It is already posted here since May 26, last updated May 29: pal1000/mesa-dist-win/blob/master/readme. That’s why we need that variable set to override Mesa default behavior with what’s the default on Windows. If you have a newer computer, you probably already have the hardware (video card) that you need. You need a video card for Open GL to Run. Contexts have to be requested explicitly by programs and Mesa demands the same thing and as explained above is not something to see often on Windows. All video card manufacturers make their own OpenGL drivers. These have to request core contexts for cross-platform compatibility to work, because on Unix things are completely different. Most exceptions are cross-platform applications that support at least Windows and a form of Unix (Linux, Mac, etc). These are unlikely to be used by Windows applications because all Windows graphics drivers that support OpenGL 3.1 and up implement GL_ARB_compatibility leading to default on compatibility contexts. The documentation only mentions core and core+forward compatible contexts. If the GPU doesnt support it, then you will need an upgrade. Putting something like this in a batch file that also launches your game/program you want to use Mesa with should do the trick: Download Opengl 3.3 Download 64 Bit - best software for Windows. Minimum specifications: OS: 64-bit editions of Windows 10 or 11. The documentation is unfortunately incomplete as it doesn’t state you can request a compatibility context with CONTEXTCOMPAT. Video card: Must support OpenGL 3.3 or higher and Vulkan 1.1 or higher. The one of interest is MESA_GL_VERSION_OVERRIDE. Do you have a way that your build can support OpenGL 3.3 fully (shading language 3.3) ?
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