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. Music tracked with slightly customized crackle-tracker.
Greets to psenough, jeenio, havoc, superogue, HellMood, jobe, nesbox, dave84, TomCat, exoticorn, ferris, Jin X, ttg, unlord, gopher, okkie, Řrřola, 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
- 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//7maps 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
