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Add: draw the screen at a steady pace, also during fast-forward

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During fast-forward, the game was drawing as fast as it could. This
means that the fast-forward was limited also by how fast we could
draw, something that people in general don't expect.

To give an extreme case, if you are fully zoomed out on a busy
map, fast-forward would be mostly limited because of the time it
takes to draw the screen.

By decoupling the draw-tick and game-tick, we can keep the pace
of the draw-tick the same while speeding up the game-tick. To use
the extreme case as example again, if you are fully zoomed out
now, the screen only redraws 33.33 times per second, fast-forwarding
or not. This means fast-forward is much more likely to go at the
same speed, no matter what you are looking at.
This commit is contained in:
Patric Stout
2021-02-17 15:04:46 +01:00
committed by Patric Stout
parent 5bfa014505
commit c81c6e5eb7
9 changed files with 117 additions and 99 deletions
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3
src/video/sdl2_v.h
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@@ -64,7 +64,8 @@ private:
std::chrono::steady_clock::time_point cur_ticks;
std::chrono::steady_clock::time_point last_realtime_tick;
std::chrono::steady_clock::time_point next_tick;
std::chrono::steady_clock::time_point next_game_tick;
std::chrono::steady_clock::time_point next_draw_tick;
int startup_display;
std::thread draw_thread;