GLSL

GLSL is a high-level, C-style shading language designed to execute code directly on the GPU for real-time hardware acceleration.

GLSL (OpenGL Shading Language) provides developers with direct control over the graphics pipeline through specialized stages: vertex, fragment, and compute shaders. It utilizes a C-style syntax optimized for vector and matrix operations (such as vec4 and mat4) to calculate lighting, shadows, and 3D geometry transformations. Current standards like version 4.60 ensure cross-platform compatibility via the Khronos Group: maintaining high performance across diverse hardware. By offloading intensive mathematical computations to the GPU's parallel architecture, GLSL powers everything from AAA game engines to complex scientific visualizations.

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