Something about tessellation shader.

OpenGL OpenGL: Basic Coding
1

Hello everyone , I’m a newbie of Opengl,:slight_smile:
I want to know ,when I write TCS like this
#version 420 core

	layout (vertices =16) out;                                                          
	void main(void)                                                                     
	{                                                                                   
	    if (gl_InvocationID == 3)                                                      
	    {                                                                             
	        gl_TessLevelInner[0] = 4.0;                                                 
	        gl_TessLevelInner[1] = 4.0;                                                 
	        gl_TessLevelOuter[0] = 4.0;                                                 
	        gl_TessLevelOuter[1] = 4.0;                                                 
	        gl_TessLevelOuter[2] = 4.0;                                                 
	        gl_TessLevelOuter[3] = 4.0;                                                 
	    }                                                                               
		 	 																			 
	    gl_out[gl_InvocationID].gl_Position =gl_in[gl_InvocationID].gl_Position;        
	}                                                                                   
};

This can break a patch(actually a quad) to a 4*4 grid.I want to where those 16 output control points are?what if I set the value to 11 or 12?
Thanks for answering my question.