#version 400
in vec3 vNormal;
in vec3 vWorldPos;

uniform vec4 u_color;
uniform vec3 u_lightDir;

out vec4 fragColor;

void main()
{
    vec3 n = normalize(vNormal);
    vec3 l = normalize(u_lightDir);
    float diff = max(dot(n, l), 0.0);
    float ambient = 0.55;
    float light = clamp(ambient + diff * 0.45, 0.0, 1.0);
    fragColor = vec4(u_color.rgb * light, u_color.a);
}