Draw circles without using a geometry shader, layer offset broken

shader/dualTwoD/arc.vert

@@ -3,6 +3,7 @@ layout (location = 0) in vec4 pos;
 layout (location = 1) in vec4 col;
 layout (location = 2) in vec3 boxXboxYwidth;
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+layout (location = 0) uniform int layoff;
 out vec4 vCol;
 out vec3 vPos;
 out vec3 vparams;

shader/dualTwoD/basic.vert

@@ -1,6 +1,7 @@
 #version 450 core
 layout (location = 0) in vec4 pos;
 layout (location = 1) in vec4 col;
+layout (location = 0) uniform int layoff;
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 out vec4 vCol;
 out vec3 vPos;

shader/dualTwoD/ellipse.vert

@@ -1,15 +1,33 @@
 #version 450 core
-layout (location = 0) in vec4 pos;
-layout (location = 1) in vec4 col;
+struct PosCol { vec4 posx; vec4 colx; };
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
-out vec4 vCol;
-//const int ks[6] = //    
-//    {0,1,2  //  2--3    
-//    ,2,1,3  //  |  |    
-//    };      //  0--1    
-//            //          
+layout (std430, binding = 13) readonly buffer Data { PosCol data[]; };
+layout (location = 0) uniform int n;
+out vec4 gColC; // center color
+out vec4 gColE; // edge color
+out vec2 gBoundingBox;
+out vec3 gPos;
+const int ks[6] = //    
+    {1,0,2  //  2--3    
+    ,2,0,3  //  |  |    
+    };      //  1--0    
+            //          
+const vec2 bs[4] =
+    { vec2( 1, 1)
+    , vec2(-1, 1)
+    , vec2(-1,-1)
+    , vec2( 1,-1)
+    } ;
 void main()
 {
-  gl_Position = pos;
-  vCol = col;
+    int i0 = n + (3 * (gl_VertexID/6) );
+    gColC = data[i0].colx;
+    gColE = data[i0+1].colx;
+    int k = ks[gl_VertexID % 6];
+    gBoundingBox = bs[k];
+    gPos = (k > 2.5 
+            ? data[i0].posx + data[i0+2].posx - data[i0+1].posx
+            : data[i0+k].posx
+           ).xyz;
+  gl_Position = theMat * vec4(gPos,1);
 }

shader/picture/charArray.vert

@@ -1,8 +1,8 @@
 #version 450 core
 layout (location = 0) in vec4 pos;
 layout (location = 1) in vec4 inColor;
-//layout (location = 2) in vec4 inTexCoord;
 layout (location = 2) in vec3 inTexCoord;
+layout (location = 0) uniform int layoff;
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 out vec4 vColor;
 out vec3 vTexCoord;