GLSL

GLSL is a programming language created in 1992.

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OpenGL Shading Language (abbreviated: GLSL), is a high-level shading language with a syntax based on the C programming language. It was created by the OpenGL ARB (OpenGL Architecture Review Board) to give developers more direct control of the graphics pipeline without having to use ARB assembly language or hardware-specific languages.. Read more on Wikipedia...

GLSL Wikipedia page
There are at least 11,778 GLSL repos on GitHub
GLSL first developed in OpenGL Architecture Review Board
file extensions for GLSL include glsl, fp, frag, frg, fs, fsh, fshader, geo, geom, glslf, glslv, gs, gshader, rchit, rmiss, shader, tesc, tese, vert, vrx, vsh and vshader
The Google BigQuery Public Dataset GitHub snapshot shows 12k users using GLSL in 14k repos on GitHub
Explore GLSL snippets on Rosetta Code
GLSL appears in the TIOBE Index
GLSL LSP implementation
Pygments supports syntax highlighting for GLSL
GitHub supports syntax highlighting for GLSL
See also: (8 related languages)OpenGL, C, Linux, JavaScript, Delphi, Java, WebGL, Cg

Example from Linguist:

varying vec4 v_color;

void main()
{
	gl_FragColor = v_color;
}

Feature	Supported	Token	Example
Comments	✓
MultiLine Comments	✓
Line Comments	✓
Integers	✓
Floats	✓
Hexadecimals	✓
Octals	✓

GLSL - Programming language

Language features