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775 lines
22 KiB
HTML
775 lines
22 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>Togl Tcl API</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">Togl Tcl API</h1>
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<h2>Contents</h2>
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<ul>
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<li><a href="#tclfuncs">Togl Tcl command</a>
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<li><a href="#toglfuncs">Togl widget commands</a>
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<ul>
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<li><a href="#configuration">Configuration Commands</a>
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<li><a href="#extensions">Extensions Command</a>
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<li><a href="#rendering">Rendering Commands</a>
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<li><a href="#image">Image Commands</a>
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<li><a href="#font">Font Commands</a>
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<li><a href="#overlay">Overlay Commands</a>
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<li><a href="#stereo cmds">OpenGL (Stereo) Commands</a>
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</ul>
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<li><a href="#options">Togl configuration options</a>
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<ul>
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<li><a href="#drawing">Drawing callbacks</a>
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<li><a href="#geometry">Geometry Options</a>
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<li><a href="#timer">Timer Options</a>
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<li><a href="#stereo options">Stereo Options</a>
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<li><a href="#miscellaneous">Miscellaneous Options</a>
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<li><a href="#pixelformat">Pixel Format Options</a>
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</ul>
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</ul>
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<hr>
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<h2><a name="tclfuncs">Togl Tcl command</a></h2>
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<p>
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The togl command creates a new Tk widget, a Tcl command,
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whose name is <var>pathName</var>.
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This command may be used to invoke various operations on the widget.
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<blockquote>
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<code>togl <var>pathName</var> [<a href="#options">options</a>]</code>
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</blockquote>
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If no options are given, a 400 by 400 pixel RGB window is created.
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This command may be used to invoke various operations on the widget.
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<h2><a name="toglfuncs">Togl widget commands</a></h2>
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The following commands are possible for an existing togl widget:
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<h3><a name="configuration">Configuration commands</a></h3>
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<dl>
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<dt><code><var>pathName</var> cget <var>-option</var></code>
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<dd>
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Return current value of given configuration option.
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</dl>
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<dl>
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<dt>
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<code><var>pathName</var> configure</code><br>
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<code><var>pathName</var> configure <var>-option</var></code>
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<dd>
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If no <var>option</var> is given,
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then return information about
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all configuration <a href="#options">options</a>.
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Otherwise,
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return configuration information for given <var>option</var>.
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All configuration information consists of five values:
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the configuration option name,
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the option database name,
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the option database class,
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the default value,
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and the current value.
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</dl>
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<dl>
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<dt><code><var>pathName</var> configure <var>-option</var> <var>value</var></code>
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<dd>
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Reconfigure a Togl widget.
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<var>option</var> may be any one of the options listed below.
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</dl>
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<dl>
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<dt><code><var>pathName</var> contexttag</code>
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<dd>
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Returns an integer that represents the context tag.
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All Togl widgets with the same context tag share display lists.
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</dl>
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<h3><a name="extensions">Extensions command</a></h3>
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<dl>
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<dt><code><var>pathName</var> extensions</code>
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<dd>
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Returns a list of OpenGL extensions available. For example:
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<blockquote><pre><code>
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if {[lsearch [<i>pathName</i> extensions] GL_EXT_bgra] != -1]} {
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....
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}
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</code></pre></blockquote>
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would check if the GL_EXT_bgra extension were supported.
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</dl>
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<h3><a name="rendering">Rendering commands</a></h3>
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<dl>
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<dt><code><var>pathName</var> postredisplay</code>
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<dd>
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Cause the displaycommand callback to be called
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the next time the event loop is idle.
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</dl>
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<dl>
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<dt><code><var>pathName</var> render</code>
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<dd>
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Causes the displaycommand callback to be called for <var>pathName</var>.
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</dl>
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<dl>
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<dt><code><var>pathName</var> swapbuffers</code>
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<dd>
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Causes front/back buffers to be swapped if in double buffer mode.
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And flushes the OpenGL command buffer if in single buffer mode.
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(So this is appropriate to call after every frame is drawn.)
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</dl>
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<dl>
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<dt><code><var>pathName</var> makecurrent</code>
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<dd>
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Make the widget specified by <var>pathName</var> and its OpenGL context
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the current ones.
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This is implicitly called before any callback command is invoked.
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</dl>
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<dl>
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<dt><code><var>pathName</var> copycontextto <var>toPathName</var> <var>mask</var></code>
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<dd>
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Copy a subset of the OpenGL context state from <var>pathName</var> to
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<var>toPathName</var> according the given mask.
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The mask is an integer corresponding to the same values as
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<a href="http://www.opengl.org/sdk/docs/man/xhtml/glPushAttrib.xml">
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glPushAttrib</a>.
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</dl>
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<h3><a name="image">Image commands</a></h3>
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<dl>
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<dt><code><var>pathName</var> takephoto <var>imagename</var></code>
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<dd>
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Copy the contents of the togl window into the given Tk photo image.
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Transparency values are copied and should be fully opaque for windows
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without alpha bitplanes.
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</dl>
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<h3><a name="font">Font commands</a></h3>
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<p>
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These functions provide an interface to the simple bitmap font capabilities
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that every OpenGL implementation provides.
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Better font support is found in other packages, <i>e.g.</i>,
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<a href="http://www.tcl3d.org/">Tcl3D</a>
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or with different <a href="capi.html#font">C APIs</a>.
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<dl>
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<dt><code><var>pathName</var> loadbitmapfont <var>font</var></code>
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<dd>
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<var>font</var> can be any of font descriptions listed in the Tk
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<a href="http://www.tcl.tk/man/tcl8.4/TkCmd/font.htm#M13">font</a> command.
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It returns a togl font object.
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</dl>
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<dl>
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<dt><code><var>pathName</var> unloadbitmapfont <var>toglfont</var></code>
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<dd>
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Releases the OpenGL resources needed by the <var>toglfont</var>.
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</dl>
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<dl>
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<dt><code><var>pathName</var> write <var>toglfont</var> [-pos <var>xyzw</var>] [-color <var>rgba</var>] <var>string</var></code>
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<dd>
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Write the given <var>string</var> in the given <var>toglfont</var>,
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optionally at a particular position, <var>xyzw</var>
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and color, <var>rgba</var>.
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<var>xyzw</var> is either a 2, 3, or 4 element list of numbers.
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<var>rgba</var> is either a 3 or 4 element list of numbers.
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</dl>
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<h3><a name="overlay">Overlay Commands</a></h3>
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<dl>
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<dt><code><var>pathName</var> uselayer <var>layer</var></code>
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<dd>
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This is a variation on the <code>makecurrent</code> command
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that makes the overlay OpenGL context current
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if <var>layer</var> is 2
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and makes the normal OpenGL context current
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if <var>layer</var> is 1.
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</dl>
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<dl>
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<dt><code><var>pathName</var> showoverlay</code>
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<dd>
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Turn on drawing in the overlay planes.
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</dl>
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<dl>
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<dt><code><var>pathName</var> hideoverlay</code>
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<dd>
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Turn off drawing in the overlay planes.
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</dl>
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<dl>
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<dt><code><var>pathName</var> postredisplayoverlay</code>
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<dd>
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Cause the overlay OpenGL context to be redrawn the next time
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the Tcl event loop is idle.
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</dl>
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<dl>
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<dt><code><var>pathName</var> renderoverlay</code>
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<dd>
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Causes the overlaydisplaycommand callback to be called for <var>pathName</var>.
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</dl>
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<dl>
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<dt><code><var>pathName</var> existsoverlay</code>
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<dd>
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Return true if togl widget has overlay planes.
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</dl>
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<dl>
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<dt><code><var>pathName</var> ismappedoverlay</code>
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<dd>
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Return true if overlay planes are shown.
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</dl>
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<dl>
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<dt><code><var>pathName</var> getoverlaytransparentvalue</code>
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<dd>
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Return overlay plane's transparent pixel value.
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</dl>
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<h3><a name="stereo cmds">OpenGL (Stereo) Commands</a></h3>
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These commands exist to support stereo rendering.
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Just replace select OpenGL calls with the Togl versions
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and stereo rendering will magically work. And don't forget
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to update the <a href="#stereo options">stereo options</a>.
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<dl>
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<dt><code><var>pathName</var> drawbuffer <var>mode</var></code>
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<dd>
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Replaces calls to
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<a href="http://www.opengl.org/sdk/docs/man/xhtml/glDrawBuffer.xml">
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glDrawBuffer</a>.
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The mode is an integer.
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</dl>
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<dl>
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<dt><code><var>pathName</var> clear <var>mask</var></code>
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<dd>
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Replaces calls to
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<a href="http://www.opengl.org/sdk/docs/man/xhtml/glClear.xml">
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glClear</a>.
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The mask is an integer.
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</dl>
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<dl>
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<dt><code><var>pathName</var> frustum <var>left right bottom top near far</var></code>
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<dd>
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Replaces calls to
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<a href="http://www.opengl.org/sdk/docs/man/xhtml/glFrustum.xml">
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glFrustum</a>.
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</dl>
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<dl>
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<dt><code><var>pathName</var> ortho <var>left right bottom top near far</var></code>
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<dd>
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Replaces calls to
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<a href="http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml">
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glOrtho</a>.
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</dl>
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<dl>
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<dt><code><var>pathName</var> numeyes</code>
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<dd>
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Returns numbers of eyes — basically,
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2 for stereo views and 1 for all others,
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except some stereo views only need one eye from OpenGL.
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</dl>
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<h2><a name="options">Togl configuration options</a></h2>
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Togl's configuration options can be separated into several categories:
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geometry, pixel format, and other.
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The pixel format related options can only be set at widget creation time.
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The other options can be changed dynamically
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by the <code><var>pathName</var> configure</code> command (see above).
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<h3><a name="drawing">Drawing callbacks</a></h3>
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<table border="0">
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<thead>
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<tr valign="top">
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<th>Option</th>
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<th>Default</th>
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<th>Comments</th>
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</tr>
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</thead>
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<tbody>
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<tr valign="top">
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<td><code>-createcommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-create</code>.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-displaycommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-display</code>.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-reshapecommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-reshape</code>.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-destroycommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-destroy</code>.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-overlaydisplaycommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-overlaydisplay</code>.
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</td>
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</tr>
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</tbody>
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</table>
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<h3><a name="geometry">Geometry Options</a></h3>
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<table border="0">
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<thead>
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<tr valign="top">
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<th>Option</th>
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<th>Default</th>
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<th>Comments</th>
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</tr>
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</thead>
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<tbody>
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<tr valign="top">
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<td><code>-width</code></td>
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<td align="center">400</td>
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<td>
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Set width of widget in pixels.
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It may have any of the forms accepted by <b>Tk_GetPixels</b>.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-height</code></td>
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<td align="center">400</td>
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<td>
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Set height of widget in pixels.
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It may have any of the forms accepted by <b>Tk_GetPixels</b>(3).
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</td>
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</tr>
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<tr valign="top">
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<td><code>-setgrid</code></td>
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<td align="center">0</td>
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<td>
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Turn on gridded geometry management for togl widget's toplevel
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window and specify the geometry of the grid.
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See the manual pages for Tk's <b>wm</b>(n) and <b>Tk_SetGrid</b>(3)
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for more information.
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Unlike the <b>text</b> widget,
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the same value is used for both width and height increments.
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</td>
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</tr>
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</tbody>
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</table>
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<h3><a name="timer">Timer Options</a></h3>
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<table>
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<thead>
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<tr valign="top">
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<th>Option</th>
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<th>Default</th>
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<th>Comments</th>
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</tr>
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</thead>
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<tbody>
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<tr valign="top">
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<td><code>-time</code></td>
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<td align="center">1</td>
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<td>
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Specifies the interval, in milliseconds, for
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calling the timer callback function which
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was registered with -timercommand.</td>
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</tr>
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<tr valign="top">
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<td><code>-timercommand</code></td>
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<td align="center">{}</td>
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<td>
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Can be abbreviated <code>-timer</code>.
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</td>
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</tr>
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</tbody>
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</table>
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<h3><a name="stereo options">Stereo Options</a></h3>
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<table>
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<thead>
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<tr valign="top">
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<th>Option</th>
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<th>Default</th>
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<th>Comments</th>
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</tr>
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</thead>
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<tbody>
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<tr valign="top">
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<td><code>-eyeseparation</code></td>
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<td align="center">2.0</td>
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<td>
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Set the distance between the eyes in viewing coordinates.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-convergence</code></td>
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<td align="center">30.0</td>
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<td>
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Set the distance to the screen from the eye in viewing coordinates
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(the distance at which the eyes converge).
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</td>
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</tr>
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</tbody>
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</table>
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<blockquote>
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You'd think these values would be given in physical units,
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but there's no single right way to convert to viewing coordinates
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from physical units.
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So if you're willing to use Tk's idea of the horizontal size of a
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window in millimeters (not always correct),
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you could convert the average eye separation of 63 mm
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to your viewing coordinates, and use that value as the eye separation.
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</blockquote>
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<h3><a name="miscellaneous">Miscellaneous Options</a></h3>
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<table>
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<thead>
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<tr valign="top">
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<th>Option</th>
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<th>Default</th>
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<th>Comments</th>
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</tr>
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</thead>
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<tbody>
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<tr valign="top">
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<td><code>-cursor</code></td>
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<td align="center">""</td>
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<td>
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Set the cursor in the widget window.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-swapinterval</code></td>
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<td align="center">1</td>
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<td>
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Set the minimum swap interval measure in video frame periods.
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The default is 1 for for non-tearing artifacts
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when swapping buffers.
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Use a value of 0 when benchmarking frame rates.
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</td>
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</tr>
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<tr valign="top">
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<td><code>-ident</code></td>
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<td align="center">""</td>
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<td>
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A user identification string. This is used match widgets
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for the <code>-sharecontext</code>
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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>
|
|
</tbody>
|
|
</table>
|
|
|
|
<h3><a name="pixelformat">Pixel Format Options</a></h3>
|
|
|
|
The following options can only be given when the togl widget is created
|
|
— that is, unlike other options,
|
|
the togl widget can not be reconfigured with different values
|
|
for the following options after it is created.
|
|
|
|
<table border="0">
|
|
<thead>
|
|
<tr valign="top">
|
|
<th>Option</th>
|
|
<th>Default</th>
|
|
<th>Comments</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr valign="top">
|
|
<td><code>-rgba</code></td>
|
|
<td align="center">true</td>
|
|
<td>If true, use RGB(A) mode, otherwise use Color Index mode.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-redsize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in red component.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td nowrap="nowrap"><code>-greensize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in green component.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-bluesize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in blue component.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-alpha</code></td>
|
|
<td align="center">1</td>
|
|
<td>
|
|
If true and <code>-rgba</code> is true, request an alpha channel.
|
|
</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-alphasize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in alpha component.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-double</code></td>
|
|
<td align="center">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 valign="top">
|
|
<td><code>-depth</code></td>
|
|
<td align="center">false</td>
|
|
<td>If true, request a depth buffer.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-depthsize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in depth buffer.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-accum</code></td>
|
|
<td align="center">false</td>
|
|
<td>If true, request an accumulation buffer.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-accumredsize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in accumulation buffer red component.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td nowrap="nowrap"><code>-accumgreensize</code></td>
|
|
<td align="center">1</td>
|
|
<td>
|
|
Minimum number of bits in accumulation buffer green component.
|
|
</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-accumbluesize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in accumulation buffer blue component.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-accumalphasize</code></td>
|
|
<td align="center">1</td>
|
|
<td>
|
|
Minimum number of bits in accumulation buffer alpha component.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-stencil</code></td>
|
|
<td align="center">false</td>
|
|
<td>If true, request a stencil buffer.</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-stencilsize</code></td>
|
|
<td align="center">1</td>
|
|
<td>Minimum number of bits in stencil component.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-auxbuffers</code></td>
|
|
<td align="center">0</td>
|
|
<td>Desired number of auxiliary buffers.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-privatecmap</code></td>
|
|
<td align="center">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 valign="top">
|
|
<td><code>-overlay</code></td>
|
|
<td align="center">false</td>
|
|
<td>If true, request overlay planes.</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-stereo</code></td>
|
|
<td align="center">mode</td>
|
|
<td>
|
|
See the <a href="stereo.html">stereo</a> information
|
|
for details about the various modes.
|
|
Stereo parameters are changed with the
|
|
<a href="#stereo options">stereo options</a>.
|
|
<p>
|
|
When using a non-native stereo mode, the OpenGL
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glDrawBuffer.xml">
|
|
glDrawBuffer</a>,
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glClear.xml">
|
|
glClear</a>,
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glFrustum.xml">
|
|
glFrustum</a>, and
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml">
|
|
glOrtho</a> calls
|
|
must be replaced with the Togl
|
|
<a href="#stereo cmds">Tcl</a> or
|
|
<a href="capi.html#stereo">C</a> versions.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3" height="0"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-pbuffer</code></td>
|
|
<td align="center">false</td>
|
|
<td>
|
|
If true, request off-screen framebuffer memory for the graphics.
|
|
The resulting togl widget should not be managed.
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>-largestpbuffer</code></td>
|
|
<td align="center">false</td>
|
|
<td>
|
|
If true, when asking for a pbuffer of a given size
|
|
and there isn't enough framebuffer memory available,
|
|
fallback to the largest size available.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr><td colspan="3" height="0"> </td></tr>
|
|
<tr valign="top">
|
|
<td><code>-multisample</code></td>
|
|
<td align="center">false</td>
|
|
<td>
|
|
If true, request an multisampled rendering context.
|
|
</td>
|
|
</tr>
|
|
|
|
<!--
|
|
<tr valign="top">
|
|
<td><code>-fullscreen</code></td>
|
|
<td align="center">false</td>
|
|
<td>
|
|
If true, request an multisampled rendering context.
|
|
<em>Requires Tcl/Tk 8.5 or newer on UNIX and Microsoft Windows platforms.</em>
|
|
</td>
|
|
</tr>
|
|
-->
|
|
|
|
<tr valign="top">
|
|
<td><code>-indirect</code></td>
|
|
<td align="center">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 valign="top">
|
|
<td><code>-sharelist</code></td>
|
|
<td align="center">""</td>
|
|
<td>
|
|
Togl identification string or window path name
|
|
of an existing Togl widget with which to share display lists.
|
|
If it is not possible to share display lists
|
|
between the two togl widgets
|
|
(depends on the graphics driver and the particular formats),
|
|
it fails.
|
|
</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-sharecontext</code></td>
|
|
<td align="center">""</td>
|
|
<td>
|
|
Togl identification string or window path name
|
|
of an existing Togl widget with which to share the OpenGL context.
|
|
<i>Note: all other pixel format options are ignored.</i>
|
|
</td>
|
|
</tr>
|
|
<tr valign="top">
|
|
<td><code>-pixelformat</code></td>
|
|
<td align="center">0</td>
|
|
<td>
|
|
Set the pixel format to the (platform-dependent) given value.
|
|
This is a backdoor into choosing a particular pixel format
|
|
that was determined by other means.
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
|
|
<hr>
|
|
<a href="http://sourceforge.net/projects/togl">
|
|
<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">
|
|
</a>
|
|
<a href="http://validator.w3.org/check?uri=referer">
|
|
<img src="http://www.w3.org/Icons/valid-html401-blue"
|
|
alt="Valid HTML 4.01 Transitional" height="31" width="88" border="0">
|
|
</a>
|
|
</body>
|
|
</html>
|