extract orbital camera into separate file

src/camera.cpp

@@ -0,0 +1,80 @@
+#include "camera.hpp"
+
+auto OrbitCamera3D::Update(const Vector3 &current_target) -> void {
+  Vector2 mouse = GetMousePosition();
+  if (mouse.x >= GetScreenWidth() / 2.0 && mouse.y >= MENU_HEIGHT) {
+    if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) {
+      dragging = true;
+      last_mouse = mouse;
+    } else if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
+      panning = true;
+      target_lock = false;
+      last_mouse = mouse;
+    }
+  }
+
+  if (IsMouseButtonReleased(MOUSE_RIGHT_BUTTON)) {
+    dragging = false;
+  }
+  if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) {
+    panning = false;
+  }
+
+  if (IsKeyPressed(KEY_L)) {
+    target_lock = !target_lock;
+  }
+
+  if (dragging) {
+    Vector2 dx = Vector2Subtract(mouse, last_mouse);
+    last_mouse = mouse;
+
+    angle_x -= dx.x * ROT_SPEED / 200.0;
+    angle_y += dx.y * ROT_SPEED / 200.0;
+
+    angle_y = Clamp(angle_y, -1.5, 1.5); // Prevent flipping
+  }
+
+  if (panning) {
+    Vector2 dx = Vector2Subtract(mouse, last_mouse);
+    last_mouse = mouse;
+
+    // float speed = PAN_SPEED;
+    float speed;
+    if (IsKeyDown(KEY_LEFT_SHIFT)) {
+      speed = distance * PAN_SPEED / 1000.0 * PAN_MULTIPLIER;
+    } else {
+      speed = distance * PAN_SPEED / 1000.0;
+    }
+    Vector3 forward =
+        Vector3Normalize(Vector3Subtract(camera.target, camera.position));
+    Vector3 right = Vector3Normalize(Vector3CrossProduct(forward, camera.up));
+    Vector3 up = Vector3Normalize(Vector3CrossProduct(right, forward));
+
+    Vector3 offset = Vector3Add(Vector3Scale(right, -dx.x * speed),
+                                Vector3Scale(up, dx.y * speed));
+
+    target = Vector3Add(target, offset);
+  }
+
+  if (target_lock) {
+    target = current_target;
+  }
+
+  if (mouse.x >= GetScreenWidth() / 2.0 && mouse.y >= MENU_HEIGHT) {
+    float wheel = GetMouseWheelMove();
+    if (IsKeyDown(KEY_LEFT_SHIFT)) {
+      distance -= wheel * ZOOM_SPEED * ZOOM_MULTIPLIER;
+    } else {
+      distance -= wheel * ZOOM_SPEED;
+    }
+  }
+  distance = Clamp(distance, MIN_CAMERA_DISTANCE, MAX_CAMERA_DISTANCE);
+
+  // Spherical coordinates
+  float x = cos(angle_y) * sin(angle_x) * distance;
+  float y = sin(angle_y) * distance;
+  float z = cos(angle_y) * cos(angle_x) * distance;
+
+  camera.position = Vector3Add(target, Vector3(x, y, z));
+  camera.target = target;
+}