smooth scroll added

src/gameplay/core/Game.cpp

@@ -103,6 +103,24 @@ void Game::setPaused(bool p) {
     paused = p;
 }
 
+void Game::setSoftDropping(bool on) {
+    if (softDropping == on) {
+        return;
+    }
+
+    double oldStep = softDropping ? (gravityMs / 5.0) : gravityMs;
+    softDropping = on;
+    double newStep = softDropping ? (gravityMs / 5.0) : gravityMs;
+
+    if (oldStep <= 0.0 || newStep <= 0.0) {
+        return;
+    }
+
+    double progress = fallAcc / oldStep;
+    progress = std::clamp(progress, 0.0, 1.0);
+    fallAcc = progress * newStep;
+}
+
 void Game::refillBag() {
     bag.clear();
     for (int i=0;i<PIECE_COUNT;++i) bag.push_back(static_cast<PieceType>(i));