diff --git a/Source/Core/VideoCommon/GeometryShaderGen.cpp b/Source/Core/VideoCommon/GeometryShaderGen.cpp
index 057e697ed8..de76557d5e 100644
--- a/Source/Core/VideoCommon/GeometryShaderGen.cpp
+++ b/Source/Core/VideoCommon/GeometryShaderGen.cpp
@@ -82,7 +82,7 @@ static T GenerateGeometryShader(u32 primitive_type, API_TYPE ApiType)
 	uid_data->pixel_lighting = g_ActiveConfig.bEnablePixelLighting;
 
 	out.Write("struct VS_OUTPUT {\n");
-	GenerateVSOutputMembers<T>(out, ApiType);
+	GenerateVSOutputMembers<T>(out, ApiType, "");
 	out.Write("};\n");
 
 	if (ApiType == API_OPENGL)
@@ -90,15 +90,16 @@ static T GenerateGeometryShader(u32 primitive_type, API_TYPE ApiType)
 		if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
 			out.Write("#define InstanceID gl_InvocationID\n");
 
+		out.Write("// The interface block qualifier is duplicated to its member due to Apple OS X bug 24983074\n");
 		out.Write("in VertexData {\n");
-		GenerateVSOutputMembers<T>(out, ApiType, GetInterpolationQualifier(ApiType, true, true));
+		GenerateVSOutputMembers<T>(out, ApiType, "in", GetInterpolationQualifier());
 		out.Write("} vs[%d];\n", vertex_in);
 
 		out.Write("out VertexData {\n");
-		GenerateVSOutputMembers<T>(out, ApiType, GetInterpolationQualifier(ApiType, false, true));
+		GenerateVSOutputMembers<T>(out, ApiType, "out", GetInterpolationQualifier());
 
 		if (g_ActiveConfig.iStereoMode > 0)
-			out.Write("\tflat int layer;\n");
+			out.Write("\tflat out int layer;\n");
 
 		out.Write("} ps;\n");
 
diff --git a/Source/Core/VideoCommon/PixelShaderGen.cpp b/Source/Core/VideoCommon/PixelShaderGen.cpp
index f9781c5217..a7cdcc3b4a 100644
--- a/Source/Core/VideoCommon/PixelShaderGen.cpp
+++ b/Source/Core/VideoCommon/PixelShaderGen.cpp
@@ -282,7 +282,7 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
 	}
 
 	out.Write("struct VS_OUTPUT {\n");
-	GenerateVSOutputMembers<T>(out, ApiType);
+	GenerateVSOutputMembers<T>(out, ApiType, "");
 	out.Write("};\n");
 
 	const bool forced_early_z = g_ActiveConfig.backend_info.bSupportsEarlyZ && bpmem.UseEarlyDepthTest()
@@ -354,29 +354,30 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
 		uid_data->stereo = g_ActiveConfig.iStereoMode > 0;
 		if (g_ActiveConfig.backend_info.bSupportsGeometryShaders)
 		{
+			out.Write("// The interface block qualifier is duplicated to its member due to Apple OS X bug 24983074\n");
 			out.Write("in VertexData {\n");
-			GenerateVSOutputMembers<T>(out, ApiType, GetInterpolationQualifier(ApiType, true, true));
+			GenerateVSOutputMembers<T>(out, ApiType, "in", GetInterpolationQualifier());
 
 			if (g_ActiveConfig.iStereoMode > 0)
-				out.Write("\tflat int layer;\n");
+				out.Write("\tflat in int layer;\n");
 
 			out.Write("};\n");
 		}
 		else
 		{
-			out.Write("%s in float4 colors_0;\n", GetInterpolationQualifier(ApiType));
-			out.Write("%s in float4 colors_1;\n", GetInterpolationQualifier(ApiType));
+			out.Write("%s in float4 colors_0;\n", GetInterpolationQualifier());
+			out.Write("%s in float4 colors_1;\n", GetInterpolationQualifier());
 			// compute window position if needed because binding semantic WPOS is not widely supported
 			// Let's set up attributes
 			for (unsigned int i = 0; i < numTexgen; ++i)
 			{
-				out.Write("%s in float3 uv%d;\n", GetInterpolationQualifier(ApiType), i);
+				out.Write("%s in float3 uv%d;\n", GetInterpolationQualifier(), i);
 			}
-			out.Write("%s in float4 clipPos;\n", GetInterpolationQualifier(ApiType));
+			out.Write("%s in float4 clipPos;\n", GetInterpolationQualifier());
 			if (g_ActiveConfig.bEnablePixelLighting)
 			{
-				out.Write("%s in float3 Normal;\n", GetInterpolationQualifier(ApiType));
-				out.Write("%s in float3 WorldPos;\n", GetInterpolationQualifier(ApiType));
+				out.Write("%s in float3 Normal;\n", GetInterpolationQualifier());
+				out.Write("%s in float3 WorldPos;\n", GetInterpolationQualifier());
 			}
 		}
 
@@ -397,17 +398,17 @@ static T GeneratePixelShader(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType)
 			dstAlphaMode == DSTALPHA_DUAL_SOURCE_BLEND ? "\n  out float4 ocol1 : SV_Target1," : "",
 			per_pixel_depth ? "\n  out float depth : SV_Depth," : "");
 
-		out.Write("  in %s float4 colors_0 : COLOR0,\n", GetInterpolationQualifier(ApiType));
-		out.Write("  in %s float4 colors_1 : COLOR1\n", GetInterpolationQualifier(ApiType));
+		out.Write("  in %s float4 colors_0 : COLOR0,\n", GetInterpolationQualifier());
+		out.Write("  in %s float4 colors_1 : COLOR1\n", GetInterpolationQualifier());
 
 		// compute window position if needed because binding semantic WPOS is not widely supported
 		for (unsigned int i = 0; i < numTexgen; ++i)
-			out.Write(",\n  in %s float3 uv%d : TEXCOORD%d", GetInterpolationQualifier(ApiType), i, i);
-		out.Write(",\n  in %s float4 clipPos : TEXCOORD%d", GetInterpolationQualifier(ApiType), numTexgen);
+			out.Write(",\n  in %s float3 uv%d : TEXCOORD%d", GetInterpolationQualifier(), i, i);
+		out.Write(",\n  in %s float4 clipPos : TEXCOORD%d", GetInterpolationQualifier(), numTexgen);
 		if (g_ActiveConfig.bEnablePixelLighting)
 		{
-			out.Write(",\n  in %s float3 Normal : TEXCOORD%d", GetInterpolationQualifier(ApiType), numTexgen + 1);
-			out.Write(",\n  in %s float3 WorldPos : TEXCOORD%d", GetInterpolationQualifier(ApiType), numTexgen + 2);
+			out.Write(",\n  in %s float3 Normal : TEXCOORD%d", GetInterpolationQualifier(), numTexgen + 1);
+			out.Write(",\n  in %s float3 WorldPos : TEXCOORD%d", GetInterpolationQualifier(), numTexgen + 2);
 		}
 		uid_data->stereo = g_ActiveConfig.iStereoMode > 0;
 		if (g_ActiveConfig.iStereoMode > 0)
diff --git a/Source/Core/VideoCommon/ShaderGenCommon.h b/Source/Core/VideoCommon/ShaderGenCommon.h
index a6e7ce0b36..9283cdc8cc 100644
--- a/Source/Core/VideoCommon/ShaderGenCommon.h
+++ b/Source/Core/VideoCommon/ShaderGenCommon.h
@@ -214,12 +214,12 @@ private:
 };
 
 template<class T>
-inline void DefineOutputMember(T& object, API_TYPE api_type, const char* qualifier, const char* type, const char* name, int var_index, const char* semantic = "", int semantic_index = -1)
+inline void DefineOutputMember(T& object, API_TYPE api_type, const char* qualifier, const char* in_out, const char* type, const char* name, int var_index, const char* semantic = "", int semantic_index = -1)
 {
 	if (qualifier != nullptr)
-		object.Write("\t%s %s %s", qualifier, type, name);
+		object.Write("\t%s %s %s %s", qualifier, in_out, type, name);
 	else
-		object.Write("\t%s %s", type, name);
+		object.Write("\t%s %s %s", in_out, type, name);
 
 	if (var_index != -1)
 		object.Write("%d", var_index);
@@ -236,21 +236,21 @@ inline void DefineOutputMember(T& object, API_TYPE api_type, const char* qualifi
 }
 
 template<class T>
-inline void GenerateVSOutputMembers(T& object, API_TYPE api_type, const char* qualifier = nullptr)
+inline void GenerateVSOutputMembers(T& object, API_TYPE api_type, const char* in_out, const char* qualifier = nullptr)
 {
-	DefineOutputMember(object, api_type, qualifier, "float4", "pos", -1, "POSITION");
-	DefineOutputMember(object, api_type, qualifier, "float4", "colors_", 0, "COLOR", 0);
-	DefineOutputMember(object, api_type, qualifier, "float4", "colors_", 1, "COLOR", 1);
+	DefineOutputMember(object, api_type, qualifier, in_out, "float4", "pos", -1, "POSITION");
+	DefineOutputMember(object, api_type, qualifier, in_out, "float4", "colors_", 0, "COLOR", 0);
+	DefineOutputMember(object, api_type, qualifier, in_out, "float4", "colors_", 1, "COLOR", 1);
 
 	for (unsigned int i = 0; i < xfmem.numTexGen.numTexGens; ++i)
-		DefineOutputMember(object, api_type, qualifier, "float3", "tex", i, "TEXCOORD", i);
+		DefineOutputMember(object, api_type, qualifier, in_out, "float3", "tex", i, "TEXCOORD", i);
 
-	DefineOutputMember(object, api_type, qualifier, "float4", "clipPos", -1, "TEXCOORD", xfmem.numTexGen.numTexGens);
+	DefineOutputMember(object, api_type, qualifier, in_out, "float4", "clipPos", -1, "TEXCOORD", xfmem.numTexGen.numTexGens);
 
 	if (g_ActiveConfig.bEnablePixelLighting)
 	{
-		DefineOutputMember(object, api_type, qualifier, "float3", "Normal", -1, "TEXCOORD", xfmem.numTexGen.numTexGens + 1);
-		DefineOutputMember(object, api_type, qualifier, "float3", "WorldPos", -1, "TEXCOORD", xfmem.numTexGen.numTexGens + 2);
+		DefineOutputMember(object, api_type, qualifier, in_out, "float3", "Normal", -1, "TEXCOORD", xfmem.numTexGen.numTexGens + 1);
+		DefineOutputMember(object, api_type, qualifier, in_out, "float3", "WorldPos", -1, "TEXCOORD", xfmem.numTexGen.numTexGens + 2);
 	}
 }
 
@@ -281,17 +281,13 @@ inline void AssignVSOutputMembers(T& object, const char* a, const char* b)
 // As a workaround, we interpolate at the centroid of the coveraged pixel, which
 // is always inside the primitive.
 // Without MSAA, this flag is defined to have no effect.
-inline const char* GetInterpolationQualifier(API_TYPE api_type, bool in = true, bool in_out = false)
+inline const char* GetInterpolationQualifier()
 {
 	if (g_ActiveConfig.iMultisamples <= 1)
 		return "";
 
 	if (!g_ActiveConfig.bSSAA)
-	{
-		if (in_out && api_type == API_OPENGL && !g_ActiveConfig.backend_info.bSupportsBindingLayout)
-			return in ? "centroid in" : "centroid out";
 		return "centroid";
-	}
 
 	return "sample";
 }
diff --git a/Source/Core/VideoCommon/VertexShaderGen.cpp b/Source/Core/VideoCommon/VertexShaderGen.cpp
index 9a9a23b5b9..427656766e 100644
--- a/Source/Core/VideoCommon/VertexShaderGen.cpp
+++ b/Source/Core/VideoCommon/VertexShaderGen.cpp
@@ -41,7 +41,7 @@ static T GenerateVertexShader(API_TYPE api_type)
 	out.Write("};\n");
 
 	out.Write("struct VS_OUTPUT {\n");
-	GenerateVSOutputMembers<T>(out, api_type);
+	GenerateVSOutputMembers<T>(out, api_type, "");
 	out.Write("};\n");
 
 	uid_data->numTexGens = xfmem.numTexGen.numTexGens;
@@ -74,8 +74,9 @@ static T GenerateVertexShader(API_TYPE api_type)
 
 		if (g_ActiveConfig.backend_info.bSupportsGeometryShaders)
 		{
+			out.Write("// The interface block qualifier is duplicated to its member due to Apple OS X bug 24983074\n");
 			out.Write("out VertexData {\n");
-			GenerateVSOutputMembers<T>(out, api_type, GetInterpolationQualifier(api_type, false, true));
+			GenerateVSOutputMembers<T>(out, api_type, "out", GetInterpolationQualifier());
 			out.Write("} vs;\n");
 		}
 		else
@@ -85,17 +86,17 @@ static T GenerateVertexShader(API_TYPE api_type)
 			{
 				if (i < xfmem.numTexGen.numTexGens)
 				{
-					out.Write("%s out float3 uv%u;\n", GetInterpolationQualifier(api_type), i);
+					out.Write("%s out float3 uv%u;\n", GetInterpolationQualifier(), i);
 				}
 			}
-			out.Write("%s out float4 clipPos;\n", GetInterpolationQualifier(api_type));
+			out.Write("%s out float4 clipPos;\n", GetInterpolationQualifier());
 			if (g_ActiveConfig.bEnablePixelLighting)
 			{
-				out.Write("%s out float3 Normal;\n", GetInterpolationQualifier(api_type));
-				out.Write("%s out float3 WorldPos;\n", GetInterpolationQualifier(api_type));
+				out.Write("%s out float3 Normal;\n", GetInterpolationQualifier());
+				out.Write("%s out float3 WorldPos;\n", GetInterpolationQualifier());
 			}
-			out.Write("%s out float4 colors_0;\n", GetInterpolationQualifier(api_type));
-			out.Write("%s out float4 colors_1;\n", GetInterpolationQualifier(api_type));
+			out.Write("%s out float4 colors_0;\n", GetInterpolationQualifier());
+			out.Write("%s out float4 colors_1;\n", GetInterpolationQualifier());
 		}
 
 		out.Write("void main()\n{\n");