Readme for wglinfo.c
--------------------

wglinfo is a small utility that displays all available Pixelformats
in an OpenGL system, along with Renderer Version information.

For usage information, type
wglinfo -h

Readme for modified wglinfo.c
-----------------------------

September 24, 1999

Author: Michael Wimmer (wimmer#cg.tuwien.ac.at)
WWW:	http://www.cg.tuwien.ac.at/~wimmer

This is a slightly modified wglinfo which is enhanced so as to 
show which Visuals (Pixelformats) are hardware accelerated. 
Two additional switches make it still easier to use.

For all questions not concerning the enhancements made, please refer to the
included source code. The original source code is to be found in the 
SGI OpenGL for Windows installation directory (normally c:\oglsdk)
under 'examples\misc'.

1) Hardware accelerated Visuals

In the 10th column, you will find two additional columns:

ge ge
ne ac

Those capture the PFD_GENERIC_FORMAT (gene) and PFD_GENERIC_ACCELERATED (geac)
flags of the Pixelformat descriptor.

If 'gene' is set to no, there is most probably an ICD (Installable Client
Driver) at work, i.e., a full OpenGL implementation by a hardware vendor.

If 'gene' is set to yes and 'geac' to no, then the MS/SGI (whichever is reported)
software implementation is at work.

If 'gene' and 'geac' both are set to yes, then the generic implementation is
supplemented by hardware acceleration, which should most certainly mean that
an MCD (Mini Client Driver) is at work, i.e., a small driver that only exposes
the rasterization interface of the underlying hardware.

2) Additional switches

The '-w' switch will cause only the windowed Pixelformats to be listed, i.e.,
all Pixelformats which can actually be used for rendering (so all Pixelformats
that can only render to bitmaps are omitted, making the output slightly more
readable).

The '-d' switch works around problems with some implementations where it is
not possible to create an OpenGL context without special preparations (fullscreen
mode or others). It forces wglinfo to only print Pixelformat information, but
no renderer information (which would require a context to be created).
This switch shouldn't be necessary for any current OpenGL driver.

The '-b' switch works around a bug in the 3DFX Alpha driver that would cause the
program to crash (the 3DFX alpha driver does not respond correctly to the 
'DescribePixelFormat'-call when the parameter is 0, which should normally return
the number of available PixelFormats).
This switch shouldn't be necessary for any current OpenGL driver.