AFAIK even if you ask for 24 and there is no support for it, you'll get a 16bit buffer anyway.
On Wed, Jan 23, 2013 at 12:21 AM, Michalis Kamburelis < michalis.ka...@gmail.com> wrote: > Reimar Grabowski wrote: > >> Hi, >> >> the in the topic mentioned property defaults to a value of 16. Is >> there any special reason for it? IMHO the default value should be 24. >> After all it's 2013 and not 1998. >> >> It's not really a problem, I just want to know the reason why this >> value was chosen. >> >> > Before my patch on > http://bugs.freepascal.org/**view.php?id=22170<http://bugs.freepascal.org/view.php?id=22170>the > depth bits were hardcoded (16 on WinAPI and 1 on GLX). So I set the > default value for TOpenGLControl.DepthBits at safe 16. > > The general idea is that TOpenGLControl has safe default values, that are > guaranteed to work (and be fast) even on really really ancient graphic > cards or when the system is running under virtual machine (which often > means you don't get hardware-accelarated 3D until you explicitly > install/enable something). For the same reason e.g. > TOpenGLControl.StencilBits is by default 0, even though all modern GPUs can > give you at least 8-bit stencil buffer. > > Other APIs to get OpenGL context, like GtkGLExt or Glut or low-level > WinAPI or GLX follow the same convention. The defaults are very > conservative. > > That said, I would be personally fine with changing this default to 24, if > others think it's a good idea. A developer can always lower it to 16 when > that's enough. So, I don't really have a strong preference about it. > > Michalis > > > -- > ______________________________**_________________ > Lazarus mailing list > Lazarus@lists.lazarus.**freepascal.org<Lazarus@lists.lazarus.freepascal.org> > http://lists.lazarus.**freepascal.org/mailman/**listinfo/lazarus<http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus> >
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