Split Linux FPS title reporting

src/platform_linux/linux_platform_services.cpp

@@ -0,0 +1,35 @@
+#include "platform_linux/linux_platform_services.h"
+
+#ifdef __LINUX__
+#include <string>
+
+#include <GLFW/glfw3.h>
+
+#include "app.h"
+
+namespace pp::platform::linux {
+namespace {
+
+void linux_update_fps(int frames)
+{
+    App::I->title("PanoPainter - " + std::to_string(frames) + " FPS");
+}
+
+}
+
+void report_rendered_frames(int frames)
+{
+    linux_update_fps(frames);
+}
+
+}
+#else
+namespace pp::platform::linux {
+
+void report_rendered_frames(int frames)
+{
+    (void)frames;
+}
+
+}
+#endif

src/platform_linux/linux_platform_services.h

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace pp::platform::linux {
+
+void report_rendered_frames(int frames);
+
+}