[core] custom layer - add contextLost callback

- optional callback method that can be used to do cleanup when the context has been lost before re-initialisation

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mbgl/style/layers/custom_layer_impl.cpp b/src/mbgl/style/layers/custom_layer_impl.cpp
index 42e60c582c..1de268d2e2 100644
--- a/src/mbgl/style/layers/custom_layer_impl.cpp
+++ b/src/mbgl/style/layers/custom_layer_impl.cpp
@@ -6,12 +6,14 @@ namespace style {
 CustomLayer::Impl::Impl(const std::string& id_,
                          CustomLayerInitializeFunction initializeFn_,
                          CustomLayerRenderFunction renderFn_,
+                         CustomLayerContextLostFunction contextLostFn_,
                          CustomLayerDeinitializeFunction deinitializeFn_,
                          void* context_)
     : Layer::Impl(LayerType::Custom, id_, std::string()) {
     initializeFn = initializeFn_;
     renderFn = renderFn_;
     deinitializeFn = deinitializeFn_;
+    contextLostFn = contextLostFn_;
     context = context_;
 }