#version 410

layout(location = 2) in vec3 pos;

uniform float near;
uniform float far;

void main()
{
    float z = gl_FragCoord.z;
    //convert to linear values
    //formula can be found at www.roxlu.com/2014/036/rendering-the-depth-buffer
    float c = (2.0 * near) / (far + near - z * (far - near));
    gl_FragDepth = c;
}