pouët.net

Some technical info for TIC-80 coders:

Main idea: Merge a compute heavy effect with 60 fps stuff (incl. sound triggering)

Metaballs:

• simple raymarcher without perspective and with binary search for the surface, marching through a roughly 50x50 sized area (x by y, adapted individually based on comp. size and coverage of the metaball's movements)
  
• a simplified calculation of the surface normal (just in one plane)
  
• heavily relying on compression for repeated code parts (e.g. to juggle the center coordinates around) instead of adding more loops and using arrays
  
• color 0 has to be skipped due to the background color gradient
  
• as long as the used time in TIC() didn't reach some threshold, the calculation does another y-loop (was x before)
  
• a global variable keeps the current outer loop position to continue calculation during the next frame
  

Sound:

• the bassline reuses some part of the scroll text with modifications, which is played via sfx
  
• for some filter like effect, simple PWM is being used to modify the waveform
  
• sfx() in TIC due to the main effect staying in the frametime limit
  

Scroller:

• uses my font peek routine and is being plotted in OVR()
  
• seemingly the TIC-80 versions before 1.0-dev clear the OVR layer (which led to the glitch on the stream with 1.0)
  
• steps through palette via frame counter
  

Rasterbars:

• simply some nice gradient for color 0 done within SCN()
  

This intro had some visual glitches with the overlay on the live stream due to being run on a newer dev version of the TIC-80 client (1.0dev).