<canvas webGL>

development

• Sensor security issues
• Dynamic flexbox canvas
• Double touch detection
• Rendering device-pixel resolution

Secure Context

Updating to iOS 12.3 from 11.4 disabled the deviceorientation event callback, due to fingerprinting attack vulnerabilities.

This was resolved by enabling a secure browsing context (https://), and by toggling the associated app sensor setting if using iOS Safari. There are no reportable errors if these steps are missed.

Whether the secure context actually protects you from attack may depend on how thoroughly the W3C security standard has been implemented.

Permission API

Updating to iOS 13.x disabled the deviceorientation event callback once again, due to renewed security concerns. Device sensors now require on-page button activation.

Update: 11/4/2021

Windows/Android are updating standards policy, breaking code.

Testing commences with Android Pixel 1.

permit sensor

(section)

• test main flex-section with flex-canvas

test D

• PEP: Pointer Events Polyfill for touch
• Seeded pseudo-random numbers
• Tetrahedral barycenter calculation

test C

• Orientation sensor data handling
• ECMAScript 6 class geometry generator
• sponge
• isolate canvas

test B

• Binding GLSL uniform struct params
• Matrix group: { proj, view, model, normal }
• JS API for directional light sources, fog
• isolate canvas

test A

• HTML and Context2D overlay text frames.
• WebGL 1.0 GLSL vertex and fragment shaders.
• Precision planar z-buffer calculations.
• Two-sided multi-source lighting, depth attenuation.
• isolate canvas

scratch space

Mozilla source
test_webgl_tut2.js

basic gl test

A black rectangle.