[core] Create BackendScopes in Renderer, assert in Impl

This avoids a long series of reset() calls in the Impl.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/mbgl/renderer/renderer.cpp b/src/mbgl/renderer/renderer.cpp
index 9f4b897d6e..7e8c7e4e4c 100644
--- a/src/mbgl/renderer/renderer.cpp
+++ b/src/mbgl/renderer/renderer.cpp
@@ -15,7 +15,10 @@ Renderer::Renderer(RendererBackend& backend,
                                       contextMode_, std::move(programCacheDir_))) {
 }
 
-Renderer::~Renderer() = default;
+Renderer::~Renderer() {
+    BackendScope guard { impl->backend };
+    impl.reset();
+}
 
 void Renderer::setObserver(RendererObserver* observer) {
     impl->setObserver(observer);
@@ -72,6 +75,7 @@ void Renderer::dumpDebugLogs() {
 }
 
 void Renderer::onLowMemory() {
+    BackendScope guard { impl->backend };
     impl->onLowMemory();
 }