Change CMakeLists.txt to add 2d_game project, and added irrKlang to LIBS.

Added irrKlang.dll and ikpMP2.dll to dlls folder.  Added irrKlang as a
sub-folder under includes.  Added irrKlang.lib to lib folder.  At this point
running cmake gave an error it couldn't find source files under 2d_game.
Moved 2d_game source up one folder level, then cmake found the files.

src/7.in_practice/3.2d_game/progress/2.program.cpp

@@ -0,0 +1,125 @@
+/*******************************************************************
+** This code is part of Breakout.
+**
+** Breakout is free software: you can redistribute it and/or modify
+** it under the terms of the CC BY 4.0 license as published by
+** Creative Commons, either version 4 of the License, or (at your
+** option) any later version.
+******************************************************************/
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include "game.h"
+#include "resource_manager.h"
+
+#include <iostream>
+
+// GLFW function declerations
+void framebuffer_size_callback(GLFWwindow* window, int width, int height);
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+
+// The Width of the screen
+const unsigned int SCREEN_WIDTH = 800;
+// The height of the screen
+const unsigned int SCREEN_HEIGHT = 600;
+
+Game Breakout(SCREEN_WIDTH, SCREEN_HEIGHT);
+
+int main(int argc, char *argv[])
+{
+    glfwInit();
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifdef __APPLE__
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+    glfwWindowHint(GLFW_RESIZABLE, false);
+
+    GLFWwindow* window = glfwCreateWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Breakout", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // glad: load all OpenGL function pointers
+    // ---------------------------------------
+    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+    {
+        std::cout << "Failed to initialize GLAD" << std::endl;
+        return -1;
+    }
+
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+    // OpenGL configuration
+    // --------------------
+    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    // initialize game
+    // ---------------
+    Breakout.Init();
+
+    // deltaTime variables
+    // -------------------
+    float deltaTime = 0.0f;
+    float lastFrame = 0.0f;
+
+    // start game within menu state
+    // ----------------------------
+    Breakout.State = GAME_MENU;
+
+    while (!glfwWindowShouldClose(window))
+    {
+        // calculate delta time
+        // --------------------
+        float currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+        glfwPollEvents();
+
+        // manage user input
+        // -----------------
+        Breakout.ProcessInput(deltaTime);
+
+        // update game state
+        // -----------------
+        Breakout.Update(deltaTime);
+
+        // render
+        // ------
+        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        Breakout.Render();
+
+        glfwSwapBuffers(window);
+    }
+
+    // delete all resources as loaded using the resource manager
+    // ---------------------------------------------------------
+    ResourceManager::Clear();
+
+    glfwTerminate();
+    return 0;
+}
+
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
+{
+    // when a user presses the escape key, we set the WindowShouldClose property to true, closing the application
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, true);
+    if (key >= 0 && key < 1024)
+    {
+        if (action == GLFW_PRESS)
+            Breakout.Keys[key] = true;
+        else if (action == GLFW_RELEASE)
+            Breakout.Keys[key] = false;
+    }
+}
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+    // make sure the viewport matches the new window dimensions; note that width and 
+    // height will be significantly larger than specified on retina displays.
+    glViewport(0, 0, width, height);
+}