100 lines
3.5 KiB
HTML
100 lines
3.5 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content=
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"HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=us-ascii">
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<title>Chapter 19. Configuring Flipping and UBB</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
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<link rel="start" href="index.html" title=
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"NVIDIA Accelerated Linux Graphics Driver README and Installation Guide">
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<link rel="up" href="installationandconfiguration.html" title=
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"Part I. Installation and Configuration Instructions">
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<link rel="prev" href="programmingmodes.html" title=
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"Chapter 18. Programming Modes">
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<link rel="next" href="procinterface.html" title=
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"Chapter 20. Using the /proc File System Interface">
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</head>
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<body>
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<div class="navheader">
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Chapter 19. Configuring
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Flipping and UBB</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href=
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"programmingmodes.html">Prev</a> </td>
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<th width="60%" align="center">Part I. Installation and
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Configuration Instructions</th>
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<td width="20%" align="right"> <a accesskey="n" href=
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"procinterface.html">Next</a></td>
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</tr>
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</table>
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<hr></div>
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<div class="chapter" lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a name="flippingubb" id=
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"flippingubb"></a>Chapter 19. Configuring Flipping and
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UBB</h2>
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</div>
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</div>
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</div>
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<p>The NVIDIA Accelerated Linux Graphics Driver supports Unified
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Back Buffer (UBB) and OpenGL Flipping. These features can provide
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performance gains in certain situations.</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>Unified Back Buffer (UBB): UBB is available only on NVIDIA
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RTX/Quadro GPUs (Quadro NVS GPUs excluded) and is enabled by
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default when there is sufficient video memory available. This can
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be disabled with the <a href="xconfigoptions.html#UBB">UBB</a> X
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config option. When UBB is enabled, all windows share the same
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back, stencil and depth buffers. When there are many windows, the
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back, stencil and depth usage will never exceed the size of that
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used by a full screen window. However, even for a single small
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window, the back, stencil, and depth video memory usage is that of
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a full screen window. In that case video memory may be used less
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efficiently than in the non-UBB case.</p>
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</li>
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<li>
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<p>Flipping: When OpenGL flipping is enabled, OpenGL can perform
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buffer swaps by changing which buffer is scanned out rather than
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copying the back buffer contents to the front buffer; this is
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generally a higher performance mechanism and allows tearless
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swapping during the vertical retrace (when __GL_SYNC_TO_VBLANK is
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set).</p>
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</li>
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</ul>
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</div>
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<p></p>
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</div>
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<div class="navfooter">
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<hr>
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href=
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"programmingmodes.html">Prev</a> </td>
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<td width="20%" align="center"><a accesskey="u" href=
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"installationandconfiguration.html">Up</a></td>
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<td width="40%" align="right"> <a accesskey="n" href=
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"procinterface.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">
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Chapter 18. Programming Modes </td>
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<td width="20%" align="center"><a accesskey="h" href=
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"index.html">Home</a></td>
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<td width="40%" align="right" valign="top">
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Chapter 20. Using the <code class=
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"computeroutput">/proc</code> File System Interface</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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