Certain hardware doesn't support WebGL precision highp fragment shader

[ozooner]

Version

2.0 beta

Test Case

Turns out certain hardware does not support WebGL precision highp float;
For given hardware shader with mediump or lowp works fine

Steps to reproduce

Amazon Fire TV stick Gen 2
CPU: Mediatek MT8127D 4x ARM Cortex-A7 @ 1.3 GHz
GPU: Mali 450 MP4

Expected Behavior

To render WebGL filters

Actual Behavior

[asturur]

oh well. how to detect that? will be mediump enough for filters? what can we really do with an amazon fire tv stick?

[ozooner]

Just a second, creating PR

[ozooner]

#4433

[ozooner]

So in my test case, only highp isn't supported, however there could be hardware that:

• doesn't support highp and mediump, only lowp
• passes the webGL support test, but doesn't support any precision

So the PR takes care of these hypothetical scenarios as well