Add QEGLContext::invalidateContext

QEGLContext::invalidateContext will mark that egl context is invalide
and trigger SceneGraph to destroy it, create a new one and re-create
and re-upload all resources (e.g. textures) associated with the current
state of the SceneGraph

In addition this change also improves
QEglFSWindow::invalidateSurface() and
QEglFSContext::eglSurfaceForPlatformSurface(..)

Where QEglFSWindow::invalidateSurface() will now destroy the
corresponding EGLSurface via eglDestroySurface, including "unbinding"
it from the current thread via eglMakeCurrent and
un-setting the screen's EGLSurface in case it's the same resource.

QEglFSContext::eglSurfaceForPlatformSurface(..) will now call
QEglFSWindow::resetSurface() in case of getting a EGL_NO_SURFACE
from the QEglFSWindow (which happens if above invalidateSurface()
was called before) - therefor re-creating the resource if
it was destoyed via QEglFSWindow::invalidateSurface()

Pick-to: 6.5
Change-Id: I37badd1fc11e993c395fb1502e9bd27ebe18b821
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/gui/opengl/platform/egl/qeglplatformcontext_p.h b/src/gui/opengl/platform/egl/qeglplatformcontext_p.h
index 556fbabee4..b1e9c4b4c2 100644
--- a/src/gui/opengl/platform/egl/qeglplatformcontext_p.h
+++ b/src/gui/opengl/platform/egl/qeglplatformcontext_p.h
@@ -69,12 +69,14 @@ public:
 
     QSurfaceFormat format() const override;
     bool isSharing() const override { return m_shareContext != EGL_NO_CONTEXT; }
-    bool isValid() const override { return m_eglContext != EGL_NO_CONTEXT; }
+    bool isValid() const override { return m_eglContext != EGL_NO_CONTEXT && !m_markedInvalid; }
 
     EGLContext nativeContext() const override { return eglContext(); }
     EGLConfig config() const override { return eglConfig(); }
     EGLDisplay display() const override { return eglDisplay(); }
 
+    virtual void invalidateContext() override { m_markedInvalid = true; }
+
     EGLContext eglContext() const;
     EGLDisplay eglDisplay() const;
     EGLConfig eglConfig() const;
@@ -102,6 +104,8 @@ private:
     Flags m_flags;
     bool m_ownsContext = false;
     QList<EGLint> m_contextAttrs;
+
+    bool m_markedInvalid = false;
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QEGLPlatformContext::Flags)