R"raw_string(
#version 120

varying vec3 vertex;
varying vec3 normal;

uniform vec3 color;
varying vec3 lightvec;

void main()
{
  //gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
  //gl_FragColor = vec4(0.5+0.5*vertex.xyz, 1.0);


  vec3 Eye       = normalize(-vertex);
  vec3 Reflected = normalize(reflect( -lightvec, normal));

//todo materials (& light color)
  vec4 IAmbient  = vec4(0.2f, 0.2f, 0.2f, 1.0f);
  vec4 IDiffuse  = vec4(1.0f, 1.0f, 1.0f, 0.0f) * max(dot(normal, lightvec), 0.0);
  //todo shininess
  vec4 ISpecular = vec4(1.0f, 0.0f, 0.0f, 0.0f) * pow(max(dot(Reflected, Eye), 0.0), 3);

  gl_FragColor   = vec4((IAmbient + IDiffuse) + ISpecular);
  //gl_FragColor = vec4(0.5+0.5*normal, 1.0);
}
)raw_string"