[gzdoom-ee3712ff] new stereo modes break linux build

[VoidMage]

The trivial part is that in src/gl/stereo3d/gl_quadstereo.h,

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static const QuadStereo& QuadStereo::getInstance(float ipd);

should (probably) be

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static const QuadStereo& getInstance(float ipd);

The non-trivial part is that 'vr_enable_quadbuffered' isn't implemented in SDL backend, which wouldn't be all that bad, if not for that var not being defined at all, resulting in 'undefined reference' linking error.

SDL_GL_STEREO seems to be the needed attribute.

[Graf Zahl]

fixed the compile. But to enable this feature someone with Linux access needs to do it.

[biospud]

fixed the compile. But to enable this feature someone with Linux access needs to do it.

Thanks Graf for cleaning up my mess yet again. These fixes will also help my GZ3Doom fork.

Does anyone here actually have stereoscopic 3D hardware working on Linux? If so, I'd like to know the details of your graphics board, glasses model, and linux distribution/version, so I could possibly create a test system of my own.