upstream-doc/man2/xhtml/glXIntro.xml

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   3 <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glXIntro</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glXIntro"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glXIntro — Introduction to OpenGL in the X window system</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="overview"></a><h2>Overview</h2><p>
   4         </p><p>
   5             OpenGL (called GL in other pages) is a high-performance 3D-oriented
   6             renderer.  It is available in the X window system through the GLX extension.
   7             To determine whether the GLX extension is supported by an X server, and if
   8             so, what version is supported, call <a class="citerefentry" href="glXQueryExtension.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtension</span></span></a> and
   9             <a class="citerefentry" href="glXQueryVersion.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryVersion</span></span></a>.
  10         </p><p>
  11             GLX extended X servers make a subset of their visuals available for OpenGL
  12             rendering.  Drawables created with these visual can also be rendered into
  13             using the core X renderer and or any other X extension that is compatible
  14             with all core X visuals.
  15         </p><p>
  16             GLX extends a drawable's standard color buffer with additional buffers.
  17             These buffers include back and auxiliary color buffers, a depth buffer, a
  18             stencil buffer, and a color accumulation buffer.  Some or all of the buffers
  19             listed are included in each X visual that supports OpenGL.
  20         </p><p>
  21             GLX supports rendering into three types of drawables: windows, pixmaps, and
  22             pbuffers (pixel buffers). GLX windows and pixmaps are X resources, and
  23             capable of accepting core X rendering as well as OpenGL rendering.
  24             GLX-pbuffers are GLX only resources and might not accept core X rendering.
  25         </p><p>
  26             To render using OpenGL into a GLX drawable, you must determine the
  27             appropriate GLXFBConfig that supports the rendering features your
  28             application requires. <a class="citerefentry" href="glXChooseFBConfig.xml"><span class="citerefentry"><span class="refentrytitle">glXChooseFBConfig</span></span></a> returns a GLXFBConfig matching
  29             the required attributes or <code class="constant">NULL</code> if no match is found.  A complete
  30             list of GLXFBConfigs supported by a server can be obtained by calling
  31             <a class="citerefentry" href="glXGetFBConfigs.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigs</span></span></a>.  Attributes of a particular GLXFBConfig can be
  32             queried by calling <a class="citerefentry" href="glXGetFBConfigAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigAttrib</span></span></a>.
  33         </p><p>
  34             For GLX windows and pixmaps, a suitable X drawable (using either
  35             <code class="function">XCreateWindow</code> or <code class="function">XCreatePixmap</code>, respectively) with a matching
  36             visual must be created first.  Call <a class="citerefentry" href="glXGetVisualFromFBConfig.xml"><span class="citerefentry"><span class="refentrytitle">glXGetVisualFromFBConfig</span></span></a> to obtain
  37             the necessary XVisualInfo structure for creating the X drawable.  For
  38             pbuffers, no underlying X drawable is required.
  39         </p><p>
  40             To create a GLX window from an X window, call <a class="citerefentry" href="glXCreateWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateWindow</span></span></a>.
  41             Likewise, to create a GLX pixmap, call <a class="citerefentry" href="glXCreatePixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePixmap</span></span></a>. Pbuffers are
  42             created by calling <a class="citerefentry" href="glXCreatePbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePbuffer</span></span></a>.  Use <a class="citerefentry" href="glXDestroyWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyWindow</span></span></a>,
  43             <a class="citerefentry" href="glXDestroyPixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPixmap</span></span></a>, and <a class="citerefentry" href="glXDestroyPbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPbuffer</span></span></a> to release previously
  44             allocated resources.
  45         </p><p>
  46             A GLX context is required to bind OpenGL rendering to a GLX resource.  A GLX
  47             resource and rendering context must have compatible GLXFBConfigs.  To create
  48             a GLX context, call <a class="citerefentry" href="glXCreateNewContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateNewContext</span></span></a>.  A context may be bound to a
  49             GLX drawable by using <a class="citerefentry" href="glXMakeContextCurrent.xml"><span class="citerefentry"><span class="refentrytitle">glXMakeContextCurrent</span></span></a>.  This context/drawable
  50             pair becomes the current context and current drawable, and is used by all
  51             OpenGL rendering commands until <a class="citerefentry" href="glXMakeContextCurrent.xml"><span class="citerefentry"><span class="refentrytitle">glXMakeContextCurrent</span></span></a> is called with
  52             different arguments.
  53         </p><p>
  54             Both core X and OpenGL commands can be used to operate on drawables;
  55             however, the X and OpenGL command streams are not synchronized.
  56             Synchronization can be explicitly specified using by calling <a class="citerefentry" href="glXWaitGL.xml"><span class="citerefentry"><span class="refentrytitle">glXWaitGL</span></span></a>,
  57             <a class="citerefentry" href="glXWaitX.xml"><span class="citerefentry"><span class="refentrytitle">glXWaitX</span></span></a>, <code class="function">XSync</code>, and <code class="function">XFlush</code>.
  58         </p><p>
  59         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="examples"></a><h2>Examples</h2><p>
  60             Below is a minimal example of creating an RGBA-format X window that's
  61             compatible with OpenGL using GLX 1.3 commands.  The window is cleared to
  62             yellow when the program runs.  The program does minimal error checking; all
  63             return values should be checked.
  64         </p><p>
  65             </p><pre class="programlisting">
  66 #include &lt;stdio.h&gt;
  67 #include &lt;stdlib.h&gt;
  68 #include &lt;GL/gl.h&gt;
  69 #include &lt;GL/glx.h&gt;
  70
  71 int singleBufferAttributess[] = {
  72     GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
  73     GLX_RENDER_TYPE,   GLX_RGBA_BIT,
  74     GLX_RED_SIZE,      1,   /* Request a single buffered color buffer */
  75     GLX_GREEN_SIZE,    1,   /* with the maximum number of color bits  */
  76     GLX_BLUE_SIZE,     1,   /* for each component                     */
  77     None
  78 };
  79
  80 int doubleBufferAttributes[] = {
  81     GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
  82     GLX_RENDER_TYPE,   GLX_RGBA_BIT,
  83     GLX_DOUBLEBUFFER,  True,  /* Request a double-buffered color buffer with */
  84     GLX_RED_SIZE,      1,     /* the maximum number of bits per component    */
  85     GLX_GREEN_SIZE,    1,
  86     GLX_BLUE_SIZE,     1,
  87     None
  88 };
  89
  90
  91 static Bool WaitForNotify( Display *dpy, XEvent *event, XPointer arg ) {
  92     return (event-&gt;type == MapNotify) &amp;&amp; (event-&gt;xmap.window == (Window) arg);
  93 }
  94 int main( int argc, char *argv[] )
  95 {
  96     Display              *dpy;
  97     Window                xWin;
  98     XEvent                event;
  99     XVisualInfo          *vInfo;
 100     XSetWindowAttributes  swa;
 101     GLXFBConfig          *fbConfigs;
 102     GLXContext            context;
 103     GLXWindow             glxWin;
 104     int                   swaMask;
 105     int                   numReturned;
 106     int                   swapFlag = True;
 107
 108     /* Open a connection to the X server */
 109     dpy = XOpenDisplay( NULL );
 110     if ( dpy == NULL ) {
 111         printf( "Unable to open a connection to the X server\n" );
 112         exit( EXIT_FAILURE );
 113     }
 114
 115     /* Request a suitable framebuffer configuration - try for a double
 116     ** buffered configuration first */
 117     fbConfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy),
 118                                    doubleBufferAttributes, &amp;numReturned );
 119
 120     if ( fbConfigs == NULL ) {  /* no double buffered configs available */
 121       fbConfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy),
 122                                      singleBufferAttributess, &amp;numReturned );
 123       swapFlag = False;
 124     }
 125
 126     /* Create an X colormap and window with a visual matching the first
 127     ** returned framebuffer config */
 128     vInfo = glXGetVisualFromFBConfig( dpy, fbConfigs[0] );
 129
 130     swa.border_pixel = 0;
 131     swa.event_mask = StructureNotifyMask;
 132     swa.colormap = XCreateColormap( dpy, RootWindow(dpy, vInfo-&gt;screen),
 133                                     vInfo-&gt;visual, AllocNone );
 134
 135     swaMask = CWBorderPixel | CWColormap | CWEventMask;
 136
 137     xWin = XCreateWindow( dpy, RootWindow(dpy, vInfo-&gt;screen), 0, 0, 256, 256,
 138                           0, vInfo-&gt;depth, InputOutput, vInfo-&gt;visual,
 139                           swaMask, &amp;swa );
 140
 141     /* Create a GLX context for OpenGL rendering */
 142     context = glXCreateNewContext( dpy, fbConfigs[0], GLX_RGBA_TYPE,
 143                                  NULL, True );
 144
 145     /* Create a GLX window to associate the frame buffer configuration
 146     ** with the created X window */
 147     glxWin = glXCreateWindow( dpy, fbConfigs[0], xWin, NULL );
 148
 149     /* Map the window to the screen, and wait for it to appear */
 150     XMapWindow( dpy, xWin );
 151     XIfEvent( dpy, &amp;event, WaitForNotify, (XPointer) xWin );
 152
 153     /* Bind the GLX context to the Window */
 154     glXMakeContextCurrent( dpy, glxWin, glxWin, context );
 155
 156     /* OpenGL rendering ... */
 157     glClearColor( 1.0, 1.0, 0.0, 1.0 );
 158     glClear( GL_COLOR_BUFFER_BIT );
 159
 160     glFlush();
 161
 162     if ( swapFlag )
 163         glXSwapBuffers( dpy, glxWin );
 164
 165     sleep( 10 );
 166     exit( EXIT_SUCCESS );
 167 }
 168             </pre><p>
 169         </p><p>
 170         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
 171             An X color map must be created and passed to <code class="function">XCreateWindow</code>.
 172         </p><p>
 173             A GLX context must be created and bound to a GLX drawable before OpenGL
 174             commands can be executed.  OpenGL commands executed while no
 175             context/drawable pair is current result in undefined behavior.
 176         </p><p>
 177             Exposure events indicate that <span class="emphasis"><em>all</em></span> buffers associated with the
 178             specified window may be damaged and should be repainted. Although certain
 179             buffers of some visuals on some systems may never require repainting (the
 180             depth buffer, for example), it is incorrect to write a program assuming that
 181             these buffers will not be damaged.
 182         </p><p>
 183             GLX commands utilize XVisualInfo structures rather than pointers to visuals
 184             or visualIDs directly.  XVisualInfo structures contain <span class="emphasis"><em>visual</em></span>,
 185             <span class="emphasis"><em>visualID</em></span>, <span class="emphasis"><em>screen</em></span>, and <span class="emphasis"><em>depth</em></span> elements, as well as other
 186             X-specific information.
 187         </p><p>
 188         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="usingglxextensions"></a><h2>Using GLX Extensions</h2><p>
 189             All supported GLX extensions will have a corresponding definition in glx.h
 190             and a token in the extension string returned by
 191             <a class="citerefentry" href="glXQueryExtensionsString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtensionsString</span></span></a>.  For example, if the
 192             <code class="code">EXT_visual_info</code> extension is supported, then this token will be
 193             defined in glx.h and <code class="code">EXT_visual_info</code> will appear in the extension
 194             string returned by <a class="citerefentry" href="glXQueryExtensionsString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtensionsString</span></span></a>. The definitions in glx.h
 195             can be used at compile time to determine if procedure calls corresponding to
 196             an extension exist in the library.
 197         </p><p>
 198             OpenGL itself is capable of being extended.
 199         </p><p>
 200         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="glx11glx12andglx13"></a><h2>GLX 1.1, GLX 1.2, and GLX 1.3</h2><p>
 201             GLX 1.3 is now supported and is backward compatible with GLX 1.1 and GLX
 202             1.2.  It introduces new functionality (namely GLXFBConfigs) that supersedes
 203             the GLX 1.2 functionality.  GLX 1.2 commands are supported, but their use in
 204             new application development is not recommended.
 205         </p><p>
 206             GLX 1.3 corresponds to OpenGL versions 1.2 and introduces the following new
 207             calls: <a class="citerefentry" href="glXGetFBConfigs.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigs</span></span></a>, <a class="citerefentry" href="glXGetFBConfigAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigAttrib</span></span></a>,
 208             <a class="citerefentry" href="glXGetVisualFromFBConfig.xml"><span class="citerefentry"><span class="refentrytitle">glXGetVisualFromFBConfig</span></span></a>, <a class="citerefentry" href="glXCreateWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateWindow</span></span></a>, <a class="citerefentry" href="glXDestroyWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyWindow</span></span></a>,
 209             <a class="citerefentry" href="glXCreatePixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePixmap</span></span></a>, <a class="citerefentry" href="glXDestroyPixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPixmap</span></span></a>, <a class="citerefentry" href="glXCreatePbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePbuffer</span></span></a>,
 210             <a class="citerefentry" href="glXDestroyPbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPbuffer</span></span></a>, <a class="citerefentry" href="glXQueryDrawable.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryDrawable</span></span></a>, <a class="citerefentry" href="glXCreateNewContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateNewContext</span></span></a>,
 211             <a class="citerefentry" href="glXMakeContextCurrent.xml"><span class="citerefentry"><span class="refentrytitle">glXMakeContextCurrent</span></span></a>, <a class="citerefentry" href="glXGetCurrentReadDrawable.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentReadDrawable</span></span></a>,
 212             <a class="citerefentry" href="glXGetCurrentDisplay.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentDisplay</span></span></a>, <a class="citerefentry" href="glXQueryContext.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryContext</span></span></a>, and <a class="citerefentry" href="glXSelectEvent.xml"><span class="citerefentry"><span class="refentrytitle">glXSelectEvent</span></span></a>,
 213             <a class="citerefentry" href="glXGetSelectedEvent.xml"><span class="citerefentry"><span class="refentrytitle">glXGetSelectedEvent</span></span></a>.
 214         </p><p>
 215             GLX 1.2 corresponds to OpenGL version 1.1 and introduces the following new
 216             call: <a class="citerefentry" href="glXGetCurrentDisplay.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentDisplay</span></span></a>.
 217         </p><p>
 218             GLX 1.1 corresponds to OpenGL version 1.0 and introduces the following new
 219             calls: <a class="citerefentry" href="glXQueryExtensionsString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtensionsString</span></span></a>, <a class="citerefentry" href="glXQueryServerString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryServerString</span></span></a>, and
 220             <a class="citerefentry" href="glXGetClientString.xml"><span class="citerefentry"><span class="refentrytitle">glXGetClientString</span></span></a>.
 221         </p><p>
 222             Call <a class="citerefentry" href="glXQueryVersion.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryVersion</span></span></a> to determine at runtime what version of GLX is
 223             available. <a class="citerefentry" href="glXQueryVersion.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryVersion</span></span></a> returns the version that is supported on the
 224             connection. Thus, if 1.3 is returned, both the client and server support GLX
 225             1.3.  You can also check the GLX version at compile time: GLX_VERSION_1_1
 226             will be defined in glx.h if GLX 1.1 calls are supported, GLX_VERSION_1_2
 227             will be defined if GLX 1.2 calls are supported, and GLX_VERSION_1_3 will be
 228             defined if GLX 1.3 calls are supported.
 229         </p><p>
 230         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
 231             <a class="citerefentry" href="glFinish.xml"><span class="citerefentry"><span class="refentrytitle">glFinish</span></span></a>,
 232             <a class="citerefentry" href="glFlush.xml"><span class="citerefentry"><span class="refentrytitle">glFlush</span></span></a>,
 233             <a class="citerefentry" href="glXChooseVisual.xml"><span class="citerefentry"><span class="refentrytitle">glXChooseVisual</span></span></a>,
 234             <a class="citerefentry" href="glXCopyContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCopyContext</span></span></a>,
 235             <a class="citerefentry" href="glXCreateContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateContext</span></span></a>,
 236             <a class="citerefentry" href="glXCreateGLXPixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateGLXPixmap</span></span></a>,
 237             <a class="citerefentry" href="glXCreateNewContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateNewContext</span></span></a>,
 238             <a class="citerefentry" href="glXCreatePbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePbuffer</span></span></a>,
 239             <a class="citerefentry" href="glXCreatePixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXCreatePixmap</span></span></a>,
 240             <a class="citerefentry" href="glXCreateWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateWindow</span></span></a>,
 241             <a class="citerefentry" href="glXDestroyContext.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyContext</span></span></a>,
 242             <a class="citerefentry" href="glXDestroyPbuffer.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPbuffer</span></span></a>,
 243             <a class="citerefentry" href="glXDestroyPixmap.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyPixmap</span></span></a>,
 244             <a class="citerefentry" href="glXDestroyWindow.xml"><span class="citerefentry"><span class="refentrytitle">glXDestroyWindow</span></span></a>,
 245             <a class="citerefentry" href="glXGetClientString.xml"><span class="citerefentry"><span class="refentrytitle">glXGetClientString</span></span></a>,
 246             <a class="citerefentry" href="glXGetConfig.xml"><span class="citerefentry"><span class="refentrytitle">glXGetConfig</span></span></a>,
 247             <a class="citerefentry" href="glXGetCurrentDisplay.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentDisplay</span></span></a>,
 248             <a class="citerefentry" href="glXGetCurrentReadDrawable.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentReadDrawable</span></span></a>,
 249             <a class="citerefentry" href="glXGetFBConfigAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigAttrib</span></span></a>,
 250             <a class="citerefentry" href="glXGetFBConfigs.xml"><span class="citerefentry"><span class="refentrytitle">glXGetFBConfigs</span></span></a>,
 251             <a class="citerefentry" href="glXGetProcAddress.xml"><span class="citerefentry"><span class="refentrytitle">glXGetProcAddress</span></span></a>,
 252             <a class="citerefentry" href="glXGetSelectedEvent.xml"><span class="citerefentry"><span class="refentrytitle">glXGetSelectedEvent</span></span></a>,
 253             <a class="citerefentry" href="glXGetVisualFromFBConfig.xml"><span class="citerefentry"><span class="refentrytitle">glXGetVisualFromFBConfig</span></span></a>,
 254             <a class="citerefentry" href="glXIsDirect.xml"><span class="citerefentry"><span class="refentrytitle">glXIsDirect</span></span></a>,
 255             <a class="citerefentry" href="glXMakeContextCurrent.xml"><span class="citerefentry"><span class="refentrytitle">glXMakeContextCurrent</span></span></a>,
 256             <a class="citerefentry" href="glXMakeCurrent.xml"><span class="citerefentry"><span class="refentrytitle">glXMakeCurrent</span></span></a>,
 257             <a class="citerefentry" href="glXQueryContext.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryContext</span></span></a>,
 258             <a class="citerefentry" href="glXQueryDrawable.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryDrawable</span></span></a>,
 259             <a class="citerefentry" href="glXQueryExtension.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtension</span></span></a>,
 260             <a class="citerefentry" href="glXQueryExtensionsString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtensionsString</span></span></a>,
 261             <a class="citerefentry" href="glXQueryServerString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryServerString</span></span></a>,
 262             <a class="citerefentry" href="glXQueryVersion.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryVersion</span></span></a>,
 263             <a class="citerefentry" href="glXSelectEvent.xml"><span class="citerefentry"><span class="refentrytitle">glXSelectEvent</span></span></a>,
 264             <a class="citerefentry" href="glXSwapBuffers.xml"><span class="citerefentry"><span class="refentrytitle">glXSwapBuffers</span></span></a>,
 265             <a class="citerefentry" href="glXUseXFont.xml"><span class="citerefentry"><span class="refentrytitle">glXUseXFont</span></span></a>,
 266             <a class="citerefentry" href="glXWaitGL.xml"><span class="citerefentry"><span class="refentrytitle">glXWaitGL</span></span></a>,
 267             <a class="citerefentry" href="glXWaitX.xml"><span class="citerefentry"><span class="refentrytitle">glXWaitX</span></span></a>.
 268             <code class="function">XCreateColormap</code>,
 269             <code class="function">XCreateWindow</code>,
 270             <code class="function">XSync</code>
 271         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
 272             Copyright <span class="trademark"></span>© 1991-2006
 273             Silicon Graphics, Inc. This document is licensed under the SGI
 274             Free Software B License. For details, see
 275             <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
 276         </p></div></div></body></html>