diff options
Diffstat (limited to 'platform/ios/MGLMapView.mm')
| -rw-r--r-- | platform/ios/MGLMapView.mm | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/platform/ios/MGLMapView.mm b/platform/ios/MGLMapView.mm index b1932737b7..45c96e7c3b 100644 --- a/platform/ios/MGLMapView.mm +++ b/platform/ios/MGLMapView.mm @@ -37,6 +37,7 @@ const std::string &defaultCacheDatabase() { return path; } +static dispatch_once_t loadGLExtensions; extern NSString *const MGLStyleKeyGeneric; extern NSString *const MGLStyleKeyFill; @@ -213,8 +214,9 @@ mbgl::DefaultFileSource *mbglFileSource = nullptr; // load extensions // - const std::string extensions = (char *)glGetString(GL_EXTENSIONS); - { + dispatch_once(&loadGLExtensions, ^{ + const std::string extensions = (char *)glGetString(GL_EXTENSIONS); + using namespace mbgl; if (extensions.find("GL_OES_vertex_array_object") != std::string::npos) { @@ -231,7 +233,7 @@ mbgl::DefaultFileSource *mbglFileSource = nullptr; if (extensions.find("GL_OES_depth24") != std::string::npos) { gl::isDepth24Supported = YES; } - } + }); // setup mbgl map // |