// TP Shader
// Fabrice Aubert

varying float diffus, spec;
varying vec4 couleur_diffus;
varying vec3 N, H;

void main() 
{
  vec3  L, R;
  // Diffus
  N = normalize(gl_Normal*gl_NormalMatrix);
  L = normalize(gl_LightSource[0].position.xyz);

  diffus = max(dot(N, L), 0.0);

  // Spec
  //R = 2.0 * dot(N, L) * N - L;
  H = normalize(gl_LightSource[0].halfVector.xyz);
    
/*   spec = dot(N, H); */
/*   spec = pow(spec, gl_FrontMaterial.shininess); */
 
  couleur_diffus = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse * diffus;

/*   couleur_spec = gl_FrontMaterial.specular * gl_LightSource[0].specular * spec; */

  gl_Position = gl_ProjectionMatrix*gl_ModelViewMatrix*gl_Vertex;
  // ou gl_Position=ftransform(); 
}