context reinit support

core/glmesh.cpp

@@ -64,6 +64,16 @@ void Mesh::init(QOpenGLExtraFunctions * f) {
 }
 
 
+void Mesh::reinit() {
+	buffer_geom.reinit();
+	buffer_ind .reinit();
+	QMapIterator<int, VertexObject * > it(vao_map);
+	while (it.hasNext())
+		it.next().value()->reinit();
+	changed = true;
+}
+
+
 void Mesh::destroy(QOpenGLExtraFunctions * f) {
 	buffer_geom.destroy(f);
 	buffer_ind .destroy(f);