title: Problems with flat and phong shading
body: <p>(Edit): The original code I posted was for both gouraud and phong shading options. I've changed it so it is just phong shading and posted below. The mesh is too big to describe here, as it is generated from a Bezier Patch.</p>
  
  <p>I'm having some problems with flat and phong shading in Open GL 3 Mesa 9. It seems no matter what I do I get flat shaded figures, with tiny facets (planes) and I cannot get Blinn-Phong shading to work. </p>
  
  <p>Here are my shaders:</p>
  
  <p>(Vertex Shader)</p>
  
  <pre><code>//material parameters
  
  uniform vec4 AmbientProduct, DiffuseProduct, SpecularProduct;
  uniform float Shininess;
  
  
  attribute vec4 vPosition;
  //attribute vec4 vColor;
  attribute vec4 vNormal;
  attribute vec4 vControlColor;
  attribute vec2 texcoord;
  
  
  uniform mat4 model_view;
  uniform mat4 projection;
  
  uniform int flag;
  uniform int phong_flag;
  uniform vec4 eye_position;
  
  //lighting parameters
  uniform vec4 light_1;               //light 1 position         
  uniform vec4 light_2;               //light 2 position
  
  
  
  varying vec4 control_color;
  varying vec4 color;
  varying vec4 position;
  varying vec4 normal;
  
  varying vec2 st;
  
  void
  main()
  {
  
      control_color = vControlColor;
      position = vPosition;
      normal = vNormal;
      tex_coords = texcoord;
      st = texcoord;
      gl_Position = projection*model_view*vPosition;
  
  }
  </code></pre>
  
  <p>And my fragment shader:</p>
  
  <pre><code>//material parameters
  
  uniform vec4 AmbientProduct, DiffuseProduct, SpecularProduct;
  uniform float Shininess;
  uniform vec4 eye_position;
  
  uniform int phong_flag;
  
  
  //lighting parameters
  uniform vec4 light_1;               //light 1 position         
  uniform vec4 light_2;               //light 2 position
  varying vec4 light_2_transformed;   //light 2 transformed position
  uniform int Control_Point_Flag;
  uniform sampler2D texMap;
  
  varying vec4 color;
  varying vec4 position;
  varying vec4 normal;
  varying vec4 control_color;
  
  varying vec2 st;
  
  void
  main()
  {
  
          vec4 N = normalize(normal);
          vec4 E = normalize(eye_position - position);
          vec4 L1 = normalize(light_1 - position);
          vec4 L2 = normalize(light_2 - position);
          vec4 H1 = normalize( L1 + E);
          vec4 H2 = normalize( L2 + E);
  
          //calculate ambient component
          vec4 ambient = AmbientProduct;
  
  
          //calculate diffuse componenent
          float k_d_1 = max(dot(L1,N), 0.0);
          float k_d_2 = max(dot(L2,N), 0.0);
          vec4 diffuse1 = k_d_1*DiffuseProduct;
          vec4 diffuse2 = k_d_2*DiffuseProduct;
  
          //calculate specular componenent
          float k_s_1 = pow(max(dot(N, H1), 0.0), Shininess);
          float k_s_2 = pow(max(dot(N, H2), 0.0), Shininess);
          vec4 specular1 = k_s_1*SpecularProduct;
          vec4 specular2 = k_s_2*SpecularProduct;   
  
          //if specular color is behind the camera, discard it
          if (dot(L1, N) &lt; 0.0) {
              specular1 = vec4(0.0, 0.0, 0.0, 1.0);
          }
          if (dot(L2, N) &lt; 0.0) {
              specular2 = vec4(0.0, 0.0, 0.0, 1.0);
          }
  
  
          vec4 final_color = ambient + diffuse1 + diffuse2 + specular1 + specular2;
  
          final_color.a = 1.0;
  
          /* gl_FragColor = final_color; */
          gl_FragColor = final_color*texture2D(texMap, st);
  
  }
  </code></pre>
  
  <p>Does everything look ok for my shaders?</p>