On Wed, Feb 10, 2021 at 1:26 PM Otavio Salvador < [email protected]> wrote:
> > I didn't understand what you mean here. Could you elaborate this? > > If you try to build mesa with PACKAGECONFIG "egl gles dri" you get an error: ../mesa-20.3.2/meson.build:144:4: ERROR: Problem encountered: building OpenGL ES without OpenGL is not supported. This means that in practice you can't get a GLES-only build of mesa, so mesa always provides OpenGL (ignoring Vulkan). But for an abstract graphics driver that's not true - many drivers provide GLES but not OpenGL. I'd argue that this is an implementation detail (and maybe a minor bug) of mesa. If mesa internally requires code from its OpenGL support to build GLES, it should silently include that if it's been configured for GLES-only. I only mention it to be clear that in general "GLES requires OpenGL" is not true, even though mesa's build system enforces that.
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