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Enhance QOffscreenSurface docs wrt the format 

Prevent nasty surprises on some EGL implementations.

Change-Id: I0c6c8a6c631d4dcb979afd81a150491a42aa63f8
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
bb10
Laszlo Agocs 2014-03-25 15:03:51 +01:00 committed by The Qt Project
parent ad1c088a2a
commit 75f9c75f0a
1 changed files with 8 additions and 0 deletions
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8
src/gui/kernel/qoffscreensurface.cpp
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@ -71,6 +71,14 @@ QT_BEGIN_NAMESPACE
How the offscreen surface is implemented depends on the underlying platform, but it will
typically use a pixel buffer (pbuffer). If the platform doesn't implement or support
offscreen surfaces, QOffscreenSurface will use an invisible QWindow internally.
\note In order to create an offscreen surface that is guaranteed to be compatible with
a given context and window, make sure to set the format to the context's or the
window's actual format, that is, the QSurfaceFormat returned from
QOpenGLContext::format() or QWindow::format() \e{after the context or window has been
created}. Passing the format returned from QWindow::requestedFormat() to setFormat()
may result in an incompatible offscreen surface since the underlying windowing system
interface may offer a different set of configurations for window and pbuffer surfaces.
*/
class Q_GUI_EXPORT QOffscreenSurfacePrivate : public QObjectPrivate
{