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#include 

#include 

#include 

#include "glu.h"

void drawTorus(float rc, int numc, float rt, int numt)

{

    int i, j, k;

    double s, t;

    double x, y, z;

    double pi, twopi;

    pi = 3.14159265358979323846;

    twopi = 2 * pi;

    for (i = 0; i < numc; i++) {

	glBegin(GL_QUAD_STRIP);

        for (j = 0; j <= numt; j++) {

	    for (k = 1; k >= 0; k--) {

		s = (i + k) % numc + 0.5;

		t = j % numt;

		x = cos(t*twopi/numt) * cos(s*twopi/numc);

		y = sin(t*twopi/numt) * cos(s*twopi/numc);

		z = sin(s*twopi/numc);

		glNormal3f(x, y, z);

		x = (rt + rc * cos(s*twopi/numc)) * cos(t*twopi/numt);

		y = (rt + rc * cos(s*twopi/numc)) * sin(t*twopi/numt);

		z = rc * sin(s*twopi/numc);

		glVertex3f(x, y, z);

	    }

        }

	glEnd();

    }

}

static void normal3f( GLfloat x, GLfloat y, GLfloat z )

{

   GLdouble mag;

   mag = sqrt( x*x + y*y + z*z );

   if (mag>0.00001F) {

      x /= mag;

      y /= mag;

      z /= mag;

   }

   glNormal3f( x, y, z );

}

void gluPerspective( GLdouble fovy, GLdouble aspect,

		     GLdouble zNear, GLdouble zFar )

{

   GLdouble xmin, xmax, ymin, ymax;

   ymax = zNear * tan( fovy * M_PI / 360.0 );

   ymin = -ymax;

   xmin = ymin * aspect;

   xmax = ymax * aspect;

   glFrustum( xmin, xmax, ymin, ymax, zNear, zFar );

}

GLUquadricObj *gluNewQuadric(void)

{

  return NULL;

}

void gluQuadricDrawStyle(GLUquadricObj *obj, int style)

{

}

void gluCylinder( GLUquadricObj *qobj,

                  GLdouble baseRadius, GLdouble topRadius, GLdouble height,

                  GLint slices, GLint stacks )

{

   GLdouble da, r, dr, dz;

   GLfloat z, nz, nsign;

   GLint i, j;

   GLfloat du = 1.0 / slices;

   GLfloat dv = 1.0 / stacks;

   GLfloat tcx = 0.0, tcy = 0.0;

   nsign = 1.0;

   da = 2.0*M_PI / slices;

   dr = (topRadius-baseRadius) / stacks;

   dz = height / stacks;

   nz = (baseRadius-topRadius) / height;  /* Z component of normal vectors */

   for (i=0;i

	 GLfloat x1 = -sin(i*da);

	 GLfloat y1 = cos(i*da);

	 GLfloat x2 = -sin((i+1)*da);

	 GLfloat y2 = cos((i+1)*da);

	 z = 0.0;

	 r = baseRadius;

	 tcy = 0.0;

	 glBegin( GL_QUAD_STRIP );

	 for (j=0;j<=stacks;j++) {

	    if (nsign==1.0) {

	       normal3f( x1*nsign, y1*nsign, nz*nsign );

	       glTexCoord2f(tcx, tcy);

	       glVertex3f( x1*r, y1*r, z );

	       normal3f( x2*nsign, y2*nsign, nz*nsign );

	       glTexCoord2f(tcx+du, tcy);

	       glVertex3f( x2*r, y2*r, z );

	    }

	    else {

	       normal3f( x2*nsign, y2*nsign, nz*nsign );

	       glTexCoord2f(tcx, tcy);

	       glVertex3f( x2*r, y2*r, z );

	       normal3f( x1*nsign, y1*nsign, nz*nsign );

	       glTexCoord2f(tcx+du, tcy);

	       glVertex3f( x1*r, y1*r, z );

	    }

	    z += dz;

	    r += dr;

	    tcy += dv;

	 }

	 glEnd();

	 tcx += du;

      }

}

/* Disk (adapted from Mesa) */

void gluDisk( GLUquadricObj *qobj,

              GLdouble innerRadius, GLdouble outerRadius,

              GLint slices, GLint loops )

{

   GLdouble a, da;

   GLfloat dr;

   GLfloat r1, r2, dtc;

   GLint s, l;

   GLfloat sa,ca;

   /* Normal vectors */

	 glNormal3f( 0.0, 0.0, +1.0 );

   da = 2.0*M_PI / slices;

   dr = (outerRadius-innerRadius) / (GLfloat) loops;

   /* texture of a gluDisk is a cut out of the texture unit square */

   /* x, y in [-outerRadius, +outerRadius]; s, t in [0, 1] (linear mapping) */

   dtc = 2.0f * outerRadius;

   r1 = innerRadius;

   for (l=0;l

	    r2 = r1 + dr;

	       glBegin( GL_QUAD_STRIP );

	       for (s=0;s<=slices;s++) {

		  if (s==slices) a = 0.0;

		  else  a = s * da;

		  sa = sin(a); ca = cos(a);

                  glTexCoord2f(0.5+sa*r2/dtc,0.5+ca*r2/dtc);

                  glVertex2f( r2*sa, r2*ca );

                  glTexCoord2f(0.5+sa*r1/dtc,0.5+ca*r1/dtc);

                  glVertex2f( r1*sa, r1*ca );

	       }

	       glEnd();

	    r1 = r2;

	 }

}

/*

 * Sphère (adapted from Mesa)

 */

void gluSphere(GLUquadricObj *qobj,

               float radius,int slices,int stacks)

{

   float rho, drho, theta, dtheta;

   float x, y, z;

   float s, t, ds, dt;

   int i, j, imin, imax;

   int normals;

   float nsign;

   normals=1;

   nsign=1;

   drho = M_PI / (float) stacks;

   dtheta = 2.0 * M_PI / (float) slices;

  /* draw +Z end as a triangle fan */

  glBegin( GL_TRIANGLE_FAN );

  glNormal3f( 0.0, 0.0, 1.0 );

  glTexCoord2f(0.5,0.0);

  glVertex3f( 0.0, 0.0, nsign * radius );

  for (j=0;j<=slices;j++) {

	 theta = (j==slices) ? 0.0 : j * dtheta;

	 x = -sin(theta) * sin(drho);

	 y = cos(theta) * sin(drho);

	 z = nsign * cos(drho);

	 if (normals)  glNormal3f( x*nsign, y*nsign, z*nsign );

	 glVertex3f( x*radius, y*radius, z*radius );

      }

   glEnd();

      ds = 1.0 / slices;

      dt = 1.0 / stacks;

      t = 1.0;  /* because loop now runs from 0 */

      if (1) {

        imin = 0;

        imax = stacks;

      }

      else {

        imin = 1;

        imax = stacks-1;

      }

      /* draw intermediate stacks as quad strips */

      for (i=imin;i

	 rho = i * drho;

	 glBegin( GL_QUAD_STRIP );

         s = 0.0;

	 for (j=0;j<=slices;j++) {

	    theta = (j==slices) ? 0.0 : j * dtheta;

	    x = -sin(theta) * sin(rho);

	    y = cos(theta) * sin(rho);

	    z = nsign * cos(rho);

	    if (normals)  glNormal3f( x*nsign, y*nsign, z*nsign );

	    glTexCoord2f(s,1-t);

	    glVertex3f( x*radius, y*radius, z*radius );

	    x = -sin(theta) * sin(rho+drho);

	    y = cos(theta) * sin(rho+drho);

	    z = nsign * cos(rho+drho);

	    if (normals)  glNormal3f( x*nsign, y*nsign, z*nsign );

	    glTexCoord2f(s,1-(t-dt));

            s += ds;

	    glVertex3f( x*radius, y*radius, z*radius );

	 }

	 glEnd();

	 t -= dt;

      }

/* draw -Z end as a triangle fan */

    glBegin( GL_TRIANGLE_FAN );

    glNormal3f( 0.0, 0.0, -1.0 );

      glTexCoord2f(0.5,1.0);

      glVertex3f( 0.0, 0.0, -radius*nsign );

      rho = M_PI - drho;

      s = 1.0;

      t = dt;

      for (j=slices;j>=0;j--) {

	 theta = (j==slices) ? 0.0 : j * dtheta;

	 x = -sin(theta) * sin(rho);

	 y = cos(theta) * sin(rho);

	 z = nsign * cos(rho);

	 if (normals)  glNormal3f( x*nsign, y*nsign, z*nsign );

	 glTexCoord2f(s,1-t);

         s -= ds;

	 glVertex3f( x*radius, y*radius, z*radius );

      }

      glEnd();

}