From c80781045dfbf0ccb2214a3377ee9dc046ecbcab Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Thu, 28 Apr 2016 09:09:22 +1000
Subject: [PATCH] Skip drawing sprite groups we can never see.

---
 ClassicalSharp/Rendering/MapRenderer.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ClassicalSharp/Rendering/MapRenderer.cs b/ClassicalSharp/Rendering/MapRenderer.cs
index dbad69a57..e3530769a 100644
--- a/ClassicalSharp/Rendering/MapRenderer.cs
+++ b/ClassicalSharp/Rendering/MapRenderer.cs
@@ -145,8 +145,16 @@ namespace ClassicalSharp.Renderers {
 					DrawPart( info, ref part );			
 				
 				if( part.SpriteCount > 0 ) {
+					int groupCount = part.SpriteCount / 4;
 					api.FaceCulling = true;
-					api.DrawIndexedVb_TrisT2fC4b( part.SpriteCount, 0 );
+					if( info.DrawRight || info.DrawFront )
+						api.DrawIndexedVb_TrisT2fC4b( groupCount, 0 );
+					if( info.DrawLeft || info.DrawBack )
+						api.DrawIndexedVb_TrisT2fC4b( groupCount, groupCount );
+					if( info.DrawLeft || info.DrawFront )
+						api.DrawIndexedVb_TrisT2fC4b( groupCount, groupCount * 2 );
+					if( info.DrawRight || info.DrawBack )
+						api.DrawIndexedVb_TrisT2fC4b( groupCount, groupCount * 3 );
 					api.FaceCulling = false;
 				}
 				game.Vertices += part.IndicesCount;