[test] allow only a single shared display to avoid egl errors

1 files changed, 15 insertions, 1 deletions

diff --git a/platform/default/mbgl/gl/headless_display.hpp b/platform/default/mbgl/gl/headless_display.hpp
index a5c95085b8..8c294655e5 100644
--- a/platform/default/mbgl/gl/headless_display.hpp
+++ b/platform/default/mbgl/gl/headless_display.hpp
@@ -6,13 +6,27 @@ namespace mbgl {
 
 class HeadlessDisplay {
 public:
-    HeadlessDisplay();
+    static std::shared_ptr<HeadlessDisplay> create() {
+        static std::weak_ptr<HeadlessDisplay> instance;
+        
+        auto shared = instance.lock();
+        
+        if (!shared) {
+            instance = shared = std::shared_ptr<HeadlessDisplay>(new HeadlessDisplay());
+        }
+        
+        return shared;
+    }
+
+    
     ~HeadlessDisplay();
 
     template <typename DisplayAttribute>
     DisplayAttribute attribute() const;
 
 private:
+    HeadlessDisplay();
+    
     class Impl;
     std::unique_ptr<Impl>  impl;
 };