15
1
vote
1 answer
Wrong variable update in PICO-8
I was building a simple snake game from scratch as practice for PICO-8 and Lua.
I'm attempting to have the body follow the head by creating a copy of the old body locations and update along the length.
I created a t_old variable to store the…
Joseph Koch
- 13
- 2
1
vote
1 answer
PICO-8 Export Command in a GitHub CI/CD Pipeline
I'm working a small PICO-8 game that I am embedding into my website. There's an export command I use to create the game files for the web player, but I can only run this command locally in the PICO-8 application.
Is there any support to run this…
greg
- 1,118
- 1
- 20
- 40
1
vote
1 answer
PICO-8 making a button press show an output of text only once?
I'm a complete newbie to both Lua, PICO-8, and coding in general. I'm having trouble with a function I want to put in my first program. The text is all placeholder, I will change it once I get the code right and comprehend it.
Basically, before the…
B. Hoyt
- 15
- 6