December 1, 2022, 6:23am
@BabylonNative @Cedric @bghgary
I’m not entirely sure this is a bug, but it’s certainly a difference between Babylon.js and Babylon Native.
I was trying to get
@roland’s cool new greased line code working in Babylon React Native, but it kept crashing with the following error (in Android):
After much trial and error investigation using one of the simplest of Roland’s tests (
pbrDemo()), I was able to determine that
attribute float side was the cause of the crash. This
side vertex buffer is defined and populated in
It works after changing from a
float to a
vec2 throughout like so:
Sorry for the mess of screenshots above, but hopefully it conveys the issue.
Is this a known limitation of BGFX or a bug?
December 1, 2022, 9:36am
It was not a known limitation but at the same time, I’m not really surprised. It’s an uncommon case with just 1 float attribute. It’s never been tested AFAIK.
I’m opening an issue for that.
crash with 1-float attribute vertex stream · Issue #1175 · BabylonJS/BabylonNative · GitHub
December 1, 2022, 9:37am
@Cedric! Much appreciated.
After doing some investigation on this, it turn out the problem is not the float vertex buffer. For some reason glslang does not parse a vector multiplication by a float correctly.
If “attribute float side” is used to create a vector “vec2 sideV = vec(side, side);” and than used for multiplying the other vectors it works properly.
I will do some more investigation to see if the was eventually fixed in a more recent version of glslang.