#version 430 core

out vec4 FragColor;

void main()
{
    // Normalized coordinates in [0,1]
    vec2 uv = gl_FragCoord.xy / vec2(800.0, 600.0);  // we’ll fix this later with a uniform
    vec3 color = vec3(uv.x, uv.y, 0.2);
    FragColor = vec4(color, 1.0);
}