Refactor poking tuples

shader/arc.vert

@@ -1,13 +1,13 @@
 #version 430 core
 layout (location = 0) in vec3 position;
 layout (location = 1) in vec4 color;
-layout (location = 2) in float rad;
+layout (location = 2) in vec4 saEaRadWdth;
 out vec4 vColor;
-out float vRad;
+out vec4 vparams;
 void main()
 {
   gl_Position = vec4(position,1);
   //gl_Position = vec4(0,0,0,1);
   vColor = color;
-  vRad = rad;
+  vparams = saEaRadWdth;
 }