Added convenient and efficient Timer class

The Timer is efficient because it does not depend on incrementing a
counter to keep track of time, nor does it call SDL_GetTicks every time
its state is checked (this happens once per frame instead).

Along with global functions Time::absoluteTimeMs() and
Time::deltaTimeMs(), this replaces previous globals tick_time, cur_time
and get_elapsed_time().

For now, there is still a fixed 100 times per second logic call rate,
but the new Time::deltaTimeMs() function should allow getting rid of
this.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/resources/ambientlayer.cpp b/src/resources/ambientlayer.cpp
index b292070b..a238afcc 100644
--- a/src/resources/ambientlayer.cpp
+++ b/src/resources/ambientlayer.cpp
@@ -34,8 +34,8 @@ AmbientLayer::~AmbientLayer() = default;
 void AmbientLayer::update(int timePassed, float dx, float dy)
 {
     // Self scrolling of the overlay
-    mPosX -= mSpeedX * timePassed / 10;
-    mPosY -= mSpeedY * timePassed / 10;
+    mPosX -= mSpeedX * timePassed;
+    mPosY -= mSpeedY * timePassed;
 
     // Parallax scrolling
     mPosX += dx * mParallax;