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GLGETERROR(3G)                                   OpenGL 3.3                                   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_INVALID_FRAMEBUFFER_OPERATION
           The framebuffer object is not complete. 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.

       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.

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software
       B License. For details, see http://oss.sgi.com/projects/FreeB/.



OpenGL 3.3                                       03/08/2011                                   GLGETERROR(3G)