fixes#838
instead of rendering ad libitum on the map thread, we are now driving rendering from the UI thread on iOS via the map.renderSync() function. There are still white bars during the rotation, but the general content of the view is kept visible.
- upgrades GLFW to 3.1
- removes swapped/needsSwap in favor of a more explicit scheme
- View#invalidate() now replaces View#swap() and is called whenever the View needs to trigger a rerender. GLFW and Android to this right away, while iOS goes back to the main thread and does the Map redrawing as part of the GLKView update
- sets all iOS deployment targets to 7.0
- disables SQLite3 version check, since the library version changed on iOS 8.2
View::make_inactive() is called just before termination of the
rendering thread. The implementation must clear the thread's GL
context.
This ensures there is no context still bound to a thread during
GL shutdown. This is needed as GL will not actually delete a
context until it is not active on any thread.
Fixesmapbox/mapbox-gl-native#340
Conflicts:
common/glfw_view.hpp
include/llmr/map/view.hpp
test/headless.cpp
