Function drawFps

TheForceEngine/TFE_FrontEndUI/frontEndUi.cpp:546–574

	}

	void drawFps(s32 windowWidth)
	{
		const u32 windowFlags = ImGuiWindowFlags_NoNav | ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoInputs | ImGuiWindowFlags_NoSavedSettings;
		static f64 _fpsAve = 0.0;

		// Calculate the window size.
		ImFont* fpsFont = s_versionFont;
		ImVec2 size = fpsFont->CalcTextSizeA(fpsFont->FontSize, 1024.0f, 0.0f, "FPS: 99999");
		f32 width  = size.x + 8.0f;
		f32 height = size.y + 8.0f;

		// Get the raw delta time.
		const f64 dt = TFE_System::getDeltaTimeRaw();
		// Adjust the exponential average based on the frame time - this is because the standard of deviation is much higher as frame times get really small.
		const f64 expAve = dt >= 1.0 / 144.0 ? 0.95 : 0.999;
		// Compute the current fps from the delta time.
		const f64 curFps = 1.0f / dt;
		// Compute the exponential average based on the curFPS and the running average.
		const f64 aveFps = _fpsAve != 0.0 ? curFps * (1.0 - expAve) + _fpsAve * expAve : curFps;
		_fpsAve = aveFps;

		ImGui::PushFont(fpsFont);
		ImGui::SetNextWindowSize(ImVec2(width, height));
		ImGui::SetNextWindowPos(ImVec2(windowWidth - width, 0.0f));
		ImGui::Begin("##FPS", nullptr, windowFlags);
		ImGui::Text("FPS: %d", s32(aveFps + 0.5));
		ImGui::End();
		ImGui::PopFont();
	}
		
	void setCurrentGame(IGame* game)
	{