freds72 [Lexaloffle Blog Feed]

Invalid pre-processing of ternary

Fri, 30 Jun 2023 19:46:49 UTC

How to reproduce

execute code:

print("a")
(nil or print)("b")

outputs:

A
runtime error line 1 tab 0
print("a")
attempt to call a number value
at line 1 (tab 0)

note that print("a") is correctly executed regardless of the error being reported on that line!

Workaround

print("a")
local fn=nil or print
fn("b")

cstore() to p8.rom filename saves png

Sun, 05 Feb 2023 13:32:46 UTC

Expected:

-- save to p8.rom format
cstore(0,0,0x4300,"test.p8.rom")

Outcome (bug): test.p8.rom is actually a png file!!

0.2.5d _env syntax error

Tue, 13 Dec 2022 19:27:36 UTC

The _env (lower case) keyword is no longer supported:

example cart: https://www.lexaloffle.com/bbs/?tid=48907

likely a general bugs on upper/lower case remapping.

some p8scii string won't copy to clipboard

Sat, 20 Aug 2022 13:38:10 UTC

Marking as resolved - this is a "feature" of printh to stop at \0.
Solution to export p8scii to clipboard is given here: https://www.lexaloffle.com/bbs/?tid=38692

Repro cart:

haguramako

by freds72

[Click to Play]

Outcome:

p8scii correctly copies bytes on screen
bug: clipboard gets only a truncated command (should be 612 chars)

Note: works as expected if background is not 0

inconsistent poke 0x5f56 rules

Thu, 16 Dec 2021 07:51:26 UTC

The new poke to set map start cannot be applied to 0x20.
eg:

— does nothing :[
poke(0x5f56, 0x24)

for small maps, the 0x2000 ‘hardware’ map area cannot be reached in full:

— hw map
poke(0x5f56, 0x20)
— say tiles are starting after a large 32x32 map
— set width
poke(0x5f57, 2)
— yikes, cannot set y offset (>256)
poke(0x5f3b, 32*32\2)

Totally Accurate Holiday Bowling

Tue, 14 Dec 2021 06:16:11 UTC

Holiday season, stuck at home waiting to open presents?
Despair snow more, a play of totally accurate bowling will enjoy the day!

freds72_bowling

by freds72

[Click to Play]

Devlog

Codebase expands from Ghost Rally, no longer limited to a single dynamic/static response.
Collision hulls are limited to solid rectangles to benefit from simplified overlapping tests and clipping maths.
The whole engine could be plugged into any 3d engine if you don't mind the staggering token cost :/

Sources are available at: https://github.com/freds72/chamboultout

The game went through multiple iterations (initial idea was a "chamboultout"), including odd things like:

or a "Santa Bombers"!

Changelog

1.1 fixed: invalid "spare" message when producing a strike

Credits:

Physic code & articles by Randy Gaul: qu3e
Physic articles & talks from Dirk Gregorious: Contacts Talk
Radix sort by James Edge ( @jimmi)
Secret Discord team ( @Jusiv, @markgammed...)

POOM

Sun, 05 Dec 2021 13:04:52 UTC

poom_0

by freds72

[Click to Play]

BBS Edition to celebrate year 1 of POOM release!
(limited to 1 level - sorry!)

Enjoy full game at: https://freds72.itch.io/poom

Controls

Alternate scheme (select from controls menu):

Devlog

Game is "multi-cart", using 0x8000 region filled with raw data from 2 carts (poom_0+poom_1).

Engine details: https://freds72.itch.io/poom/devlog/241700/journey-to-poom

Credits

Art+Design+Music: @paranoidcactus
Code: @freds72

Changes

added: Jelpi Spotter credit :)

tline incorrect rendering on slanted lines

Sun, 20 Jun 2021 08:25:03 UTC

See repro cart - unless I am totally wrong on my software tline, pico8 tline ("hw tline") is not correctly rendering lines with arbitrary slopes.

Software version eventually converge toward correct pattern, tline does not.

rikegukawu

by freds72

[Click to Play]

Unable to detect keys mapped to accentuated character

Fri, 09 Apr 2021 20:06:41 UTC

stat(31) fails to report any key mapped to an accentuated character (ex: on AZERTY keyboard, 2 is mapped to key "é").
It prevents support for diverse keyboard layouts.

Suggest to have a raw keyboard stat value to report key number.

goyonusuha

by freds72

[Click to Play]

menuitem function ignored if game doesn't have a _update loop

Fri, 01 Jan 2021 14:16:53 UTC

How to reproduce:

register custom menu entry
run game with an endless while/flip loop

bug: menu item code is never triggered

gijenijato

by freds72

[Click to Play]

Feature request: keyconfig api

Wed, 16 Dec 2020 08:31:24 UTC

It is not possible to present actual keys being used by pico in game.
Pico8 keyconfig can be used to remap keys.

Proposal:

keyconfig id [player]
returns the character being used for button id and player (default 0)

[multicart] Pause resets screen palette

Mon, 14 Dec 2020 20:57:32 UTC

How to reproduce:

launch cart
set custom screen palette:

pal({140,1,139,3,4,132,133,7,6,134,5,8,2,9,10},1)

load data:

reload(0,0,0x4300,"cart2.p8")

while data gets processed, hit "pause"
bug: screen palette gets reset

Can be reproduced on POOM on the loading screen (https://freds72.itch.io/poom)

headless export bugs

Sat, 31 Oct 2020 14:01:28 UTC

Using -export command to automate multi cart package building and blocked by a number of bugs:

unable to specify HTML plate path (only works if export is actually performed from home folder)
inconsistent path parameters between bin and html exports:

# works for html
pico8.exe carts\cart_0.p8 -home . -export "game_alpha.html -p my_plate cart_1.p8 cart_2.p8"
# doesn't work for bin
pico8.exe carts\cart_0.p8 -home . -export "game_alpha.bin cart_1.p8 cart_2.p8"
# works for bin
cd carts
pico8.exe cart_0.p8 -export "game_alpha.bin cart_1.p8 cart_2.p8"

incomplete js generated unless export is run from carts folder

# produces broken js
pico8.exe carts\cart_0.p8 -home . -export "game_alpha.html -p my_plate cart_1.p8 cart_2.p8"

thick line routine

Wed, 29 Jul 2020 16:32:40 UTC

Thick line drawing routine (as a reply to @JadeLombax Twitter).

rabogemeri

by freds72

[Click to Play]

Manual:

linefill x0 y0 x1 y1 r [col]
draw a 2*r pixel wide line
note: r must be >= 0.5 to produce meaningful results
note: the code uses sub-pixel precision rasterization, allowing smooth movement

Example:

-- 4 pixel wide white line
linefill(45,34,67,96,2,7)

tline incorrect clipping

Fri, 24 Apr 2020 12:30:10 UTC

introduced in 0.2.0d
how to reproduce:

call tline with a start point outside of screen boundaries
tline starts at 0 without adjusting lookup coordinates

repro cart:

kuwirapima

by freds72

[Click to Play]

Unable to draw after mouse pan

Fri, 17 Apr 2020 15:52:20 UTC

How to reproduce:

switch to spritesheet
select pen tool
draw
middle-mouse click to pan
draw does nothing outside the initial zone

nil not handled as zero in bit operators

Fri, 17 Apr 2020 07:07:52 UTC

How to reproduce:

-- outputs zero
local b=band(nil,4)
-- throws error (arithmetic on field ?)
local b=nil<<4

info + #include reports random figures

Fri, 17 Apr 2020 07:00:23 UTC

How to reproduce:

cart with 3 includes

#include includes/bold.lua
#include includes/bigscore.lua
...
some other code
...
#include includes/tquad.lua

reports invalid 'printb' not found (included in bold.lua)
info produces random output:

ctrl-r clears the error and runs the cart ok

bit operators without assignment bogus syntax error message

Fri, 17 Apr 2020 06:36:36 UTC

how to reproduce:

for i=1,n do
  i<<5
end

Output:

Repro cart:

towakowibo

by freds72

[Click to Play]

[request] Multicart on BBS

Wed, 04 Mar 2020 19:53:52 UTC

Multicart is really a nice expansion feature, to offer content beyond the 32K boundary.
However, with reload not supporting BBS-hosted carts, large games are banned from BBS.

Is that something considered in the pico roadmap to bring back multicart games to the "official" forums?

Note that supporting more than a couple of data carts will require rework of the BBS file management.

support for upload many files at once
support for listing cart identifiers
support for headless export of p8.png (limited to html/bin at time of writing)
ability to assign same id pattern to many carts (ex: vracing_0... vracing_10)

Cheers