The createWindow function initializes SDL and OpenGL, creates a window with the title "C++ SDL2 Window | OpenGL" and size 1000x800, and enables double buffering and a core profile, before returning the window ID.
This function uses SDL functions such as SDL_Init, SDL_GL_SetAttribute, SDL_GL_CreateContext, SDL_CreateWindow, and SDL_GL_SwapWindow for event handling and window management.
The code defines an asynchronous doFrame function that initializes and calls OpenGL functions, and an asynchronous testOpenGL function that creates a window and sets an interval to repeatedly call doFrame with the window object. The testOpenGL function is exported as a module.
This C++ code defines a 3D transformation system using SDL for rendering, which consists of classes and functions for representing points, vectors, and matrices, as well as applying transformations such as rotation, translation, and connection drawing. The system uses the SDL library for rendering and includes functions for calculating dot products, applying composite transformations, and getting rotation matrices.