Yep, the remaining issue seems to be these shader functions:
dFdx()
dFdy()
fwidth()
which are from GL_OES_standard_derivatives, that is not implemented by all drivers/platforms.
That shader code is not in Mir BTW. This bug no longer has anything to do with Mir since the first issue was separated into bug 1458689.
We need a fallback (or to avoid uncommon extensions) for the sake of portability.
Yep, the remaining issue seems to be these shader functions: standard_ derivatives, that is not implemented by all drivers/platforms.
dFdx()
dFdy()
fwidth()
which are from GL_OES_
That shader code is not in Mir BTW. This bug no longer has anything to do with Mir since the first issue was separated into bug 1458689.
We need a fallback (or to avoid uncommon extensions) for the sake of portability.