Limit number of distortions to 10

shader/texture/barrel.vert

@@ -2,9 +2,10 @@
 struct DataS { vec2 pos; vec2 v1; vec2 v2; vec2 t1; vec2 t2; vec2 t3; };
 layout (std430, binding = 9) readonly buffer Data { DataS data[]; };
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+layout (location = 0) uniform int n;
 out vec2 texPos;
-out vec2 distmask[2];
-out vec2 pinch[2];
+out vec2 distmask[10];
+out vec2 pinch[10];
 const int ks[6] =   
     {0,1,2          //  2--3
     ,2,1,3          //  |  |
@@ -31,7 +32,7 @@ mat4 toTransMat (vec2 p)
 void main()
 {
   int k = ks[gl_VertexID];
-  for(int i = 0; i < 2; ++i)
+  for(int i = 0; i < n; ++i)
   {
   vec4 off = theMat * vec4(data[i + gl_VertexID/6].pos, 0,1);
   DataS thedata = data[i + gl_VertexID/6];