OpenGL version related cleanups and hard-dependency drop. #380
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…OpenGL at compile time.
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Minor OpenGL version related cleanups, and remove hard dependency on OenGL at compile time.
Related to #166.
This is an attempt to make it possible to use the OpenGL software rasterizer. However, setting
Qt::AA_UseSoftwareOpenGL(even before Q(Gui)Application was created) did not automatically enable the use of the OpenGL software rasterizer on Linux (Gentoo).I still had to force it via environment variable
LIBGL_ALWAYS_SOFTWARE=1