1 files changed, 70 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLRendererFrontend.h b/platform/darwin/src/MGLRendererFrontend.h
new file mode 100644
index 0000000000..76904d008b
--- /dev/null
+++ b/platform/darwin/src/MGLRendererFrontend.h
@@ -0,0 +1,70 @@
+#include <mbgl/renderer/backend_scope.hpp>
+#include <mbgl/renderer/renderer.hpp>
+#include <mbgl/renderer/renderer_backend.hpp>
+#include <mbgl/renderer/renderer_frontend.hpp>
+#include <mbgl/util/async_task.hpp>
+#include <mbgl/util/optional.hpp>
+
+
+/**
+ The RenderFrontend is passed to the Map to facilitate rendering in a platform
+ dependent way.
+ */
+class MGLRenderFrontend : public mbgl::RendererFrontend
+{
+public:
+    MGLRenderFrontend(std::unique_ptr<mbgl::Renderer> renderer_, MGLMapView* nativeView_, mbgl::RendererBackend& mbglBackend_, bool async = false)
+        : renderer(std::move(renderer_))
+        , nativeView(nativeView_)
+        , mbglBackend(mbglBackend_) {
+        if (async) {
+            asyncInvalidate.emplace([&]() {
+                [nativeView setNeedsGLDisplay];
+            });
+        }
+    }
+    
+    void reset() override {
+        if (renderer) {
+            renderer.reset();
+        }
+    }
+    
+    void update(std::shared_ptr<mbgl::UpdateParameters> updateParameters_) override {
+        updateParameters = std::move(updateParameters_);
+        if (asyncInvalidate) {
+            asyncInvalidate->send();
+        } else {
+            [nativeView setNeedsGLDisplay];
+        }
+    }
+    
+    void setObserver(mbgl::RendererObserver& observer) override {
+        if (!renderer) return;
+        renderer->setObserver(&observer);
+    }
+    
+    void render() {
+        if (!renderer || !updateParameters) return;
+        
+        mbgl::BackendScope guard { mbglBackend, mbgl::BackendScope::ScopeType::Implicit };
+        
+        renderer->render(*updateParameters);
+    }
+    
+    mbgl::Renderer* getRenderer() {
+        return renderer.get();
+    }
+    
+    void onLowMemory() {
+        if (!renderer)  return;
+        renderer->onLowMemory();
+    }
+    
+private:
+    std::unique_ptr<mbgl::Renderer> renderer;
+    __weak MGLMapView *nativeView = nullptr;
+    mbgl::RendererBackend& mbglBackend;
+    std::shared_ptr<mbgl::UpdateParameters> updateParameters;
+    mbgl::optional<mbgl::util::AsyncTask> asyncInvalidate;
+};