GraphicsMode.Index is set by the platform-specific context constructor,
which is invoked after the X11GLControl constructor. It does not make
sense to check GraphicsMode.Index in the X11GLControl constructor, as it
is never set at that point.
Without this flag, OpenGL rendering does not work as expected.
Additionally, all WGL_ARB_pixel_format attributes are expected to be
specified in key-value pairs. Fixed double-buffering and stereoscoping
rendering attributes.
Fixed WGL_ARB_pixel_format attribute selection for doublebuffering,
stereoscopic rendering and hardware acceleration. Implemented
minimization strategy to select the optimal PixelFormatDescriptor in the
fallback path.
Instead of creating a list of all available formats and iterating
through that, we let the driver decide which is the best accelerated
format to use for the user parameters. If no such format exists, we fall
back to generic acceleration or software acceleration, in turn.
This affects issue #21
Don't filter window messages passed to our window (see
http://blogs.msdn.com/b/oldnewthing/archive/2005/02/09/369804.aspx).
Additionally, return the correct values for all messages we are actually
handling and clean up unmanaged memory after we are done with the
window.
Instead of combining PeekMessage+GetMessage, we can simply call
PeekMessage(Remove) to achieve the same effect. This also allows us to
remove the IsIdle property, which is no longer used anywhere.
The temporary context is now retained until the actual context has been
constructed. If we don't do this, then WGL_ARB_create_context may fail
to work correctly on specific GPUs (e.g. Intel). This may affect issue
#19.
The correct way to query number of available pixel formats is to use
Wgl.Arb.GetPixelFormatAttrib(NumberPixelFormatsArb), not
Wgl.Arb.ChoosePixelFormats. This fixes an issue where Intel drivers
would fail to report any pixel formats in GetModesARB, even when
WGL_ARB_pixel_format is supported.
