1 files changed, 11 insertions, 0 deletions
diff --git a/src/mbgl/gl/attribute.cpp b/src/mbgl/gl/attribute.cpp
index 4983a8c204..1b43ad2b64 100644
--- a/src/mbgl/gl/attribute.cpp
+++ b/src/mbgl/gl/attribute.cpp
@@ -7,6 +7,17 @@ namespace gl {
 
 using namespace platform;
 
+optional<AttributeBinding> offsetAttributeBinding(const optional<AttributeBinding>& binding, std::size_t vertexOffset) {
+    assert(vertexOffset <= std::numeric_limits<uint32_t>::max());
+    if (binding) {
+        AttributeBinding result = *binding;
+        result.vertexOffset = static_cast<uint32_t>(vertexOffset);
+        return result;
+    } else {
+        return binding;
+    }
+}
+
 void bindAttributeLocation(Context& context, ProgramID id, AttributeLocation location, const char* name) {
     // We're using sequentially numberered attribute locations starting with 0. Therefore we can use
     // the location as a proxy for the number of attributes.