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 <h1>Debugging Tips</h1> 11 12 <p> 13 Normally Mesa (and OpenGL) records but does not notify the user of 14 errors. It is up to the application to call 15 <code>glGetError</code> to check for errors. Mesa supports an 16 environment variable, MESA_DEBUG, to help with debugging. If 17 MESA_DEBUG is defined, a message will be printed to stdout whenever 18 an error occurs. 19 </p> 20 21 <p> 22 More extensive error checking is done when Mesa is compiled with the 23 DEBUG symbol defined. You'll have to edit the Make-config file and 24 add -DDEBUG to the CFLAGS line for your system configuration. You may 25 also want to replace any optimization flags with the -g flag so you can 26 use your debugger. After you've edited Make-config type 'make clean' 27 before recompiling. 28 </p> 29 <p> 30 In your debugger you can set a breakpoint in _mesa_error() to trap Mesa 31 errors. 32 </p> 33 <p> 34 There is a display list printing/debugging facility. See the end of 35 src/dlist.c for details. 36 </p> 37 38 </body> 39 </html> 40
