Make it possible to have shared contexts to Lighthouse

This adds a getter to QPlatformGLContext for the "default shared
context". The setter is protected as it is the plugins responsibillity
to create it or not. QPlatformWindowFormat has also gotten a pointer to
a QPlatformGLContext for a non default shared context. Only implemented
shared contexts in testlite for now.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/opengl/qgl_qpa.cpp b/src/opengl/qgl_qpa.cpp
index aa124fe138..0fc885c3f5 100644
--- a/src/opengl/qgl_qpa.cpp
+++ b/src/opengl/qgl_qpa.cpp
@@ -66,6 +66,9 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
     }else {
         QWidget *widget = static_cast<QWidget *>(d->paintDevice);
         if (!widget->platformWindow()){
+            QPlatformWindowFormat format = widget->platformWindowFormat();
+            format.setWindowApi(QPlatformWindowFormat::OpenGL);
+            widget->setPlatformWindowFormat(format);
             widget->winId();//make window
         }
         d->platformContext = widget->platformWindow()->glContext();