[build] move headless rendering files to platform/default

1 files changed, 57 insertions, 0 deletions

diff --git a/platform/default/mbgl/gl/headless_backend.hpp b/platform/default/mbgl/gl/headless_backend.hpp
new file mode 100644
index 0000000000..da8c55e044
--- /dev/null
+++ b/platform/default/mbgl/gl/headless_backend.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <mbgl/gl/extension.hpp>
+
+#include <mbgl/map/backend.hpp>
+
+#include <memory>
+#include <functional>
+
+namespace mbgl {
+
+class HeadlessDisplay;
+
+class HeadlessBackend : public Backend {
+public:
+    HeadlessBackend();
+    HeadlessBackend(std::shared_ptr<HeadlessDisplay>);
+    ~HeadlessBackend() override;
+
+    void invalidate() override;
+    void activate() override;
+    void deactivate() override;
+    void notifyMapChange(MapChange) override;
+
+    void setMapChangeCallback(std::function<void(MapChange)>&& cb) { mapChangeCallback = std::move(cb); }
+
+    struct Impl {
+        virtual ~Impl() {}
+        virtual void activateContext() = 0;
+        virtual void deactivateContext() {}
+    };
+
+private:
+    // Implementation specific functions
+    static gl::glProc initializeExtension(const char*);
+
+    bool hasContext() const { return bool(impl); }
+    bool hasDisplay();
+
+    void createContext();
+
+private:
+    void destroyContext();
+
+    void activateContext();
+    void deactivateContext();
+
+    std::unique_ptr<Impl> impl;
+    std::shared_ptr<HeadlessDisplay> display;
+
+    bool extensionsLoaded = false;
+    bool active = false;
+
+    std::function<void(MapChange)> mapChangeCallback;
+};
+
+} // namespace mbgl