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How to find the version of OpenGL supported on my computer?

On Windows computers

1. Download the tool glewinfo.exe, this tool is found in The OpenGL Extension Wrangler Library
2. Launch the program
3. glewinfo will generate a report glewinfo.txt with the version of OpenGL supported :
   
   ---------------------------
   GLEW Extension Info
   ---------------------------
   
   GLEW version 2.1.0
   Reporting capabilities of pixelformat 7
   Running on a Radeon RX 580 Series from ATI Technologies Inc.
   
   OpenGL version 4.6.13547 Compatibility Profile Context 25.20.15031.1000 is supported

The report contain a lot of information about the OpenGL functions supported.
For example here is the full report of my computer: glewinfo.txt

On Mac computers

You can find the version of OpenGL supported with the model of your computer here: Mac computers that use OpenCL and OpenGL graphics.

On linux computers

1. You will need to install the package mesa-utils who contains GL utilities built by Mesa.
   
   In a terminal type :

   sudo apt-get install mesa-utils

2. Then call glxinfo with grep :

   glxinfo | grep "OpenGL version"