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1082 lines
33 KiB
HTML
1082 lines
33 KiB
HTML
<html>
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<!-- vi:set sw=2: -->
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<head>
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<link rev="made" href="brian_e_paul@yahoo.com">
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<link rev="made" href="gregcouch@users.sourceforge.net">
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<title>Togl</title>
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</head>
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<body>
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<center>
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<h1>Togl — a Tk OpenGL widget</h1>
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<h3>Copyright (C) 1996-2002 Brian Paul and Ben Bederson</h3>
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</center>
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<br>
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<h2>Contents</h2>
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<ul>
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<li><a href="#intro">Introduction</a>
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<li><a href="#prereq">Prerequisites</a>
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<li><a href="#getting">Getting Togl</a>
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<li><a href="#mailing">Mailing List</a>
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<li><a href="#using">Using Togl with your Application</a>
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<li><a href="#cfuncs">C Togl Functions</a>
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<li><a href="#tclfuncs">Tcl Togl Functions</a>
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<li><a href="#demo">Demo Programs</a>
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<li><a href="#stereo">Stereo Rendering</a>
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<li><a href="#problems">Common Questions and Problems</a>
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<li><a href="#bugs">Reporting Bugs</a>
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<li><a href="#version">Version History</a>
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<li><a href="#contrib">Contributors</a>
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</ul>
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<br>
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<h2><a name="intro">Introduction</a></h2>
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Togl is a Tk widget for OpenGL rendering.
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Togl was originally based on OGLTK, written by Benjamin Bederson at
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the University of New Mexico.
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Togl adds the new features:
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<ul>
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<li>color-index mode support including color allocation functions
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<li>support for requesting stencil, accumulation, alpha buffers, etc
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<li>multiple OpenGL drawing widgets
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<li>OpenGL extension testing from Tcl
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<li>simple, portable font support
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<li>overlay plane support
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</ul>
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<p>
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Togl allows one to create and manage a special Tk/OpenGL widget
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with Tcl and render into it with a C program. That is,
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a typical Togl program will have Tcl code for managing the user interface
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and a C program for computations and OpenGL rendering.
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<p>
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Togl is copyrighted by
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<a href="http://www.mesa3d.org/brianp/home.html">Brian Paul</a>
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<a href="mailto:brian_e_paul@yahoo.com">(brian_e_paul@yahoo.com)</a> and
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<a href="http://www.cs.umd.edu/~bederson/">Benjamin Bederson</a>
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<a href="mailto:bederson@cs.umd.edu">(bederson@cs.umd.edu)</a>.
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See the LICENSE file for details.
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<p>
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The <a href="http://www.sourceforge.net/projects/togl/">
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Togl project</a> and
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<a href="http://togl.sourceforge.net">home page</a> are
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hosted by <a href="http://www.sourceforge.net">SourceForge</a>.
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<br>
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<h2><a name="prereq">Prerequisites</a></h2>
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<p>
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You should have
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<a href="http://www.tcl.tk/">Tcl and Tk</a>
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installed on your computer. Togl works with Tcl/Tk
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version 8.0 and up. The Mac OS X version requires version 8.4.
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<p>
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You must also have
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<a href="http://www.opengl.org">OpenGL</a> or
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<a href="http://www.mesa3d.org">Mesa</a>
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(a free alternative to OpenGL) installed on your computer.
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<p>
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One should be familiar with Tcl, Tk, OpenGL, and C programming to use Togl
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effectively.
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<br>
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<h2><a name="getting">Getting Togl</a></h2>
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<p>
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The current version of Togl is 1.7.
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Togl can be downloaded from
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<a href="http://sourceforge.net/project/showfiles.php?group_id=519">
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SourceForge</a>.
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<br>
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<h2><a name="mailing">Mailing list</a></h2>
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<p>
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See the <a href="http://www.sourceforge.net/projects/togl/">
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Togl project at SourceForge</a> for mailing list information.
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<br>
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<h2><a name="using">Using Togl With Your Application</a></h2>
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<p>
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There are basically two ways of using Togl with your application:
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<ul>
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<li>
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Link or "compile in" Togl with your executable or shared library. In this
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case you must call Togl_Init() from your C code to initialize Togl. This
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is the way the included Togl examples are built.
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<li>
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Install the Togl shared library and pkgIndex.tcl file
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(using <em>make install</em>) and then load it into <i>wish</i> using
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<i>package require Togl</i>.
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Then, before creating the Togl widget, call functions in your application
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code (also a compiled into a shared library and loaded into <i>wish</i>)
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to setup the Togl widget for the OpenGL rendering.
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Create the blank Togl widget,
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and then you're managing redraws and buffer swapping from the Tcl level.
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</ul>
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Since Togl is compiled into a shared library using the Tcl/Tk stubs-interface,
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the same binary can be used with any version of Tck/Tk from 8.06 and up.
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See <code>README.stubs</code> for more info.
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<h3>Unix/X11 usage</h3>
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<p>
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Unix/X systems only need the <code>togl.c</code>, <code>togl.h</code>
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and the public Tcl/Tk include files.
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<h3>Windows 95/NT/2000/XP usage</h3>
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<p>
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Windows platforms need <code>tkWinInt.h</code>
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and other internal Tk header files. So you need a Tcl/Tk
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source distribution in addition to the Togl distribution
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(or copy over the various include files).
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<p>
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Here's the minimal way to build Togl with Tcl/Tk
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using the <a href="http://gcc.gnu.org">gcc</a> that is distributed
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as part of the <a href="http://cygwin.com/">cygwin</a> tools
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(<a href="www.microsoft.com">Microsoft</a>'s compilers work too):
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<blockquote><code><pre>
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VER=8.4.12
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SRCDIR=`pwd`
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cd $SRCDIR/tcl$VER/win
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env 'CC=gcc -mno-cygwin' ./configure --enable-threads
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make libtclstub84.a
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cd $SRCDIR/tk$VER/win
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env 'CC=gcc -mno-cygwin' ./configure --enable-threads
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make libtkstub84.a
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cd $SRCDIR/Togl
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env 'CC=gcc -mno-cygwin' ./configure --with-tcl=../tcl$VER/win --with-tk=../tk$VER/win
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make
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</pre></code></blockquote>
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The resulting <code>Togl17.dll</code> and <code>pkgIndex.tcl</code>
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should be installed into your Tcl distribution just like any other package.
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<h3>Mac OS X usage</h3>
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<p>
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These special instructions are for building the Aqua version of Togl.
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Mac OS X needs <code>tkMacOSXInt.h</code>
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and other internal Tk header files. Unfortunately, the Tcl and Tk
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frameworks that Apple distributes are missing the internal headers.
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So you need a Tcl/Tk source distribution in addition to the Togl
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distribution (or copy over the various include files).
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You would probably want a newer version of Tcl and Tk anyway
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because each minor revision of 8.4 has many Aqua bug fixes.
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<p>
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Here's one way to build Tcl, Tk, and Togl on Mac OS X (assuming they
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are all in the same directory) to install in your home directory:
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<blockquote><code><pre>
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VER=8.4.12
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mkdir -p ~/bin
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make -C tcl$VER/macosx install PREFIX="${HOME}" INSTALL_PATH="${HOME}/Library/Frameworks"
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make -C tk$VER/macosx install PREFIX="${HOME}" INSTALL_PATH="${HOME}/Library/Frameworks"
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(cd Togl; ./configure --prefix="${HOME}")
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make -C Togl install
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</pre></code></blockquote>
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<br>
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<h2><a name="cfuncs">C Togl Functions</a></h2>
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<p>
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These are the Togl functions one may call from a C program.
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<blockquote>
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<code>
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#include "togl.h"
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</code>
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</blockquote>
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<p>
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For portability, you should include the togl.h header
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before any other OpenGL header so that various
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Windows 95/NT/2000/XP stuff falls into place.
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<h3>Setup and Initialization Functions</h3>
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<dl>
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<dt><code>int Togl_Init(Tcl_Interp *interp)</code>
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<dd>
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Initializes the Togl module. This is typically called from the
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Tk_Main() function
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or via Tcl's <code>package require</code> command.
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</dl>
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<dl>
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<dt><code>void Togl_CreateFunc(Togl_Callback *proc)
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<br>
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void Togl_DisplayFunc(Togl_Callback *proc)
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<br>
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void Togl_ReshapeFunc(Togl_Callback *proc)
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<br>
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void Togl_DestroyFunc(Togl_Callback *proc)
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</code>
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<dd>
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Register C functions to be called by Tcl/Tk when a widget is realized,
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must be redrawn, is resized, or is destroyed respectively.
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<p>
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Each C callback must be of the form:
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<pre>
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void callback(Togl *togl)
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{
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...your code...
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}
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</pre>
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</dl>
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<dl>
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<dt><code>void Togl_TimerFunc(Togl_Callback *proc)</code>
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<dd>
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Register a C timer callback function which will be called every
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<em>n</em> milliseconds. The interval <em>n</em> is specified
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by the <code>-time</code> option to the Togl Tcl command.
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<p>
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The C callback must be of the form:
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<pre>
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void my_timer_callback(Togl *togl)
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{
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...your code...
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}
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</pre>
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</dl>
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<dl>
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<dt><code>void Togl_ResetDefaultCallbacks(void)</code>
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<dd>
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Reset all default callback pointers to NULL.
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</dl>
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<dl>
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<dt><code>void Togl_CreateCommand(char *cmd_name, Togl_CmdProc *cmd_proc)</code>
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<dd>
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Used to create a new Togl sub-command. The C function which implements
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the command must be of the form:
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<p>
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<pre>
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int callback(Togl *togl, int argc, char *argv[])
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{
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...your code...
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return TCL_OK or TCL_ERROR;
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}
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</pre>
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</dl>
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<h3>Drawing-related Commands</h3>
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<dl>
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<dt><code>void Togl_PostRedisplay(Togl *togl)</code>
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<dd>
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Signals that the widget should be redrawn. When Tk is next idle the
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user's C render callback will be invoked. This is typically called
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from within a Togl sub-command which was registered with
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Togl_CreateCommand().
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</dl>
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<dl>
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<dt><code>void Togl_SwapBuffers(const Togl *togl)</code>
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<dd>
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Swaps the front and back color buffers for a double-buffered widget.
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glFlush() is executed if the window is single-buffered. This is
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typically called in the rendering function which was registered with
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Togl_DisplayFunc().
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</dl>
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<dl>
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<dt><code>void Togl_MakeCurrent(const Togl *togl)</code>
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<dd>
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Sets the current rendering context to the given widget. This is done
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automatically before the Togl callback functions are called. So the
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call is only needed if you have multiple widgets with separate OpenGL
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contexts. If the argument is NULL, then the rendering context is cleared
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and subsequent OpenGL commands will fail.
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</dl>
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<h3>Query Functions</h3>
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<dl>
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<dt><code>char *Togl_Ident(const Togl *togl)</code>
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<dd>
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Returns a pointer to the identification string associated with a Togl
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widget or NULL if there's no identifier string.
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</dl>
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<dl>
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<dt><code>int Togl_Width(const Togl *togl)</code>
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<dd>
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Returns the width of the given Togl widget. Typically called in the
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function registered with Togl_ReshapeFunc().
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</dl>
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<dl>
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<dt><code>int Togl_Height(const Togl *togl)</code>
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<dd>
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Returns the height of the given Togl widget. Typically called in the
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function registered with Togl_ReshapeFunc().
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</dl>
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<dl>
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<dt><code>Tcl_Interp *Togl_Interp(const Togl *togl)</code>
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<dd>
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Returns the Tcl interpreter associated with the given Togl widget.
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</dl>
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<dl>
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<dt>
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<code>Tk_Window Togl_TkWin(const Togl *togl)</code>
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<dd>
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Returns the Tk window associated with the given Togl widget.
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</dl>
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<h3>Color Index Mode Functions</h3>
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<p>
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These functions are only used for color index mode.
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<dl>
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<dt><code>unsigned long Togl_AllocColor(Togl *togl, float red, float green, float blue)</code>
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<dd>
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Allocate a color from a read-only colormap. Given a color specified
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by red, green, and blue return a colormap index (aka pixel value)
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whose entry most closely matches the red, green, blue color. Red,
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green, and blue are values in [0,1]. This function is only used in
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color index mode when the <code>-privatecmap</code> option is false.
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</dl>
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<dl>
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<dt><code>void Togl_FreeColor(Togl *togl, unsigned long index)</code>
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<dd>
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Free a color in a read-only colormap. Index is a value which was
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returned by the Togl_AllocColor() function. This function is only
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used in color index mode when the <code>-privatecmap</code> option
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is false.
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</dl>
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<dl>
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<dt><code>void Togl_SetColor(Togl *togl,
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int index, float red, float green, float blue)</code>
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<dd>
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Load the colormap entry specified by index with the given red, green
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and blue values. Red, green, and blue are values in [0,1]. This
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function is only used in color index mode when the
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<code>-privatecmap</code> option is true.
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</dl>
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<h3>Font Functions</h3>
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<dl>
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<dt><code>GLuint Togl_LoadBitmapFont(Togl *togl,
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const char *fontname)</code>
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<dd>
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Load the named font as a set of glBitmap display lists.
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<var>fontname</var> may be one of
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<code>
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<ul>
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<li>TOGL_BITMAP_8_BY_13
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<li>TOGL_BITMAP_9_BY_15
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<li>TOGL_BITMAP_TIMES_ROMAN_10
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<li>TOGL_BITMAP_TIMES_ROMAN_24
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<li>TOGL_BITMAP_HELVETICA_10
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<li>TOGL_BITMAP_HELVETICA_12
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<li>TOGL_BITMAP_HELVETICA_18
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</code>
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<li>or any X11 font name
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</ul>
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Zero is returned if this function fails.
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<br>
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After Togl_LoadBitmapFont() has been called, returning <var>fontbase</var>,
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you can render a string <em>s</em> with:
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<blockquote>
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<code>
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glListBase(fontbase);
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<br>
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glCallLists(strlen(s), GL_BYTE, s);
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</code>
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</blockquote>
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To maximize the portability of your application it is best to use one
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of the predefined TOGL_BITMAP_* fonts.
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</dl>
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<dl>
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<dt><code>void Togl_UnloadBitmapFont(Togl *togl, GLuint fontbase)
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</code>
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<dd>
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Destroys the bitmap display lists created by by Togl_LoadBitmapFont().
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</dl>
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<h3>Client Data Functions</h3>
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<dl>
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<dt><code>void Togl_SetClientData(Togl *togl, ClientData clientData)</code>
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<dd>
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<em>clientData</em> is a pointer to an arbitrary user data structure.
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Each Togl struct has such a pointer.
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This function sets the Togl widget's client data pointer.
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</dl>
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<dl>
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<dt><code>ClientData Togl_GetClientData(const Togl *togl)</code>
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<dd>
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<em>clientData</em> is a pointer to an arbitrary user data structure.
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Each Togl struct has such a pointer.
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This function returns the Togl widget's client data pointer.
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</dl>
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<dl>
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<dt><code>void Togl_ClientData(ClientData clientData)</code>
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<dd>
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<em>clientData</em> is a pointer to an arbitrary user data structure.
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Set default client data pointer for subsequent new Togl widgets.
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Default value is NULL.
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</dl>
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<h3>Overlay Functions</h3>
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<p>
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These functions are modelled after GLUT's overlay sub-API.
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<dl>
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<dt><code>void Togl_UseLayer(Togl *togl, int layer)</code>
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<dd>
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Select the layer into which subsequent OpenGL rendering will be
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directed. <em>layer</em> may be either <em>TOGL_OVERLAY</em> or
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<em>TOGL_NORMAL</em>.
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</dl>
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<dl>
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<dt><code>void Togl_ShowOverlay(Togl *togl)</code>
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<dd>
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Display the overlay planes, if any.
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</dl>
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<dl>
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<dt><code>void Togl_HideOverlay(Togl *togl)</code>
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<dd>
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Hide the overlay planes, if any.
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</dl>
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<dl>
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<dt><code>void Togl_PostOverlayRedisplay(Togl *togl)</code>
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<dd>
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Signal that the overlay planes should be redraw.
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When Tk is next idle the user's C overlay display callback will be invoked.
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This is typically called from within a Togl sub-command which was
|
|
registered with Togl_CreateCommand().
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>void Togl_OverlayDisplayFunc(Togl_Callback *proc)</code>
|
|
<dd>
|
|
Registers the C callback function which should be called to redraw the
|
|
overlay planes. This is the function which will be called in
|
|
response to Togl_PostOverlayRedisplay().
|
|
The callback must be of the form:
|
|
<p>
|
|
<pre>
|
|
void RedrawOverlay(Togl *togl)
|
|
{
|
|
...your code...
|
|
}
|
|
</pre>
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>int Togl_ExistsOverlay(Togl *togl)</code>
|
|
<dd>
|
|
Returns 1 if overlay planes exist, 0 otherwise.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>int Togl_GetOverlayTransparentValue(const Togl *togl)</code>
|
|
<dd>
|
|
Returns the color index of the overlay's transparent pixel value.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>int Togl_IsMappedOverlay(const Togl *togl)</code>
|
|
<dd>
|
|
Returns 1 if the overlay planes are currently displayed, 0 otherwise.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>unsigned long Togl_AllocColorOverlay(const Togl *togl,
|
|
float red, float green, float blue)</code>
|
|
<dd>
|
|
Allocate a color in the overlay planes. Red, green, and blue are
|
|
values in [0,1]. Return the color index or -1 if the allocation
|
|
fails.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>void Togl_FreeColorOverlay(const Togl *togl, unsigned long index)</code>
|
|
<dd>
|
|
Free a color which was allocated with Togl_AllocColorOverlay().
|
|
</dl>
|
|
|
|
|
|
<h3>X11-only Functions</h3>
|
|
|
|
<p>
|
|
These functions are only implemented on systems using the X Window System.
|
|
We recommend that you avoid using these functions in your application since
|
|
they are not portable to other operating/window systems
|
|
(use <code>Togl_TkWin()</code> and normal Tk functions instead).
|
|
<p>
|
|
|
|
<dl>
|
|
<dt><code>Display *Togl_Display(const Togl *togl)</code>
|
|
<dd>
|
|
Returns the X Display of a Togl widget.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>Screen *Togl_Screen(const Togl *togl)</code>
|
|
<dd>
|
|
Returns the X Screen of a Togl widget.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>int Togl_ScreenNumber(const Togl *togl)</code>
|
|
<dd>
|
|
Returns the X screen number of a Togl widget.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code>Colormap Togl_Colormap(const Togl *togl)</code>
|
|
<dd>
|
|
Returns the X Colormap used by a Togl widget.
|
|
</dl>
|
|
|
|
|
|
<h3>Postscript Output</h3>
|
|
<p>
|
|
|
|
<dl>
|
|
<dt><code>int Togl_DumpToEpsFile(const Togl *togl,
|
|
const char *filename, int rgbFlag, void (*user_redraw)())</code>
|
|
<dd>
|
|
Generate an encapsulated Postscript file of the image in a Togl widget.
|
|
<em>filename</em> is the name of the file to generate.
|
|
If <em>rgbFlag</em> is non-zero then an RGB image file is written,
|
|
else a grayscale image file is written.
|
|
<em>user_redraw</em> is a pointer to the function which will render the
|
|
desired image. This will typically be the same as the function passed
|
|
to Togl_DisplayFunc().
|
|
</dl>
|
|
|
|
|
|
<br>
|
|
<h2><a name="tclfuncs">Tcl Togl commands</a></h2>
|
|
|
|
<p>
|
|
These are the Togl commands one may call from a Tcl program.
|
|
|
|
<dl>
|
|
<dt><code>togl <var>pathName</var> [options]</code>
|
|
<dd>
|
|
Creates a new togl widget with name <var>pathName</var> and
|
|
an optional list of configuration options. Options include:
|
|
<p>
|
|
<table border="0">
|
|
<colgroup span="3">
|
|
<col align="left">
|
|
<col align="center">
|
|
<col align="left">
|
|
</colgroup>
|
|
<tr>
|
|
<th>Option</th> <th>Default</th> <th>Comments</th>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-width</code></td> <td align="center">400</td> <td>
|
|
Width of widget in pixels.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-height</code></td> <td>400</td> <td>
|
|
Height of widget in pixels.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-ident</code></td> <td>""</td> <td>
|
|
A user identification string. This is used match widgets
|
|
for the <code>-sharecontext</code>
|
|
and the <code>-sharelist</code> options (see below).
|
|
This is also useful in your callback functions
|
|
to determine which Togl widget is the caller.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-rgba</code></td> <td>true</td> <td>
|
|
If true, use RGB(A) mode, otherwise use Color Index mode.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-redsize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in red component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td nowrap="1"><code>-greensize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in green component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-bluesize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in blue component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-alpha</code></td> <td>1</td> <td>
|
|
If true and <code>-rgba</code> is true, request an alpha channel.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-alphasize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in alpha component.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-double</code></td> <td>false</td> <td>
|
|
If true, request a double-buffered window, otherwise
|
|
request a single-buffered window.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-depth</code></td> <td>false</td> <td>
|
|
If true, request a depth buffer.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-depthsize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in depth buffer.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-accum</code></td> <td>false</td> <td>
|
|
If true, request an accumulation buffer.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-accumredsize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in accumulation buffer red component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td nowrap="1"><code>-accumgreensize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in accumulation buffer green component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-accumbluesize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in accumulation buffer blue component.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-accumalphasize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in accumulation buffer alpha component.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-stencil</code></td> <td>false</td> <td>
|
|
If true, request a stencil buffer.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-stencilsize</code></td> <td>1</td> <td>
|
|
Minimum number of bits in stencil component.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-auxbuffers</code></td> <td>0</td> <td>
|
|
Desired number of auxiliary buffers.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-privatecmap</code></td> <td>false</td> <td>
|
|
Only applicable in color index mode.
|
|
If false, use a shared read-only colormap.
|
|
If true, use a private read/write colormap.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-overlay</code></td> <td>false</td> <td>
|
|
If true, request overlay planes.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-stereo</code></td> <td>false</td> <td>
|
|
If true, request a stereo-capable window.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-oldstereo</code></td> <td>false</td> <td>
|
|
On SGI workstations only: if true, request divided-screen stereo.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-time</code></td> <td>1</td> <td>
|
|
Specifies the interval, in milliseconds, for
|
|
calling the C timer callback function which
|
|
was registered with Togl_TimerFunc.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-sharelist</code></td> <td>""</td> <td>
|
|
Name of an existing Togl widget with which to
|
|
share display lists.
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-sharecontext</code></td> <td>""</td> <td>
|
|
Name of an existing Togl widget with which to
|
|
share the OpenGL context. NOTE: most other
|
|
attributes such as double buffering, RGBA vs CI,
|
|
ancillary buffer specs, etc are then ignored.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-indirect</code></td> <td>false</td> <td>
|
|
If present, request an indirect rendering context.
|
|
A direct rendering context is normally requested.
|
|
<em>Only significant on Unix/X11.</em>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-cursor</code></td> <td>""</td> <td>
|
|
Set the cursor in the widget window.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan=3> </td></tr>
|
|
<tr>
|
|
<td><code>-pixelformat</code></td> <td>0</td> <td>
|
|
Set the pixel format to the (platform-dependent) given value.</td>
|
|
</tr>
|
|
|
|
</table>
|
|
</dl>
|
|
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> configure</code>
|
|
<dd>
|
|
Returns all configuration records for the named togl widget.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> configure <var>-option</var></code>
|
|
<dd>
|
|
Returns configuration information for the specified <var>option</var>
|
|
which may be one of:
|
|
<dl>
|
|
<dt><code>-width</code>
|
|
<dd>
|
|
Returns the width configuration of the widget in the form:
|
|
<br>
|
|
<code>-width width Width <var>W</var> <var>w</var></code>
|
|
<br>
|
|
where <var>W</var> is the default width in pixels
|
|
and <var>w</var> is the current width in pixels
|
|
</dl>
|
|
<dl>
|
|
<dt><code>-height</code>
|
|
<dd>
|
|
Returns the height configuration of the widget in the form:
|
|
<br>
|
|
<code>-height height Height <var>H</var> <var>h</var></code>
|
|
<br>
|
|
where <var>H</var> is the default height in pixels
|
|
and <var>h</var> is the current height in pixels
|
|
</dl>
|
|
<dl>
|
|
<dt><code>-extensions</code>
|
|
<dd>
|
|
Returns a list of OpenGL extensions available. For example:
|
|
<code>GL_EXT_polygon_offset GL_EXT_vertex_array</code>
|
|
</dl>
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> configure <var>-option</var> <var>value</var></code>
|
|
<dd>
|
|
Reconfigure a Togl widget. <var>option</var> may be any one of the
|
|
options listed in the <code>togl</code> command above.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> render</code>
|
|
<dd>
|
|
Causes the render callback function to be called for <var>pathName</var>.
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> swapbuffers</code>
|
|
<dd>
|
|
Causes front/back buffers to be swapped if in double buffer mode.
|
|
And flushes the OpenGL command buffer if in single buffer mode.
|
|
(So this is appropriate to call after every frame is drawn.)
|
|
</dl>
|
|
|
|
<dl>
|
|
<dt><code><var>pathName</var> makecurrent</code>
|
|
<dd>
|
|
Make the widget specified by <var>pathName</var> and its OpenGL context
|
|
the current ones.
|
|
</dl>
|
|
|
|
|
|
<br>
|
|
<h2><a name="demo">Demo Programs</a></h2>
|
|
|
|
<p>
|
|
There are six demo programs:
|
|
|
|
<blockquote>
|
|
<table border="0">
|
|
<colgroup span="2">
|
|
<col align="left">
|
|
<col align="left">
|
|
</colgroup>
|
|
<tr>
|
|
<td>double.tcl</td>
|
|
<td>— compares single vs double buffering with two Togl widgets</td>
|
|
</tr>
|
|
<tr>
|
|
<td>texture.tcl</td>
|
|
<td>— lets you play with texture mapping options</td>
|
|
</tr>
|
|
<tr>
|
|
<td>index.tcl</td>
|
|
<td>— demo of using color index mode</td>
|
|
</tr>
|
|
<tr>
|
|
<td>overlay.tcl</td>
|
|
<td>— example of using overlay planes (requires overlay hardware)</td>
|
|
</tr>
|
|
<tr>
|
|
<td>stereo.tcl</td>
|
|
<td>— stereo example</td>
|
|
</tr>
|
|
<tr>
|
|
<td>gears.tcl</td>
|
|
<td>— spinning gears demo</td>
|
|
</tr>
|
|
</table>
|
|
</blockquote>
|
|
|
|
<p>
|
|
To compile the demos, edit the Makefile to suit your system, then
|
|
type <code>make demos</code>.
|
|
The demos are compiled into shared libraries,
|
|
that can are loaded into the Tcl interpreter as Tcl/Tk-extensions.
|
|
Demos are started by running the corresponding Tcl script.
|
|
To run a demo just type <code>./double.tcl </code>or <code>./texture.tcl</code> etc.
|
|
|
|
|
|
<br>
|
|
<h2><a name="stereo">Stereo Rendering</a></h2>
|
|
|
|
<p>
|
|
Quad-buffered stereo-in-a-window is supported. Quad-buffer stereo
|
|
is only available on workstation-class graphics cards
|
|
(<a href="http://www.3dlabs.com">3Dlabs</a> Wildcat series,
|
|
<a href="http://www.ati.com">ATI</a> FireGL series,
|
|
<a href="http://www.nvidia.com">NVidia</a> Quadro series,
|
|
and <a href="http://www.sgi.com">SGI</a> workstations).
|
|
Legacy support for divided-screen stereo on SGI workstations is
|
|
available via the <code>-oldstereo</code> option.
|
|
Developers for SGI workstations might also like the
|
|
<a href="http://www.cgl.ucsf.edu/Overview/software.html#autostereo">
|
|
autostereo</a> package to automatically switch the display
|
|
in and out of stereo (other systems already do it automatically).
|
|
<p>
|
|
Full-screen stereo that gaming graphics cards support (ATI Radeon,
|
|
NVidia GeForce) is not supported.
|
|
|
|
<br>
|
|
<h2><a name="problems">Common Questions and Problems</a></h2>
|
|
|
|
<p>
|
|
If you have something to add to this section please let us know.
|
|
|
|
<h3>Bad Match X errors on Sun systems</h3>
|
|
<p>
|
|
There's a bug in Sun's XmuLookupStandardColormap X library function.
|
|
If you compile togl.c with the SOLARIS_BUG symbol defined (-DSOLARIS_BUG)
|
|
this function call will be omitted.
|
|
|
|
|
|
<br>
|
|
<h2><a name="bugs">Reporting Bugs</a></h2>
|
|
|
|
<p>
|
|
There is a bug database on the
|
|
<a href="http://sourceforge.net/projects/togl/">Togl Project Page</a>.
|
|
You may also discuss bugs on the mailing list.
|
|
<p>
|
|
When reporting bugs please provide as much information as possible.
|
|
Also, it's very helpful to us if you can provide an example program
|
|
which demonstrates the problem.
|
|
|
|
|
|
<br>
|
|
<h2><a name="version">Version History</a></h2>
|
|
|
|
<h3>Version 1.0 — March, 1996</h3>
|
|
<ul>
|
|
<li>Initial version
|
|
</ul>
|
|
|
|
<h3>Version 1.1 (never officially released)</h3>
|
|
<ul>
|
|
<li>Added Togl_LoadBitmapFont function
|
|
<li>Fixed a few bugs
|
|
</ul>
|
|
|
|
<h3>Version 1.2 — November, 1996</h3>
|
|
<ul>
|
|
<li>added swapbuffers and makecurrent Tcl commands
|
|
<li>More bug fixes
|
|
<li>Upgraded to support Tcl 7.6 and Tk 4.2
|
|
<li>Added stereo and overlay plane support
|
|
<li>Added Togl_Get/SetClientData() functions
|
|
<li>Added Togl_DestroyFunc()
|
|
</ul>
|
|
|
|
<h3>Version 1.3 — May 2, 1997</h3>
|
|
<ul>
|
|
<li>fixed a bug in Togl_Configure()
|
|
<li>fixed a compilation problem in using Tcl_PkgProvide() with Tcl < 7.4
|
|
<li>new overlay functions: Togl_ExistsOverlay, Togl_GetOverlayTransparentValue,
|
|
Togl_IsMappedOverlay, Togl_AllocColorOverlay, Togl_FreeColorOverlay
|
|
<li>added X11 functions: Togl_Display, Togl_Screen, Togl_ScreenNumber,
|
|
Togl_Colormap
|
|
<li>added Togl_DumpToEpsFile function
|
|
<li>fixed a C++ compilation problem
|
|
<li>more robust overlay code
|
|
<li>added timers (Togl_TimerFunc) from Peter Dern and Elmar Gerwalin
|
|
</ul>
|
|
|
|
<h3>Version 1.4 — September 17, 1997</h3>
|
|
<ul>
|
|
<li>Ported to Windows NT (Robert Casto)
|
|
<li>Updated for Tcl/Tk 8.0
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<li>Added many config flags (-redsize, -depthsize, etc) (Matthias Ott)
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<li>Added Togl_Set*Func() functions to reassign callback functions (Matthias Ott)
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<li>Added Togl_ResetDefaultCallbacks() and Togl_ClientData() functions (Greg Couch)
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</ul>
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<h3>Version 1.5 — September 18, 1998</h3>
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<ul>
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<li>Fixed a few Unix and Windows compilation bugs
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<li>Added Ben Evan's SGI stereo functions
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<li>Multiple expose events now reduced to one redraw
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|
<li>Destroying Togl widgets caused problems, patched by Adrian J. Chung
|
|
<li>Added Togl_TkWin() function
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|
<li>Updated for Tcl/Tk 8.0p2
|
|
<li>Added gears demo from Philip Quaife
|
|
<li>Added <code>-sharelist</code> and <code>-sharecontext</code> config flags
|
|
<li>Fixed a few overlay update bugs
|
|
<li>Added <code>-indirect</code> config flag
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</ul>
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|
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|
<h3>Version 1.6 — May 7, 2003</h3>
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|
<ul>
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|
<li>Added Togl_SetTimerFunc function
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|
<li>Updated for Tcl/Tk 8.0.5 and 8.1
|
|
<li>Context sharing added for Windows
|
|
<li>Macintosh support (by Paul Thiessen)
|
|
<li>Tcl/Tk stubs support — see README.tcl (by Jonas Beskow)
|
|
</ul>
|
|
|
|
<h3>Version 1.7 — Jan 2006</h3>
|
|
<ul>
|
|
<li>Added Mac OS X support
|
|
<li>Enabled asking for quad-buffered stereo pixel formats on all platforms
|
|
(use -oldstereo on SGIs for splitscreen stereo — C API changed too)
|
|
<li>Configuring the cursor is no longer slow
|
|
<li>Added <code>-pixelformat</code> config flag
|
|
<li>Added setgrid support (unfortunately many window managers can't cope with 1x1 pixel grid)
|
|
<li>Only free context when last reference is gone
|
|
<li>Switched to TEA-based configure (instead of editing make files)
|
|
</ul>
|
|
|
|
<h3>Version 2.0 — ??? 2006</h3>
|
|
<ul>
|
|
<li>integrate <a href="http://www.tcl3d.org/">tcl3dTogl</a>'s changes
|
|
</ul>
|
|
|
|
<br>
|
|
<h3>Future plans</h3>
|
|
<ul>
|
|
<li>add callback command options for create/display/reshape/destroy
|
|
<li>add vertical sync control
|
|
<li>multisampling support (can be worked-around by passing in a pixelformat)
|
|
<li>replace EPS support with TK photo image support
|
|
<li>simplify C API by requiring callback command options
|
|
<li>stubify C API
|
|
<li>Use Tcl object interface for callbacks
|
|
<li>allow (require?) private colormap to given with TK photo image
|
|
</ul>
|
|
|
|
|
|
<br>
|
|
<h2><a name="contrib">Contributors</a></h2>
|
|
|
|
<p>
|
|
Several people have contributed new features to Togl. Among them are:
|
|
|
|
<ul>
|
|
<li>Ramon Ramsan — overlay plane support
|
|
<li>Miguel A. De Riera Pasenau — more overlay functions, X11 functions
|
|
and EPS output
|
|
<li>Peter Dern and Elmar Gerwalin — Togl_TimerFunc and related code
|
|
<li>Robert Casto — Windows NT port
|
|
<li>Geza Groma — Windows 95/NT patches
|
|
<li>Ben Evans — SGI stereo support
|
|
<li>Paul Thiessen — Macintosh support
|
|
<li>Jonas Beskow — Tcl/Tk stubs support
|
|
<li>Paul Kienzle — TEA debugging and patches
|
|
<li>Greg Couch — version 1.7
|
|
</ul>
|
|
|
|
Many others have contributed bug fixes. Thanks for your contributions!
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|
|
|
<br>
|
|
<hr>
|
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Last edited on 25 October 2005 by Greg Couch.
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</body>
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</html>
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