gamax92 [Lexaloffle Blog Feed]

midi2pico by gamax92

Sat, 04 Feb 2017 17:46:29 UTC

Midi2Pico by gamax92

by gamax92

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Hello there, I've been working on this piece of software called midi2pico
It does what it implies, converts midis into music for pico-8

I've recently just added proper drum support, so in celebration of that I want to release this little demo.

Come checkout midi2pico at github: https://github.com/gamax92/midi2pico

It's a very configurable midi conversion program, with the ability to mute channels, change volumes, and to shift pitches to fit into pico-8's audio range. midi2pico attempts to arrange midi data in a logical way, storing the beginning of a song at sfx 0 and the end of the song near the end of available sfx.

MIDI Format 0, pitch bends, sfx deduplication, silence removal, and now drums are supported. A midi instrument and drum to pico-8 translation table is supported, though not very populated and most instruments use a default conversion. Look for 'Instrument to PICO-8 Map' and 'Drums to PICO-8 Map' inside midi2pico.lua

A separate utility is also included for debugging midi files called midi2note. midi2note shows the end result after midi2opus, opus2score, and score2note conversions that midi2pico also uses.

Installation is easy, all you need is lua 5.2 and the MIDI library, which is available in luarocks as 'luarocks install midi' or download the MIDI library directly here and place it along side midi2pico.lua

lua 5.1 is also supported, but you will need a bit32 backport which is also available in luarocks as 'luarocks install bit32'

Classic Screensaver

Thu, 05 Jan 2017 02:44:30 UTC

Classic Screensaver -1

by gamax92

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Working ALT Glyphs for 0.1.9 (Windows)

Thu, 29 Sep 2016 23:06:06 UTC

I did a small patch to SDL2 that should fix using the custom glyphs in 0.1.9, so until 0.1.9b is released this should suffice

This also fixes getting a ding/beep sound when trying to use the custom glyphs, the version of SDL2 that ships with PICO-8 is too old

Changed:

https://gamax92.keybase.pub/CustomSDL2.zip

No idea if this change adds in any issues but I've not been able to see any.

Ran PICO-8 on my phone

Sun, 19 Jun 2016 00:46:36 UTC

However, not in Android.

Got bored, set up Arch Linux ARM.
Got angry at freedreno Segmentation faulting.
Wasted several days compiling debugging versions of programs and trying to fix the crash.
Fixed freedreno (libdrm needs --enable-freedreno-kgsl)
Ran PICO-8:

Keyboard is the linux 'onboard' program, set to run on top of all other windows.
(Screenshot is resized, otherwise it would be absurdly huge due to my DPI)

(Renamed title to hopefully remove some confusion)

How to retrieve mouse coordinates (with demo)

Sat, 04 Jun 2016 16:17:25 UTC

Mouse Demo

by gamax92

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poke(0x5F2D, 1)

stat(32) -> X coord
stat(33) -> Y coord
stat(34) -> button bitmask (1=primary, 2=secondary, 4=middle)

You should probably limit yourself to using the primary button, not everyone has a middle mouse button and dunno how secondary button would work on a touch device. You should also be using the mouse to enhance a program, not for it to be the only control, or else you make it so anyone lacking a mouse on whatever device they're playing PICO-8 on is unable to use your cart.

EDIT: apparently it doesn't work that well on a touch device, atleast PocketCHIP:
"I tested the mouse support on PocketCHIP. It didn't work well. It seems to cannot detect mouse release (touch up)." ~ oinariman

A cheap way to do mouse press/release is to store the result of stat(34) in some variable at the end of the frame so that during the next one you can see if they differ and then respond on that.

Mostin's Meltdown

Sat, 21 May 2016 23:05:01 UTC

Mostin's Meltdown

by gamax92

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Mostin's having a Meltdown, can you help him locate his car keys?
He told me he lost them down out back near the barn gate, but that's a long long hike.
Over massive mountains and deep valleys, but it's all right, because he'll give you a pay of 60 Noblus!

Worth it, ... right? ... right? ...

EDIT: Alright, final p8jam2 version, I think I've gotten down what I wanted to accomplish.

Bad Apple v1.2.0

Wed, 27 Apr 2016 23:29:57 UTC

Bad Apple v1.2.0

by gamax92

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Old versions:

Decided to write an encoder for 128x128, 2 color, 1 pixel scrolling, and one rectangle per frame
After a bit of tweaking, it outputted this. Some parts of the video are entirely unrecognizable and just look like jittery boxes sure, but it's interesting.

Changelog:
v1.0.2:
Ignored the data for left and right scrolling, it's invalid.

v1.0.3:
Regenerated a new rectangles version with valid scrolling data + the extra tweaks.
8% better

v1.1.0:
Added circles
Fixed left/right pixel scrolling: the encoder was outputting garbage due to a typo.

v1.2.0:
Rewrote encoder in C
Added faster scrolling
Left space for music and sfx

Pico World 1.3

Fri, 18 Mar 2016 22:28:22 UTC

Pico World 1.3

by gamax92

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Old versions:

Pico World 1.2

by gamax92

[Click to Play]

Pico World 1.1

by gamax92

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Pico World 1.0

by gamax92

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It's a spinning globe.

Changelog:
1.3:
Brightened things up a bit!
Fixed a warping issue
Increased the horizontal resolution of the map
Added the vertical spherical distortion to go along with the horizontal

1.2:
Made the globe spherical

1.1:
Fixed the jittery issue

Rotating Textured Cube

Sun, 06 Dec 2015 16:27:37 UTC

Rotating Textured Cube

by gamax92

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Got bored and wrote a textured wall renderer.
If you really wanted to you could simply replace sspr with line and have a colored wall renderer.

Bomb Squad

Fri, 04 Dec 2015 21:53:44 UTC

Bomb Squad v0.0.2

by gamax92

[Click to Play]

Still working on it, but it's gotten to the point where all major features have been implemented and it's winnable.

Instructions:

(Havent worked on this in forever so might as well just move it to Cartridges, it's playable at the very least.)

Changelog:

Air Raiders

Sat, 21 Nov 2015 23:37:28 UTC

Air Raiders 1.0.2b

by gamax92

[Click to Play]

AIR RAIDERS
The object of the game is to blast enemy aircraft out of the sky... and dodge ground missiles!!! Zero in on enemy planes! Bank left, bank right, dive, climb out! Watch your elevation! Keep track of the fuel! Run out of ammo...land and refuel...take off again!

For Your PICO-8 Video Game System
You should download and play it though, the web player seems to break some minor things.

Changelog:

Older Versions: