Split Apple platform target and move platform state ownership

src/app.h

@@ -77,6 +77,14 @@ struct VRController
     virtual float get_trigger_value() const { return 1.f; }
 };
 
+struct VrSessionSnapshot
+{
+    bool has_vr = false;
+    bool vr_active = false;
+    std::array<VRController, 2> vr_controllers{};
+    glm::mat4 vr_head{1.0f};
+};
+
 class App
 {
 public:
@@ -125,7 +133,6 @@ public:
     std::string doc_dir;
     std::string doc_filename;
     bool has_stylus = false;
-    bool has_vr = false;
     bool vr_controllers_enabled = true;
     float off_x = 0;
     float off_y = 0;
@@ -136,10 +143,7 @@ public:
     bool animate = false;
     bool ui_visible = true;
     bool ui_rtl = false;
-    bool vr_active = false;
     bool vr_only = false;
-    VRController vr_controllers[2];
-    glm::mat4 vr_head;
     float vr_pressure = 1.f;
     glm::mat4 vr_rot{ 0 };
     glm::mat4 vr_uirot{ 0 };
@@ -209,6 +213,7 @@ public:
     [[nodiscard]] bool platform_enables_live_asset_reloading();
     void update_platform_frame(float delta_time_seconds);
     void report_rendered_frames(int frames);
+    [[nodiscard]] VrSessionSnapshot vr_session_snapshot() const;
     void save_prepared_file(
         std::string path,
         std::string suggested_name,