glViewport(0, 0, 640, 480);
  
    glEnable(GL_TEXTURE_2D);          // Enable Texture Mapping

  // set up light number 1.
    glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);  // add lighting. (ambient)
    glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);  // add lighting. (diffuse).
    glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); // set light position.
    glEnable(GL_LIGHT1);

    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);     // This Will Clear The Background Color To Black
    glClearDepth(1.0);                // Enables Clearing Of The Depth Buffer
    glDepthFunc(GL_LESS);             // The Type Of Depth Test To Do
    glEnable(GL_DEPTH_TEST);          // Enables Depth Testing
    glShadeModel(GL_SMOOTH);          // Enables Smooth Color Shading
    glDisable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); //To allow transparent textures

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();             // Reset The Projection Matrix

    gluPerspective(45.0f,(GLfloat)640/(GLfloat)480,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
     glMatrixMode(GL_MODELVIEW);