glGetError man page on DigitalUNIX

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glGetError(3G)							glGetError(3G)

NAME
       glGetError - return error information

SYNOPSIS
       GLenum glGetError(
	       void );

DESCRIPTION
       glGetError()  returns  the  value of the error option.  Each detectable
       error is assigned a numeric code	 and  symbolic	name.  When  an	 error
       occurs,	the  error  option is set to the appropriate error code value.
       No other errors are recorded until glGetError() is  called,  the	 error
       code  is returned, and the option 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
       options. If any single error option has recorded an error, the value of
       that  option  is	 returned and that option is reset to GL_NO_ERROR when
       glGetError() is called. If more than one option has recorded an	error,
       glGetError()  returns and clears an arbitrary error option value. Thus,
       glGetError() should always be  called  in  a  loop,  until  it  returns
       GL_NO_ERROR, if all error options are to be reset.

       Initially, all error options are set to GL_NO_ERROR.

       The following errors are currently defined: No error has been recorded.
       The value of this symbolic constant is guaranteed to be	0.   An	 unac‐
       ceptable	 value	is specified for an enumerated argument. The offending
       command is ignored, and has no other side effect than to set the	 error
       option.	 A  numeric argument is out of range. The offending command is
       ignored, and has no other side effect than to  set  the	error  option.
       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  option.   This  command  would  cause a stack overflow. The
       offending command is ignored, and has no other side effect than to  set
       the  error  option.   This  command  would cause a stack underflow. The
       offending command is ignored, and has no other side effect than to  set
       the  error option.  There is not enough memory left to execute the com‐
       mand. The state of the GL is undefined, except for  the	state  of  the
       error  options,	after  this  error  is	recorded.  The specified table
       exceeds the implementation's maximum supported table size.  The offend‐
       ing  command  is	 ignored, and has no other side effect than to set the
       error option.

       When an error option is set, results of a GL  operation	are  undefined
       only  if GL_OUT_OF_MEMORY has occurred. In all other cases, the command
       generating the error is ignored and has no effect on the	 GL  state  or
       frame  buffer  contents.	 If the generating command returns a value, it
       returns 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)
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