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FP GLSL
File conversion

Convert FP to GLSL

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Is it possible to convert FP to GLSL?
Yes - FP converts to GLSL.

ARB fragment programs can be manually ported to GLSL (.glsl / .frag): replace assembly opcodes with GLSL built-in functions (dot(), texture(), etc.), rewrite register declarations as vec4 variables, replace result.color with gl_FragColor or out vec4. No automated tool reliably converts ARB assembly to GLSL; manual rewrite required.

Also to GLSL: PSSL · FX

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert FP to GLSL

Converting a .FP file to .GLSL lets you open the content in software that prefers the .GLSL format, though some details may change compared with the original. We are still putting together the list of programs that handle .FP files.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.FP OpenGL Fragment Program (ARB_fragment_program assembly shader)

An FP file associated with Celestia is a plain-text GPU shader written in ARB assembly language, controlling how individual pixels are rendered in 3D scenes. Open it with Celestia (place it…

Open .FP details →
.GLSL OpenGL Shading Language source code

A .GLSL file is associated with OpenGL Shading Language source code, a misc file.

Open .GLSL details →