1 files changed, 72 insertions, 0 deletions
diff --git a/platform/default/mbgl/gl/headless_backend.cpp b/platform/default/mbgl/gl/headless_backend.cpp
new file mode 100644
index 0000000000..0bfdf11c98
--- /dev/null
+++ b/platform/default/mbgl/gl/headless_backend.cpp
@@ -0,0 +1,72 @@
+#include <mbgl/gl/headless_backend.hpp>
+#include <mbgl/gl/headless_display.hpp>
+
+#include <cassert>
+#include <stdexcept>
+#include <type_traits>
+
+namespace mbgl {
+
+HeadlessBackend::HeadlessBackend() {
+    activate();
+}
+
+HeadlessBackend::HeadlessBackend(std::shared_ptr<HeadlessDisplay> display_)
+        : display(std::move(display_)) {
+    activate();
+}
+
+HeadlessBackend::~HeadlessBackend() {
+    deactivate();
+    destroyContext();
+}
+
+void HeadlessBackend::activate() {
+    active = true;
+
+    if (!hasContext()) {
+        if (!hasDisplay()) {
+            throw std::runtime_error("Display is not set");
+        }
+        createContext();
+    }
+
+    activateContext();
+
+    if (!extensionsLoaded) {
+        gl::InitializeExtensions(initializeExtension);
+        extensionsLoaded = true;
+    }
+}
+
+void HeadlessBackend::deactivate() {
+    deactivateContext();
+    active = false;
+}
+
+void HeadlessBackend::invalidate() {
+    assert(false);
+}
+
+void HeadlessBackend::destroyContext() {
+    assert(hasContext());
+    impl.reset();
+}
+
+void HeadlessBackend::activateContext() {
+    assert(hasContext());
+    impl->activateContext();
+}
+
+void HeadlessBackend::deactivateContext() {
+    assert(hasContext());
+    impl->deactivateContext();
+}
+
+void HeadlessBackend::notifyMapChange(MapChange change) {
+    if (mapChangeCallback) {
+        mapChangeCallback(change);
+    }
+}
+
+} // namespace mbgl