DESCRIPTION
       glGetError  returns  the value of the error flag.  Each detectable error
       is assigned a numeric code and symbolic name.  When an error occurs, the
       error  flag is set to the appropriate error code value.  No other errors
       are recorded until glGetError is called, the error code is returned, and
       the  flag  is  reset  to  GL_NO_ERROR.   If a call to glGetError returns
       GL_NO_ERROR, there has been no detectable error since the last  call  to
       glGetError, or since the GL was initialized.

       To  allow  for  distributed  implementations, there may be several error
       flags.  If any single error flag has recorded an  error,  the  value  of
       that  flag  is  returned  and  that  flag  is  reset to GL_NO_ERROR when
       glGetError is called.  If more than one  flag  has  recorded  an  error,
       glGetError  returns  and  clears  an  arbitrary error flag value.  Thus,
       glGetError  should  always  be  called  in  a  loop,  until  it  returns
       GL_NO_ERROR, if all error flags are to be reset.

       Initially, all error flags are set to GL_NO_ERROR.

       The following errors are currently defined:

       GL_NO_ERROR                   No  error has been recorded.  The value of
                                     this symbolic constant is guaranteed to be
                                     0.

       GL_INVALID_ENUM               An  unacceptable value is specified for an
                                     enumerated argument.  The  offending  com‐
                                     mand is ignored, and has no other side ef‐
                                     fect than to set the error flag.

       GL_INVALID_VALUE              A numeric argument is out of  range.   The
                                     offending  command  is ignored, and has no
                                     other side effect than to  set  the  error
                                     flag.

       GL_INVALID_OPERATION          The  specified operation is not allowed in
                                     the current state.  The offending  command
                                     is  ignored,  and has no other side effect
                                     than to set the error flag.

       GL_STACK_OVERFLOW             This command would cause a stack overflow.
                                     The  offending command is ignored, and has
                                     no other side effect than to set the error
                                     flag.

       GL_STACK_UNDERFLOW            This  command  would  cause a stack under‐
                                     flow.  The offending command  is  ignored,
                                     and  has  no other side effect than to set
                                     the error flag.

       GL_OUT_OF_MEMORY              There is not enough memory left to execute
       0.  If glGetError itself generates an error, it returns 0.

NOTES
       GL_TABLE_TOO_LARGE was introduced in GL version 1.2.

ERRORS
       GL_INVALID_OPERATION  is generated if glGetError is executed between the
       execution of glBegin and the corresponding execution of glEnd.  In  this
       case glGetError returns 0.

                                                                 GLGETERROR(3G)