#version 450 core
struct DataS { vec2 pos; vec2 rad1; vec2 rad2; };
layout (std430, binding = 9) readonly buffer Data { DataS data[]; };
layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
out vec2 texPos;
out vec2 distmask;
const int ks[6] =   
    {0,1,2          //  2--3
    ,2,1,3          //  |  |
    };              //  0--1
const vec2 cs[4] =
    { vec2 (-1,-1)
    , vec2 ( 1,-1)
    , vec2 (-1, 1)
    , vec2 ( 1, 1)
    };
void main()
{
  int k = ks[gl_VertexID];
  vec4 off = (theMat * vec4(data[gl_VertexID/6].pos, 0,1));
  float r = distance
        ((theMat * vec4(data[gl_VertexID/6].rad1, 0,1)).xy
        ,(theMat * vec4(0,0, 0,1)).xy);
  distmask = (cs[k] - off.xy)/r;
  texPos = 0.5 * (cs[k]+vec2(1,1));
  gl_Position = vec4 (cs[k],0,1);
}