// Phong fragment shader
varying vec3 oglnormal;   // input from vertex shader
varying vec3 oglcolor;    // input from vertex shader
varying vec3 ogllight0;   // OpenGL light directions...
varying vec3 ogllight1;    

void main(void) {
  float diffuse = 0.0;
  float specular = 0.0;
  vec3 N = normalize(oglnormal);

  // calculate diffuse lighting contribution
  diffuse += max(0.0, dot(N, ogllight0));
// XXX If I do more than one light, I run the card out of resources and
//     the shader fails to load
//  diffuse += max(0.0, dot(N, ogllight1));
  diffuse = clamp(diffuse, 0.0, 1.0);
  diffuse *= 0.60;

  // calculate specular lighting contribution
  vec3 V = vec3(0.0, 0.0, -1.0);
  specular += pow(clamp(dot(reflect(ogllight0, N), V), 0.0, 1.0), 10.0);
// XXX If I do more than one light, I run the card out of resources and
//     the shader fails to load
//  specular += pow(clamp(dot(reflect(ogllight1, N), V), 0.0, 1.0), 10.0);
  specular = clamp(specular, 0.0, 1.0);
  specular *= 0.40; 

  gl_FragColor = vec4((oglcolor * vec3(diffuse)) + vec3(specular), 1.0);
}