WS-LDN-5

Hi-performace Clojurescript w/ thi.ng, WebGL, Web Workers, WebSockets & asm.js

Repository

git clone git@bitbucket.org:postspectacular/ws-ldn-5.git

Will be moved to GitHub later…

Day 1

Overview

• CLJS requires different optimization strategies than Clojure
• Focus on CPU-bound issues
• Hard time limits due to human perception & UI usability
• Graphics, especially if animated, often high computational demands

ex01 - Game of Life

• basic demo of idiomatic CLJS code performance
• various ways of optimizing
• benefit from constrained mutability
• intro to typed arrays, benefits

Also:

• use thi.ng/domus for easy (non-React) DOM creation/manipulation
• use thi.ng/strf for string formatting / parsing

Source

ex02 - SVG visualizations & animation

• SVG is powerful, easy to generate, but highly inefficient for realtime
• Most geometry data only passed via strings (DOM attributes)
• Requires 2x work, 3x memory (lots of string concat, then parsing + rendering + compositing)
• Usually 2D only, but can use thi.ng/geom to render as 3D (w/ customizable shading)

Source

ex03 - WebGL basics

Source

WebGL & GLSL specs

• https://www.khronos.org/registry/webgl/specs/latest/1.0/
• https://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf

Day 2

Day 3