DGlut

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{ DGLUT.PAS }

 

{ Bob Crawford

F.L.A.S.K.

June, 1997 }

 

{ DGLUT is an Object Pascal translation of a small part of Mark Kilgard's

GLUT library for OpenGL. Included here are just the shape-drawing routines

from glut_shapes.c and the teapot routines from glut_teapot.c. Following

is the original copyright notices from those files. }

 

{ Copyright (c) Mark J. Kilgard, 1994.

 

/**

(c) Copyright 1993, Silicon Graphics, Inc.

 

ALL RIGHTS RESERVED

 

Permission to use, copy, modify, and distribute this software

for any purpose and without fee is hereby granted, provided

that the above copyright notice appear in all copies and that

both the copyright notice and this permission notice appear in

supporting documentation, and that the name of Silicon

Graphics, Inc. not be used in advertising or publicity

pertaining to distribution of the software without specific,

written prior permission.

 

THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU

"AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR

OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  IN NO

EVENT SHALL SILICON GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE

ELSE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR

CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER,

INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSS OF USE,

SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD PARTIES, WHETHER OR

NOT SILICON GRAPHICS, INC.  HAS BEEN ADVISED OF THE POSSIBILITY

OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE OR

PERFORMANCE OF THIS SOFTWARE.

 

US Government Users Restricted Rights

 

Use, duplication, or disclosure by the Government is subject to

restrictions set forth in FAR 52.227.19(c)(2) or subparagraph

(c)(1)(ii) of the Rights in Technical Data and Computer

Software clause at DFARS 252.227-7013 and/or in similar or

successor clauses in the FAR or the DOD or NASA FAR

Supplement.  Unpublished-- rights reserved under the copyright

laws of the United States.  Contractor/manufacturer is Silicon

Graphics, Inc., 2011 N.  Shoreline Blvd., Mountain View, CA

94039-7311.

 

OpenGL(TM) is a trademark of Silicon Graphics, Inc.

}

 

unit DGlut;

 

interface

 

uses

OpenGL;

 

type

TGLfloat3v =

  array[0..2] of GLfloat;

TInteger3v =

  array[0..2] of Integer;

 

const

BoxPoints :

  Array[0..5, 0..2] of GLfloat =

    ( (-1,  0,  0),

      ( 0,  1,  0),

      ( 1,  0,  0),

      ( 0, -1,  0),

      ( 0,  0,  1),

      ( 0,  0, -1) );

 

BoxFaces :

  Array[0..5, 0..3] of GLint =

    ( (0, 1, 2, 3),

      (3, 2, 6, 7),

      (7, 6, 5, 4),

      (4, 5, 1, 0),

      (5, 6, 2, 1),

      (7, 4, 0, 3) );

 

{ Octahedron data:

    The octahedron produced is centered at the origin and has radius 1.0 }

OctData :

  Array[0..5] of TGLfloat3v =

    ( (1.0, 0.0, 0.0),

      (-1.0, 0.0, 0.0),

      (0.0, 1.0, 0.0),

      (0.0, -1.0, 0.0),

      (0.0, 0.0, 1.0),

      (0.0, 0.0, -1.0) );

 

OctIndex :

  Array[0..7] of TInteger3v =

    (  (0, 4, 2),

       (1, 2, 4),

       (0, 3, 4),

       (1, 4, 3),

       (0, 2, 5),

       (1, 5, 2),

       (0, 5, 3),

       (1, 3, 5) );

 

{ Icosahedron data:

    These numbers are rigged to make an icosahedron of radius 1.0 }

 

IcoX = 0.525731112119133606;

IcoZ = 0.850650808352039932;

 

IcoData :

  Array[0..11] of TGLfloat3v =

    ( (-IcoX,     0,  IcoZ),

      ( IcoX,     0,  IcoZ),

      (-IcoX,     0, -IcoZ),

      ( IcoX,     0, -IcoZ),

      (    0,  IcoZ,  IcoX),

      (    0,  IcoZ, -IcoX),

      (    0, -IcoZ,  IcoX),

      (    0, -IcoZ, -IcoX),

      ( IcoZ,  IcoX,     0),

      (-IcoZ,  IcoX,     0),

      ( IcoZ, -IcoX,     0),

      (-IcoZ, -IcoX,     0) );

 

IcoIndex :

  Array[0..19] of TInteger3v =

    ( (0, 4, 1),

      (0, 9, 4),

      (9, 5, 4),

      (4, 5, 8),

      (4, 8, 1),

      (8, 10, 1),

      (8, 3, 10),

      (5, 3, 8),

      (5, 2, 3),

      (2, 7, 3),

      (7, 10, 3),

      (7, 6, 10),

      (7, 11, 6),

      (11, 0, 6),

      (0, 1, 6),

      (6, 1, 10),

      (9, 0, 11),

      (9, 11, 2),

      (9, 2, 5),

      (7, 2, 11) );

 

{ Tetrahedron data }

 

TetT = 1.73205080756887729;

 

TetData :

  Array[0..3] of TGLfloat3v =

    ( ( TetT,  TetT,  TetT),

      ( TetT, -TetT, -TetT),

      (-TetT,  TetT, -TetT),

      (-TetT, -TetT,  TetT) );

 

TetIndex :

  Array[0..3] of TInteger3v =

    (  (0, 1, 3),

       (2, 1, 0),

       (3, 2, 0),

       (1, 2, 3)  );

 

{ Teapot stuff }

 

{ Rim, body, lid, and bottom data must be reflected in x

 and y; handle and spout data across the y axis only. }

 

PatchData :

  Array[0..9, 0..15] of GLint =

  (

    { Rim }

    (102, 103, 104, 105,   4,   5,   6,   7,

       8,   9,  10,  11,  12,  13,  14,  15),

    { Body }

    ( 12,  13,  14,  15,  16,  17,  18,  19,

      20,  21,  22,  23,  24,  25,  26,  27),

    ( 24,  25,  26,  27,  29,  30,  31,  32,

      33,  34,  35,  36,  37,  38,  39,  40),

    { Lid *}

    ( 96,  96,  96,  96,  97,  98,  99, 100,

     101, 101, 101, 101,   0,   1,   2,   3),

    (  0,   1,   2,   3, 106, 107, 108, 109,

     110, 111, 112, 113, 114, 115, 116, 117),

    { Bottom }

    (118, 118, 118, 118, 124, 122, 119, 121,

     123, 126, 125, 120,  40,  39,  38,  37),

    { Handle }

    ( 41,  42,  43,  44,  45,  46,  47,  48,

      49,  50,  51,  52,  53,  54,  55,  56),

    ( 53,  54,  55,  56,  57,  58,  59,  60,

      61,  62,  63,  64,  28,  65,  66,  67),

    { Spout }

    ( 68,  69,  70,  71,  72,  73,  74,  75,

      76,  77,  78,  79,  80,  81,  82,  83),

    ( 80,  81,  82,  83,  84,  85,  86,  87,

      88,  89,  90,  91,  92,  93,  94,  95) );

 

TeaData :

  Array[0..126, 0..2] of GLfloat =

  ( (   0.2,       0,     2.7),

    (   0.2,  -0.112,     2.7),

    ( 0.112,    -0.2,     2.7),

    (     0,    -0.2,     2.7),

    (1.3375,       0, 2.53125),

    (1.3375,  -0.749, 2.53125),

    ( 0.749, -1.3375, 2.53125),

    (     0, -1.3375, 2.53125),

    (1.4375,       0, 2.53125),

    (1.4375,  -0.805, 2.53125),

    ( 0.805, -1.4375, 2.53125),

    (     0, -1.4375, 2.53125),

    (   1.5,       0,     2.4),

    (   1.5,   -0.84,     2.4),

    (  0.84,    -1.5,     2.4),

    (     0,    -1.5,     2.4),

    (  1.75,       0,   1.875),

    (  1.75,   -0.98,   1.875),

    (  0.98,   -1.75,   1.875),

    (     0,   -1.75,   1.875),

    (     2,       0,    1.35),

    (     2,   -1.12,    1.35),

    (  1.12,      -2,    1.35),

    (     0,      -2,    1.35),

    (     2,       0,     0.9),

    (     2,   -1.12,     0.9),

    (  1.12,      -2,     0.9),

    (     0,      -2,     0.9),

    (    -2,       0,     0.9),

    (     2,       0,    0.45),

    (     2,   -1.12,    0.45),

    (  1.12,      -2,    0.45),

    (     0,      -2,    0.45),

    (   1.5,       0,   0.225),

    (   1.5,   -0.84,   0.225),

    (  0.84,    -1.5,   0.225),

    (     0,    -1.5,   0.225),

    (   1.5,       0,    0.15),

    (   1.5,   -0.84,    0.15),

    (  0.84,    -1.5,    0.15),

    (     0,    -1.5,    0.15),

    (  -1.6,       0,   2.025),

    (  -1.6,    -0.3,   2.025),

    (  -1.5,    -0.3,    2.25),

    (  -1.5,       0,    2.25),

    (  -2.3,       0,   2.025),

    (  -2.3,    -0.3,   2.025),

    (  -2.5,    -0.3,    2.25),

    (  -2.5,       0,    2.25),

    (  -2.7,       0,   2.025),

    (  -2.7,    -0.3,   2.025),

    (    -3,    -0.3,    2.25),

    (    -3,       0,    2.25),

    (  -2.7,       0,     1.8),

    (  -2.7,    -0.3,     1.8),

    (    -3,    -0.3,     1.8),

    (    -3,       0,     1.8),

    (  -2.7,       0,   1.575),

    (  -2.7,    -0.3,   1.575),

    (    -3,    -0.3,    1.35),

    (    -3,       0,    1.35),

    (  -2.5,       0,   1.125),

    (  -2.5,    -0.3,   1.125),

    ( -2.65,    -0.3,  0.9375),

    ( -2.65,       0,  0.9375),

    (    -2,    -0.3,     0.9),

    (  -1.9,    -0.3,     0.6),

    (  -1.9,       0,     0.6),

    (   1.7,       0,   1.425),

    (   1.7,   -0.66,   1.425),

    (   1.7,   -0.66,     0.6),

    (   1.7,       0,     0.6),

    (   2.6,       0,   1.425),

    (   2.6,   -0.66,   1.425),

    (   3.1,   -0.66,   0.825),

    (   3.1,       0,   0.825),

    (   2.3,       0,     2.1),

    (   2.3,   -0.25,     2.1),

    (   2.4,   -0.25,   2.025),

    (   2.4,       0,   2.025),

    (   2.7,       0,     2.4),

    (   2.7,   -0.25,     2.4),

    (   3.3,   -0.25,     2.4),

    (   3.3,       0,     2.4),

    (   2.8,       0,   2.475),

    (   2.8,   -0.25,   2.475),

    ( 3.525,   -0.25, 2.49375),

    ( 3.525,       0, 2.49375),

    (   2.9,       0,   2.475),

    (   2.9,   -0.15,   2.475),

    (  3.45,   -0.15,  2.5125),

    (  3.45,       0,  2.5125),

    (   2.8,       0,     2.4),

    (   2.8,   -0.15,     2.4),

    (   3.2,   -0.15,     2.4),

    (   3.2,       0,     2.4),

    (     0,       0,    3.15),

    (   0.8,       0,    3.15),

    (   0.8,   -0.45,    3.15),

    (  0.45,    -0.8,    3.15),

    (     0,    -0.8,    3.15),

    (     0,       0,    2.85),

    (   1.4,       0,     2.4),

    (   1.4,  -0.784,     2.4),

    ( 0.784,    -1.4,     2.4),

    (     0,    -1.4,     2.4),

    (   0.4,       0,    2.55),

    (   0.4,  -0.224,    2.55),

    ( 0.224,    -0.4,    2.55),

    (     0,    -0.4,    2.55),

    (   1.3,       0,    2.55),

    (   1.3,  -0.728,    2.55),

    ( 0.728,    -1.3,    2.55),

    (     0,    -1.3,    2.55),

    (   1.3,       0,     2.4),

    (   1.3,  -0.728,     2.4),

    ( 0.728,    -1.3,     2.4),

    (     0,    -1.3,     2.4),

    (     0,       0,       0),

    ( 1.425,  -0.798,       0),

    (   1.5,       0,   0.075),

    ( 1.425,       0,       0),

    ( 0.798,  -1.425,       0),

    (     0,    -1.5,   0.075),

    (     0,  -1.425,       0),

    (   1.5,   -0.84,   0.075),

    (  0.84,    -1.5,   0.075) );

 

TeaTex :

  Array[0..1, 0..1, 0..1] of GLfloat =

    ( ((0, 0), (1, 0)),

      ((0, 1), (1, 1)) );

 

 

procedure DrawBox(Size : GLfloat; DrawType : GLenum);

procedure glutWireCube(Size : GLDouble);

procedure glutSolidCube(Size : GLDouble);

procedure glutWireSphere(

Radius : GLdouble;

Slices : GLint;

Stacks : GLint);

procedure glutSolidSphere(

Radius : GLdouble;

Slices : GLint;

Stacks : GLint);

procedure glutWireCone(

Base : GLdouble;

Height : GLdouble;

Slices : GLint;

Stacks : GLint);

procedure glutSolidCone(

Base : GLdouble;

Height : GLdouble;

Slices : GLint;

Stacks : GLint);

procedure glutWireTorus(

innerRadius : GLdouble;

outerRadius :GLdouble;

nsides : GLint;

rings : GLint);

procedure glutSolidTorus(

innerRadius : GLdouble;

outerRadius :GLdouble;

nsides : GLint;

rings : GLint);

procedure glutWireDodecahedron;

procedure glutSolidDodecahedron;

procedure Octaheadron(ShadeType : GLenum);

procedure glutWireOctaheadron;

procedure glutSolidOctaheadron;

procedure Icosahedron(ShadeType : GLenum);

procedure glutWireIcosahedron;

procedure glutSolidIcosahedron;

procedure Tetrahedron(ShadeType : GLenum);

procedure glutWireTetrahedron;

procedure glutSolidTetrahedron;

 

{ Teapot stuff }

procedure Teapot(Grid : GLint; Scale : GLdouble; ShadeType : GLenum);

procedure glutWireTeapot(Scale : GLdouble);

procedure glutSolidTeapot(Scale : GLdouble);

 

{ Generally useful stuff }

procedure Diff3(a0, a1, a2, b0, b1, b2 : GLfloat; var c : array of GLfloat);

procedure CrossProd(v1, v2 : array of GLfloat; var prod : array of GLfloat);

procedure Normalize(var v : array of GLfloat);

 

var

quadObj : GLUquadricObj;

dodec : array[0..19, 0..2] of GLfloat;

 

implementation

 

procedure DrawBox(Size : GLfloat; DrawType : GLenum);

var

V : array[0..7, 0..2] of GLfloat;

I : GLint;

HalfSize : GLfloat;

begin { DrawBox }

HalfSize := Size / 2;

V[0, 0] := -HalfSize;

V[1, 0] := -HalfSize;

V[2, 0] := -HalfSize;

V[3, 0] := -HalfSize;

V[4, 0] := HalfSize;

V[5, 0] := HalfSize;

V[6, 0] := HalfSize;

V[7, 0] := HalfSize;

 

V[0, 1] := -HalfSize;

V[1, 1] := -HalfSize;

V[4, 1] := -HalfSize;

V[5, 1] := -HalfSize;

V[2, 1] := HalfSize;

V[3, 1] := HalfSize;

V[6, 1] := HalfSize;

V[7, 1] := HalfSize;

 

V[0, 2] := -HalfSize;

V[3, 2] := -HalfSize;

V[4, 2] := -HalfSize;

V[7, 2] := -HalfSize;

V[1, 2] := HalfSize;

V[2, 2] := HalfSize;

V[5, 2] := HalfSize;

V[6, 2] := HalfSize;

 

for I := 0 to 5 do

begin

  glBegin(DrawType);

    glNormal3fv(@BoxPoints[I, 0]);

    glVertex3fv(@V[BoxFaces[I, 0], 0]);

    glVertex3fv(@V[BoxFaces[I, 1], 0]);

    glVertex3fv(@V[BoxFaces[I, 2], 0]);

    glVertex3fv(@V[BoxFaces[I, 3], 0]);

  glEnd;

end;

end; { DrawBox }

 

procedure glutWireSphere(

Radius : GLdouble;

Slices : GLint;

Stacks : GLint);

begin { glutWireSphere }

if quadObj = nil then

  quadObj := gluNewQuadric;

gluQuadricDrawStyle(quadObj, GLU_LINE);

gluQuadricNormals(quadObj, GLU_SMOOTH);

gluSphere(quadObj, Radius, Slices, Stacks);

end; { glutWireSphere }

 

procedure glutSolidSphere(

Radius : GLdouble;

Slices : GLint;

Stacks : GLint);

begin { glutSolidSphere }

if quadObj = nil then

  quadObj := gluNewQuadric;

gluQuadricDrawStyle(quadObj, GLU_FILL);

gluQuadricNormals(quadObj, GLU_SMOOTH);

gluSphere(quadObj, Radius, Slices, Stacks);

end; { glutSolidSphere }

 

procedure glutWireCube(Size : GLDouble);

begin { glutWireCube }

DrawBox(Size, GL_LINE_LOOP);

end; { glutWireCube }

 

procedure glutSolidCube(Size : GLDouble);

begin { glutSolidCube }

DrawBox(Size, GL_QUADS);

end; { glutSolidCube }

 

procedure glutWireCone(

Base : GLdouble;

Height : GLdouble;

Slices : GLint;

Stacks : GLint);

begin { glutWireCone }

if quadObj = nil then

  quadObj := gluNewQuadric;

gluQuadricDrawStyle(quadObj, GLU_LINE);

gluQuadricNormals(quadObj, GLU_SMOOTH);

gluCylinder(quadObj, base, 0.0, height, slices, stacks);

end; { glutWireCone }

 

procedure glutSolidCone(

Base : GLdouble;

Height : GLdouble;

Slices : GLint;

Stacks : GLint);

begin { glutSolidCone }

if quadObj = nil then

  quadObj := gluNewQuadric;

gluQuadricDrawStyle(quadObj, GLU_FILL);

gluQuadricNormals(quadObj, GLU_SMOOTH);

gluCylinder(quadObj, base, 0.0, height, slices, stacks);

end; { glutSolidCone }

 

procedure Doughnut(

inr : GLfloat;

outR : GLfloat;

nsides : GLint;

rings : GLint;

DrawType :GLenum);

var

i, j : integer;

theta, phi, theta1, phi1 : GLfloat;

p0, p1, p2, p3,

n0, n1, n2, n3 : array[0..2] of GLfloat;

begin { Doughnut }

for i := 0 to rings - 1 do

begin

  theta := i *2.0 * PI / rings;

  theta1 := (i + 1) * 2.0 * PI / rings;

  for j := 0 to nsides - 1 do

  begin

    phi := j *2.0 * PI / nsides;

    phi1 := (j + 1) * 2.0 * PI / nsides;

 

               p0[0] := cos(theta) * (outR + inr * cos(phi));

    p0[1] := -sin(theta) * (outR + inr * cos(phi));

    p0[2] := inr * sin(phi);

 

               p1[0] := cos(theta1) * (outR + inr * cos(phi));

    p1[1] := -sin(theta1) * (outR + inr * cos(phi));

    p1[2] := inr * sin(phi);

 

               p2[0] := cos(theta1) * (outR + inr * cos(phi1));

    p2[1] := -sin(theta1) * (outR + inr * cos(phi1));

    p2[2] := inr * sin(phi1);

 

    p3[0] := cos(theta) * (outR + inr * cos(phi1));

    p3[1] := -sin(theta) * (outR + inr * cos(phi1));

    p3[2] := inr * sin(phi1);

 

    n0[0] := cos(theta) * (cos(phi));

    n0[1] := -sin(theta) * (cos(phi));

    n0[2] := sin(phi);

 

    n1[0] := cos(theta1) * (cos(phi));

    n1[1] := -sin(theta1) * (cos(phi));

    n1[2] := sin(phi);

 

    n2[0] := cos(theta1) * (cos(phi1));

    n2[1] := -sin(theta1) * (cos(phi1));

    n2[2] := sin(phi1);

 

    n3[0] := cos(theta) * (cos(phi1));

    n3[1] := -sin(theta) * (cos(phi1));

    n3[2] := sin(phi1);

 

    glBegin(DrawType);

    glNormal3fv(@n3);

    glVertex3fv(@p3);

    glNormal3fv(@n2);

    glVertex3fv(@p2);

    glNormal3fv(@n1);

    glVertex3fv(@p1);

    glNormal3fv(@n0);

    glVertex3fv(@p0);

    glEnd();

  end;

end;

end; { Doughnut }

 

procedure glutWireTorus(

innerRadius : GLdouble;

outerRadius :GLdouble;

nsides : GLint;

rings : GLint);

begin { glutWireTorus }

Doughnut(innerRadius, outerRadius, nsides, rings, GL_LINE_LOOP);

end; { glutWireTorus }

 

procedure glutSolidTorus(

innerRadius : GLdouble;

outerRadius :GLdouble;

nsides : GLint;

rings : GLint);

begin { glutSolidTorus }

Doughnut(innerRadius, outerRadius, nsides, rings, GL_QUADS);

end; { glutSolidTorus }

 

procedure initDodecahedron;

var

alpha, beta : GLfloat;

begin { initDodecahedron }

alpha := sqrt(2.0 / (3.0 + sqrt(5.0)));

beta := 1.0 + sqrt(6.0 / (3.0 + sqrt(5.0)) -

  2.0 + 2.0 * sqrt(2.0 / (3.0 + sqrt(5.0))));

 

dodec[0, 0] := -alpha;  dodec[0, 1] := 0;       dodec[0, 2] := beta;

dodec[1, 0] := alpha;   dodec[1, 1] := 0;       dodec[1, 2] := beta;

dodec[2, 0] := -1;      dodec[2, 1] := -1;      dodec[2, 2] := -1;

dodec[3, 0] := -1;      dodec[3, 1] := -1;      dodec[3, 2] := 1;

dodec[4, 0] := -1;      dodec[4, 1] := 1;       dodec[4, 2] := -1;

dodec[5, 0] := -1;      dodec[5, 1] := 1;       dodec[5, 2] := 1;

dodec[6, 0] := 1;       dodec[6, 1] := -1;      dodec[6, 2] := -1;

dodec[7, 0] := 1;       dodec[7, 1] := -1;      dodec[7, 2] := 1;

dodec[8, 0] := 1;       dodec[8, 1] := 1;       dodec[8, 2] := -1;

dodec[9, 0] := 1;       dodec[9, 1] := 1;       dodec[9, 2] := 1;

dodec[10, 0] := beta;   dodec[10, 1] := alpha;  dodec[10, 2] := 0;

dodec[11, 0] := beta;   dodec[11, 1] := -alpha; dodec[11, 2] := 0;

dodec[12, 0] := -beta;  dodec[12, 1] := alpha;  dodec[12, 2] := 0;

dodec[13, 0] := -beta;  dodec[13, 1] := -alpha; dodec[13, 2] := 0;

dodec[14, 0] := -alpha; dodec[14, 1] := 0;      dodec[14, 2] := -beta;

dodec[15, 0] := alpha;  dodec[15, 1] := 0;      dodec[15, 2] := -beta;

dodec[16, 0] := 0;      dodec[16, 1] := beta;   dodec[16, 2] := alpha;

dodec[17, 0] := 0;      dodec[17, 1] := beta;   dodec[17, 2] := -alpha;

dodec[18, 0] := 0;      dodec[18, 1] := -beta;  dodec[18, 2] := alpha;

dodec[19, 0] := 0;      dodec[19, 1] := -beta;  dodec[19, 2] := -alpha;

end; { initDodecaheadron }

 

procedure Diff3(

a0, a1, a2, b0, b1, b2 : GLfloat;

var c : array of GLfloat);

begin { Diff3 }

c[0] := a0 - b0;

c[1] := a1 - b1;

c[2] := a2 - b2;

end; { Diff3 }

 

procedure CrossProd(

v1, v2 : array of GLfloat;

var prod : array of GLfloat);

var

p : array[0..2] of GLfloat;

begin { CrossProd }

p[0] := v1[1] * v2[2] - v2[1] * v1[2];

p[1] := v1[2] * v2[0] - v2[2] * v1[0];

p[2] := v1[0] * v2[1] - v2[0] * v1[1];

prod[0] := p[0];

prod[1] := p[1];

prod[2] := p[2];

end; { CrossProd }

 

procedure Normalize(var v : array of GLfloat);

var

d : GLfloat;

begin { Normalize }

d := sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);

d := 1 / d;

v[0] := v[0] * d;

v[1] := v[1] * d;

v[2] := v[2] * d;

end; { Normalize }

 

procedure Pentagon(a, b, c, d, e : integer; shadeType : GLenum);

var

n0, d1, d2 : array[0..2] of GLfloat;

begin { Pentagon }

Diff3(dodec[a, 0], dodec[a, 1], dodec[1, 2],

      dodec[b, 0], dodec[b, 1], dodec[b, 2], d1);

Diff3(dodec[b, 0], dodec[b, 1], dodec[b, 2],

      dodec[c, 0], dodec[c, 1], dodec[c, 2], d2);

CrossProd(d1, d2, n0);

Normalize(n0);

 

glBegin(shadeType);

  glNormal3fv(@n0);

  glVertex3fv(@dodec[a, 0]);

  glVertex3fv(@dodec[b, 0]);

  glVertex3fv(@dodec[c, 0]);

  glVertex3fv(@dodec[d, 0]);

  glVertex3fv(@dodec[e, 0]);

glEnd();

end; { Pentagon }

 

procedure Dodecahedron(DrawType : GLenum);

begin { Dodecahedron }

pentagon(0, 1, 9, 16, 5, DrawType);

pentagon(1, 0, 3, 18, 7, DrawType);

pentagon(1, 7, 11, 10, 9, DrawType);

pentagon(11, 7, 18, 19, 6, DrawType);

pentagon(8, 17, 16, 9, 10, DrawType);

pentagon(2, 14, 15, 6, 19, DrawType);

pentagon(2, 13, 12, 4, 14, DrawType);

pentagon(2, 19, 18, 3, 13, DrawType);

pentagon(3, 0, 5, 12, 13, DrawType);

pentagon(6, 15, 8, 10, 11, DrawType);

pentagon(4, 17, 8, 15, 14, DrawType);

pentagon(4, 12, 5, 16, 17, DrawType);

end; { Dodecahedron }

 

procedure glutWireDodecahedron;

begin { glutWireDodecahedron }

Dodecahedron(GL_LINE_LOOP);

end; { glutWireDodecahedron }

 

procedure glutSolidDodecahedron;

begin { glutSolidDodecahedron }

Dodecahedron(GL_TRIANGLE_FAN);

end; { glutSolidDodecahedron }

 

procedure RecordItem(n1, n2, n3 :  array of GLfloat; ShadeType : GLenum);

var

q0, q1 : array[0..2] of GLfloat;

begin { RecordItem }

Diff3(n1[0], n1[1], n1[2], n2[0], n2[1], n2[2], q0);

Diff3(n2[0], n2[1], n2[2], n3[0], n3[1], n3[2], q1);

CrossProd(q0, q1, q1);

Normalize(q1);

 

glBegin(shadeType);

  glNormal3fv(@q1);

  glVertex3fv(@n1);

  glVertex3fv(@n2);

  glVertex3fv(@n3);

glEnd;

end; { RecordItem }

 

procedure SubDivide(

v0, v1, v2 : array of GLfloat;

ShadeType : GLenum);

var

Depth : Integer;

w0, w1, w2 : array[0..2] of GLfloat;

l : GLfloat;

i, j, k, n : Integer;

begin { SubDivide }

Depth := 1;

for i := 0 to Depth - 1 do

begin

  j := 0;

  while i + j < Depth do

  begin

    k := depth - i - j;

    for n := 0 to 2 do

    begin

      w0[n] := (i * v0[n] + j * v1[n] + k * v2[n]) / depth;

      w1[n] := ((i + 1) * v0[n] + j * v1[n] + (k - 1) * v2[n])

        / depth;

      w2[n] := (i * v0[n] + (j + 1) * v1[n] + (k - 1) * v2[n])

        / depth;

    end;

    l := sqrt(w0[0] * w0[0] + w0[1] * w0[1] + w0[2] * w0[2]);

    w0[0] := w0[0] / l;

    w0[1] := w0[1] / l;

    w0[2] := w0[2] / l;

    l := sqrt(w1[0] * w1[0] + w1[1] * w1[1] + w1[2] * w1[2]);

    w1[0] := w1[0] / l;

    w1[1] := w1[1] / l;

    w1[2] := w1[2] / l;

    l := sqrt(w2[0] * w2[0] + w2[1] * w2[1] + w2[2] * w2[2]);

    w2[0] := w2[0] / l;

    w2[1] := w2[1] / l;

    w2[2] := w2[2] / l;

    RecordItem(w1, w0, w2, ShadeType);

    Inc(j);

  end;

end;

end; { SubDivide }

 

procedure DrawTriangle(

I : Integer;

Data : Array of TGLfloat3v;

NDX : Array of TInteger3v;

ShadeType : GLenum);

var

X0, X1, X2 : TGLfloat3v;

begin { DrawTriangle }

X0 := Data[NDX[i, 0]];

X1 := Data[NDX[i, 1]];

X2 := Data[NDX[i, 2]];

SubDivide(X0, X1, X2, ShadeType);

end; { DrawTriangle }

 

procedure Octaheadron(ShadeType : glEnum);

var

I : Integer;

begin { Octaheadron }

for I := 0 to 7 do

  DrawTriangle(I, OctData, OctIndex, ShadeType);

end; { Octaheadron }

 

procedure glutWireOctaheadron;

begin { glutWireOctaheadron }

Octaheadron(GL_LINE_LOOP);

end; { glutWireOctaheadron }

 

procedure glutSolidOctaheadron;

begin { glutSolidOctaheadron }

Octaheadron(GL_TRIANGLES);

end; { glutSolidOctaheadron }

 

procedure Icosahedron(ShadeType : GLenum);

var

I : Integer;

begin { Icosahedron }

for I := 0 to 19 do

  DrawTriangle(I, IcoData, IcoIndex, ShadeType);

end; { Icosahedron }

 

procedure glutWireIcosahedron;

begin { glutWireIcosahedron }

Icosahedron(GL_LINE_LOOP);

end; { glutWireIcosahedron }

 

procedure glutSolidIcosahedron;

begin { glutSolidIcosahedron }

Icosahedron(GL_TRIANGLES);

end; { glutSolidIcosahedron }

 

procedure Tetrahedron(ShadeType : GLenum);

var

I : Integer;

begin { Tetrahedron }

for I := 0 to 3 do

  DrawTriangle(I, TetData, TetIndex, ShadeType);

end; { Tetrahedron }

 

procedure glutWireTetrahedron;

begin { glutWireTetrahedron }

Tetrahedron(GL_LINE_LOOP);

end; { glutWireTetrahedron }

 

procedure glutSolidTetrahedron;

begin { glutSolidTetrahedron }

Tetrahedron(GL_TRIANGLES);

end; { glutSolidTetrahedron }

 

{ Teapot stuff }

 

procedure Teapot(Grid : GLint; Scale : GLdouble; ShadeType : GLenum);

var

P, Q, R, S : Array[0..3, 0..3, 0..2] of GLfloat;

I, J, K, L : GLInt;

begin { Teapot }

glPushAttrib(GL_ENABLE_BIT or GL_EVAL_BIT);

glEnable(GL_AUTO_NORMAL);

glEnable(GL_NORMALIZE);

glEnable(GL_MAP2_VERTEX_3);

glEnable(GL_MAP2_TEXTURE_COORD_2);

glPushMatrix;

glRotatef(270.0, 1.0, 0.0, 0.0);

glScalef(0.5 * Scale, 0.5 * Scale, 0.5 * Scale);

glTranslatef(0.0, 0.0, -1.5);

for I := 0 to 9 do

begin

  for J := 0 to 3 do

    for K := 0 to 3 do

      for L := 0 to 2 do

      begin

        P[J, K, L] := TeaData[PatchData[I, J * 4 + K], L];

        Q[J, K, L] := TeaData[PatchData[I, J * 4 + (3 - K)], L];

        if L = 1 then

          Q[J, K, L] := -Q[J, K, L];

        if i < 6 then

        begin

          R[J, K, L] := TeaData[PatchData[I, J * 4 + (3 - K)], L];

          if L = 0 then

            R[J, K, L] := -R[J, K, L];

          S[J, K, L] := TeaData[PatchData[I, J * 4 + K], L];

          if L = 0 then

            S[J, K, L] := -S[J, K, L];

          if L = 1 then

            S[J, K, L] := -S[J, K, L];

        end;

      end;

  glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 0, 1, 4, 2, @TeaTex);

  glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, @P[0, 0, 0]);

  glMapGrid2f(Grid, 0.0, 1.0, Grid, 0.0, 1.0);

  glEvalMesh2(ShadeType, 0, Grid, 0, Grid);

  glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, @Q[0, 0, 0]);

  glEvalMesh2(ShadeType, 0, Grid, 0, Grid);

  if I < 6 then

  begin

    glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, @R[0, 0, 0]);

    glEvalMesh2(ShadeType, 0, Grid, 0, Grid);

    glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, @S[0, 0, 0]);

    glEvalMesh2(ShadeType, 0, Grid, 0, Grid);

  end;

end;

glPopMatrix;

glPopAttrib;

end; { Teapot }

 

procedure glutWireTeapot(Scale : GLdouble);

begin { glutWireTeapot }

Teapot(10, Scale, GL_LINE);

end; { glutWireTeapot }

 

procedure glutSolidTeapot(Scale : GLdouble);

begin { glutSolidTeapot }

Teapot(14, Scale, GL_FILL);

end; { glutSolidTeapot }

 

initialization

initDodecahedron;

 

end.