[core] Move OpenGL extension initialization to Backend

1 files changed, 9 insertions, 2 deletions

diff --git a/src/mbgl/map/backend.cpp b/src/mbgl/map/backend.cpp
index a1a2f8f3a8..29f7522e4f 100644
--- a/src/mbgl/map/backend.cpp
+++ b/src/mbgl/map/backend.cpp
@@ -1,16 +1,23 @@
 #include <mbgl/map/backend.hpp>
 #include <mbgl/map/backend_scope.hpp>
 #include <mbgl/gl/context.hpp>
+#include <mbgl/gl/extension.hpp>
+#include <mbgl/gl/debugging.hpp>
 
 #include <cassert>
 
 namespace mbgl {
 
-Backend::Backend() : context(std::make_unique<gl::Context>()) {
-}
+Backend::Backend() = default;
 
 gl::Context& Backend::getContext() {
     assert(BackendScope::exists());
+    std::call_once(initialized, [this] {
+        context = std::make_unique<gl::Context>();
+        gl::debugging::enable();
+        gl::initializeExtensions(
+            std::bind(&Backend::initializeExtension, this, std::placeholders::_1));
+    });
     return *context;
 }