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glGetError

The glGetError function returns error information.

GLenum glGetError( void );

Parameters

This function has no parameters.

Remarks

The glGetError function 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 OpenGL 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. If all error flags are to be reset, you should always call glGetError in a loop until it returns GL_NO_ERROR.

Initially, all error flags are set to GL_NO_ERROR.

The following are the currently defined errors.

Error Meaning
GL_NO_ERROR No error has been recorded. The value of this symbolic constant is guaranteed to be zero.
GL_INVALID_ENUM An unacceptable value is specified for an enumerated argument. The offending function is ignored, having no side effect other than to set the error flag.
GL_INVALID_VALUE A numeric argument is out of range. The offending function is ignored, having no side effect other than to set the error flag.
GL_INVALID_OPERATION The specified operation is not allowed in the current state. The offending function is ignored, having no side effect other than to set the error flag.
GL_STACK_OVERFLOW This function would cause a stack overflow. The offending function is ignored, having no side effect other than to set the error flag.
GL_STACK_UNDERFLOW This function would cause a stack underflow. The offending function is ignored, having no side effect other than to set the error flag.
GL_OUT_OF_MEMORY There is not enough memory left to execute the function. The state of OpenGL is undefined, except for the state of the error flags, after this error is recorded.

When an error flag is set, results of an OpenGL operation are undefined only if GL_OUT_OF_MEMORY has occurred. In all other cases, the function generating the error is ignored and has no effect on the OpenGL state or framebuffer contents.

Error Codes

The following is the error code generated and its condition.

Error code Condition
GL_INVALID_OPERATION glGetError was called between a call to glBegin and the corresponding call to glEnd.

Requirements

  Windows NT/2000: Requires Windows NT 3.5 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in Gl.h.
  Library: Use Opengl32.lib.

See Also

glBegin, glEnd


  

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