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iOS: Share default-FBO for windows between contexts in a share-group

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The current implementation of QOpenGLContext sharing assumes that the
contexts form a tree and that leaf-nodes are destroyed before their
parents.

We build on this assumption and keep track of the default FBOs for
windows in the root context of the tree. This allows two shared
contexts to both makeCurrent() on the same window surface without
resulting in two FBOs being set up (which doesn't work on iOS due
to the CEAGLLayer already being tied to another render-buffer).

Change-Id: Ib9f8c597effe488480fe99e10846be22c257f490
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
This commit is contained in:
Tor Arne Vestbø 2014-03-27 16:41:56 +01:00 committed by The Qt Project
parent 38b66bdcde
commit e432787ad0
1 changed files with 9 additions and 4 deletions
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13
src/plugins/platforms/ios/qioscontext.mm
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@ -140,17 +140,22 @@ void QIOSContext::swapBuffers(QPlatformSurface *surface)
if (surface->surface()->surfaceClass() == QSurface::Offscreen)
return; // Nothing to do
Q_ASSERT(surface->surface()->surfaceClass() == QSurface::Window);
QIOSWindow *window = static_cast<QIOSWindow *>(surface);
Q_ASSERT(m_framebufferObjects.contains(window));
FramebufferObject &framebufferObject = backingFramebufferObjectFor(surface);
[EAGLContext setCurrentContext:m_eaglContext];
glBindRenderbuffer(GL_RENDERBUFFER, m_framebufferObjects[window].colorRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, framebufferObject.colorRenderbuffer);
[m_eaglContext presentRenderbuffer:GL_RENDERBUFFER];
}
QIOSContext::FramebufferObject &QIOSContext::backingFramebufferObjectFor(QPlatformSurface *surface) const
{
// We keep track of default-FBOs in the root context of a share-group. This assumes
// that the contexts form a tree, where leaf nodes are always destroyed before their
// parents. If that assumption (based on the current implementation) doesn't hold we
// should probably use QOpenGLMultiGroupSharedResource to track the shared default-FBOs.
if (m_sharedContext)
return m_sharedContext->backingFramebufferObjectFor(surface);
Q_ASSERT(surface && surface->surface()->surfaceClass() == QSurface::Window);
QIOSWindow *window = static_cast<QIOSWindow *>(surface);