# The Mesa 3D Graphics Library

# Debugging Tips

Normally Mesa (and OpenGL) records but does not notify the user of errors. It is up to the application to call `glGetError` 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.

More extensive error checking is done in DEBUG builds (`--buildtype debug` for meson, `build=debug` for scons).

In your debugger you can set a breakpoint in _mesa_error() to trap Mesa errors.

There is a display list printing/debugging facility. See the end of src/dlist.c for details.