[core] Expose a way of flushing the graphics pipeline

Useful for apps before going to background that are
restricted by the OS of performing any operation.

2 files changed, 9 insertions, 0 deletions

diff --git a/src/mbgl/gl/context.cpp b/src/mbgl/gl/context.cpp
index bc703db401..5ce035f691 100644
--- a/src/mbgl/gl/context.cpp
+++ b/src/mbgl/gl/context.cpp
@@ -787,5 +787,9 @@ void Context::performCleanup() {
     }
 }
 
+void Context::flush() {
+    MBGL_CHECK_ERROR(glFinish());
+}
+
 } // namespace gl
 } // namespace mbgl
diff --git a/src/mbgl/gl/context.hpp b/src/mbgl/gl/context.hpp
index 338a294b47..d9f27eacc0 100644
--- a/src/mbgl/gl/context.hpp
+++ b/src/mbgl/gl/context.hpp
@@ -116,6 +116,11 @@ public:
     // Only call this while the OpenGL context is exclusive to this thread.
     void reset();
 
+    // Flush pending graphics commands. Will block until the pipeline
+    // is empty. Should be used only with a very good reason because
+    // it will have a performance impact.
+    void flush();
+
     bool empty() const {
         return pooledTextures.empty()
             && abandonedPrograms.empty()