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, 12 insertions, 3 deletions

diff --git a/src/plugins/platforms/eglfs/api/qeglfscontext.cpp b/src/plugins/platforms/eglfs/api/qeglfscontext.cpp
index a17b567b24..9c10c1a998 100644
--- a/src/plugins/platforms/eglfs/api/qeglfscontext.cpp
+++ b/src/plugins/platforms/eglfs/api/qeglfscontext.cpp
@@ -22,10 +22,19 @@ QEglFSContext::QEglFSContext(const QSurfaceFormat &format, QPlatformOpenGLContex
 
 EGLSurface QEglFSContext::eglSurfaceForPlatformSurface(QPlatformSurface *surface)
 {
-    if (surface->surface()->surfaceClass() == QSurface::Window)
-        return static_cast<QEglFSWindow *>(surface)->surface();
-    else
+    if (surface->surface()->surfaceClass() == QSurface::Window) {
+
+        QEglFSWindow *w = static_cast<QEglFSWindow *>(surface);
+        EGLSurface s = w->surface();
+        if (s == EGL_NO_SURFACE) {
+            w->resetSurface();
+            s = w->surface();
+        }
+        return s;
+
+    } else {
         return static_cast<QEGLPbuffer *>(surface)->pbuffer();
+    }
 }
 
 EGLSurface QEglFSContext::createTemporaryOffscreenSurface()