Syncing was already incomplete (e.g. decoding takes more than one
frame and delays can happen in this case). Giving up syncing audio
timer and game timer should not affect the game experience so much.
Instead, clock implementation will be much simpler.
Before this change, the audio is suspended when the game stops for
1/12[s]. However, as game often stops for more than 1/12[s]
especially on mobiles, this implemntation caused some audio
glitches.
This change fixes this problem by re-implementing suspending/
resumeing audio by detecting the window is active/focused or not.
Actually, at least 704d4cf464,
examples/moire doesn't work well without roundTexel on MacBook Pro.
However, now other parts are fixed (e.g. highp is used), it looks
like roundTexel is no longer needed.
Some pretty old machines don't support OpenGL 3.x or later, and in
such environment, some framebuffer functions like glGenFramebuffers
are not available. Instead, EXT versions can be used even on
machines that don't support OpenGL 3.x.
After this change, Ebiten always tries to use EXT version of
framebuffer functions. I believe EXT version is always available
when non-EXT version is available, so this chang eshould be safe.
Fixes#602
nosync package for GopherJS is problematic since nosync's mutex
assumes that Lock call is never duplicated, which is not true in
actual applications.
See also #603.
nosync package is good in terms of performance, but this assumes
that duplicated lock never happens. As audio package runs multiple
goroutines, theoretically duplicated lock can happen, and it looks
like this is an actual case (#603).
This change replaces nosync usages with regular sync usages.
Probably I'll deprecate nosync usages via internal/sync package
everywhere in Ebiten.
This might fix#603.
