OpenGL Shading Language


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GLSL is a C-style language.


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The language has undergone a number of version changes, and it shares the deprecation model of OpenGL. The current version of GLSL is 4. GLSL is quite unique among shading languages due to its compilation model.

OpenGL Shading Language

It's compilation model is more like the standard C paradigm. Compilation is overseen by a number of object types. Note that these do not follow the standard OpenGL Objects paradigm. According to GLSL's standard terminology, a shader is just a compiled set of strings for a particular programmable stage; it does not even need to have the complete code for that stage.

OpenGL Shading Language (GLSL) - Packages - Package Control

A program is a fully linked program that covers multiple programmable stages. For the sake of clarity, we will adjust this slightly. When the term shader is used, it will be synonymous with the GLSL concept of program. To refer to a GLSL shader, the term shader object will be used. It supports most of the familiar structural components for-loops, if-statements, etc.

But it has some important language differences. Originally, this functionality was achieved by writing shaders in ARB assembly language — a complex and unintuitive task. Originally introduced as an extension to OpenGL 1.


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It is only with OpenGL versions 3. Bitwise operators were added in version 1. User-defined functions are supported and built-in functions are provided.


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The graphics card manufacturer may optimize built-in functions at the hardware level. Many of these functions are similar to those in the math library of the C programming language while others are specific to graphics programming. GLSL shaders themselves are simply a set of strings that are passed to the hardware vendor's driver for compilation from within an application using the OpenGL API's entry points.

Programmable Graphics Hardware Pipeline

I could write a specification of the whole language here but I believe the better approach is to learn by example. In the next section a simple shader source code is introduced. Every section has a simple source code to download.

The Mesa 3D Graphics Library

A good way to learn GLSL is to download those example and modify it, do your own "experiments"! You should also download the official GLSL language specification. You can get it here under "Miscellaneous Documents".

OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language OpenGL Shading Language
OpenGL Shading Language

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