diff --git a/data/shaders/tessellation/pntriangles.tesc b/data/shaders/tessellation/pntriangles.tesc
index 50ff307..56f8d1c 100644
--- a/data/shaders/tessellation/pntriangles.tesc
+++ b/data/shaders/tessellation/pntriangles.tesc
@@ -33,6 +33,8 @@ layout(location = 0) out vec3 outNormal[3];
 layout(location = 3) out vec2 outUV[3];
 layout(location = 6) out PnPatch outPatch[3];
 
+layout(location = 16) patch out float outTessLevels[3];
+
 float wij(int i, int j)
 {
 	return dot(gl_in[j].gl_Position.xyz - gl_in[i].gl_Position.xyz, inNormal[i]);
@@ -81,6 +83,12 @@ void main()
 	outPatch[gl_InvocationID].n101 = N2+N0-vij(2,0)*(P0-P2);
 
 	// set tess levels
-	gl_TessLevelOuter[gl_InvocationID] = ubo.tessLevel;
-	gl_TessLevelInner[0] = ubo.tessLevel;
-}
\ No newline at end of file
+	outTessLevels[gl_InvocationID] = ubo.tessLevel;
+	barrier();
+	if (gl_InvocationID == 0) {
+		gl_TessLevelOuter[0] = outTessLevels[0];
+		gl_TessLevelOuter[1] = outTessLevels[1];
+		gl_TessLevelOuter[2] = outTessLevels[2];
+		gl_TessLevelInner[0] = ubo.tessLevel;
+	}
+}
diff --git a/data/shaders/tessellation/pntriangles.tesc.spv b/data/shaders/tessellation/pntriangles.tesc.spv
index d7c90ed..23e4117 100644
Binary files a/data/shaders/tessellation/pntriangles.tesc.spv and b/data/shaders/tessellation/pntriangles.tesc.spv differ