glGetError man page on OpenBSD

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GLGETERROR(3G)							GLGETERROR(3G)

NAME
       glGetError - return error information

C SPECIFICATION
       GLenum glGetError( void )

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
				     command is ignored, and has no other side
				     effect 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
				     underflow.	 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 the command.  The state of the GL
				     is undefined, except for the state of the
				     error flags, after this error is
				     recorded.

       GL_TABLE_TOO_LARGE	     The specified table exceeds the
				     implementation's maximum supported table
				     size.  The offending command is ignored,
				     and has no other side effect than to set
				     the error flag.

       When an error flag 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.

								 March 1, 2011
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