Improve physical geometry, fluid solvers, audio, and profiling

include/FluidSim/Desktop/PlaybackControl.hpp

@@ -0,0 +1,24 @@
+#pragma once
+#include <SFML/Window/Event.hpp>
+#include <algorithm>
+#include <cmath>
+namespace fluidsim::port::desktop {
+class PlaybackControl {
+public:
+    bool realtime() const {return realtime_;}
+    double target_speed() const {return realtime_?1.0:manual_speed_;}
+    bool handle_event(const sf::Event& event,bool shift=false) {
+        if(const auto* key=event.getIf<sf::Event::KeyPressed>()) {
+            if(key->code==sf::Keyboard::Key::Space){realtime_=!realtime_;return true;}
+            if(!realtime_&&key->code==sf::Keyboard::Key::PageUp){adjust(1);return true;}
+            if(!realtime_&&key->code==sf::Keyboard::Key::PageDown){adjust(-1);return true;}
+        }
+        if(const auto* wheel=event.getIf<sf::Event::MouseWheelScrolled>();wheel&&!realtime_&&shift) {adjust(wheel->delta);return true;}
+        return false;
+    }
+private:
+    bool realtime_{true};
+    double manual_speed_{1};
+    void adjust(double steps){manual_speed_=std::clamp(manual_speed_*std::exp(steps*.12),.0001,1.0);}
+};
+}