From afb65a869e1cc6d3afd215bc364db2fbf1374adb Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 5 Dec 2017 13:37:32 +0200
Subject: [PATCH] Check for EXT_gpu_shader4 support when binding fragment data
 locations

---
 source/programcompiler.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index c35fa275..b004b08b 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -1,4 +1,5 @@
 #include <msp/core/raii.h>
+#include <msp/gl/extensions/ext_gpu_shader4.h>
 #include <msp/strings/format.h>
 #include <msp/strings/utils.h>
 #include "error.h"
@@ -71,8 +72,11 @@ void ProgramCompiler::add_shaders(Program &program)
 		else if(i->type==FRAGMENT)
 		{
 			program.attach_shader_owned(new FragmentShader(apply<Formatter>(*i)));
-			for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
-				program.bind_fragment_data(j->second, j->first);
+			if(EXT_gpu_shader4)
+			{
+				for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
+					program.bind_fragment_data(j->second, j->first);
+			}
 		}
 	}
 }
@@ -1678,6 +1682,8 @@ void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
 			}
 			else if(stage->type==FRAGMENT && var.interface=="out")
 			{
+				if(location!=0)
+					static Require _req(EXT_gpu_shader4);
 				stage->locations[var.name] = location;
 				var.layout->qualifiers.erase(i);
 			}
-- 
2.43.0