#version 460 core

in vec3 fNormal;
in vec2 fTextureCoordinates;
in vec3 fColor;

layout(location = 3) uniform sampler2D sampler;

out vec4 color;

const vec3 lightDirection = normalize(vec3(0.0f, 0.0f, -1.0f));

void main() {
    vec3 sampleColor = texture(sampler, fTextureCoordinates).rgb;
    float intensity = clamp(dot(lightDirection, -normalize(fNormal)), 0.0f, 1.0f);
    color = vec4(intensity * sampleColor * fColor + vec3(0.15f, 0.15f, 0.15f), 1.0f);
}