#version 450 core
struct PosCol { vec4 pospos; vec4 col; };
layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
layout (std430, binding = 1) readonly buffer Pos { PosCol data[]; };
out vec4 vCol;
out vec4 vPos;
int indices[6] = {0,1,3,0,3,2};
void main()
{
    vCol = data[gl_VertexID / 6].col;
    vec4 pp = data[gl_VertexID / 6].pospos;
    int j = indices[gl_VertexID % 6];
    float z = (j > 1.5 ? 5000 : 0);
    vec2 xy = (j % 2 > 0 ? pp.xy : pp.zw);
    vPos = vec4( xy, z, 1);
    gl_Position = theMat * vPos;
}