Calculate smooth normals in TES

shaders/tessellation_ctrl.glsl

@@ -15,17 +15,18 @@ out TC_OUT {
 uniform float tessellationFactor;
 
 void main() {
-    // Pass through position and texture coordinates to the tessellation evaluation shader
-    tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
-    tc_out[gl_InvocationID].texCoord = tc_in[gl_InvocationID].texCoord;
-
     // Set tessellation levels
     if (gl_InvocationID == 0) {
         gl_TessLevelOuter[0] = tessellationFactor; // Level of tessellation along one edge
         gl_TessLevelOuter[1] = tessellationFactor; // Level of tessellation along another edge
         gl_TessLevelOuter[2] = tessellationFactor; // Level of tessellation along the other edge
         gl_TessLevelOuter[3] = tessellationFactor; // Level of tessellation along the other edge
+
         gl_TessLevelInner[0] = tessellationFactor; // Level of tessellation for the inner part
         gl_TessLevelInner[1] = tessellationFactor; // Level of tessellation for the inner part
     }
+
+    // Pass through position and texture coordinates to the tessellation evaluation shader
+    tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
+    tc_out[gl_InvocationID].texCoord = tc_in[gl_InvocationID].texCoord;
 }