#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] = {0,1,2,2,3,0};
vec4 iface[6] = 
    { vec4 (-1,-1,0,1)
    , vec4 (-1,1,0,1)
    , vec4 (1,1,0,1)
    , vec4 (1,1,0,1)
    , vec4 (1,-1,0,1)
    , vec4 (-1,-1,0,1)
    };
void main()
{
    //const struct PosCol pc = data[gl_VertexID / 6];
    vec4 pp = data[gl_VertexID / 6].pospos;
    vCol = data[gl_VertexID / 6].col;
    //vCol = vec4(1,0.5,0,0.5);
    int j = indices[gl_VertexID % 6];
    float z = (j / 2 > 0 ? 5000 : 0);
    //vec2 xy = (j % 2 > 0 ? pc.pospos.xy : pc.pospos.zw);
    vec2 xy = (j % 2 > 0 ? pp.xy : pp.zw);
    vPos = vec4( xy, z, 1);
//    vPos = vec4( 0,0,0, 1);
    //vCol = pc.col; 
    gl_Position = theMat * vPos;
    //gl_Position = iface[gl_VertexID % 6];
}