Nove repo opengl-learning

lessons/1. Getting started/2. Hello window/src/main.cpp

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+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <iostream>
+
+using namespace std;
+
+// Global Constants
+const int WINDOW_WIDTH = 800;
+const int WINDOW_HEIGHT = 600;
+// Globals
+GLFWwindow* window;
+
+uint8_t init(void);
+void framebuffersize_callback(GLFWwindow* window, int width, int height);
+void freeAll(void);
+void proccessInput(GLFWwindow* window);
+
+int main(int argc, char** argv)
+{
+	if (init() != 0)
+		return -1;
+
+	// MAIN loop
+	while (!glfwWindowShouldClose(window)) {
+		// input ...
+		proccessInput(window);
+
+		// rendering commands here ...
+		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT);
+
+		// check and calls events and swap the buffers
+		glfwSwapBuffers(window);
+		glfwPollEvents();
+	}
+
+	freeAll();
+	return 0;
+}
+
+uint8_t init(void) {
+	// init of glfw window
+	glfwInit();
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Hello Window!", NULL, NULL);
+	if (window == NULL) {
+		cerr << "Failed to create glfw window" << endl;
+		glfwTerminate();
+		return 1;
+	}
+	glfwMakeContextCurrent(window);
+
+	// init of GLAD
+	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
+		cerr << "Failed to initialize GLAD" << endl;
+	}
+
+	glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
+	return 0;
+}
+void framebuffersize_callback(GLFWwindow* window, int width, int height)
+{
+	glViewport(0, 0, width, height);
+}
+void freeAll(void)
+{
+	glfwTerminate();
+}
+void proccessInput(GLFWwindow* window)
+{
+	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+		glfwSetWindowShouldClose(window, true);
+}