GLSL (OpenGL)

GLSL is a high-level shading language based on C that executes directly on the GPU for real-time graphics rendering.

GLSL (OpenGL Shading Language) provides developers with direct control over the graphics pipeline via vertex, fragment, and compute shaders. It uses a C-style syntax to handle vector and matrix operations natively, enabling hardware-accelerated effects like Phong lighting, PBR (Physically Based Rendering), and complex particle systems. By offloading parallel math to the GPU's execution units, GLSL achieves the high-frame-rate performance required for modern 3D engines and interactive visualizations.

https://www.khronos.org/opengl/wiki/Core_Language_(GLSL)