#version 300 es

in vec2 a_position;
void main() {
    // convert the position from pixels to 0.0 to 1.0
    vec2 scale = a_position / vec2(255.0, 255.0);
    vec2 remap = scale * 2.0;
    vec2 space = remap - 1.0;
    space.y = space.y * 0.85;
    gl_Position = vec4(space, 0,1);
}