#version 400
layout ( location = 0 ) in vec3 vertex_position;
layout ( location = 1 ) in vec3 vertex_normal;

uniform mat4 ModelViewMatrix; //view*model
uniform mat3 NormalMatrix; //transpose(inverse(model)))
uniform mat4 priv_mat; //projection*view*model

out vec3 normal;
out vec3 position;

void main()
{
  normal=normalize(NormalMatrix*vertex_normal);
  position=vec3(ModelViewMatrix*vec4(vertex_position,1.0));
  gl_Position=priv_mat*vec4(vertex_position,1.0);
}

#version 400
in vec3 normal;
in vec3 position;

uniform vec4 LightPosition; // light position: vec4(0,0,0,1);
uniform vec3 LightIntensity;

uniform vec3 Kd;            // Diffuse reflectivity
uniform vec3 Ka;            // Ambient reflectivity
uniform vec3 Ks;            // Specular reflectivity
uniform float Shininess;    // Shininess

vec3 ads( ){
    vec3 n = normal;
    vec3 s = normalize( vec3(LightPosition) - position );
    vec3 v = normalize( vec3(-position));
    vec3 r = reflect( -s, n );
return
    LightIntensity *
    ( Ka +
    Kd * max( dot(s, n), 0.0 ) +
    Ks * pow( max( dot(r,v), 0.0 ), Shininess ) );
}

void main()
{
     gl_FragColor = vec4(ads(), 1.0);
}