#version 430 core

in VS_OUT {
  vec4 Texture;
} fs_in;

layout (location = 0) out vec4 Color;

layout (r16i, binding = 0) readonly uniform iimageBuffer Image;

float get_sample(int coordinate)
{
  int red = imageLoad(Image, coordinate).r;
  return float(red) * (1.0 / 32768.0);
}

void main()
{
  float value = get_sample(int(gl_FragCoord.x));

  float y = -(fs_in.Texture.y * 2 - 1);

  float c = float(abs(y) < abs(value));

  Color = vec4(c, 0, 0, 1);
}