Debug Back To Front sorting in Qt3D

0001-DEBUG-Output-BackToFront-Sorting.patch

From 0e8ec609def938ba5dc816073605b66cc213c0b9 Mon Sep 17 00:00:00 2001
From: Andy Nichols <andy.nichols@qt.io>
Date: Wed, 16 May 2018 13:32:04 +0200
Subject: [PATCH] DEBUG: Output BackToFront Sorting

Obviously dont merge this...

Change-Id: I5227419e0692192ff153a0c272ab00f4994ad865
---
 src/render/renderers/opengl/renderer/renderview.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/render/renderers/opengl/renderer/renderview.cpp b/src/render/renderers/opengl/renderer/renderview.cpp
index c29448570..636b4d1fa 100644
--- a/src/render/renderers/opengl/renderer/renderview.cpp
+++ b/src/render/renderers/opengl/renderer/renderview.cpp
@@ -364,9 +364,22 @@ struct SubRangeSorter<QSortPolicy::BackToFront>
 {
     static void sortSubRange(CommandIt begin, const CommandIt end)
     {
-        std::stable_sort(begin, end, [] (RenderCommand *a, RenderCommand *b) {
+        QString outputString;
+        QTextStream outputStream(&outputString);
+        outputStream << "sortSubRange:\n";
+        std::for_each(begin, end, [&outputStream] (RenderCommand *a){
+           outputStream << "\t" << a << " " << a->m_depth << "\n";
+        });
+        //outputStream << "\tstable_sort\n";
+        std::stable_sort(begin, end, [&outputStream] (RenderCommand *a, RenderCommand *b) {
+            //outputStream << "\t\t" << a << " " << a->m_depth << " \t" << b << " " << b->m_depth << "\n";
             return a->m_depth > b->m_depth;
         });
+        outputStream << "sorted\n";
+        std::for_each(begin, end, [&outputStream] (RenderCommand *a){
+           outputStream << "\t" << a << " " << a->m_depth << "\n";
+        });
+        qDebug() << qPrintable(outputString);
     }
 };
 
-- 
2.14.3.windows.1