#version 450 core
struct CloudPosCol { vec3 pos; uint col; };
layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
layout (std430, binding = 6) readonly buffer CPos { CloudPosCol data[]; };
const vec2 indices[6] = 
    {vec2(-1,-1)  // 0    2--3
    ,vec2( 1,-1)  // 1    |  |
    ,vec2( 1, 1)  // 3    0--1
    ,vec2(-1,-1)  // 0
    ,vec2(-1, 1)  // 2
    ,vec2( 1, 1)  // 3
    };
out vec4 vCol;
out vec2 vControls;
out vec3 vPos;
void main()
{
    uint i = gl_VertexID / 6;
    uint k = gl_VertexID % 6;
    vCol = unpackUnorm4x8(data[i].col);
    vControls = indices[k];
    vPos = vec3(data[i].pos.xy + 20*vControls, data[i].pos.z);
    gl_Position = theMat * vec4(vPos,1);
}