#version 330 core

out vec4 color;

in vec3 position_pass;
in vec3 camera_position_pass;
in vec3 normal_pass;
in vec2 uv_pass;

float min_brightness = 0.05;
vec3 sun_position = vec3(1000.0, 1000.0, 1000.0);

float shine_dampener = 10;
float reflectivity = 5;

uniform sampler2D sampler;

void main() {
  color = texture(sampler, uv_pass);

  vec3 to_sun_vector = normalize(sun_position - position_pass);

  float intensity = clamp(dot(to_sun_vector, normal_pass), 0.25, 1.0);
  color.xyz *= intensity;

  //vec3 to_camera_vector = normalize(camera_position_pass - position_pass);
  //vec3 reflection = reflect(-to_sun_vector, normal_pass);
  
  //float specular_intensity = max(dot(to_camera_vector, reflection), 0.0);

  //specular_intensity = pow(specular_intensity, shine_dampener);

  //specular_intensity *= reflectivity;

  //if (dot(normal_pass, to_camera_vector) >= 0.3)
    //color.xyz += vec3(1.0, 1.0, 1.0) * specular_intensity;
}