PICO-8 : Fantasy console

[Yuki]

Of course execution speed depends of your computer, but yeah, the update and draw functions are called 30 times a second.

[Dream of Omnimaga]

Ok thanks. And there are timers, delay and wait commands to slow things down, right?

[Snektron]

Today i finally got around to downloading it, and it looks very cool. Is it possible to edit code outside of pico-8 btw?

[Yuki]

Yes, if you edit the .p8 file it should work.

[Snektron]

ah yes, i've found the "folder" command

[Dream of Omnimaga]

That's nice juju. Also is the music tracker built-in the software or is it a separate cartridge? And can music be edited outside PICO-8 such as Notepad?

[Yuki]

The music tracker is built-in.

[Dream of Omnimaga]

Cool to hear . I'll see if I can try making a song with it at some point.

[Siapran]

on an unrelated note, I found this:
https://gist.github.com/paniq/7814560e2b560b76911b

could probably be used for some fancy effects etc

[Snektron]

Oh cool. This is becoming like calculators where everyone is hacking it too to find secrets

[Siapran]

oh my god
I tried getting the code from a cart png with a text editor

I though it would just be some extensive metadata in the picture
I was wrong

the whole thing is encoded into the pixels themselves

[Snektron]

Whoa.... how did they do that

[Siapran]

I think each byte of the cart is spread on the last 2 bits of every channel:

take for instance, the keyword "local"

Code Select Expand

hex: 6c 6f 63 61 6c
binary: 0110 1100 0110 1111 0110 0011 0110 0001 0110 1100

now for a gray pixel on the png:

Code Select Expand

hex: 66 66 66 FF
binary: 0110 0110 0110 0110 0110 0110 1111 1111

now for each pixel, spread a char on the end of each channel:

Code Select Expand

binary:
0110 0101 0110 0110 0110 0111 1111 1100
0110 0101 0110 0110 0110 0111 1111 1111
0110 0101 0110 0110 0110 0100 1111 1111
0110 0101 0110 0110 0110 0100 1111 1101
0110 0101 0110 0110 0110 0111 1111 1100
hex:
65 66 67 FC
65 66 67 FF
65 66 64 FF
65 66 64 FD
65 66 67 FC

the color change is so subtle you can't even see it, but the data is still there
with a picture of 160*205, you have 32800 pixels, that makes 32K of data for a cart

[Snektron]

That's awesome I love these kind of hidden secrets

[Yuki]

Yeah, I looked at it the other day and found nothing. Thank you!