all of the changes

include/FluidSim/Desktop/OrbitCamera.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include "FluidSim/AudioProcessing.hpp"
+#include <SFML/System/Vector2.hpp>
+#include <algorithm>
+#include <cmath>
+namespace fluidsim::port::desktop {
+struct OrbitCamera {
+    Vec3 target{.12f,.25f,0};
+    float yaw{-28},pitch{24},distance{2.2f};
+    void reset(float aspect) {target={.12f,.25f,0};yaw=-28;pitch=24;distance=std::max(.65f,1.6f/aspect)/.414214f;}
+    void orbit(sf::Vector2i delta) {yaw+=delta.x*.35f;pitch=std::clamp(pitch+delta.y*.3f,-75.f,80.f);}
+    void pan(sf::Vector2i delta,float height) {
+        const float y=yaw*.017453293f,p=pitch*.017453293f,k=distance*.828427f/std::max(height,1.f);
+        target.x+=k*(-delta.x*std::cos(y)+delta.y*std::sin(p)*std::sin(y));
+        target.y+=k*delta.y*std::cos(p);
+        target.z+=k*(-delta.x*std::sin(y)-delta.y*std::sin(p)*std::cos(y));
+    }
+    void zoom(float delta) {distance=std::clamp(distance*std::exp(-delta*.12f),.35f,12.f);}
+};
+}