Repro'ed the webgl issue with this helper script:

const TEXT = '!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~';

async function stress() {
  for (let fr = 0; fr < 256; fr += 2) {
    for (let fg = 0; fg < 256; fg += 2) {
      for (let fb = 0; fb < 256; fb += 2) {
        console.log('\x1b[H\x1b[2J\x1b[mThis should be readable with white FG color.');
        console.log(`r: ${fr} g:${fg} b:${fb}`);
        console.log(`\x1b[38;2;${fr};${fg};${fb}m${TEXT}`);
        await new Promise(r => setTimeout(r, 20));
      }
    }
  }
}

stress();

The canvas renderer does not suffer the same, but errors out much later with:

Seems the atlas page merge tries to do a [4096, 4096, 4096, 4096] --> 8192 page transition, but fails on that. Whats really weird - a few lines above in the log there are those [512] and [512, 512] entries, with only one resp. 2 pages to merge, which def. wont work in a quadmerge. (The log entries are from console.log(mergingPages.map(p => p.canvas.width)); as first line in TextureAtlas._mergePages).

Idk yet what this error is about, seems the texture atlas is really broken at that stage. A quick fix could just clear the whole atlas at a certain threshold, before it runs into the corrupted state.

render issue on very high atlas pressure #4534

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