Thinking about doing a simple scheduling system next. Perhaps tick tied to the step_size?

include/Application.h

@@ -34,8 +34,9 @@
 // Srsly people who macro error codes are the devil
 #undef ERROR
 #include "Logger.h"
+#include "FrameWatcher.h"
 
-class Application {
+class Application: private Gui {
 
 public:	
 	const int WINDOW_X = 1536;
@@ -71,6 +72,8 @@ private:
 	Input input_handler;
 	std::shared_ptr<WindowHandler> window_handler;
 
+	FrameWatcher frame_watcher;
+
 	// The sfml imgui wrapper I'm using requires Update be called with sf::Time
 	// Might modify it to also accept seconds
 	sf::Clock sf_delta_clock;
@@ -90,4 +93,9 @@ private:
 		delta_time = 0.0,
 		accumulator_time = 0.0,
 		current_time = 0.0;
-};
+public:
+
+	virtual void render_gui() override;
+	virtual void update_gui() override;
+
+};

include/FrameWatcher.h

@@ -0,0 +1,26 @@
+
+
+class FrameWatcher {
+	
+
+
+	
+public:
+	FrameWatcher();
+	~FrameWatcher();
+
+	void do_tick();
+
+private:
+
+	float get_elapsed_time();
+
+	float step_size = 0.0166f;
+	double frame_time = 0.0;
+	double elapsed_time = 0.0;
+	double delta_time = 0.0;
+	double accumulator_time = 0.0;
+	double current_time = 0.0;
+
+
+};

include/Gui.h

@@ -42,7 +42,7 @@ private:
 	static std::list<Gui*> renderable_container;
 
 protected:
-	bool rendering = false;
+	bool rendering = true;
 	// Derived class will handle imgui calls
 	
 };

src/Application.cpp

@@ -110,17 +110,43 @@ bool Application::game_loop() {
 
 		// Time keeping
 		elapsed_time = elap_time();
+
+		// time between this and the last frame
 		delta_time = elapsed_time - current_time;
+
+		// Setup the time for the next tick
 		current_time = elapsed_time;
+		
+		// If the delta exceeded 0.2f, then limit the max lag we'll allow
+		// 1 / float is how you get the fps. 0.2f == 5fps
 		if (delta_time > 0.2f)
 			delta_time = 0.2f;
+
+		// Add the the physics accumulator our delta
 		accumulator_time += delta_time;
+
+		// We want to keep our physics at a constant step size but we have a variable frame rate.
+		// 0.016 == physics preferred timestep
+		// 0.030 == average 30 fps frame rate
+		// we must run the physics step ~twice every render frame to keep consistency
+		
+		int count = 0;
 		while ((accumulator_time - step_size) >= step_size) {
+			
+			
+			count++;
 			accumulator_time -= step_size;
 
+			// do physics at step size rate
+			
+			for (int i = 0; i < 1000; i++) {
+				int x = 9;
+				int r = i + x * 4;
+				current_time = elapsed_time;
+			}
 			// ==== DELTA TIME LOCKED ====
 		}
-
+		std::cout << count << "\n";
 		// ==== FPS LOCKED ====
 
 		window->clear(sf::Color::Black);
@@ -146,94 +172,6 @@ bool Application::game_loop() {
 		fps.draw();
 
 		Gui::do_render();
-
-		ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar;
-		bool window_show = true;
-		
-
-		if (ImGui::BeginMenuBar())
-		{
-			if (ImGui::BeginMenu("Menu"))
-			{
-				ImGui::Button("asdoifjasodif");
-				ImGui::EndMenu();
-			}
-			ImGui::EndMenuBar();
-		}
-
-		ImGui::Begin("Window");
-		ImGui::InputText("filename", screenshot_buf, 128);
-		if (ImGui::Button("Take Screen shot")) {
-
-			std::string path = "../assets/";
-			std::string filename(screenshot_buf);
-			filename += ".png";
-
-			sf::Texture window_texture;
-			window_texture.create(window->getSize().x, window->getSize().y);
-			window_texture.update(*window);
-
-			sf::Image image = window_texture.copyToImage();
-			image.saveToFile(path + filename);
-
-		}
-
-		ImGui::NextColumn();
-
-		if (ImGui::Button("Pause")) {
-
-			paused = !paused;
-
-			if (paused)
-				Logger::log("Pausing", Logger::LogLevel::INFO);
-			else
-				Logger::log("Unpausing", Logger::LogLevel::INFO);
-
-		}
-		ImGui::End();
-
-
-		ImGui::Begin("Controller debugger");
-
-		ImDrawList* draw_list = ImGui::GetWindowDrawList();
-		static ImVec4 col = ImVec4(1.0f, 0.0f, 1.0f, 1.0f);
-		const ImVec2 p = ImGui::GetCursorScreenPos();
-		const ImU32 col32 = ImColor(col);
-
-		std::vector<float> axis_values = {
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::X) / 2,
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::Y) / 2,
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::U) / 2,
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::R) / 2,
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::Z) / 2,
-			 sf::Joystick::getAxisPosition(0, sf::Joystick::Axis::V) / 2
-		};
-		
-		ImGui::Columns(3, "Axis's"); // 4-ways, with border
-		ImGui::Separator();
-		ImGui::Text("X Y"); ImGui::NextColumn();
-		ImGui::Text("U R"); ImGui::NextColumn();
-		ImGui::Text("Z V"); ImGui::NextColumn();
-		ImGui::Separator();
-
-		for (int i = 0; i < 3; i++) {
-			
-
-			float offset = ImGui::GetColumnWidth(i);
-			
-			draw_list->AddLine(ImVec2(p.x + 0 + offset * i, p.y + 50), ImVec2(p.x + 100 + offset * i, p.y + 50), col32, 1.0);
-			draw_list->AddLine(ImVec2(p.x + 50 + offset * i, p.y + 0), ImVec2(p.x + 50 + offset * i, p.y + 100), col32, 1.0);
-			draw_list->AddCircleFilled(ImVec2(p.x + axis_values[2 * i] + 50 + offset * i, p.y + axis_values[2 * i + 1] + 50), 6, col32, 32);
-			
-			ImGui::Dummy(ImVec2(100, 100));
-			ImGui::NextColumn();
-		}
-
-		
-		ImGui::End();
-
-		//ImGui::ShowTestWindow();
-
 		ImGui::Render();
 
 		// ImGUI messes up somthing in the SFML GL state, so we need a single draw call to right things
@@ -257,3 +195,40 @@ float Application::elap_time() {
 	return static_cast<float>(elapsed_time.count());
 }
 
+void Application::render_gui() {
+
+	ImGui::Begin("Window");
+	ImGui::InputText("filename", screenshot_buf, 128);
+	if (ImGui::Button("Take Screen shot")) {
+
+		std::string path = "../assets/";
+		std::string filename(screenshot_buf);
+		filename += ".png";
+
+		sf::Texture window_texture;
+		window_texture.create(window->getSize().x, window->getSize().y);
+		window_texture.update(*window);
+
+		sf::Image image = window_texture.copyToImage();
+		image.saveToFile(path + filename);
+
+	}
+
+	ImGui::NextColumn();
+
+	if (ImGui::Button("Pause")) {
+
+		paused = !paused;
+
+		if (paused)
+			Logger::log("Pausing", Logger::LogLevel::INFO);
+		else
+			Logger::log("Unpausing", Logger::LogLevel::INFO);
+
+	}
+	ImGui::End();
+}
+
+void Application::update_gui() {
+}
+

src/FrameWatcher.cpp

@@ -0,0 +1,48 @@
+
+#include "FrameWatcher.h"
+#include <chrono>
+
+FrameWatcher::FrameWatcher() {
+
+}
+
+FrameWatcher::~FrameWatcher()
+{
+
+}
+
+void FrameWatcher::do_tick() {
+
+
+	elapsed_time = get_elapsed_time();
+	delta_time = elapsed_time - current_time;
+	current_time = elapsed_time;
+
+	if (delta_time > 0.2f)
+		delta_time = 0.2f;
+
+	accumulator_time += delta_time;
+
+	while ((accumulator_time - step_size) >= step_size) {
+		accumulator_time -= step_size;
+
+		// ==== DELTA TIME LOCKED ====
+	}
+
+}
+
+float FrameWatcher::get_elapsed_time() {
+
+	static std::chrono::time_point<std::chrono::system_clock> start;
+	static bool started = false;
+
+	if (!started) {
+		start = std::chrono::system_clock::now();
+		started = true;
+	}
+
+	std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
+	std::chrono::duration<double> elapsed_time = now - start;
+	return static_cast<float>(elapsed_time.count());
+}
+