1<HTML> 2 3<TITLE>Debugging Tips</TITLE> 4 5<link rel="stylesheet" type="text/css" href="mesa.css"></head> 6 7<BODY> 8 9<H1>Debugging Tips</H1> 10 11<p> 12 Normally Mesa (and OpenGL) records but does not notify the user of 13 errors. It is up to the application to call 14 <code>glGetError</code> to check for errors. Mesa supports an 15 environment variable, MESA_DEBUG, to help with debugging. If 16 MESA_DEBUG is defined, a message will be printed to stdout whenever 17 an error occurs. 18</p> 19 20<p> 21 More extensive error checking is done when Mesa is compiled with the 22 DEBUG symbol defined. You'll have to edit the Make-config file and 23 add -DDEBUG to the CFLAGS line for your system configuration. You may 24 also want to replace any optimization flags with the -g flag so you can 25 use your debugger. After you've edited Make-config type 'make clean' 26 before recompiling. 27</p> 28<p> 29 In your debugger you can set a breakpoint in _mesa_error() to trap Mesa 30 errors. 31</p> 32<p> 33 There is a display list printing/debugging facility. See the end of 34 src/dlist.c for details. 35</p> 36 37</BODY> 38</HTML> 39