Description: The ‘Display Callback’ in OpenGL is a function that is invoked to render the graphical scene within an OpenGL context. This function is fundamental in the lifecycle of a graphical application, as it is responsible for drawing all visual elements on the screen. When an OpenGL context is set up, a callback can be established that will execute whenever the display needs to be updated, such as when the window is resized or a new frame is requested. This mechanism allows developers to define how the scene should be represented, including the setup of lights, textures, and geometry. Additionally, using display callbacks facilitates the separation of application logic from graphical representation, promoting a cleaner and more modular design. In terms of performance, the use of callbacks allows for optimizing the rendering process, as calculations and updates can be performed only when necessary, rather than continuously. In summary, the ‘Display Callback’ is an essential tool in OpenGL that enables developers to efficiently manage the graphical representation of their applications.
