European Air War - The Gen

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/* File for "Lighting" lesson of the OpenGL tutorial on
 * www.videotutorialsrock.com
 */



#include <iostream>
#include <stdlib.h>
#include <GL/glut.h>

using namespace std;

//Called when a key is pressed
void handleKeypress(unsigned char key, int x, int y) 
{
   switch (key) 
   {
      case 27: //Escape key
         exit(0);
   }
}

//Initializes 3D rendering
void initRendering() 
{
   glEnable(GL_DEPTH_TEST);
   glEnable(GL_COLOR_MATERIAL);
   glEnable(GL_LIGHTING); //Enable lighting
   glEnable(GL_LIGHT0); //Enable light #0
   glEnable(GL_LIGHT1); //Enable light #1
   glEnable(GL_NORMALIZE); //Automatically normalize normals
   //glShadeModel(GL_SMOOTH); //Enable smooth shading
}

//Called when the window is resized
void handleResize(int w, int h) 
{
   glViewport(0, 0, w, h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(45.0, (double)w / (double)h, 1.0, 200.0);
}

float _angle = -70.0f;

//Draws the 3D scene
void drawScene() 
{
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   
   glTranslatef(0.0f, 0.0f, -8.0f);
   
   //Add ambient light
   GLfloat ambientColor[] = {0.2f, 0.2f, 0.2f, 1.0f}; //Color (0.2, 0.2, 0.2)
   glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientColor);
   
   //Add positioned light
   GLfloat lightColor0[] = {0.5f, 0.5f, 0.5f, 1.0f}; //Color (0.5, 0.5, 0.5)
   GLfloat lightPos0[] = {4.0f, 0.0f, 8.0f, 1.0f}; //Positioned at (4, 0, 8)
   glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor0);
   glLightfv(GL_LIGHT0, GL_POSITION, lightPos0);
   
   //Add directed light
   GLfloat lightColor1[] = {0.5f, 0.2f, 0.2f, 1.0f}; //Color (0.5, 0.2, 0.2)
   //Coming from the direction (-1, 0.5, 0.5)
   GLfloat lightPos1[] = {-1.0f, 0.5f, 0.5f, 0.0f};
   glLightfv(GL_LIGHT1, GL_DIFFUSE, lightColor1);
   glLightfv(GL_LIGHT1, GL_POSITION, lightPos1);
   
   glRotatef(_angle, 0.0f, 1.0f, 0.0f);
   glColor3f(1.0f, 1.0f, 0.0f);
   glBegin(GL_QUADS);
   
   //Front
   glNormal3f(0.0f, 0.0f, 1.0f);
   //glNormal3f(-1.0f, 0.0f, 1.0f);
   glVertex3f(-1.5f, -1.0f, 1.5f);
   //glNormal3f(1.0f, 0.0f, 1.0f);
   glVertex3f(1.5f, -1.0f, 1.5f);
   //glNormal3f(1.0f, 0.0f, 1.0f);
   glVertex3f(1.5f, 1.0f, 1.5f);
   //glNormal3f(-1.0f, 0.0f, 1.0f);
   glVertex3f(-1.5f, 1.0f, 1.5f);
   
   //Right
   glNormal3f(1.0f, 0.0f, 0.0f);
   //glNormal3f(1.0f, 0.0f, -1.0f);
   glVertex3f(1.5f, -1.0f, -1.5f);
   //glNormal3f(1.0f, 0.0f, -1.0f);
   glVertex3f(1.5f, 1.0f, -1.5f);
   //glNormal3f(1.0f, 0.0f, 1.0f);
   glVertex3f(1.5f, 1.0f, 1.5f);
   //glNormal3f(1.0f, 0.0f, 1.0f);
   glVertex3f(1.5f, -1.0f, 1.5f);
   
   //Back
   glNormal3f(0.0f, 0.0f, -1.0f);
   //glNormal3f(-1.0f, 0.0f, -1.0f);
   glVertex3f(-1.5f, -1.0f, -1.5f);
   //glNormal3f(-1.0f, 0.0f, -1.0f);
   glVertex3f(-1.5f, 1.0f, -1.5f);
   //glNormal3f(1.0f, 0.0f, -1.0f);
   glVertex3f(1.5f, 1.0f, -1.5f);
   //glNormal3f(1.0f, 0.0f, -1.0f);
   glVertex3f(1.5f, -1.0f, -1.5f);
   
   //Left
   glNormal3f(-1.0f, 0.0f, 0.0f);
   //glNormal3f(-1.0f, 0.0f, -1.0f);
   glVertex3f(-1.5f, -1.0f, -1.5f);
   //glNormal3f(-1.0f, 0.0f, 1.0f);
   glVertex3f(-1.5f, -1.0f, 1.5f);
   //glNormal3f(-1.0f, 0.0f, 1.0f);
   glVertex3f(-1.5f, 1.0f, 1.5f);
   //glNormal3f(-1.0f, 0.0f, -1.0f);
   glVertex3f(-1.5f, 1.0f, -1.5f);
   
   glEnd();
   
   glutSwapBuffers();
}

void update(int value) 
{
   _angle += 0.5f;
   if (_angle > 360) 
      _angle -= 360;   
   glutPostRedisplay();
   glutTimerFunc(25, update, 0);
}

int main(int argc, char** argv) 
{
   //Initialize GLUT
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_MULTISAMPLE); // does AA work ?????

   /****************************
   *      FOR A WINDOW      *
   ****************************/
   glutInitWindowSize(800, 600);
   glutCreateWindow("Lighting of cube");

   /****************************
   *      FOR FULL SCREEN      *
   ****************************/
   //glutGameModeString( "800x6000:32@60" ); //the settings for fullscreen mode
   //glutEnterGameMode(); //set glut to fullscreen using the settings in the line above
   
   initRendering();
   
   //Set handler functions
   glutDisplayFunc(drawScene);
   glutKeyboardFunc(handleKeypress);
   glutReshapeFunc(handleResize);
   
   glutTimerFunc(25, update, 0); //Add a timer
   
   glutMainLoop();
   return 0;
}