From 3117b087c2af49859a38652bd40756ff7b5d0bb0 Mon Sep 17 00:00:00 2001
From: Ben Kyd <benjaminkyd@gmail.com>
Date: Tue, 25 Oct 2022 18:16:02 +0100
Subject: [PATCH] callback calls the callback that's called by the callback
 calling callback

---
 .vscode/settings.json |  3 ++-
 src/inferno.cpp       |  3 ++-
 src/singleton.hpp     | 21 +++++++++++++++++++
 src/window.cpp        | 49 +++++++++++++++++++++++++++++++++++--------
 src/window.hpp        | 17 +++++++++++----
 5 files changed, 78 insertions(+), 15 deletions(-)
 create mode 100644 src/singleton.hpp

diff --git a/.vscode/settings.json b/.vscode/settings.json
index a0f1242..7e83515 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -68,7 +68,8 @@
         "typeindex": "cpp",
         "typeinfo": "cpp",
         "valarray": "cpp",
-        "variant": "cpp"
+        "variant": "cpp",
+        "complex": "cpp"
     },
     "cmake.configureOnOpen": false
 }
\ No newline at end of file
diff --git a/src/inferno.cpp b/src/inferno.cpp
index 6b273be..78cbe9d 100644
--- a/src/inferno.cpp
+++ b/src/inferno.cpp
@@ -19,7 +19,8 @@ Inferno::Inferno(int argc, char** argv)
     spdlog::info("INFERNO HART v" INFERNO_VERSION);
 
     // Create window
-    mWin = new Window("Inferno v" INFERNO_VERSION, 1280, 720);
+    mWin = &Window::GetInstance();
+    mWin->init("Inferno v" INFERNO_VERSION, 1280, 720);
 }
 
 Inferno::~Inferno()
diff --git a/src/singleton.hpp b/src/singleton.hpp
new file mode 100644
index 0000000..4f63e80
--- /dev/null
+++ b/src/singleton.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+namespace inferno::helpers {
+
+template <class T>
+class Singleton
+{
+public:
+	static T& GetInstance()
+	{
+		static T instance;
+		return instance;
+	}
+
+	Singleton( Singleton const& ) = delete;
+	void operator=( Singleton const& ) = delete;
+protected:
+	Singleton() = default;
+};
+
+}
diff --git a/src/window.cpp b/src/window.cpp
index 53e0be8..efba1b3 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -4,7 +4,18 @@
 
 using namespace inferno;
 
-Window::Window(std::string title, int width, int height) 
+Window::Window() 
+{
+
+}
+
+Window::~Window() 
+{
+    shutdownImGui();
+    shutdownGLFW();    
+}
+
+void Window::init(std::string title, int width, int height)
 {
     this->width = width;
     this->height = height;
@@ -16,12 +27,6 @@ Window::Window(std::string title, int width, int height)
     setupImGui();
 }
 
-Window::~Window() 
-{
-    shutdownImGui();
-    shutdownGLFW();    
-}
-
 void Window::setTitle(std::string title) 
 {
     glfwSetWindowTitle(window, title.c_str());
@@ -50,6 +55,26 @@ void Window::getPos(int& x, int& y)
     glfwGetWindowPos(window, &x, &y);
 }
 
+void Window::setKeyCallback(KeyCallback callback)
+{
+    mKeyCallback = callback;
+}
+
+void Window::setMouseCallback(MouseCallback callback)
+{
+    mMouseCallback = callback;
+}
+
+KeyCallback Window::getKeyCallback()
+{
+    return mKeyCallback;
+}
+
+MouseCallback Window::getMouseCallback()
+{
+    return mMouseCallback;
+}
+
 bool Window::newFrame() 
 {
     glfwPollEvents();
@@ -153,12 +178,18 @@ void Window::shutdownGLFW()
 
 void Window::glfwKeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
 {
-
+    if (Window::GetInstance().getKeyCallback() != nullptr)
+    {
+        Window::GetInstance().getKeyCallback()(key, scancode, action, mods);
+    }
 }
 
 void Window::glfwMouseCallback(GLFWwindow* window, double xpos, double ypos)
 {
-
+    if (Window::GetInstance().getMouseCallback() != nullptr)
+    {
+        Window::GetInstance().getMouseCallback()(xpos, ypos);
+    }
 }
 
 void Window::glfwErrorCallback(int error, const char* description) {
diff --git a/src/window.hpp b/src/window.hpp
index 1b18760..e9f57f4 100644
--- a/src/window.hpp
+++ b/src/window.hpp
@@ -2,20 +2,24 @@
 
 #include <string>
 
+#include "singleton.hpp"
 #include "graphics.hpp"
 
 #define WINDOW_FLAGS ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoCollapse
 
 namespace inferno {
 
+typedef void (*KeyCallback)(int key, int scan, int action, int mod);
+typedef void (*MouseCallback)(double x, double y);
 
-
-class Window
+class Window : public helpers::Singleton<Window>
 {
 public:
-    Window(std::string title, int width, int height);
+    Window();
     ~Window();
 
+    void init(std::string title, int width, int height);
+
     bool newFrame();
     void render();
 
@@ -27,7 +31,10 @@ public:
     void getPos(int& x, int& y);
     GLFWwindow* getGLFWWindow() { return window; }
 
-
+    void setKeyCallback(KeyCallback callback);
+    void setMouseCallback(MouseCallback callback);
+    KeyCallback getKeyCallback();
+    MouseCallback getMouseCallback();
 
 private:
     void setupGLFW(std::string title);
@@ -37,6 +44,8 @@ private:
 
     static void glfwKeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods);
     static void glfwMouseCallback(GLFWwindow* window, double xpos, double ypos);
+    KeyCallback mKeyCallback = nullptr;
+    MouseCallback mMouseCallback = nullptr;
 
     static void glfwErrorCallback(int error, const char* description);