Use a base multiplier to keep the existing option range (1-15).
SDL2 >= 2.18 allows for considerably smoother scrolling, but
basic support for earlier versions is included.
This hint was once needed because of the way we handled surfaces.
But as OpenGL already uses a hardware surface, we already had to
fix all the issues that comes with it. As that is generic code,
this hint is no longer actually needed. Further more, recent SDL
versions break because of it on Wayland.
When changing a Game Option and pressing Exit Game, the changes
were not actually stored. This because the post-mainloop code
was never executed for Emscripten.
Basically, we drop RelativeMode completely, and use the same trick
as used by the Windows driver: read all motion events till the last
one, and use that as value.
This allows drawing to happen while the GameLoop is doing an
iteration too.
Sadly, not much drawing currently can be done while the GameLoop
is running, as for example PollEvent() or UpdateWindows() can
influence the game-state. As such, they first need to acquire a
lock on the game-state before they can be called.
Currently, the main advantage is the time spend in Paint(), which
for non-OpenGL drivers can be a few milliseconds. For OpenGL this
is more like 0.05 milliseconds; in these instances this change
doesn't add any benefits for now.
This is an alternative to the former "draw-thread", which moved
the drawing in a thread for some OSes. It has similar performance
gain as this does, although this implementation allows for more
finer control over what suffers when the GameLoop takes too
long: drawing or the next GameLoop. For now they both suffer
equally.
Drawing in a thread is a bit odd, and often leads to surprising
issues. For example, OpenGL would only allow it if you move the
full context to the thread. Which is not always easily done on
all OSes.
In general, the advise is to handle system events and drawing
from the main thread, and do everything else in other threads.
So, let's be more like other games.
Additionally, putting the drawing routine in a thread was only
done for a few targets.
Upcoming commit will move the GameLoop in a thread, which will
work for all targets.
This makes it a bit easier to follow what is going on, and
allow future subdrivers to hook into a few of these functions.
Reworked the code slighly while at it, to return early where
possible.
The higher your refresh-rate, the more likely this is. Mostly you
notice this when creating a new game or when abandoning a game.
This is a bit of a hack to keep the old behaviour, as before this
patch the game was already freezing your mouse while it was changing
game-mode, and it does this too after this patch. Just now it
freezes too a few frames earlier, to prevent not drawing windows
people still expect to see.
Most modern games run on 60 fps, and for good reason. This gives
a much smoother experiences.
As some people have monitors that can do 144Hz or even 240Hz, allow
people to configure the refresh rate. Of course, the higher you
set the value, the more time the game spends on drawing pixels
instead of simulating the game, which has an effect on simulation
speed.
The simulation will still always run at 33.33 fps, and is not
influences by this setting.
Eri the Switch
Peter Nelson
Charles Pigott
Jonathan G Rennison
Fen
Rubidium
frosch
Patric Stout
glx22
Henry Wilson
Niels Martin Hansen
embeddedt
sean
Michael Lutz