From 6c4cb063c2a163bdec3f9b97f5ebd184fc869793 Mon Sep 17 00:00:00 2001
From: Bruno de Oliveira Abinader <bruno@mapbox.com>
Date: Mon, 1 Oct 2018 13:09:40 -0700
Subject: [Qt] UpdateParameters should always be available when rendering

---
 platform/qt/src/qmapboxgl.cpp              | 9 ++++++++-
 platform/qt/src/qmapboxgl_map_renderer.cpp | 5 ++---
 platform/qt/src/qmapboxgl_p.hpp            | 1 +
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/platform/qt/src/qmapboxgl.cpp b/platform/qt/src/qmapboxgl.cpp
index d584012830..e1fe7f5a37 100644
--- a/platform/qt/src/qmapboxgl.cpp
+++ b/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()
diff --git a/platform/qt/src/qmapboxgl_map_renderer.cpp b/platform/qt/src/qmapboxgl_map_renderer.cpp
index acc4194498..8c554dab7e 100644
--- a/platform/qt/src/qmapboxgl_map_renderer.cpp
+++ b/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;
diff --git a/platform/qt/src/qmapboxgl_p.hpp b/platform/qt/src/qmapboxgl_p.hpp
index b94f4de194..f13c548592 100644
--- a/platform/qt/src/qmapboxgl_p.hpp
+++ b/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;
-- 
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