mirror of
https://github.com/NGSolve/netgen.git
synced 2024-09-23 10:02:49 +05:00
653 lines
21 KiB
HTML
653 lines
21 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
|
||
|
|
"http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- vi:set sw=2: -->
|
||
|
|
<!--
|
||
|
|
Copyright (C) 1996-2002 Brian Paul and Ben Bederson
|
||
|
|
Copyright (C) 2005-2009 Greg Couch
|
||
|
|
See the LICENSE file for copyright details.
|
||
|
|
-->
|
||
|
|
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
|
||
|
|
<title>Togl C API</title>
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body>
|
||
|
|
<script type="text/javascript" src="header.js"></script>
|
||
|
|
<script type="text/javascript">
|
||
|
|
NavigationBar();
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<h1 align="center">Togl C API</h1>
|
||
|
|
|
||
|
|
<h2>Contents</h2>
|
||
|
|
<ul>
|
||
|
|
<li><a href="#compile">Compiling and linking C Togl Functions</a>
|
||
|
|
<li><a href="#setup">Setup and Initialization Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_Init</code>,
|
||
|
|
<code>Togl_InitStubs</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#drawing">Drawing-related Commands</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_PostRedisplay</code>,
|
||
|
|
<code>Togl_SwapBuffers</code>,
|
||
|
|
<code>Togl_MakeCurrent</code>,
|
||
|
|
<code>Togl_SwapInterval</code>
|
||
|
|
<code>Togl_CopyContext</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#query">Query Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_Ident</code>,
|
||
|
|
<code>Togl_Width</code>,
|
||
|
|
<code>Togl_Height</code>,
|
||
|
|
<code>Togl_Interp</code>,
|
||
|
|
<code>Togl_TkWin</code>,
|
||
|
|
<code>Togl_GetProcAddr</code>,
|
||
|
|
<code>Togl_ContextTag</code>
|
||
|
|
<code>Togl_UpdatePending</code>
|
||
|
|
<code>Togl_HasRGBA</code>
|
||
|
|
<code>Togl_IsDoubleBuffered</code>
|
||
|
|
<code>Togl_HasDepthBuffer</code>
|
||
|
|
<code>Togl_HasAccumulationBuffer</code>
|
||
|
|
<code>Togl_HasDestinationAlpha</code>
|
||
|
|
<code>Togl_HasStencilBuffer</code>
|
||
|
|
<code>Togl_StereoMode</code>
|
||
|
|
<code>Togl_HasMultisample</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#index">Color Index Mode Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_AllocColor</code>,
|
||
|
|
<code>Togl_FreeColor</code>,
|
||
|
|
<code>Togl_SetColor</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#font">Font Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_LoadBitmapFont</code>,
|
||
|
|
<code>Togl_UnloadBitmapFont</code>,
|
||
|
|
<code>Togl_WriteObj</code>,
|
||
|
|
<code>Togl_WriteChars</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#client">Client Data Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_SetClientData</code>,
|
||
|
|
<code>Togl_GetClientData</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#overlay">Overlay Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_UseLayer</code>,
|
||
|
|
<code>Togl_ShowOverlay</code>,
|
||
|
|
<code>Togl_HideOverlay</code>,
|
||
|
|
<code>Togl_PostOveralyRedisplay</code>,
|
||
|
|
<code>Togl_ExistsOverlay</code>,
|
||
|
|
<code>Togl_GetOverlayTransparentValue</code>,
|
||
|
|
<code>Togl_IsMappedOverlay</code>,
|
||
|
|
<code>Togl_AllocColorOverlay</code>,
|
||
|
|
<code>Togl_FreeColorOverlay</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#stereo">Stereo Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_Drawbuffer</code>,
|
||
|
|
<li><code>Togl_Clear</code>
|
||
|
|
<li><code>Togl_Frustum</code>
|
||
|
|
<li><code>Togl_Ortho</code>
|
||
|
|
<li><code>Togl_NumEyes</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#image">Image Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_TakePhoto</code>
|
||
|
|
</ul>
|
||
|
|
<li><a href="#convert">Conversion Functions</a>
|
||
|
|
<ul>
|
||
|
|
<li><code>Togl_GetToglFromObj</code>,
|
||
|
|
<li><code>Togl_GetToglFromName</code>
|
||
|
|
</ul>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
|
||
|
|
<h2><a name="compile">Compiling and linking C Togl Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
All Togl functions are found in the Togl header file.
|
||
|
|
|
||
|
|
<blockquote>
|
||
|
|
<code>
|
||
|
|
#include "togl.h"
|
||
|
|
</code>
|
||
|
|
</blockquote>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
For portability, you should include the <code>togl.h</code> header
|
||
|
|
before any other OpenGL headers
|
||
|
|
so it will compile on Microsoft Windows.
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Before calling any Togl functions, you need to initialize it.
|
||
|
|
Regardless if you're using stubs (by defining <code>USE_TOGL_STUBS</code>)
|
||
|
|
or not, the following code will properly initialize togl:
|
||
|
|
|
||
|
|
<blockquote><pre>
|
||
|
|
if (Tcl_InitStubs(interp, "8.1", 0) == NULL
|
||
|
|
|| Togl_InitStubs(interp, "2.0", 0) == NULL) {
|
||
|
|
/* fail */
|
||
|
|
}
|
||
|
|
</pre></blockquote>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
If you are using a prebuilt binary distribution,
|
||
|
|
you should be sure to define <code>USE_TOGL_STUBS</code> beforehand.
|
||
|
|
|
||
|
|
<p>
|
||
|
|
See the source for the demo programs in the Togl source distribution
|
||
|
|
for working examples.
|
||
|
|
|
||
|
|
<h3>Linking</h3>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
If you are using a prebuilt binary,
|
||
|
|
be sure to link against the stub library.
|
||
|
|
On Microsoft Windows,
|
||
|
|
link against <code>Toglstub21.lib opengl32.lib user32.lib gdi32.lib</code>,
|
||
|
|
on Mac OS X,
|
||
|
|
link against <code>-lToglstub2.1 -framework OpenGL</code>,
|
||
|
|
on other platforms,
|
||
|
|
link against <code>-lToglstub2.1 -lGLU -lGL -lm</code>.
|
||
|
|
|
||
|
|
<p>
|
||
|
|
If building your own Togl package,
|
||
|
|
you can use the stubs interface or link in the Tcl and Tk libraries as well.
|
||
|
|
If using the stubs interface, link as shown above.
|
||
|
|
Otherwise:
|
||
|
|
on Microsoft Windows,
|
||
|
|
link against <code>Togl21.lib tk84.lib tcl84.lib opengl32.lib user32.lib gdi32.lib</code>,
|
||
|
|
on Mac OS X,
|
||
|
|
link against <code>-lTogl2.1 -framework Tk -framework Tcl -framework OpenGL</code>,
|
||
|
|
on other platforms,
|
||
|
|
link against <code>-lTogl2.1 -ltk8.4 -ltcl8.4 -lGLU -lGL -lm</code>.
|
||
|
|
|
||
|
|
<h2><a name="setup">Setup and Initialization Functions</a></h2>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_Init(Tcl_Interp *interp)</code>
|
||
|
|
<dd>
|
||
|
|
Initializes the Togl module. This is typically called from the
|
||
|
|
Tk_Main() function
|
||
|
|
or other Tcl package initialization function that is directly linked
|
||
|
|
to the Togl (shared) library.
|
||
|
|
It is also indirectly called via
|
||
|
|
Tcl's <code>package require Togl</code> command.
|
||
|
|
If successful, the return value is TCL_OK.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt>
|
||
|
|
<code>const char *Togl_InitStubs(Tcl_Interp *interp, const char *version, int exact)</code>
|
||
|
|
<dd>
|
||
|
|
Loads the Togl package into the given <code>interp</code>reter
|
||
|
|
and initializes it.
|
||
|
|
<code>version</code> should be <code>"2.0"</code> or higher.
|
||
|
|
This is typically called from C/C++ code that accesses Togl's C API
|
||
|
|
and has installed Togl into the standard TCL hierarchy.
|
||
|
|
See the Tcl InitStubs(3) or the Tk TkInitStubs(3) manual pages for
|
||
|
|
more information.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h2><a name="drawing">Drawing-related Commands</a></h2>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_PostRedisplay(Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Signals that the widget should be redrawn. When Tk is next idle,
|
||
|
|
the <code>displaycommand</code> callback will be invoked.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_SwapBuffers(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Swaps the front and back color buffers for a double-buffered widget.
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glFlush.xml">
|
||
|
|
glFlush</a> is executed if the window is single-buffered. So this call
|
||
|
|
works for both single- and double-buffered contexts. This is
|
||
|
|
typically called in the <code>displaycommand</code> callback function.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_MakeCurrent(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Sets the current rendering context to the given widget. This is done
|
||
|
|
automatically before any Togl callback functions is called. So the
|
||
|
|
call is only needed if you have multiple widgets with separate OpenGL
|
||
|
|
contexts. If the argument is NULL, then the rendering context is cleared
|
||
|
|
and subsequent OpenGL commands will fail.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_SwapInterval(const Togl *togl, int interval)</code>
|
||
|
|
<dd>
|
||
|
|
Returns True if successful.
|
||
|
|
Attempts to change the maximum refresh rate
|
||
|
|
by setting the minimum number of cycles between successive swap buffers.
|
||
|
|
For benchmarking purposes, you should set the swap interval to 0.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_CopyContext(const Togl *from, const Togl *to, unsigned int mask)</code>
|
||
|
|
<dd>
|
||
|
|
Copy a subset of the OpenGL context state from from one context
|
||
|
|
to another using the mask parameter who values are the same as
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glPushAttrib.xml">
|
||
|
|
glPushAttrib</a>.
|
||
|
|
The return value is TCL_OK if the context was copied.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h2><a name="query">Query Functions</a></h2>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>char *Togl_Ident(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Returns a pointer to the identification string associated with a Togl
|
||
|
|
widget or NULL if there's no identifier string.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_Width(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Returns the width of the given Togl widget. Typically called in the
|
||
|
|
<code>reshapecommand</code> callback function.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_Height(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Returns the height of the given Togl widget. Typically called in the
|
||
|
|
<code>reshapecommand</code> callback function.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Tcl_Interp *Togl_Interp(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Returns the Tcl interpreter associated with the given Togl widget.
|
||
|
|
</dl>
|
||
|
|
<dl>
|
||
|
|
<dt>
|
||
|
|
<code>Tk_Window Togl_TkWin(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Returns the Tk window associated with the given Togl widget.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Togl_FuncPtr Togl_GetProcAddr(const char *funcname)</code>
|
||
|
|
<dd>
|
||
|
|
Platform-independent way to get OpenGL function pointers from a
|
||
|
|
function name.
|
||
|
|
Note that in Microsoft Windows (WGL) versions that
|
||
|
|
"the extension function addresses are unique for each pixel format.
|
||
|
|
All rendering contexts of a given pixel format
|
||
|
|
share the same extension function addresses."
|
||
|
|
And on *nix (GLX/X11) platforms,
|
||
|
|
"the function pointers returned are context independent"
|
||
|
|
(Linux ABI documentation).
|
||
|
|
The Mac OS X (AGL) platform acts like a *nix platform.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_ContextTag(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Returns an integer that represents the context tag.
|
||
|
|
All Togl widgets with the same context tag share display lists.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_UpdatePending(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Returns True if the window should be redrawn. See Togl_PostRedisplay.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasRGBA(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget has a RBGA color buffer.
|
||
|
|
False means that the widget is using a color index buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_IsDoubleBuffered(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget is double buffered.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasDepthBuffer(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget is has a depth buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasAccumulationBuffer(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget has an accumulation buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasDestinationAlpha(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget has a destination alpha buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasStencilBuffer(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget has a stencil buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_StereoMode(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return current stereo mode. See ??
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Bool Togl_HasMultisample(const Togl *t)</code>
|
||
|
|
<dd>
|
||
|
|
Return True if Togl widget has a multisample buffer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h2><a name="index">Color Index Mode Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
These functions are only used for color index mode.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>unsigned long Togl_AllocColor(Togl *togl, float red, float green, float blue)</code>
|
||
|
|
<dd>
|
||
|
|
Allocate a color from a read-only colormap. Given a color specified
|
||
|
|
by red, green, and blue return a colormap index (aka pixel value)
|
||
|
|
whose entry most closely matches the red, green, blue color. Red,
|
||
|
|
green, and blue are values in [0,1]. This function is only used in
|
||
|
|
color index mode when the <code>-privatecmap</code> option is false.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_FreeColor(Togl *togl, unsigned long index)</code>
|
||
|
|
<dd>
|
||
|
|
Free a color in a read-only colormap. Index is a value which was
|
||
|
|
returned by the Togl_AllocColor() function. This function is only
|
||
|
|
used in color index mode when the <code>-privatecmap</code> option
|
||
|
|
is false.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_SetColor(Togl *togl,
|
||
|
|
int index, float red, float green, float blue)</code>
|
||
|
|
<dd>
|
||
|
|
Load the colormap entry specified by index with the given red, green
|
||
|
|
and blue values. Red, green, and blue are values in [0,1]. This
|
||
|
|
function is only used in color index mode when the
|
||
|
|
<code>-privatecmap</code> option is true.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
|
||
|
|
<h2><a name="font">Font Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
These functions provide an interface to the simple bitmap font capabilities
|
||
|
|
that every OpenGL implementation provides.
|
||
|
|
Better font support is found in other C APIs, <i>e.g.</i>,
|
||
|
|
<a href="http://quesoglc.sourceforge.net/">QuesoGLC</a>
|
||
|
|
or <a href="http://sourceforge.net/projects/ftgl">FTGL</a>.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>Tcl_Obj *Togl_LoadBitmapFont(Togl *togl,
|
||
|
|
const char *fontname)</code>
|
||
|
|
<dd>
|
||
|
|
Load the named font as a set of
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glBitmap.xml">
|
||
|
|
glBitmap</a> display lists.
|
||
|
|
<var>fontname</var> may be any of the font description styles
|
||
|
|
accepted by the Tk font command.
|
||
|
|
For maximum portability, one of the standard Tk fonts,
|
||
|
|
<b>Courier</b>, <b>Times</b>, and <b>Helvetica</b>, should be used.
|
||
|
|
Unicode fonts are treated as if they have only have an 8-bit index
|
||
|
|
(so poorly).
|
||
|
|
If successful, a Togl BitmapFont object is returned.
|
||
|
|
NULL is returned on failure.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_UnloadBitmapFont(Togl *togl, Tcl_Obj *toglfont)
|
||
|
|
</code>
|
||
|
|
<dd>
|
||
|
|
Destroys the bitmap display lists created by by Togl_LoadBitmapFont().
|
||
|
|
If successful, the return value is TCL_OK.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_WriteChars(const Togl *togl, const Tcl_Obj *toglfont, const char *string, int length)
|
||
|
|
</code>
|
||
|
|
Draw the given <em>string</em>.
|
||
|
|
If the given <em>length</em> is zero, then it is computed using strlen.
|
||
|
|
Returns the length of the drawn string.
|
||
|
|
<dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_WriteObj(const Togl *togl, const Tcl_Obj *toglfont, Tcl_Obj *obj)
|
||
|
|
</code>
|
||
|
|
<dd>
|
||
|
|
Tcl_Obj interface to <code>Tcl_WriteChars</code>.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h2><a name="client">Client Data Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Each Togl structure has a pointer to an arbitrary client data structure.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_SetClientData(Togl *togl, ClientData clientData)</code>
|
||
|
|
<dd>
|
||
|
|
Set the Togl widget's client data pointer to <em>clientData</em>.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>ClientData Togl_GetClientData(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Return the Togl widget's client data pointer.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
|
||
|
|
<h2><a name="overlay">Overlay Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
These functions are modeled after GLUT's overlay sub-API.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_UseLayer(Togl *togl, int layer)</code>
|
||
|
|
<dd>
|
||
|
|
Select the layer into which subsequent OpenGL rendering will be
|
||
|
|
directed. <em>layer</em> may be either <em>TOGL_OVERLAY</em> or
|
||
|
|
<em>TOGL_NORMAL</em>.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_ShowOverlay(Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Display the overlay planes, if any.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_HideOverlay(Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Hide the overlay planes, if any.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_PostOverlayRedisplay(Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
Signal that the overlay planes should be redraw.
|
||
|
|
When Tk is next idle,
|
||
|
|
the <code>overlaydisplaycommand</code> callback will be invoked.
|
||
|
|
</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>
|
||
|
|
|
||
|
|
<h2><a name="stereo">Stereo Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Togl abstracts part of the stereo drawing process to seamlessly
|
||
|
|
support quad-buffered stereo as well as various alternative stereo
|
||
|
|
formats. The stereo viewing parameters, <code>eyeseparation</code>
|
||
|
|
and <code>convergence</code> need to be set with the Togl's
|
||
|
|
<a href="tclapi.html#stereo options">stereo options</a>.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_DrawBuffer(Togl *togl, GLenum mode)</code>
|
||
|
|
<dd>
|
||
|
|
Switch to OpenGL draw buffer.
|
||
|
|
Should be one of GL_BACK_LEFT, GL_BACK_RIGHT, GL_FRONT_LEFT, or
|
||
|
|
GL_FRONT_RIGHT.
|
||
|
|
It is not possible to draw in the left and right buffers at the same
|
||
|
|
time in the alternate stereo modes.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_Clear(const Togl *togl, GLbitfield mask)</code>
|
||
|
|
<dd>
|
||
|
|
Replacement for OpenGL's
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glClear.xml">
|
||
|
|
glClear</a> that takes into account the alternate stereo mode.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_Frustum(const Togl *togl, GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat near, GLfloat far)</code>
|
||
|
|
<dd>
|
||
|
|
Replacement for OpenGL's
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glFrustum.xml">
|
||
|
|
glFrustum</a> that takes into account the alternate stereo mode.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>void Togl_Ortho(const Togl *togl, GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat near, GLfloat far)</code>
|
||
|
|
<dd>
|
||
|
|
Replacement for OpenGL's
|
||
|
|
<a href="http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml">
|
||
|
|
glOrtho</a> that takes into account the alternate stereo mode.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_NumEyes(const Togl *togl)</code>
|
||
|
|
<dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h3>Stereo Example</h3>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
This code works for quad-buffered stereo,
|
||
|
|
as well as the other stereo modes.
|
||
|
|
|
||
|
|
<blockquote><pre>
|
||
|
|
if (Togl_NumEyes(togl) == 1) {
|
||
|
|
Togl_DrawBuffer(togl, GL_BACK);
|
||
|
|
Togl_Clear(togl);
|
||
|
|
glMatrixMode(GL_PROJECTION);
|
||
|
|
glLoadIdentity();
|
||
|
|
Togl_Frustum(togl, left, right, bottom, top, near, far);
|
||
|
|
glMatrixMode(GL_MODELVIEW);
|
||
|
|
<b><i>draw image</i></b>
|
||
|
|
} else {
|
||
|
|
Togl_DrawBuffer(togl, GL_BACK_LEFT);
|
||
|
|
Togl_Clear(togl);
|
||
|
|
glMatrixMode(GL_PROJECTION);
|
||
|
|
glLoadIdentity();
|
||
|
|
Togl_Frustum(togl, left, right, bottom, top, near, far);
|
||
|
|
glMatrixMode(GL_MODELVIEW);
|
||
|
|
<b><i>draw left-eye image</i></b>
|
||
|
|
Togl_DrawBuffer(togl, GL_BACK_RIGHT);
|
||
|
|
Togl_Clear(togl);
|
||
|
|
glMatrixMode(GL_PROJECTION);
|
||
|
|
glLoadIdentity();
|
||
|
|
Togl_Frustum(togl, left, right, bottom, top, near, far);
|
||
|
|
glMatrixMode(GL_MODELVIEW);
|
||
|
|
<b><i>draw right-eye image</i></b>
|
||
|
|
}
|
||
|
|
Togl_SwapBuffers(togl);
|
||
|
|
</pre></blockquote>
|
||
|
|
|
||
|
|
<h2><a name="image">Image Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
<!--description-->
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_TakePhoto(Togl *togl, Tk_PhotoHandle photo)</code>
|
||
|
|
<dd>
|
||
|
|
Take a photo image of the current Togl window and place it in the
|
||
|
|
given <code>photo</code> object.
|
||
|
|
If the window is partially obscured,
|
||
|
|
either by other windows or by the edges of the display,
|
||
|
|
the results are undefined in the obscured region.
|
||
|
|
If successful, the return value is TCL_OK.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<h2><a name="convert">Conversion Functions</a></h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
These functions aid the programmer when writing Togl callback functions.
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_GetToglFromObj(Tcl_Interp *interp, Tcl_Obj *obj, Togl **toglPtr)</code>
|
||
|
|
<dd>
|
||
|
|
Attempt to return a Togl structure "toglPtr" from the Tcl object "obj".
|
||
|
|
If successful, the return value is TCL_OK.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>int Togl_GetToglFromName(Tcl_Interp *interp, const char *cmdName, Togl **toglPtr)</code>
|
||
|
|
<dd>
|
||
|
|
Attempt to return a Togl structure "toglPtr" from the Tcl command name "cmdName".
|
||
|
|
If successful, the return value is TCL_OK.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<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>
|