/* Auteur: Nicolas JANEY         */
/* nicolas.janey@univ-fcomte.fr  */
/* Mars 2003                     */
/* Le blending                   */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>

#include "ModuleCouleurs.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"
#include "ModuleReshape.h"
#include "ModuleFont.h"

static float angle = 0.0F ;
static float da = 1.0F;
static float alpha = 0.5F ;
static int f1;
static int f2;
static int obj = 0;
static int cull = 1;

void myinit(void) {
  glClearColor(0.5F,0.5F,0.5F,1.0F);
  GLfloat light_position0[] = { 1.0F,1.0F,1.0F,0.0F };
  glLightfv(GL_LIGHT0,GL_AMBIENT,couleurNoir());
  glLightfv(GL_LIGHT0,GL_DIFFUSE,couleurBlanc());
  glLightfv(GL_LIGHT0,GL_SPECULAR,couleurBlanc());
  glLightfv(GL_LIGHT0,GL_POSITION,light_position0);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_AUTO_NORMAL);
  glEnable(GL_NORMALIZE);
  glEnable(GL_DEPTH_TEST);
  glDepthFunc(GL_LESS);
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_CULL_FACE);
}

void objet(void) {
  glRotatef(angle*1.1F,0.0F,1.0F,0.0F);
  switch(obj) {
    case 0 : glFrontFace(GL_CCW);
             glutSolidSphere(4.5,60,60);
             break;
    case 1 : glFrontFace(GL_CCW);
             glutSolidTorus(2.3,3.0,60,120);
             break;
    case 2 : glFrontFace(GL_CW);
             glutSolidTeapot(4.5);
             break; }
}

void display(void) {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  if ( cull )
    glEnable(GL_CULL_FACE);
    else
    glDisable(GL_CULL_FACE);
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glRotatef(angle,0.0F,1.0F,0.0F);
  glPushMatrix();
  glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,couleurRouge(1.0)) ;
  glTranslatef(4.0F,0.0F,0.0F);
  objet();
  glPopMatrix();
  glPushMatrix();
  glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,couleurVert(alpha)) ;
  glTranslatef(-5.0F,0.0F,0.0F);
  objet();
  glPopMatrix();
  glPopMatrix();
  glFlush();
  glutSwapBuffers() ;
}

void postRedisplay(void) {
  glutPostWindowRedisplay(f1);
  glutPostWindowRedisplay(f2);
}

void idle(void) {
  angle += da;
  postRedisplay();
}

void key(unsigned char key,int x,int y) {
  static int anim = 1;
  if ( keyManipulateur(key,x,y) )
    glutPostRedisplay();
    else
    switch ( key ) {
      case 'a'  : da *= 1.1F;
                  break;
      case 'A'  : da /= 1.1F;
                  break;
      case 'c'  : cull = !cull;
                  postRedisplay();
                  break;
      case 0x0D : obj =(obj+1) % 3;
                  postRedisplay();
                  break;
      case ' '  : anim = !anim;
                  glutIdleFunc((anim) ? idle : NULL);
                  break;
      case 45   : alpha -= 0.05F;
                  if ( alpha < 0.0F )
                    alpha = 0.0F;
                  postRedisplay();
                  break;
      case 43   : alpha += 0.05F;
                  if ( alpha > 1.0F )
                    alpha = 1.0F;
                  postRedisplay();
                  break; }
}

void reshape2(int w,int h) {
  glViewport(0,0,w,h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(0,w,-h,0,-1.0,1.0); 
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void display2() {
  glClear(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT);
  glPushMatrix();
  float pos = 1.0F;
  glColor4fv(couleurBlanc());
  placeFontCursor(5.0F,-pos*20.0F,0.0F) ;
  simpleBitmapOutput(1,REGULAR8x13,"alpha : %6.3f",alpha) ;
  pos += 1.0F;
  glPopMatrix();
  glutSwapBuffers();
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(360,200); 
  glutInitWindowPosition(50,50); 
  f1 = glutCreateWindow("Le blending"); 
  myinit();
  creationMenuBasique();
  setParametresOrthoBasique(-6.0,6.0,-6.0,6.0,-50.0,50.0);
  setManipulateurDistance(1.0F);
  glutReshapeFunc(reshapeOrthoBasique);
  glutIdleFunc(idle);
  glutKeyboardFunc(key);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutDisplayFunc(display);
  glutInitWindowSize(150,30);
  glutInitWindowPosition(60,340);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  f2 = glutCreateWindow("Valeurs");
  creationMenuBasique();
  glutDisplayFunc(display2);
  glutReshapeFunc(reshape2);
  glutKeyboardFunc(key);
  glutSpecialFunc(specialBasique);
  glutMainLoop();
  return(0);
}