Begining of GLES3 renderer:

-Most 2D drawing is implemented
-Missing shaders
-Missing all 3D
-Editor needs to be set on update always to be used, otherwise it does not refresh
-Large parts of editor not working

scene/main/canvas_layer.cpp

@@ -246,6 +246,15 @@ Node* CanvasLayer::get_custom_viewport() const {
 	return custom_viewport;
 }
 
+void CanvasLayer::reset_sort_index() {
+	sort_index=0;
+}
+
+int CanvasLayer::get_sort_index() {
+
+	return sort_index++;
+}
+
 
 void CanvasLayer::_bind_methods() {
 
@@ -296,4 +305,5 @@ CanvasLayer::CanvasLayer() {
 	canvas = Ref<World2D>( memnew(World2D) );
 	custom_viewport=NULL;
 	custom_viewport_id=0;
+	sort_index=0;
 }