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181 lines
5.4 KiB
HTML
181 lines
5.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- vi:set sw=2: -->
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<!--
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Copyright (C) 1996-2002 Brian Paul and Ben Bederson
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Copyright (C) 2005-2009 Greg Couch
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See the LICENSE file for copyright details.
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-->
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
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<title>Using the Togl Widget</title>
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</head>
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<body>
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<script type="text/javascript" src="header.js"></script>
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<script type="text/javascript">
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NavigationBar();
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</script>
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<h1 align="center">Using the Togl Widget</h1>
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<h2>Contents</h2>
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<ul>
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<li><a href="#using">Using Togl With Your Application</a>
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<li><a href="#examples">Examples</a>
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<li><a href="tclapi.html">Tcl API</a>
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<li><a href="capi.html">C API</a>
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</ul>
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<hr>
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<h2><a name="using">Using Togl With Your Application</a></h2>
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<p>
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First, double check that you have all of the
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<a href="download.html#prereq">prerequisites</a>
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and that you have
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<a href="download.html#building">compiled and installed</a> Togl.
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<p>
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Then, Togl acts like any other extension package —
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to load it, you use the Tcl <code>package</code> command:
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<blockquote>
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<code>package require Togl 2.0</code>
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</blockquote>
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After that, you can create a Togl widget just like any other Tk widget.
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<h2><a name="examples">Examples</a></h2>
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<p>
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There are eight working examples:
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<blockquote>
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<table border="0">
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<tr>
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<td>double.tcl</td>
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<td>— compares single vs double buffering with two Togl widgets</td>
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</tr>
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<tr>
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<td>texture.tcl</td>
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<td>— lets you play with texture mapping options</td>
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</tr>
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<tr>
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<td>index.tcl</td>
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<td>— example of using color index mode</td>
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</tr>
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<tr>
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<td>overlay.tcl</td>
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<td>— example of using overlay planes (requires overlay hardware)</td>
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</tr>
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<tr>
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<td>stereo.tcl</td>
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<td>— stereo example</td>
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</tr>
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<tr>
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<td>gears.tcl</td>
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<td>— spinning gears example</td>
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</tr>
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<tr>
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<td>multisample.tcl</td>
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<td>— multisampling example</td>
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</tr>
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<tr>
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<td>pbuffer.tcl</td>
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<td>— pbuffer (off-screen rendering) example</td>
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</tr>
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</table>
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</blockquote>
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<p>
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Each example consists of two files: a Tcl script for the user interface,
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and a Tcl C package that does the OpenGL drawing.
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To compile the examples, type <code>make examples</code>
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in the Togl source directory.
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The C packages are compiled into shared libraries
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that are loaded into the Tcl interpreter as Tcl/Tk-extensions.
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The examples are started by running the corrsponding Tcl script:
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just type <code>./double.tcl</code>
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(or <code>./texture.tcl</code> <i>etc.</i>)
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or run under one of the Tcl interpreters, <i>i.e.</i>,
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<code>tclsh</code> or <code>wish</code>.
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For example:
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<blockquote>
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<code>tclsh84 double.tcl</code>
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</blockquote>
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<p>
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Other examples that use Tcl for OpenGL drawing can be found in the
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<a href="http://tcl3d.org/html/demos.html">Tcl3D demos</a>.
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<h3><a name="callbacks">Togl callbacks</a></h3>
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<p>
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All of the examples have similar structure.
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First they create the user interface with one or more Togl widgets.
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Each Togl widget is configured with the desired pixel format
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and several callback commands (not all are needed):
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<table>
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<tr>
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<td><code>-createcommand</code></td>
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<td>
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Called when Togl widget is mapped —
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when it is safe to initialize the OpenGL context.
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</td>
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</tr>
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<tr>
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<td><code>-reshapecommand</code></td>
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<td>
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Called when the Togl widget is resized —
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when the OpenGL context's viewport needs to be changed.
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</td>
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</tr>
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<tr>
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<td><code>-displaycommand</code></td>
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<td>
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Called when the contents of the Togl widget needs to be redrawn.
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Redraws are normally delayed to be when the Tcl event loop is idle
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(see the togl widget's <code>postredisplay</code> command),
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or as the result of an explicit call to the togl's widgets
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<code>render</code> command.
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</td>
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</tr>
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<tr>
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<td><code>-destroycommand</code></td>
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<td>
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Called when the Togl widget is destroyed.
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While OpenGL frees display lists and other resources,
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sometimes there's some associated state that is no longer needed.
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</td>
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</tr>
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<tr>
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<td><code>-timercommand</code></td>
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<td>
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Called every <i>n</i> milliseconds
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as given by the <code>-time</code> option.
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</td>
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</tr>
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<tr>
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<td><code>-overlaydisplaycommand</code></td>
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<td>
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Called when the overlay planes needs to be redrawn.
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The overlay planes are created and reshaped
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at the same time as the main OpenGL context.
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</td>
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</tr>
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</table>
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Typically, only <code>-createcommand</code>, <code>-reshapecommand</code>
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and <code>-displaycommand</code> are used.
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<hr>
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<a href="http://sourceforge.net/projects/togl">
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<img src="http://sflogo.sourceforge.net/sflogo.php?group_id=519&type=13" width="120" height="30" border="0" alt="Get Togl at SourceForge.net. Fast, secure and Free Open Source software downloads">
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</a>
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