/* network1.c
/*    An example of a static networked CAVE environment. The world is that
/*  of navigate1.c, except that the balls do not bounce (as that would
/*  require synchronization of the different CAVEs). This program does not
/*  use any networked application data; it merely uses the networked
/*  tracking data in drawing the remote users.
*/

#include <cave_ogl.h>
#include <GL/glu.h>

void init_gl(void),draw_world(void);
void navigate(void);
void draw_user(volatile CAVE_USER_ST *user);
void draw_head(volatile CAVE_USER_ST *user);
void draw_wand(volatile CAVE_USER_ST *user);

main(int argc,char **argv)
{
 CAVEConfigure(&argc,argv,NULL);
 CAVEInit();
 CAVEInitApplication(init_gl,0);
 CAVEDisplay(draw_world,0);
 while (!CAVEgetbutton(CAVE_ESCKEY))
	{
	navigate();
	sginap(1);
	}
 CAVEExit();
}


#define SPEED 5.0f  /* Max navigation speed in feet per second */

/* navigate - perform the navigation calculations. This checks the joystick
  state and uses that to move and rotate. The Y position of the joystick
  determines the speed of motion in the direction of the wand. The X position
  of the joystick determines the speed of rotation about the CAVE's Y axis.
  Joystick values in the range -.2 to .2 are ignored; this provides a dead
  zone to eliminate noise. The motion is scaled by dt, the time passed since
  the last call to navigate(), in order to maintain a smooth speed. */
void navigate(void)
{
 float jx=CAVE_JOYSTICK_X,jy=CAVE_JOYSTICK_Y,dt,t;
 static float prevtime = 0;
 t = CAVEGetTime();
 dt = t - prevtime;
 prevtime = t;
 if (fabs(jy)>0.2)
	{
	float wandFront[3];
	CAVEGetVector(CAVE_WAND_FRONT,wandFront);
	CAVENavTranslate(wandFront[0]*jy*SPEED*dt, wandFront[1]*jy*SPEED*dt,
			wandFront[2]*jy*SPEED*dt);
	}
 if (fabs(jx)>0.2)
	CAVENavRot(-jx*90.0f*dt,'y');
}



static GLuint greenMat, blueMat; 
static GLUquadricObj *sphereObj;

/* init_gl - initialize GL lighting & materials */
void init_gl(void)
{
 float greenMaterial[] = { 0, 1, 0, 1 };
 float blueMaterial[] = { 0, 0, 1, 1 };
 glEnable(GL_LIGHT0);
 greenMat = glGenLists(1);
 glNewList(greenMat, GL_COMPILE);
 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, greenMaterial);
 glEndList();
 blueMat = glGenLists(1);
 glNewList(blueMat, GL_COMPILE);
 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blueMaterial);
 glEndList();
 sphereObj = gluNewQuadric();
}


/* draw_world - draw the world - the two balls, and the networked users */
void draw_world(void)
{
 int i;

 glClearColor(0., 0., 0., 0.);
 glClear(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT);

/* Apply the navigation transformation */
 glPushMatrix();
 CAVENavTransform();

 glColor3f(.03, .5, .1);
 glBegin(GL_QUADS);
  glVertex3f(-100.0, 0.0, -100.0);
  glVertex3f(100.0, 0.0, -100.0);
  glVertex3f(100.0, 0.0, 100.0);
  glVertex3f(-100.0, 0.0, 100.0);
 glEnd();

 glEnable(GL_LIGHTING);

 glCallList(greenMat);
 glPushMatrix();
 glTranslatef(2.0, 3.0, -5.0);
 gluSphere(sphereObj, 1.0, 8, 8);
 glPopMatrix();

 glCallList(blueMat);
 glPushMatrix();
 glTranslatef(-2.0, 1.0, -5.0);
 gluSphere(sphereObj, 1.0, 8, 8);
 glPopMatrix();

 glDisable(GL_LIGHTING);

/* Draw all the remote users (but not the local user; hence count from 1) */
 glPopMatrix();
 for (i=1; i<*CAVENumUsers; i++)
	draw_user(CAVEUser[i]);
}

/* draw_user - draw the given user's head and wand */
/*   note that this is performed in tracker, not navigated, coordinates */
void draw_user(volatile CAVE_USER_ST *user)
{
 glPushMatrix();
  CAVESensorTransform(CAVENETSENSOR(user,0));
  draw_head(user);
 glPopMatrix();
 glPushMatrix();
  CAVESensorTransform(CAVENETSENSOR(user,1));
  draw_wand(user);
 glPopMatrix();
}

/* draw_head - draw the given user's head, using a few spheres for a
	head, eyes, and nose */
void draw_head(volatile CAVE_USER_ST *user)
{
 glColor3f(.5, .5, .5);
 gluSphere(sphereObj, 0.5, 8, 8);

 glColor3f(.75, .0, .0);
 glPushMatrix();
 glTranslatef(0.0, 0.1, -.5);
 gluSphere(sphereObj, 0.1, 5, 5);
 glPopMatrix();

 glColor3f(.0, .0, .75);
 glPushMatrix();
 glTranslatef(-0.2, 0.3, -.3);
 gluSphere(sphereObj, 0.1, 5, 5);
 glPopMatrix();
 glPushMatrix();
 glTranslatef(0.2, 0.3, -.3);
 gluSphere(sphereObj, 0.1, 5, 5);
 glPopMatrix();
}

/* draw_wand - draw the given user's wand as a small sphere */
void draw_wand(volatile CAVE_USER_ST *user)
{
 glColor3f(1.0, .0, .0);
 gluSphere(sphereObj, 0.1, 5, 5);
}