Work towards doing transformations using uniforms

shader/wallShadow.vert

@@ -4,6 +4,11 @@ layout (location = 1) in vec4 backPoss;
 
 out vec4 vBackPoss;
 
+uniform vec2 winSize;
+uniform float zoom;
+uniform float rotation;
+uniform vec2 translation;
+
 void main()
 {
   gl_Position = poss;