added imgui and config file to project

CMakeLists.txt

@@ -21,17 +21,40 @@ FetchContent_Declare(
   GIT_REPOSITORY https://github.com/Dav1dde/glad.git
   GIT_TAG v0.1.36
 )
-FetchContent_MakeAvailable(glfw glad)
+FetchContent_Declare(
+  imgui
+  GIT_REPOSITORY https://github.com/ocornut/imgui.git
+  GIT_TAG v1.91.9
+)
+
+FetchContent_MakeAvailable(glfw glad imgui)
+
+
+set(IMGUI_SOURCES
+  ${imgui_SOURCE_DIR}/imgui.cpp
+  ${imgui_SOURCE_DIR}/imgui_demo.cpp
+  ${imgui_SOURCE_DIR}/imgui_draw.cpp
+  ${imgui_SOURCE_DIR}/imgui_tables.cpp
+  ${imgui_SOURCE_DIR}/imgui_widgets.cpp
+)
+set(IMGUI_BACKEND_SOURCES
+  ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.cpp
+  ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp
+)
 
 set(SOURCES
     src/galaxy.cpp
     src/gwindow.cpp
     src/grenderer.cpp
+    src/gmenu.cpp
+    src/gconfig.cpp
     src/logger.cpp
     src/gshader.cpp
     src/vertex.cpp
     src/todo.cpp
     ${GLAD_OUT_DIR}/src/glad.c
+    ${IMGUI_SOURCES}
+    ${IMGUI_BACKEND_SOURCES}
 )
 
 set(GLAD_PROFILE "core" CACHE STRING "glad profile (core or compatibility)")
@@ -41,6 +64,7 @@ configure_file(include/env-vars.h.in ${CMAKE_BINARY_DIR}/generated/include/env-v
 set(INCLUDE_DIRS
     ${CMAKE_BINARY_DIR}/generated/include # env-vars.h
     ${GLAD_INCLUDE_DIRS} # glad/glad.h
+    ${imgui_SOURCE_DIR}
 )
 
 add_library(galaxy-engine-lib ${SOURCES})

imgui.ini

@@ -0,0 +1,28 @@
+[Window][Debug##Default]
+Pos=60,60
+Size=400,400
+
+[Window][Dear ImGui Demo]
+Pos=650,20
+Size=550,680
+
+[Window][Example: Console]
+Pos=59,60
+Size=520,600
+
+[Window][Example: Custom rendering]
+Pos=60,60
+Size=623,414
+
+[Window][Dear ImGui Demo/ResizableChild_478B81A3]
+IsChild=1
+Size=499,136
+
+[Window][Dear ImGui Demo/Red_BEEF922B]
+IsChild=1
+Size=200,100
+
+[Window][Default menu]
+Pos=60,60
+Size=367,117
+

include/galaxy.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "gshader.h"
+#include "gconfig.h"
 #include "grenderer.h"
 #include "gwindow.h"
 #include "logger.h"
@@ -9,8 +9,8 @@ class Galaxy {
 public:
   Galaxy();
   ~Galaxy();
-  Galaxy(GWindow *w, GRenderer *r, Logger *l)
-      : window(w), renderer(r), logger(l) {};
+  Galaxy(GWindow *w, GRenderer *r, Logger *l, GConfig *c)
+      : window(w), renderer(r), logger(l), config(c) {};
   void init();
   void run();
 
@@ -18,6 +18,7 @@ private:
   Logger *logger;
   GWindow *window;
   GRenderer *renderer;
+  GConfig *config;
 };
 
 static void glfw_errorCallback(int error, const char *description);

include/gconfig.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "logger.h"
+
+class GConfig {
+public:
+  GConfig(Logger *l);
+  ~GConfig();
+
+  void update_render_wireframe();
+
+  bool render_wireframe;
+  bool show_demo_menu;
+  bool show_menus;
+
+private:
+  Logger *logger;
+};

include/gmenu.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "gconfig.h"
+#include "gwindow.h"
+#include "logger.h"
+
+class GMenu {
+public:
+  GMenu(Logger *l, GWindow *w, GConfig *c) : logger(l), window(w), config(c) {};
+  ~GMenu() {};
+
+  void init();
+  void update();
+  void default_menu();
+
+private:
+  Logger *logger;
+  GWindow *window;
+  GConfig *config;
+};

include/grenderer.h

@@ -1,20 +1,27 @@
 #pragma once
 
-#include "gwindow.h"
+#include "gconfig.h"
+#include "gmenu.h"
 #include "gshader.h"
+#include "gwindow.h"
 #include "logger.h"
 
 class GRenderer {
 public:
-  GRenderer(GWindow *w, Logger *l);
+  GRenderer(GWindow *w, Logger *l, GConfig *c);
   ~GRenderer();
   void init();
   void update();
 
+  void init_imgui();
+  void update_imgui();
+
 private:
   Logger *logger;
+  GConfig *config;
   GWindow *window;
   GShader *shader;
+  GMenu *menu;
 
   unsigned int VAO;
   unsigned int VBO;

include/gshader.h

@@ -1,10 +1,11 @@
 #pragma once
 
 #include "logger.h"
+#include "gconfig.h"
 
 class GShader {
 public:
-  GShader(Logger *l) : logger(l), vertex_shader(0), fragment_shader(0) {};
+  GShader(Logger *l, GConfig *c) : logger(l), config(c), vertex_shader(0), fragment_shader(0) {};
   ~GShader();
 
   void init();
@@ -15,6 +16,7 @@ public:
 
 private:
   Logger *logger;
+  GConfig *config;
   unsigned int vertex_shader;
   unsigned int fragment_shader;
   unsigned int program;

src/galaxy.cpp

@@ -1,5 +1,6 @@
 #include "logger.h"
 #include "galaxy.h"
+#include "gconfig.h"
 
 const int W_WIDTH = 800;
 const int W_HEIGHT = 600;
@@ -9,8 +10,9 @@ Galaxy::Galaxy() {
   this->logger = logger;
   LOG_INFO("Starting the engine...");
 
+  GConfig *config = new GConfig(logger);
   GWindow *window = new GWindow(W_WIDTH, W_HEIGHT, logger);
-  GRenderer *renderer = new GRenderer(window, logger);
+  GRenderer *renderer = new GRenderer(window, logger, config);
 
   this->window = window;
   this->renderer = renderer;
@@ -23,6 +25,7 @@ Galaxy::~Galaxy() {
 
   delete this->renderer;
   delete this->window;
+  delete this->config;
   delete this->logger;
 }
 

src/gconfig.cpp

@@ -0,0 +1,16 @@
+#include "glad/glad.h"
+
+#include "gconfig.h"
+#include "logger.h"
+
+GConfig::GConfig(Logger *l)
+    : logger(l), render_wireframe(0), show_menus(1), show_demo_menu(0) {}
+GConfig::~GConfig() {};
+
+void GConfig::update_render_wireframe() {
+  // Test variable to enable wireframe rendering
+  if (this->render_wireframe)
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+  else
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+}

src/gmenu.cpp

@@ -0,0 +1,50 @@
+#include "backends/imgui_impl_glfw.h"
+#include "backends/imgui_impl_opengl3.h"
+#include "imgui.h"
+
+#include "gmenu.h"
+
+void GMenu::init() {
+  // Setup Dear ImGui context
+  IMGUI_CHECKVERSION();
+  ImGui::CreateContext();
+  ImGuiIO &io = ImGui::GetIO();
+  io.ConfigFlags |=
+      ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
+  io.ConfigFlags |=
+      ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
+
+  // Setup Platform/Renderer backends
+  ImGui_ImplGlfw_InitForOpenGL(
+      this->window->getWindow(),
+      true); // Second param install_callback=true will install GLFW callbacks
+             // and chain to existing ones.
+  ImGui_ImplOpenGL3_Init();
+}
+
+void GMenu::default_menu() {
+  ImGui::Begin("Default menu");
+  ImGui::Text("Inside this menu you can edit the config variables");
+
+  ImGui::Checkbox("Render only wireframes", &this->config->render_wireframe);
+  ImGui::Checkbox("Show demo menu", &this->config->show_demo_menu);
+  ImGui::Checkbox("Show menus in general", &this->config->show_menus);
+
+  ImGui::End();
+}
+
+void GMenu::update() {
+  ImGui_ImplOpenGL3_NewFrame();
+  ImGui_ImplGlfw_NewFrame();
+  ImGui::NewFrame();
+  if (this->config->show_demo_menu)
+    ImGui::ShowDemoWindow(); // Show demo window! :)
+
+  if (this->config->show_menus)
+    this->default_menu();
+
+  this->config->update_render_wireframe();
+
+  ImGui::Render();
+  ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+}

src/grenderer.cpp

@@ -1,6 +1,8 @@
 #include "glad/glad.h"
 
 #include "env-vars.h"
+#include "gconfig.h"
+#include "gmenu.h"
 #include "grenderer.h"
 #include "gshader.h"
 #include "logger.h"
@@ -17,13 +19,16 @@ unsigned int indices[] = {
     1, 2, 3  // second triangle
 };
 
-GRenderer::GRenderer(GWindow *w, Logger *l) : window(w), logger(l), VAO(0), VBO(0) {
-  this->shader = new GShader(l);
+GRenderer::GRenderer(GWindow *w, Logger *l, GConfig *c)
+    : window(w), logger(l), config(c), VAO(0), VBO(0) {
+  this->shader = new GShader(l, c);
+  this->menu = new GMenu(l, w, c);
 }
 
 GRenderer::~GRenderer() {
   LOG_DEBUG("Shutting down renderer...");
   delete this->shader;
+  delete this->menu;
 }
 
 void GRenderer::init() {
@@ -47,9 +52,13 @@ void GRenderer::init() {
 
   glBindBuffer(GL_ARRAY_BUFFER, 0);
   glBindVertexArray(0);
+
+  if (this->config->show_menus)
+    this->menu->init();
 }
 
 void GRenderer::update() {
+
   glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
   glClear(GL_COLOR_BUFFER_BIT);
 
@@ -57,5 +66,8 @@ void GRenderer::update() {
   glBindVertexArray(this->VAO);
   glDrawArrays(GL_TRIANGLES, 0, 3);
 
+  if (this->config->show_menus)
+    this->menu->update();
+
   glfwSwapBuffers(this->window->getWindow());
 }

src/gshader.cpp

@@ -36,11 +36,6 @@ void GShader::init() {
 
   this->program = program;
   glUseProgram(this->program);
-
-  // Test variable to enable wireframe rendering
-  if (WIREFRAME_RENDERING) {
-    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-  }
 };
 
 GShader::~GShader() {