[opencl] Cache the context

qgis · Aug 8, 2018 · 54b5821 · 54b5821
1 parent e29c7e5
commit 54b5821
Showing 1 changed file with 9 additions and 7 deletions.
diff --git a/src/core/qgsopenclutils.cpp b/src/core/qgsopenclutils.cpp
@@ -294,14 +294,16 @@ QString QgsOpenClUtils::errorText( const int errorCode )
 
 cl::Context QgsOpenClUtils::context()
 {
-  if ( available() && sPlatform() && sDevice() )
+  static cl::Context context;
+  static std::once_flag contextCreated;
+  std::call_once( contextCreated, [ = ]()
   {
-    return cl::Context( sDevice );
+    if ( available() && sPlatform() && sDevice() )
-  }
+    {
-  else
+      context = cl::Context( sDevice );
-  {
+    }
-    return cl::Context();
+  } );
-  }
+  return context;
 }
 
 cl::Program QgsOpenClUtils::buildProgram( const cl::Context &context, const QString &source, ExceptionBehavior exceptionBehavior )