bugle-showerror — reports errors in OpenGL calls
filterset showerror
This filter-set is a light-weight method of detecting OpenGL errors in applications, where gldb-gui(1) is not useable for some reason (for example, when debugging a full-screen application). It writes OpenGL errors to the log (see bugle-log(7) for details of the log). With the default log settings, the error will be reported to standard error.