stroboscope by Brainlez Coders!
# stroboscope - TIC-80 512b intro - Inércia 2022
This repository contains the unpacked source for the TIC-80 512b intro
"stroboscope", made by pestis / brainlez Coders! and released at Inércia 2022
512b compo.
Capture: https://www.youtube.com/watch?v=j5o7avY4vO4
Source: https://github.com/vsariola/stroboscope
Tested with TIC-80 1.0.2164 pro. Packed with
[pakettic](https://github.com/vsariola/pakettic). Music tracked with slightly
customized [crackle-tracker](https://github.com/vsariola/crackle-tracker).
Greets to psenough, jeenio, havoc, superogue, HellMood, jobe, nesbox, dave84,
TomCat, exoticorn, ferris, Jin X, ttg, unlord, gopher, okkie, ÅrÅola, hannu,
wrighter, Dresdenboy, aldroid, baze, noby, p01, PoroCYon, DevEd, byteobserver,
sensenstahl, Virgill, Ped7g, gasman, LJ, ilmenit, deater, Fready, Blossom and
everyone at the Sizecoding discord!
Technical:
- Clear screen, draw a black ball or bar, then draw the lights and the
scanning rectangle on top. The scanning rectangle is lame, but was added to
make the screen a bit more busy.
- Since there is nothing like a "blend mode" in TIC-80, a max-blending is
faked by drawing everything in order from darkest to lightest, so the
lightest colors appear on top.
- The light sources on the ball are distributed using fibonacci sphere
algorithm. But spiral slope (what normally should be the golden ratio) is
varied, so the first time you see the ball, the slope is 0 and the lights
are still in a straight line.
- Custom palette setting copy-pasted from my [Byte Battle
notes](http://www.sizecoding.org/wiki/Byte_Battle)
- The light sources rotate around the sphere, and the rather complex looking
math.min madness is just checking if the circle currently being drawn would
be obscured by the object; if so, then don't draw it. But the radius is
smoothly decreased when the light is starting to be obscured, so that the
lights don't suddenly disappear when going behing the object.
- The bars are just done just by setting the y-coordinate of all light source
to 0 (middle of the ball), and then drawing screen filling rectangles
instead of circles.
- The vertical vs horizontal bars are done by rotating the primitive drawing
by 90 degrees.
- The new thing added to crackle tracker was that the pattern note numbers are
from the diatonic scale, instead of semitones. `*12//7` maps note numbers from
the diatonic scale back to semitones.
- The "transpose" in crackle tracker is added before this mapping, so it
effectively is not just transposing a melody, but changing the mode the
melody is played in (some kind of... modal modulation I guess?). This allows
same melody sound e.g. major or minor, depending of the current mode.
Effectively, it's controlling how hands are moved left or right on the white
keys of the piano. The melody contains mostly notes 1, 3 and 5 of the scale
(and some passing notes), to better highlight the major/minor quality of the
mode.
- Additionally, instead of just moving hands, when changing the mode, we do
necessary inversions to the melody, to keep the keys used roughly in the
same octave as before the modulation.
License: [MIT](LICENSE)
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