[Qt] UpdateParameters should always be available when rendering

platform/qt/src/qmapboxgl.cpp

@@ -1817,11 +1817,13 @@ void QMapboxGLPrivate::update(std::shared_ptr<mbgl::UpdateParameters> parameters
 {
     std::lock_guard<std::recursive_mutex> lock(m_mapRendererMutex);
 
+    m_updateParameters = std::move(parameters);
+
     if (!m_mapRenderer) {
         return;
     }
 
-    m_mapRenderer->updateParameters(std::move(parameters));
+    m_mapRenderer->updateParameters(std::move(m_updateParameters));
 
     requestRendering();
 }
@@ -1856,6 +1858,11 @@ void QMapboxGLPrivate::createRenderer()
     connect(m_mapRenderer.get(), SIGNAL(needsRendering()), this, SLOT(requestRendering()));
 
     m_mapRenderer->setObserver(m_rendererObserver);
+
+    if (m_updateParameters) {
+        m_mapRenderer->updateParameters(m_updateParameters);
+        requestRendering();
+    }
 }
 
 void QMapboxGLPrivate::destroyRenderer()

platform/qt/src/qmapboxgl_map_renderer.cpp

@@ -71,9 +71,8 @@ void QMapboxGLMapRenderer::render()
         // Lock on the parameters
         std::lock_guard<std::mutex> lock(m_updateMutex);
 
-        if (!m_updateParameters) {
-            return;
-        }
+        // UpdateParameters should always be available when rendering.
+        assert(m_updateParameters);
 
         // Hold on to the update parameters during render
         params = m_updateParameters;

platform/qt/src/qmapboxgl_p.hpp

@@ -54,6 +54,7 @@ private:
 
     std::recursive_mutex m_mapRendererMutex;
     std::shared_ptr<mbgl::RendererObserver> m_rendererObserver;
+    std::shared_ptr<mbgl::UpdateParameters> m_updateParameters;
 
     std::unique_ptr<QMapboxGLMapObserver> m_mapObserver;
     std::shared_ptr<mbgl::DefaultFileSource> m_fileSourceObj;