ShaderBuilder: ensure no old updates are left over

Could result in trying to send updates to nodes which have been destroyed.

Change-Id: I3709277e5005f25ec8cb9efe0a2152f879bea89f
Reviewed-by: Mike Krus <mike.krus@kdab.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/src/render/materialsystem/shaderbuilder.cpp b/src/render/materialsystem/shaderbuilder.cpp
index 4e9327003..23f1400c9 100644
--- a/src/render/materialsystem/shaderbuilder.cpp
+++ b/src/render/materialsystem/shaderbuilder.cpp
@@ -145,6 +145,7 @@ void ShaderBuilder::cleanup()
     m_enabledLayers.clear();
     m_graphs.clear();
     m_dirtyTypes.clear();
+    m_pendingUpdates.clear();
     QBackendNode::setEnabled(false);
 }
 
diff --git a/src/render/materialsystem/shaderbuilder_p.h b/src/render/materialsystem/shaderbuilder_p.h
index ac7a165b8..0a799afaa 100644
--- a/src/render/materialsystem/shaderbuilder_p.h
+++ b/src/render/materialsystem/shaderbuilder_p.h
@@ -95,7 +95,7 @@ public:
 
     void syncFromFrontEnd(const Qt3DCore::QNode *frontEnd, bool firstTime) override;
 
-    QVector<ShaderBuilderUpdate> &updates() { return m_pendingUpdates; }
+    QVector<ShaderBuilderUpdate> takePendingUpdates() { return std::move(m_pendingUpdates); }
 
 private:
     void setEnabledLayers(const QStringList &layers);
diff --git a/src/render/renderers/opengl/renderer/renderer.cpp b/src/render/renderers/opengl/renderer/renderer.cpp
index 3da9b6c48..c3e986854 100644
--- a/src/render/renderers/opengl/renderer/renderer.cpp
+++ b/src/render/renderers/opengl/renderer/renderer.cpp
@@ -1115,7 +1115,7 @@ void Renderer::reloadDirtyShaders()
 
                         if (shaderBuilder->isShaderCodeDirty(shaderType)) {
                             shaderBuilder->generateCode(shaderType);
-                            m_shaderBuilderUpdates.append(std::move(shaderBuilder->updates()));
+                            m_shaderBuilderUpdates.append(shaderBuilder->takePendingUpdates());
                         }
 
                         const auto code = shaderBuilder->shaderCode(shaderType);
@@ -1143,9 +1143,9 @@ void Renderer::sendShaderChangesToFrontend(Qt3DCore::QAspectManager *manager)
         if (s->requiresFrontendSync()) {
             QShaderProgram *frontend = static_cast<decltype(frontend)>(manager->lookupNode(s->peerId()));
             QShaderProgramPrivate *dFrontend = static_cast<decltype(dFrontend)>(QNodePrivate::get(frontend));
+            s->unsetRequiresFrontendSync();
             dFrontend->setStatus(s->status());
             dFrontend->setLog(s->log());
-            s->unsetRequiresFrontendSync();
         }
     }