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I need opengl 4.2 for my app to run on server(windows). So I found Mesa3D software implementation of opengl will solve my purpose. I built Mesa3D 19.0.0 for windows. But when use opengl32.dll and lib given by Mesa , default version is coming as 3.1 . I tried checking their documentation, I didn't understand how to get Opengl 4.2 .

Raki
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You'll have to pour a bunch of time/effort/money into the Mesa project.

Currently their software renderers (softpipe/llvmpipe/swr) only support up to OpenGL 3.3 Core.

Note that (currently) you'll have to request a Core context to get 3.3. Compatibility contexts are limited to 3.0.

As of Mesa 20.2 llvmpipe supports OpenGL 4.5.

genpfault
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  • genpfault, Got you.Out of curiosity I'm asking, why are they mentioning like 4.x support is added in their release notes.? – Raki Feb 13 '19 at 05:50
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    @Raki: Those generally have only been applying to their various hardware drivers (Intel, AMD, etc.): "Mesa implements the OpenGL 4.5 API, but the version... *depends on the particular driver being used*." The software renders hit 3.3 *years* ago and have just kinda...stayed there. – genpfault Feb 13 '19 at 16:23