#version 440

layout( location = 0 ) in vec4 vertexCoord;
layout( location = 0 ) out vec2 coord;

layout( std140, binding = 0 ) uniform buf
{
    mat4 matrix;
    vec2 centerCoord;
    float aspectRatio;
    float start;
    float span;
    float opacity;
} ubuf;

out gl_PerVertex { vec4 gl_Position; };

void main()
{
    coord = vertexCoord.xy - ubuf.centerCoord;
    coord.y *= ubuf.aspectRatio;

    gl_Position = ubuf.matrix * vertexCoord;
}