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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - Qt OpenGL 3D Graphics</title><style type="text/css"><!--
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<h1 align=center> Qt OpenGL 3D Graphics</h1><br clear="all">
<h2>Introduction</h2>
<p>
OpenGL is a standard API for rendering 3D graphics.
<p>
OpenGL only deals with 3D rendering and provides little or no support
for GUI programming issues. The user interface for an OpenGL
application must be created with another toolkit, such as Motif on the
X platform, Microsoft Foundation Classes (MFC) under Windows - or Qt
on <i>both</i> platforms.
<p>
The Qt OpenGL module makes it easy to use OpenGL in Qt
applications. It provides an OpenGL widget class that can be used
just like any other Qt widget, only that it opens an OpenGL display
buffer where you can use the OpenGL API to render the contents.
<p>
The Qt OpenGL module is implemented as a platform-independent
Qt/C++ wrapper around the platform-dependent GLX and WGL C APIs. The
provided functionality is very similar to Mark Kilgard's GLUT library,
but with much more non-OpenGL-specific GUI functionality: the whole Qt
API.
<p>
<h2>Installation</h2>
<p>
When you install Qt for X11, the configure script will autodetect if
OpenGL headers and libraries are installed on your system, and if so, it
will include the Qt OpenGL module in the Qt library. (If your OpenGL
headers or libraries are placed in a non-standard directory, you may need
to change the SYSCONF_CXXFLAGS_OPENGL and/or SYSCONF_LFLAGS_OPENGL in the
config file for your system).
<p>
When you install Qt for Windows, the Qt OpenGL module is always included.
<p>
The Qt OpenGL module is not licensed for use with the Qt Professional
Edition. Consider upgrading to the Qt Enterprise Edition if you require
OpenGL support.
<p>
Note about using Mesa on X11: Mesa versions earlier than 3.1 would use the
name "MesaGL" and "MesaGLU" for the libraries, instead of "GL" and
"GLU". If you want to use a pre-3.1 version of Mesa, you must change
the Makefiles to use these library names instead. The easiest way to
do this edit the SYSCONF_LIBS_OPENGL line in the config file you are
using, changing "-lGL -lGLU" to "-lMesaGL -lMesaGLU"; then run "configure"
again.
<p>
<h2>The QGL Classes</h2>
<p>
The OpenGL support classes in Qt are:
<ul>
<li> <strong><a href="qglwidget.html">QGLWidget</a>:</strong> An easy-to-use Qt
widget for rendering OpenGL scenes.
<li> <strong><a href="qglcontext.html">QGLContext</a>:</strong> Encapsulates an OpenGL rendering context.
<li> <strong><a href="qglformat.html">QGLFormat</a>:</strong> Specifies the
display format of a rendering context.
</ul>
<p>
Many applications need only the high-level QGLWidget class. The other QGL
classes provide advanced features.
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<td>Copyright 2000 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
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