vetex shader

#version 150

in vec3 position;

uniform float height;
uniform float aspect = 4.0/3.0;
uniform float zNear;
uniform float zFar;

mat4 camera = mat4(
    vec4(1.0/(height*aspect),        0.0,                0.0, 0.0),
    vec4(                0.0, 1.0/height,                0.0, 0.0),
    vec4(                0.0,        0.0, 2.0/(zFar - zNear), 0.0),
    vec4(                0.0,        0.0,         -zNear - 1, 1.0)
);

void main () {
    gl_Position = camera * vec4(position, 1.0);
}