From 2466dc155d5796705829b20ad249aa10295e4639 Mon Sep 17 00:00:00 2001
From: Mat Kelcey <matkelcey@google.com>
Date: Tue, 12 Jul 2016 13:46:48 -0700
Subject: [PATCH] fix for vertically flipped depth buffer in
 TinyRendererVisualShapeConverter::render

---
 .../TinyRendererVisualShapeConverter.cpp            | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/examples/SharedMemory/TinyRendererVisualShapeConverter.cpp b/examples/SharedMemory/TinyRendererVisualShapeConverter.cpp
index a4ceb2d45..92bca7498 100644
--- a/examples/SharedMemory/TinyRendererVisualShapeConverter.cpp
+++ b/examples/SharedMemory/TinyRendererVisualShapeConverter.cpp
@@ -624,6 +624,19 @@ void TinyRendererVisualShapeConverter::render(const float viewMat[16], const flo
 //	printf("flipped!\n");
 	m_data->m_rgbColorBuffer.flip_vertically();
 
+	//flip z-buffer
+	{
+		int half = m_data->m_swHeight>>1;
+		for (int j=0; j<half; j++)
+		{
+			unsigned long l1 = j*m_data->m_swWidth;
+			unsigned long l2 = (m_data->m_swHeight-1-j)*m_data->m_swWidth;
+			for (int i=0;i<m_data->m_swWidth;i++)
+			{
+				btSwap(m_data->m_depthBuffer[l1+i],m_data->m_depthBuffer[l2+i]);
+			}
+		}
+	}
 }
 
 void TinyRendererVisualShapeConverter::getWidthAndHeight(int& width, int& height)