eglfs: Add support for systems without pbuffer support

Use a small native window and window surface in case the hooks indicate
that pbuffer support is not available.

Change-Id: I6515309041f0e1e2f5321d59941f35d6ee16dca7
Reviewed-by: Louai Al-Khanji <louai.al-khanji@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

3 files changed, 13 insertions, 0 deletions

diff --git a/src/gui/kernel/qopenglcontext.cpp b/src/gui/kernel/qopenglcontext.cpp
index 8b2378788f..51b4a6a079 100644
--- a/src/gui/kernel/qopenglcontext.cpp
+++ b/src/gui/kernel/qopenglcontext.cpp
@@ -606,6 +606,7 @@ bool QOpenGLContext::create()
     d->platformGLContext = QGuiApplicationPrivate::platformIntegration()->createPlatformOpenGLContext(this);
     if (!d->platformGLContext)
         return false;
+    d->platformGLContext->initialize();
     d->platformGLContext->setContext(this);
     if (!d->platformGLContext->isSharing())
         d->shareContext = 0;
diff --git a/src/gui/kernel/qplatformopenglcontext.cpp b/src/gui/kernel/qplatformopenglcontext.cpp
index 527bfdd983..bf0dccd440 100644
--- a/src/gui/kernel/qplatformopenglcontext.cpp
+++ b/src/gui/kernel/qplatformopenglcontext.cpp
@@ -89,6 +89,16 @@ QPlatformOpenGLContext::~QPlatformOpenGLContext()
 }
 
 /*!
+  Called after a new instance is constructed. The default implementation does nothing.
+
+  Subclasses can use this function to perform additional initialization that relies on
+  virtual functions.
+ */
+void QPlatformOpenGLContext::initialize()
+{
+}
+
+/*!
     Reimplement in subclass if your platform uses framebuffer objects for surfaces.
 
     The default implementation returns 0.
diff --git a/src/gui/kernel/qplatformopenglcontext.h b/src/gui/kernel/qplatformopenglcontext.h
index 261b6921a4..0a2bacfbde 100644
--- a/src/gui/kernel/qplatformopenglcontext.h
+++ b/src/gui/kernel/qplatformopenglcontext.h
@@ -63,6 +63,8 @@ public:
     QPlatformOpenGLContext();
     virtual ~QPlatformOpenGLContext();
 
+    virtual void initialize();
+
     virtual QSurfaceFormat format() const = 0;
 
     virtual void swapBuffers(QPlatformSurface *surface) = 0;