Empty the ShaderEffect content cache on releaseResources

Just use a function because the private and impl classes for
QQuickShaderEffect do not have their own headers.

Change-Id: If5070aeb8c2b07b9b7e2cf3e16071ee2af2e368b
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

2 files changed, 12 insertions, 0 deletions

diff --git a/src/quick/items/qquickshadereffect.cpp b/src/quick/items/qquickshadereffect.cpp
index b4d9f9f69d..5365ab071e 100644
--- a/src/quick/items/qquickshadereffect.cpp
+++ b/src/quick/items/qquickshadereffect.cpp
@@ -1158,6 +1158,11 @@ static inline QVariant getValueFromProperty(QObject *item, const QMetaObject *it
 using QQuickShaderInfoCache = QHash<QUrl, QSGGuiThreadShaderEffectManager::ShaderInfo>;
 Q_GLOBAL_STATIC(QQuickShaderInfoCache, shaderInfoCache)
 
+void qtquick_shadereffect_purge_gui_thread_shader_cache()
+{
+    shaderInfoCache()->clear();
+}
+
 bool QQuickShaderEffectImpl::updateShader(Shader shaderType, const QUrl &fileUrl)
 {
     QSGGuiThreadShaderEffectManager *mgr = shaderEffectManager();
diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index 698ac341a4..37525d99d8 100644
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -1681,6 +1681,10 @@ QQuickWindow::~QQuickWindow()
     QQuickPixmap::purgeCache();
 }
 
+#if QT_CONFIG(quick_shadereffect)
+void qtquick_shadereffect_purge_gui_thread_shader_cache();
+#endif
+
 /*!
     This function tries to release redundant resources currently held by the QML scene.
 
@@ -1707,6 +1711,9 @@ void QQuickWindow::releaseResources()
     if (d->windowManager)
         d->windowManager->releaseResources(this);
     QQuickPixmap::purgeCache();
+#if QT_CONFIG(quick_shadereffect)
+    qtquick_shadereffect_purge_gui_thread_shader_cache();
+#endif
 }