<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>Application Issues</title> <link rel="stylesheet" type="text/css" href="mesa.css"> </head> <body> <div class="header"> <h1>The Mesa 3D Graphics Library</h1> </div> <iframe src="contents.html"></iframe> <div class="content"> <h1>Application Issues</h1> <p> This page documents known issues with some OpenGL applications. </p> <h2>Topogun</h2> <p> <a href="http://www.topogun.com/">Topogun</a> for Linux (version 2, at least) creates a GLX visual without requesting a depth buffer. This causes bad rendering if the OpenGL driver happens to choose a visual without a depth buffer. </p> <p> Mesa 9.1.2 and later (will) support a DRI configuration option to work around this issue. Using the <a href="http://dri.freedesktop.org/wiki/DriConf">driconf</a> tool, set the "Create all visuals with a depth buffer" option before running Topogun. Then, all GLX visuals will be created with a depth buffer. </p> <h2>Old OpenGL games</h2> <p> Some old OpenGL games (approx. ten years or older) may crash during start-up because of an extension string buffer-overflow problem. </p> <p> The problem is a modern OpenGL driver will return a very long string for the glGetString(GL_EXTENSIONS) query and if the application naively copies the string into a fixed-size buffer it can overflow the buffer and crash the application. </p> <p> The work-around is to set the MESA_EXTENSION_MAX_YEAR environment variable to the approximate release year of the game. This will cause the glGetString(GL_EXTENSIONS) query to only report extensions older than the given year. </p> <p> For example, if the game was released in 2001, do <pre> export MESA_EXTENSION_MAX_YEAR=2001 </pre> before running the game. </p> <h2>Viewperf</h2> <p> See the <a href="viewperf.html">Viewperf issues</a> page for a detailed list of Viewperf issues. </p> </div> </body> </html>