Identifying browser compatibility with thick WebGL lines

According to the documentation provided by three.js:

Due to limitations in the ANGLE layer, when using the WebGL renderer on Windows platforms, linewidth will always be set to 1 regardless of the specified value.

Wide lines may not work in certain browsers that do not utilize ANGLE, such as IE11

https://i.sstatic.net/t64In.png

This question discusses potential workarounds for this issue.

Is there a way to determine if the browser supports wide lines?

Answer №1

A parameter does exist for that specific purpose: ALIASED_LINE_WIDTH_RANGE. This query will provide a range of potential values for line width:

gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE) // yields [1, 1] on the device I tested it on

Answer №2

Just a heads up:

If you try to retrieve the line width range using

gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE)
, you'll get an array with minimum and maximum values, but in reality, only 1.0 is widely supported. This limitation isn't solely due to ANGLE.

Since OpenGL version 3.1, larger line widths have not been supported by OpenGL itself. According to the specification:

E.2.1 Deprecated ... Features

  • Wide lines - LineWidth values greater than 1.0 will result in an INVALID_VALUE error.

It's worth noting that this restriction applies to the core profile of OpenGL. Although you can utilize a "compatibility profile" to access wide lines and other older features, implementing WebGL2 necessitated sticking to the "core" profile, thus limiting support for line widths over 1.0.

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