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GLUT for Win32 README
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VERSION/INFO:

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This is GLUT for Win32 version 3.7.6 as of Nov 8th 2001.
See the COPYRIGHT section for distribution and copyright notices.
Send all bug reports and questions for this version of GLUT to

For more information about GLUT for Win32, see the web page:
www.pobox.com/~nate/glut.html or subscribe to the GLUT for Win32
mailing list by sending e-mail to with
“subscribe glut” in the body of the message.

For general information about GLUT, see the GLUT web page:
http://reality.sgi.com/opengl/glut3/glut3.html and be sure to
check the GLUT FAQ first for any questions that you may have:
http://reality.sgi.com/opengl/glut3/glut-faq.html

COMPILING/INSTALLATION:

o Precompiled versions of the DLL and import library can be
found on the GLUT for Win32 web page mentioned above.

o Microsoft Developer Studio 6 workspace and project files have
been included in the source code distribution.

To build the glut dll:
First, open Microsoft Developer Studio.
Then, select File -> Open Workspace and find the glut.dsw file
in the file dialog and double-click on it.
Finally, select Build -> Build glut32.dll.
When the build is finished, it will copy:
glut32.dll to %WinDir%System,
glut32.lib to $(MSDevDir)….VC98lib, and
glut.h to $(MSDevDir)….VC98includeGL.

Additional workspace files have been included in the progs, test
and lib directories to build the progs, tests and libs respectively.

BORLAND NOTES:

From what I understand, Borland supplies a utility that
converts Microsoft Visual C++ .libs into Borland compatible
files. Therefore, the best method for Borland users is
probably to get the precompiled versions of the library and
convert the library. To create an import library for Borland
from the DLLs, use the following command (from a command prompt):
IMPLIB glut32.lib glut32.dll
If IMPLIB crashes when called this way, try
IMPLIB glut32.lib glut32.def
using the glut32.def file in this distribution.

FORTRAN NOTES:

has put considerable
effort into getting GLUT to work with different compilers for
Fortran 90. He indicates that you should copy the f90glut.h
file to your $(MSDevDir)….VC98includeGL directory.
Then, just build GLUT as usual. The Fortran 90 interface, f90gl,
can be obtained at http://math.nist.gov/f90gl and contains
installation instructions and usage examples.

MISC NOTES:

o Overlay support is not implemented, nor are there any plans to
implement it in the near future.

o To customize the windows icon, you can use the resource name
GLUT_ICON. For example, create an icon named “glut.ico”, and
create a file called glut.rc that contains the following:
GLUT_ICON ICON glut.ico
then compile the glut.rc file with the following:
rc /r glut
and link the resulting glut.res file into your executable
(just like you would an object file).
Alternatively, you can simply add the glut.rc file to your
project if you are using Microsoft Developer Studio.

IMPLEMENTATION DEPENDENT DIFFERENCES:

There are a few differences between the Win32 version of GLUT
and the X11 version of GLUT. Those are outlined here. Note
that MOST of these differences are allowed by the GLUT
specification. Bugs and unsupported features are outlined in
the UNSUPPORTED/BUGS section.

o glutInit:
The following command line options have no meaning (and are
ignored) in GLUT for Win32:
-display, -indirect, -direct, -sync.

o glutInitWindowPosition, glutPositionWindow:
Win32 has two different coordinate systems for windows.
One is in terms of client space and the other is the whole
window space (including the decorations). If you
glutPositionWindow(0, 0), GLUT for Win32 will place the
window CLIENT area at 0, 0. This will cause the window
decorations (title bar and left edge) to be OFF-SCREEN, but
it gives the user the most flexibility in positioning.
HOWEVER, if the user specifies glutInitWindowPosition(0, 0),
the window is placed relative to window space at 0, 0.
This will cause the window to be opened in the upper left
corner with all the decorations showing. This behaviour is
acceptable under the current GLUT specification.

o glutSetIconTitle, glutSetWindowTitle:
There is no separation between Icon title and Window title
in Win32. Therefore, setting an icon title in Win32 has
no effect.

o glutSetCursor:
As indicated in the GLUT specification, cursors may be
different on different platforms. This is the case in GLUT
for Win32. For the most part, the cursors will match the
meaning, but not necessarily the shape. Notable exceptions
are the GLUT_CURSOR_INFO & GLUT_CURSOR_SPRAY which use the
crosshair cursor and the GLUT_CURSOR_CYCLE which uses the
‘no’ or ‘destroy’ cursor in Win32.

o glutVisibilityFunc:
Win32 seems to be unable to determine if a window is fully
obscured. Therefore, the visibility of a GLUT window is
only reflected by its Iconic, Hidden or Shown state. That
is, even if a window is fully obscured, in GLUT for Win32,
it is still “visible”.

o glutEntryFunc:
Window Focus is handled differently in Win32 and X.
Specifically, the “window manager” in Win32 uses a “click to
focus” policy. That is, in order for a window to receive
focus, a mouse button must be clicked in it. Likewise, in
order for a window to loose focus, a mouse button must be
clicked outside the window (or in another window).
Therefore, the Enter and Leave notification provided by GLUT
may behave differently in the Win32 and in X11 versions.
There is a viable workaround for this. A program called
“Tweak UI” is provided by Microsoft which can be used to
change the focus policy in Win32 to “focus follows mouse”.
It is available from the Microsoft Web Pages:
http://www.microsoft.com/windows/software/PowerToy.htm

o glutCopyColormap:
GLUT for Win32 always copies the colormap. There is never
any sharing of colormaps. This is probably okay, since
Win32 merges the logical palette and the physical palette
anyway, so even if there are two windows with totally
different colors in their colormaps, Win32 will find a
(hopefully) good match between them.

o glutIdleFunc + menus:
The glut idle function will NOT be called when a menu is
active. This causes all animation to stop when a menu is
active (in general, this is probably okay). Timer
functions will still fire, however. If the timer callback
draws into the rendering context, the drawing will not show
up until after the menu has finished, though.

UNSUPPORTED/BUGS:

o glutAttachMenu:
Win32 only likes to work with left and right mouse buttons.
Especially so with popup menus. Therefore, when attaching
the menu to the middle mouse button, the LEFT mouse button
must be used to select from the menu.

o glutSpaceball*, glutButtonBox*, glutTablet*, glutDials*:
None of the special input devices are supported at this

o When resizing or moving a GLUT for Win32 window, no updating
is performed. This causes the window to leave “tracks” on
the screen when getting bigger or when previously obscured
parts are being revealed. I put in a bit of a kludgy
workaround for those that absolutely can’t have the weird
lines. The reshape callback is called multiple times for
reshapes. Therefore, in the reshape callback, some drawing
can be done. It should probably be limited to a color buffer

o The video resizing capabilities of GLUT 3.3+ for X11 is
currently unimplemented (this is probably ok, since it
really isn’t part of the spec until 4.0). I doubt that
this will ever be part of GLUT for Win32, since there is no
hardware to support it. A hack could simply change the
resolution of the desktop.

CHANGES/FIXES:

(Nov 8, ’01)
x Released 3.7.6

(Nov 8, ’01)
x Changed fullscreen mode from TOPMOST back to simply TOP, since
(it turns out) many people use windows atop a GLUT window.

(Nov 8, ’01)
x Added code to prevent CPU spiking when no idle function is
registered. Otherwise, if an idle function is registered, spike
CPU so that the idle function gets all the attention it needs and
if this is a problem on the program side, the user can stick a
sleep() in their idle function. I believe that this strikes the
best balance betweeen GLUT being fast, and also being “nice” to
other processes. Thanks to for reporting this bug.

(Nov 8, ’01)
x Fixed bug in motion callback handler which wasn’t setting the
current window, so multiple window apps (e.g., any GLUI app)
wouldn’t get the callback correctly.

(Oct 4, ’01)
x Fixed bug in glutEnterGameMode() that caused new windows to not
be in “fullscreen” mode, so they got window decorations.

(Oct 4, ’01)
x Fixed bug in glutEnterGameMode() that caused new windows to not
be in “fullscreen” mode, so they got window decorations.

(Oct 3, ’01)
x Fixed bug in getVisualInfoFromString(): visuals not reloaded on
display mode change. Reload visuals each time they are queried.
This fixes a problem with Win32 because the list of availabe Visuals
(Pixelformats) changes after a change in displaymode. The problem
occurs when switching to gamemode and back. Thanks to for pointing this out & providing the fix.

(Oct 3, ’01)
x Fixed bug in XGetVisualInfo(): pixelformats enumerated incorrectly.
Passing 0 as a pixelformat index to DescribePixelFormat gives
unpredictible results (e.g., this fails on the Voodoo opengl32.dll
and always reports 0 as the last available pixelformat index).
Thanks to for pointing this out & providing the fix.

(Oct 3, ’01)
x Fixed bug in glXGetConfig(): pixelformats enumerated incorrectly. The
test was OpenGL support OR draw to window, but should be AND. Thanks
to for pointing this out & providing the fix.

(Sep 28, ’01)
x Fixed glutChangeToSubMenu()/glutChangeToMenuEntry() bug where if you
went back and forth between a submenu and a plain entry, the submenu
wouldn’t be updated properly.

(Sep 28, ’01)
x glutSetIconTitle() is now a nop.

(Sep 28, ’01)
x glutFullScreen() now sets the window as TOPMOST, therefore, the
window will always be on top (this essentially disables alt-tabbing).

(Sep 28, ’01)
x The key repeat ignore flag is now honored correctly.

(Sep 28, ’01)
x Key presses are now reported more accurately and fully, in
particular, modified up events (i.e., SHIFT-2) are now reported
correctly.

(Sep 28, ’01)
x Subwindows nested arbitrarily deep get their keyboard callbacks
correctly now.

(Sep 28, ’01)
x Major rewrite of the window procedure code to clean it up and make
way for other bug fixes.

(Sep 23, ’01)
x Fixed noof example program to use RAND_MAX instead of assumed
max of 2147483647.0. (Now it looks _much_ better!)

(Sep 22, ’01)
x Fixed sunlight example program. globe.raw data file was corrupt,
added a new one.

(Sep 22, ’01)
x Fixed zcomposite example program to print message if overlay
support is not found (instead of crashing).

(Jan 22, ’01)
x Fixed malloc(0) bug in Win32 version of XGetVisualInfo. Thanks
to for bringing this to my attention.

(Dec 12, ’00)
x Added data files for the advanced & advanced97 programs.

(Dec 12, ’00)
x Added Developer Studio 6 project and workspace files for pretty
much everything (the stuff left out was usually unix specific).

(Dec 7, ’00)
x Fixed several compilation problems & corrupt files. Thanks to
for bringing these to my attention and providing
detailed fixes.

(Dec 6, ’00)
x Fixed compiler support for lcc. Thanks to Gordon for bringing
this to my attention and debugging fixes.

(Nov 8, ’00)
x Fixed submenu problem (sometimes the menu callback was not
called for valid items). Thanks to .

(Oct 16, ’00)
x Corrected corrupt duck.iv file. Thanks to Jon Willeke for finding
this problem.

(Sept 27, ’00)
x Fixed bug in processWorkList that could cause a hang. Thanks to

(Sept 26, ’00)
x Added mui DLL project file (thanks to

(Sept 9, ’00)
x Fixed Delete key bug (crash when no keyboard callback was
registered, but a special key callback was). Thanks to
for finding this bug.

(May 18, ’00)
x Fixed subwindow keyboard callbacks.

(May 22, ’97)
o Menus don’t work under Windows 95
x Fixed! Added a unique identifier to each menu item, and a
search function to grab a menu item given the unique identifier.

(May 21, ’97)
o A few minor bug fixes here and there.
x Thanks to and for their help with
this. We now have a DLL!

(Apr 25, ’97)
o DLL version of the library is coming (as soon as I figure out
how to do it — if you know, let me know).
x Thanks to and for their help with
this. We now have a DLL!

(Apr 24, ’97)
x Added returns to KEY_DOWN etc messages so that the F10 key
doesn’t toggle the system menu anymore.

(Apr 7, ’97)
o Palette is incorrect for modes other than TrueColor.
x Fixed this by forcing a default palette in modes that aren’t
Truecolor in order to ‘simulate’ it. The applications
program shouldn’t have to do this IMHO, but I guess we
can’t argue with Microsoft (well, we can, but what good
will it do?).

(Apr 2, ’97)
x Added glut.ide file for Borland users.

(Apr 2, ’97)
x Fixed a bug in the WM_QUERYNEWPALETTE message. Wasn’t
checking for a null colormap, then de-ref’d it. Oops.

(Mar 13, ’97)
o glutTimerFunc:
Currently, GLUT for Win32 programs busy waits when there is
an outstanding timer event (i.e., there is no select()
call). I haven’t found this to be a problem, but I plan to
fix it just because I can’t bear the thought of a busy wait.
x Added a timer event and a wait in the main loop. This fixes
the CPU spike.

(Mar 11, ’97)
x Fixed subwindow visibility. The visibility callback of
subwindows wasn’t being called, now it is.

(Mar 11, ’97)
o glutGetHDC, glutGetHWND:
In order to support additional dialog boxes, wgl fonts, and
a host of other Win32 dependent structures, two functions
have been added that operate on the current window in GLUT.
The first (glutGetHDC) returns a handle to the current
windows device context. The second (glutGetHWND) returns
handle to the current window.
x Took these out to preserve GLUT portability.

(Mar 11, ’97)
x Fixed the glutWarpPointer() coordinates. Were relative to
the screen, now relative to window (client area) origin
(which is what they’re supposed to be).

(Mar 11, ’97)
o glutCreateMenu, glutIdleFunc:
Menu’s are modal in Win32. That is, they don’t allow any
messages to be processed while they are up. Therefore, if
an idle function exists, it will not be called while
processing a menu.
x Fixed! I’ve put in a timer function that fires every
millisecond while a menu is up. The timer function handles
idle and timer events only (which should be the only
functions that are firing when a menu is up anyway).

(Mar 7 ’97)
x Fixed minor bugs tracked down by the example programs.

(Mar 6, ’97)
x Merged 3.3 GLUT for X11 into 3.2 GLUT for Win32. New code
structure allows for EASY merging!

o In Win32, the parent gets the right to set the cursor of
any of its children. Therefore, a child windows cursor
will ‘blink’ between its cursor and its parent.
x Fixed this by checking whether the cursor is in a child
window or not.

(Feb 28 ’97)
o On initial bringup apps are getting 2 display callbacks.
x Fixed by the Fev 28 re-write.

o Some multiple window (not subwindow) functionality is messed up.
See the sphere.exe program.
x Fixed by the Feb 28 re-write.

o GLUT for Win32 supports color index mode ONLY in a paletted
display mode (i.e., 256 or 16 color mode).
x Fixed this in the re-write. If you can get a color index
visual (pixel format) you can use color index mode.

(Feb 28 ’97)
o Quite a few bugs (and incompatibilities) were being caused
by the structure that I used in the previous port of GLUT.
Therefore I decided that it would be best to “get back to
the roots”. I re-implemented most of glut trying to stick
with the structure layed out by Mark. The result is a much
more stable version that passes ALL (!) (except overlay)
the tests provided by Mark. In addition, this new
structure will allow future enhancements by Mark to be
integrated much more quickly into the Win32 version. Also,
I’m now ordering the bugs in reverse, so that the most
recently fixed appear at the top of the list.

o Changed the glutGetModifiers code to produce an error if not
called in the core input callbacks.

o If the alt key is pressed with more than one other modifier key
it acts as if it is stuck — it stays selected until pressed
and released again.

o When a submenu is attached to a menu, sometimes a GPF occurs.
Fixed. Needed to set the submenu before referencing it’s members.

o Kenny: Also, one little problem, I attached the menu to the
right-button, but when the left-button is pressed I detach
it to give the right-button new meaning; if I pop-up the menu and I
don’t want to select anything, like most users, I click off of the
menu to make it disappear. When I do this, I get a GLUT error and
the program terminates because I am altering the menu attachment
from within the button press while the menu is active.
x Fixed. Needed to finish the menu when the user presses the button,
not just when a button is released.

o GLUT for Win32 emulates a middle mouse button by checking if
both mouse buttons are down. This causes a lot of problems with
the menu and other multiple mouse button things.
x Fixed. No more middle mouse button emulation. Perhaps it would
be a good idea to emulate the middle mouse button (if not present)
with a key?

o Added code to accept a user defined icon. If no icon is provided,
a default icon is loaded.

o Shane: Command line options seem to be screwed up. (9/13)
x Fixed. The geometry command line was broken, and so was the
gldebug command line.

o Fixed a bug in the default glut reshape. It was looking for the
parent of the current

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