To implement a "main-menu-background-with-shaders" system, the engine typically renders a behind all other UI elements.

1. Introduction

: Executes for every pixel on the screen. It uses uniform variables (like u_time or u_mouse ) to calculate color values dynamically. 3. Key Shader Techniques

: Handles the positioning of the four corners of the quad. It ensures the shader covers the entire viewport regardless of aspect ratio.