tecznotes

Michal Migurski's notebook, listening post, and soapbox. Subscribe to this blog. Check out the rest of my site as well.

Mar 19, 2012 4:00am

tinkering with webgl

With some help from Ryan and Tom, I’ve been wrapping my pea-sized brain around WebGL. I’m doing my usual start-from-the-bottom thing so it’s been a great exercise in understanding a programming paradigm built around static lists and buffers. I’ve worked like this before, but not extensively and not with a render output this smoking fast.

It’s all simple stuff so far, but I’m chasing two ideas: using WebGL for simple 2D output with an added speed bump, and driving it from SVG or the HTML DOM. None of the examples below will work unless you’re using a current WebGL-compliant browser, which for me was Chrome 17.

The elephant is me figuring out the basics of viewport transformations that match pixel positions, image textures, and simple animation passed via vertex buffers:

The monkey is a test to see how many things I can throw around on a screen without sacrificing framerate, as well as some sanity checks on coding style. Turns out, the answer is “lots”. Interesting things happen with this one when you switch to and from its tab; I’m using a basic timeout-based mechanism for the little face particles, and it clearly falls into a regular rhythm.

The unicode patterns (borrowed from Sarah Nahm) are governed by an invisible D3 force layout, and are a test of synchronization between multiple “programs” and driving a visual effect from a geometric layout. Also additive blending for punchiness. Try dragging the boxes:

These are some of the resources I’ve been using to get up to speed:

I’m still not totally comfortable with the programming approach of maintaining collections of static lists in preference to objects and other data structures, and I’ve been avoiding three.js until I can get comfortable with how WebGL works for simple, two-dimensional graphics. No lighting effects or spinny statues quite yet.

February 2017
Su M Tu W Th F Sa
   
    

Recent Entries

  1. things I’ve recently learned about legislative redistricting
  2. oh no
  3. landsat satellite imagery is easy to use
  4. openstreetmap: robots, crisis, and craft mappers
  5. quoted in the news
  6. dockering address data
  7. blog all dog-eared pages: the best and the brightest
  8. five-minute geocoder for openaddresses
  9. notes on debian packaging for ubuntu
  10. guyana trip report
  11. openaddresses population comparison
  12. blog all oft-played tracks VII
  13. week 1,984: back to the map
  14. bike eleven: trek roadie
  15. code like you don’t have the time
  16. projecting elevation data
  17. the bike rack burrito n’ beer box
  18. a historical map for moving bodies, moving culture
  19. the other openstreetmap churches post
  20. platforminess, smartness, and meaningfulness

Archives