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#include <GL/glut.h>    // Header File For The GLUT Library
#include <GL/gl.h>      // Header File For The OpenGL32 Library
#include <GL/glu.h>     // Header File For The GLu32 Library
#include <iostream>  

#include <unistd.h>
#include <fcntl.h>
#include <signal.h>

#include "adjust.hh"
#include "live.hh"

using namespace std;

#define IMG_WIDTH 	360
#define IMG_HEIGHT 	296
#define WIDTH  718
#define HEIGHT 592
int window;
Live *live;
int width=538; int height=395;
static const unsigned nbImg = 4;

/// Chargement d'une texture a partir de donnees RGB
unsigned int 
loadImage(int width, int height, unsigned char *data, unsigned int lastTex) 
{
    GLuint tex;
    if (glIsTexture(lastTex)) glDeleteTextures(1, &lastTex);
    // Mode de chargement des donnees
    glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
    // Creer une id pour stocker l'image
    glGenTextures(1, &tex);
    glBindTexture(GL_TEXTURE_2D, tex);
    // Stocke l'image
    //glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3, width, height, GL_RGB, GL_UNSIGNED_BYTE, data);
    // Config des parametres
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    // Retourne l'id de l'image
    return tex;
}

/// Initialisation des fonctions OpenGL
void 
initGL(int width, int height)	       
{
    // Initialisation du mode d'affichage
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);	
    // Mode de chargement des donnees
    glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
    glShadeModel(GL_FLAT);	
    glEnable(GL_TEXTURE_2D);
    // Remise a zero de la matrice de projection
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();		
    // Plan de projection en 2D
    glOrtho(0.0, WIDTH, 0.0, HEIGHT, -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);
}



/// Redimenssionement d'une fenetre
void
reSizeGLScene(int w, int h)
{
    // Evite div par 0
    if (height==0) h=1;
    height = h;
    width = w;
    // Initialise le point de vue  
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    // Remise a zero et mode 2D
    glLoadIdentity();
    glOrtho(0.0, WIDTH, 0.0, HEIGHT, -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);
}


/// Affiche une image
/// @param texId numero de la texture a afficher
void
drawImage(GLuint texId) 
{
    int wMin, wMax;
    int hMin, hMax;
    // Selection de l'image
    glBindTexture(GL_TEXTURE_2D, live->tex[texId]);
    // Calcul des coordonnees de l'image
    wMin = BORDER+(texId%3)*(352+BORDER);
    wMax = 352+BORDER+(texId%3)*(352+BORDER);
    hMin = HEIGHT-288-BORDER-(int)(texId/3)*(288+BORDER);
    hMax = HEIGHT-BORDER-(int)(texId/3)*(288+BORDER);
    // Dessine un carre contenant l'image	
    glBegin(GL_QUADS);
    	glNormal3f( 0.0f, 0.0f, 1.0f);
	glColor3f(1.0f,1.0f,1.0f);
	glTexCoord2f(0.0f, 0.0f); glVertex3f(wMax, hMax, -1.0f);
	glTexCoord2f(1.0f, 0.0f); glVertex3f(wMin, hMax, -1.0f);
	glTexCoord2f(1.0f, 1.0f); glVertex3f(wMin, hMin, -1.0f);
	glTexCoord2f(0.0f, 1.0f); glVertex3f(wMax, hMin, -1.0f);
    glEnd();
}


/// Dessine les images a l'ecran
void 
drawGLScene()
{
    // Efface le buffer
    glClear(GL_COLOR_BUFFER_BIT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    // Affiche toutes les images
    for (unsigned i=0; i<nbImg; i++)
	drawImage(i);
    glFlush();
    // Affiche le buffer suivant
    glutSwapBuffers();
}


/// Interruptions du clavier
void 
keyPressed(unsigned char key, int x, int y) 
{
    // Touche Echap
    if (key == 27) 
      {
	glutDestroyWindow(window); 
	exit (0);                  
      }
    if (key == ' ')
      {
	live->updateImg ("shots/quille1.rgb");
	drawGLScene ();
      }
    if (key == 'r')
	live->reloadConfig ("rc/vision.conf");
}

/// Gestion souris
void
mouseFunc(int button, int state, int x, int y)
{
}

/// Fonction principale
int
main(int argc, char **argv) 
{
    // Initialisation de l'OpenGL    
    glutInit(&argc, argv);  
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);  
    glutInitWindowSize(width, height);  
    glutInitWindowPosition(0, 0);  
    window = glutCreateWindow("liveCam - APBteam");  
    glutDisplayFunc(&drawGLScene);  
    glutReshapeFunc(&reSizeGLScene);
    glutKeyboardFunc(&keyPressed);
    glutMouseFunc(&mouseFunc);
    initGL(WIDTH, HEIGHT);

    live = new Live (nbImg);
    live->init ("shots/test.rgb");

    // Boucle principale  
    glutMainLoop(); 

    return 1;
}