anchor.diff:  attribute vec2 vertex;
   uniform mat4 mvpMatrix;
   void main(void) {
  -    gl_Position = mvpMatrix * vec4(vertex, 0.0, 1.0);
  +    gl_Position = gl_ModelViewMatrix * vec4(vertex, 0.0, 1.0);
   }
   ")
   
  
positive.code: (require 'cl-glu)
  (require 'cl-glut)
  (require 'zpb-ttf)
  
  ;; Glyph vertex
  (defvar +vs-source+ "#version 130
  
negative.code: }
  ")
  
  (defvar *window-width* 640)
  (defvar *window-height* 480)
  (defvar *font*)
  (defvar *mouse-x* 0)
  (defvar *mouse-y* 0)
  (defvar *zoom* 1.0)
  (defvar *program* nil)
  (defvar *program2* nil)
  
  