spg-project/resources/background.tcs

#version 430

layout (vertices = 1) out;

uniform int splits;

void main(void) {	
    gl_TessLevelOuter[0] = splits;
	gl_TessLevelOuter[1] = splits;
	gl_TessLevelOuter[2] = splits;
	gl_TessLevelOuter[3] = splits;
	gl_TessLevelInner[0] = splits;
	gl_TessLevelInner[1] = splits;
}