On 06/05/14 10:55, Gunnar Sletta wrote: > to be "false" meaning that when an application is not on screen, its graphics > memory and OpenGL context will be deleted.
What does on screen mean? Since.... > affected. - Covers are unaffected. .... my cover shows the GL context - so I'm not sure quite how this will work :) > Only applications using Qt Quick, QSG-classes and/or QOpenGLContext and/or > raw OpenGL calls ARE affected. If this applies to you, there are two ways to > deal with graphics stuff being released: > > 1. Don't allow releasing. > > main.cpp AFTER you told it to load the QML file and BEFORE you show it. > > QQuickWindow::setPersistentSceneGraph(true); > QQuickWindow::setPersistentOpenGL(true); > > This will revert to the current behaviour where graphics resources are > retained, even when the application is backgrounded. One concern is that putting these in the wrong place will of course not be a problem until the switch and then at that point the app will break. Hopefully we'll have the public update-RC programme in place by then so app developers can do QA :) > 2. React and handle it. > > Use the QQuickWindow::sceneGraphInvalidated() and > QOpenGLContext::aboutToBeDestroyed() signals to clean up your graphics > resources and let your application handle not being shown on screen. I assume this is not testable for Harbour apps until 5.2 is actually released? > --- > > I can't tell you when the change over happens, but we're aiming for some time > later this year :) I'm giving you an early heads up so you can update your > applications now if you are affected. Reacting to > http://qt-project.org/doc/qt-5/qquickwindow.html#sceneGraphInvalidated or > http://qt-project.org/doc/qt-5/qopenglcontext.html#aboutToBeDestroyed is > something something you can already do. Same if you want to avoid the issue > all together and setPersistent(SceneGraph|OpenGL)(true) right away. These > APIs have been there since Qt 5.0. ah - thanks. I wasn't sure when individual methods appeared :) David _______________________________________________ SailfishOS.org Devel mailing list
