#version 330 core

in vec3 frag_position;
in vec3 frag_normal;

uniform vec3 u_color = vec3(1,1,1);
uniform vec3 u_light_direction = vec3(1, 3, 2);

out vec4 FragColor;

void main()
{

    // Face normal
    vec3 normal = normalize(frag_normal);
    // Directional lighting
    vec3 light_direction = normalize(u_light_direction);

    float diffuse = max(dot(normal, light_direction), 0.0);

    // Ambient + diffuse
    float ambient = 0.25;
    float lighting = ambient + diffuse * 0.75;

    vec3 color = u_color * lighting;

    FragColor = vec4(color, 1.0);
}