Implement gravity

src/Game.zig

@@ -51,6 +51,7 @@ timer_left_arr: Timer,
 timer_left_das: Timer,
 timer_right_arr: Timer,
 timer_right_das: Timer,
+timer_gravity: Timer,
 
 pub fn init(renderer: *SDL.SDL_Renderer) Self {
     var ret = Self{
@@ -67,6 +68,7 @@ pub fn init(renderer: *SDL.SDL_Renderer) Self {
         .timer_left_das = Timer.init(200),
         .timer_right_arr = Timer.init(50),
         .timer_right_das = Timer.init(200),
+        .timer_gravity = Timer.init(200),
     };
 
     // Get a piece from the bag
@@ -140,6 +142,19 @@ pub fn tick(self: *Self) State {
         self.timer_down.stop();
     }
 
+    // Gravity
+
+    if (!self.piece.timer_dropped.started) {
+        if (!self.timer_gravity.started) {
+            self.timer_gravity.start();
+        } else if (self.timer_gravity.finished()){
+            self.action_list[@enumToInt(ActionCode.down)].activate = true;
+            self.timer_gravity.start();
+        }
+    } else {
+        self.timer_gravity.stop();
+    }
+
     // DROP
 
     if (self.piece.dropped) {

src/Timer.zig

@@ -22,6 +22,11 @@ pub fn start(self: *Self) void {
     self.initial = SDL.SDL_GetTicks64();
 }
 
+pub fn unstop (self: *Self) void {
+    self.started = true;
+
+}
+
 pub fn finished(self: *Self) bool {
     if (self.started) {
         self.progress = SDL.SDL_GetTicks64() - self.initial;