Add shaders that will just return positional information

shader/posTwoD/bezierQuad.vert

@@ -0,0 +1,15 @@
+#version 430 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec4 color;
+layout (location = 2) in vec4 boxes;
+layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+out vec4 vColor;
+out vec2 boxOut;
+out vec2 boxIn;
+void main()
+{
+  gl_Position = theMat * vec4(position.xyz,1);
+  vColor  = color;
+  boxOut = boxes.xy ;
+  boxIn = boxes.zw ;
+}