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
