WebGPUAttributes: Improper 4-byte alignment computation.

[pplux]

I just noticed this:

three.js/examples/jsm/renderers/webgpu/WebGPUAttributes.js

Line 67 in 9ef27d1

const size = array.byteLength + ( array.byteLength % 4 ); // ensure 4 byte alignment

This doesn't yield a new size with 4 byte alignment ( for example 5 + (5%4) = 6) Usually you would do

 size = size + (4-size%4);

but again, this is wrong when size is already mod 4 = 0, so probably what you want to use is

size = size + (4-size%4) % 4;

[Mugen87]

Good catch! How about:

let size = array.byteLength;
size = size + ( 4 - ( size % 4 ) ) % 4;  // ensure 4 byte alignment, see #20441

Would you like to make a PR with the change?

[Mugen87]

BTW: This bug does not affect current demos 😇 .