Returns a bool indicating whether the receiver's OpenGL context
is the current context.
@return true if the receiver holds the current OpenGL context,
false otherwise
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
Returns a bool indicating whether the receiver's OpenGL context is the current context.
@return true if the receiver holds the current OpenGL context, false otherwise @exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul>