ios: Add support for QOpenGLWidget and QQuickWidget

The global shared context is now always enabled on iOS. This means that
contexts used by QOpenGLWindow/Widget and QQuickWindow/Widget and the
iOS backingstore will share with each other.

[ChangeLog][QtGui] QOpenGLWidget and QQuickWidget are now supported on iOS.

Task-number: QTBUG-40034
Change-Id: Ibfb99ffcb18f8f8d263662fbf237bc348fc730ee
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/qiosintegration.mm b/src/plugins/platforms/ios/qiosintegration.mm
index 7cd4280f5e..837d0e9143 100644
--- a/src/plugins/platforms/ios/qiosintegration.mm
+++ b/src/plugins/platforms/ios/qiosintegration.mm
@@ -77,6 +77,15 @@ QIOSIntegration::QIOSIntegration()
                "'applicationDidFinishLaunching' inside your UIApplication delegate.\n");
     }
 
+    // The backingstore needs a global share context in order to support composition in
+    // QPlatformBackingStore.
+    qApp->setAttribute(Qt::AA_ShareOpenGLContexts, true);
+    // And that context must match the format used for the backingstore's context.
+    QSurfaceFormat fmt;
+    fmt.setDepthBufferSize(16);
+    fmt.setStencilBufferSize(8);
+    QSurfaceFormat::setDefaultFormat(fmt);
+
     // Set current directory to app bundle folder
     QDir::setCurrent(QString::fromUtf8([[[NSBundle mainBundle] bundlePath] UTF8String]));
 
@@ -137,6 +146,8 @@ bool QIOSIntegration::hasCapability(Capability cap) const
         return false;
     case ApplicationState:
         return true;
+    case RasterGLSurface:
+        return true;
     default:
         return QPlatformIntegration::hasCapability(cap);
     }