<!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>Debugging Tips</title> <link rel="stylesheet" type="text/css" href="mesa.css"> </head> <body> <h1>Debugging Tips</h1> <p> Normally Mesa (and OpenGL) records but does not notify the user of errors. It is up to the application to call <code>glGetError</code> to check for errors. Mesa supports an environment variable, MESA_DEBUG, to help with debugging. If MESA_DEBUG is defined, a message will be printed to stdout whenever an error occurs. </p> <p> More extensive error checking is done when Mesa is compiled with the DEBUG symbol defined. You'll have to edit the Make-config file and add -DDEBUG to the CFLAGS line for your system configuration. You may also want to replace any optimization flags with the -g flag so you can use your debugger. After you've edited Make-config type 'make clean' before recompiling. </p> <p> In your debugger you can set a breakpoint in _mesa_error() to trap Mesa errors. </p> <p> There is a display list printing/debugging facility. See the end of src/dlist.c for details. </p> </body> </html>