I reproduced the issue. It is caused by optional lines shader. Once the optional shader program is in use, no other shaders appear to produce any output. This is what is visible on your screenshot: only optional lines.
I do not see any particular reason for it to behave weird. Possibly this is due to opengl driver in linux chrome. Optional lines vertex shader uses more parameters than usual (4 <xyz> vector points instead of 1), and I know that at least one other configuration (safari@iPad) does not support it at all.
My reproduction setup: chrome@ubuntu 12.04.05 under virtualbox, fresh install.
I will try to figure out what is wrong and if it is possible make it working.
Any hints appreciated...
Regards,
Jakub
I do not see any particular reason for it to behave weird. Possibly this is due to opengl driver in linux chrome. Optional lines vertex shader uses more parameters than usual (4 <xyz> vector points instead of 1), and I know that at least one other configuration (safari@iPad) does not support it at all.
My reproduction setup: chrome@ubuntu 12.04.05 under virtualbox, fresh install.
I will try to figure out what is wrong and if it is possible make it working.
Any hints appreciated...
Regards,
Jakub