1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html lang="en"> 3<head> 4 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 5 <title>Debugging Tips</title> 6 <link rel="stylesheet" type="text/css" href="mesa.css"> 7</head> 8<body> 9 10<div class="header"> 11 <h1>The Mesa 3D Graphics Library</h1> 12</div> 13 14<iframe src="contents.html"></iframe> 15<div class="content"> 16 17<h1>Debugging Tips</h1> 18 19<p> 20 Normally Mesa (and OpenGL) records but does not notify the user of 21 errors. It is up to the application to call 22 <code>glGetError</code> to check for errors. Mesa supports an 23 environment variable, MESA_DEBUG, to help with debugging. If 24 MESA_DEBUG is defined, a message will be printed to stdout whenever 25 an error occurs. 26</p> 27 28<p> 29 More extensive error checking is done when Mesa is compiled with the 30 DEBUG symbol defined. You'll have to edit the Make-config file and 31 add -DDEBUG to the CFLAGS line for your system configuration. You may 32 also want to replace any optimization flags with the -g flag so you can 33 use your debugger. After you've edited Make-config type 'make clean' 34 before recompiling. 35</p> 36<p> 37 In your debugger you can set a breakpoint in _mesa_error() to trap Mesa 38 errors. 39</p> 40<p> 41 There is a display list printing/debugging facility. See the end of 42 src/dlist.c for details. 43</p> 44 45</div> 46</body> 47</html> 48