feat: add game visual and start gObserver

src/visual.cpp

@@ -0,0 +1,87 @@
+#include "visual.hpp"
+
+#include <GLFW/glfw3.h>
+#include <iostream>
+
+Visual::Visual(const char *name, int width, int height) : width(width), height(height)
+{
+	if(!glfwInit())
+    {
+        std::cerr << "Failed to initialize GLFW";
+        exit(1);
+    }
+
+	// opengl 3.3
+	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
+
+	this->window = glfwCreateWindow(this->width, this->height, name, nullptr, nullptr);
+	if (!this->window)
+	{
+        std::cerr << "Failed to create GLFW window\n";
+        glfwTerminate();
+        exit(1);
+    }
+
+	glfwMakeContextCurrent(window);
+
+	glewExperimental = GL_TRUE;
+	if (glewInit() != GLEW_OK)
+	{
+		std::cerr << "Failed to initialize GLEW\n";
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+	}
+	
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_MULTISAMPLE);
+}
+
+Visual::~Visual()
+{
+	if (window)
+		glfwDestroyWindow(window);
+
+	glfwTerminate();
+	std::cout << "Game finished with success." << std::endl;
+}
+
+void Visual::run()
+{
+	while(!glfwWindowShouldClose(this->window))
+	{
+		glfwGetWindowSize(window, &this->width, &this->height);
+		glViewport(0, 0, this->width, this->height);
+
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
+
+		glDisable(GL_MULTISAMPLE);
+		glfwPollEvents();
+		glfwSwapBuffers(window);
+
+		GLenum error;
+		if ((error = glGetError()) != GL_NO_ERROR)
+            std::cout << error << std::endl;
+	}
+}
+
+int Visual::getWidth()
+{
+	return this->width;
+}
+
+int Visual::getHeight()
+{
+	return this->height;
+}
+
+GLFWwindow* Visual::getWindow()
+{
+	return this->window;
+}