GLUT & Double Buffering

Double Buffering Concept

In real-time rendering, drawing directly to the screen (Single Buffering) causes visible flickering because the rendering steps are shown as they happen. To solve this, **Double Buffering** uses two buffers:

• Front Buffer: Currently displayed on the screen.
• Back Buffer: Offscreen buffer where drawing commands are executed incrementally.

Once rendering is complete, the buffers are swapped instantaneously via glutSwapBuffers().

Timer & Idle Callbacks

To animate frames smoothly, GLUT provides loop mechanisms:

• glutTimerFunc(delay, callback, value): Triggers a rendering tick every N milliseconds, calling itself recursively to maintain a fixed update interval.
• glutIdleFunc(callback): Triggers updates continuously whenever the CPU is idle, yielding maximum possible frame rates.