These ones come in two parts!
	A little more going on that some other types
	There's actually quite a bit of flexibility
	They're intended to do geometry manipulation, but quickly
		More parallel
	This is the sequence:
		Tesselation Control Shaders run
		Tesselation Primitive Generator (fixed) creates more primitives (triangles usually)
		Tessellation Evaluation Shader is run on output from TPG

TCS input/output:
	input:
		gl_in array a lot like a geometry shader
		gl_InvocationID, but it's related to which vertex we're working on	
	output:
		Tessellation Level (gl_TessLevelOuter, gl_TessLevelInner)
		Vertices (can move these around) in gl_out
		You can actually set up this stage with glPatchParameterfv instead of programming it
	
TES input/output:
	input:
		gl_TessCoord (vec3, barycentric)
		gl_in with patch vertices
	output:
		gl_Position
		color (maybe)
		
Alright, can we make a round cube?
	What is a round cube?
	It's a cube the way the spiky cube was a cube...

My demo runs a geometry shader to turn the output into lines
	We can use triangles, it's just easier to see what's happening with lines
	You don't have to use a geometry shader
	I had one around that makes triangles into lines

Alright, can we figure out how close the cube is, and adapt our level?
	Transform a point using the MVP matrix
	See how far away it is	

Next:  Compute Shaders
	That's my plan anyway
	Maybe a simulation of bouncing balls or something
	That way we'll have covered all the shader types