The implementation is buggy and not worth maintaining anymore
because performance benefits are not substantial or sometimes
worse. Also, removing it saves about 150 ~ 180 KB in binary size.
Below timings are averages of minimum 5 runs.
```
Device Init launch Average relaunch
s10 1129.8 ms 700 ms
s10 - binary 1346.75 ms 694 ms
Pixel 1692 ms 723 ms
Pixel - binary 1883 ms 1039 ms
Kazam 17948 ms 1339 ms
Kazam - binary 19157 ms 1564 ms
Wiko 2060 ms 1278 ms
Wiko - binary 3876 ms 1136 ms
```
Fixes#14294
In order to test the conversion from function to expressions using the
legacy tests in the expression test suite, parse function objects into
expressions in NodeExpression::Parse.
v2: Coding style fixes.
Refactor out HeadlessFrontend and HeadlessBackend gl independent code to gfx.
Define gl::HeadlessBackend as subclass, instantiated by gfx::HeadlessBackend static factory method.
GL dependent tests are still using gl::HeadlessBackend directly (not through gfx).
Add new APIs for invalidating tiles, effectively forcing Mapbox
GL Native to check with the servers if the tiles are valid before
using them. This is more efficient then deleting tiles, because
in case of valid tiles, they won't get downloaded.
Fixes#4376.
Remove re-linking programs as redundant.
It costs (cheaper to link once than twice) and (subjective) is not that common GL API
usage pattern, although perfectly legal and permitted.
Initial idea, behind the removed code, was to enable work on optimization
that would reduce number of attrib setup calls in case when VAO is not
available (as described in #9433).
As such optimization is not implemented, and it is arguable if it makes sense
to do it now, we can remove re-linking.
Related to closed PRs #9433 and PR #11583.
I have [measured the time spent just on relinking](https://gist.github.com/astojilj/29bd5a5c5dc0b2d9f29ecb660da07fbf) using release build on iPhone SE (A9, same as iPhone 6S):
- 1st run after reboot or installation
Total 37.14ms, average per program:1.86ms
- reopening
Total: 2.47ms, average per program: 0.12ms
This time we save using the patch here.
* [ios, macos] clarified documentation for newCamera in shouldChangeFromCamera
* [ios, macos] clarified documentation for newCamera param of the shouldChangeFromCamera delegate part 2
