OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition

Initializing and Creating a Window

To use GLUT, you first need to initialize the GLUT library by calling glutInit(). The function also parses any relevant command-line options you pass for specifying GLUT options.

void glutInit(int argc, char **argv);

glutInit() should be called before any other GLUT routine because it initializes the GLUT library. glutInit() will also process command-line options, but the specific options are window system dependent. For many windowing systems, command-line options like -iconic, -geometry, and -display are examples of options you might set that are processed by glutInit().

Following that, you’ll usually call glutInitDisplayMode() to configure the characteristics of the window, like having a depth or stencil ...