Allow to disable use of NSGLView
On recent Mac systems (Catalina) OpenGL is slower compared to directly using GTK's NSView. Furthermore when compiled on Catalina, and running on a system with a Retina screen, the initial size of the canvas may be wrong: libs/gtkmm2ext/nsglview.mm:175:1: warning: method possibly missing a [super reshape] call [-Wobjc-missing-super-calls] This is not an issue when running versions compiled on older systems.
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@ -278,6 +278,9 @@ __attribute__ ((visibility ("hidden")))
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void*
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Gtkmm2ext::nsglview_create (Gtkmm2ext::CairoCanvas* canvas)
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{
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if (g_getenv ("ARDOUR_NSGL") && (0 == atoi (g_getenv ("ARDOUR_NSGL")))) {
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return 0;
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}
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/* the API is currently only used on intel mac
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* for big-endian RGBA <> RGBA byte order of the texture
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* will have to be swapped.
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