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Amiga Format AFCD52 (Issue 136, May 2000).iso
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mesa
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mesa-glut
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src-glut.aos
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glutshapes.c
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2000-02-23
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/* Copyright (c) Mark J. Kilgard, 1994, 1997. */
/**
(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 Unpublished-- rights reserved under the copyright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.
*/
/*
* glutShapes.c
*
* Modified 27 Jun 1998
* by Jarno van der Linden
* jarno@kcbbs.gen.nz
*
* Based on glut_shapes.c
* Some changes to work with Amiga GLUT
*
*/
#include <math.h>
#include "glutstuff.h"
/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
static GLUquadricObj *quadObj;
#define QUAD_OBJ_INIT() { if(!quadObj) initQuadObj(); }
static void initQuadObj(void)
{
quadObj = gluNewQuadric();
// if (!quadObj)
// __glutFatalError("out of memory.");
}
/* CENTRY */
void glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
{
QUAD_OBJ_INIT();
gluQuadricDrawStyle(quadObj, GLU_LINE);
gluQuadricNormals(quadObj, GLU_SMOOTH);
/* If we ever changed/used the texture or orientation state
* of quadObj, we'd need to change it to the defaults here
* with gluQuadricTexture and/or gluQuadricOrientation. */
gluSphere(quadObj, radius, slices, stacks);
}
void glutSolidSphere(GLdouble radius, GLint slices, GLint stacks)
{
QUAD_OBJ_INIT();
gluQuadricDrawStyle(quadObj, GLU_FILL);
gluQuadricNormals(quadObj, GLU_SMOOTH);
/* If we ever changed/used the texture or orientation state
* of quadObj, we'd need to change it to the defaults here
* with gluQuadricTexture and/or gluQuadricOrientation. */
gluSphere(quadObj, radius, slices, stacks);
}
void glutWireCone(GLdouble base, GLdouble height, GLint slices, GLint stacks)
{
QUAD_OBJ_INIT();
gluQuadricDrawStyle(quadObj, GLU_LINE);
gluQuadricNormals(quadObj, GLU_SMOOTH);
/* If we ever changed/used the texture or orientation state
* of quadObj, we'd need to change it to the defaults here
* with gluQuadricTexture and/or gluQuadricOrientation. */
gluCylinder(quadObj, base, 0.0, height, slices, stacks);
}
void glutSolidCone(GLdouble base, GLdouble height, GLint slices, GLint stacks)
{
QUAD_OBJ_INIT();
gluQuadricDrawStyle(quadObj, GLU_FILL);
gluQuadricNormals(quadObj, GLU_SMOOTH);
/* If we ever changed/used the texture or orientation state
* of quadObj, we'd need to change it to the defaults here
* with gluQuadricTexture and/or gluQuadricOrientation. */
gluCylinder(quadObj, base, 0.0, height, slices, stacks);
}
/* ENDCENTRY */
static void drawBox(GLfloat size, GLenum type)
{
static GLfloat n[6][3] =
{
{-1.0, 0.0, 0.0},
{0.0, 1.0, 0.0},
{1.0, 0.0, 0.0},
{0.0, -1.0, 0.0},
{0.0, 0.0, 1.0},
{0.0, 0.0, -1.0}
};
static GLint faces[6][4] =
{
{0, 1, 2, 3},
{3, 2, 6, 7},
{7, 6, 5, 4},
{4, 5, 1, 0},
{5, 6, 2, 1},
{7, 4, 0, 3}
};
GLfloat v[8][3];
GLint i;
v[0][0] = v[1][0] = v[2][0] = v[3][0] = -size / 2;
v[4][0] = v[5][0] = v[6][0] = v[7][0] = size / 2;
v[0][1] = v[1][1] = v[4][1] = v[5][1] = -size / 2;
v[2][1] = v[3][1] = v[6][1] = v[7][1] = size / 2;
v[0][2] = v[3][2] = v[4][2] = v[7][2] = -size / 2;
v[1][2] = v[2][2] = v[5][2] = v[6][2] = size / 2;
for (i = 5; i >= 0; i--) {
glBegin(type);
glNormal3fv(&n[i][0]);
glVertex3fv(&v[faces[i][0]][0]);
glVertex3fv(&v[faces[i][1]][0]);
glVertex3fv(&v[faces[i][2]][0]);
glVertex3fv(&v[faces[i][3]][0]);
glEnd();
}
}
/* CENTRY */
void glutWireCube(GLdouble size)
{
drawBox(size, GL_LINE_LOOP);
}
void glutSolidCube(GLdouble size)
{
drawBox(size, GL_QUADS);
}
/* ENDCENTRY */
static void doughnut(GLfloat r, GLfloat R, GLint nsides, GLint rings)
{
int i, j;
GLfloat theta, phi, theta1;
GLfloat cosTheta, sinTheta;
GLfloat cosTheta1, sinTheta1;
GLfloat ringDelta, sideDelta;
ringDelta = 2.0 * M_PI / rings;
sideDelta = 2.0 * M_PI / nsides;
theta = 0.0;
cosTheta = 1.0;
sinTheta = 0.0;
for (i = rings - 1; i >= 0; i--) {
theta1 = theta + ringDelta;
cosTheta1 = cos(theta1);
sinTheta1 = sin(theta1);
glBegin(GL_QUAD_STRIP);
phi = 0.0;
for (j = nsides; j >= 0; j--) {
GLfloat cosPhi, sinPhi, dist;
phi += sideDelta;
cosPhi = cos(phi);
sinPhi = sin(phi);
dist = R + r * cosPhi;
glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
}
glEnd();
theta = theta1;
cosTheta = cosTheta1;
sinTheta = sinTheta1;
}
}
/* CENTRY */
void glutWireTorus(GLdouble innerRadius, GLdouble outerRadius,
GLint nsides, GLint rings)
{
glPushAttrib(GL_POLYGON_BIT);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
doughnut(innerRadius, outerRadius, nsides, rings);
glPopAttrib();
}
void glutSolidTorus(GLdouble innerRadius, GLdouble outerRadius,
GLint nsides, GLint rings)
{
doughnut(innerRadius, outerRadius, nsides, rings);
}
/* ENDCENTRY */
static GLfloat dodec[20][3];
static void initDodecahedron(void)
{
GLfloat alpha, beta;
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))));
/* *INDENT-OFF* */
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;
/* *INDENT-ON* */
}
#define DIFF3(_a,_b,_c) { \
(_c)[0] = (_a)[0] - (_b)[0]; \
(_c)[1] = (_a)[1] - (_b)[1]; \
(_c)[2] = (_a)[2] - (_b)[2]; \
}
static void crossprod(GLfloat v1[3], GLfloat v2[3], GLfloat prod[3])
{
GLfloat p[3]; /* in case prod == v1 or v2 */
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];
}
static void normalize(GLfloat v[3])
{
GLfloat d;
d = sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
if (d == 0.0) {
// __glutWarning("normalize: zero length vector");
v[0] = d = 1.0;
}
d = 1 / d;
v[0] *= d;
v[1] *= d;
v[2] *= d;
}
static void pentagon(int a, int b, int c, int d, int e, GLenum shadeType)
{
GLfloat n0[3], d1[3], d2[3];
DIFF3(dodec[a], dodec[b], d1);
DIFF3(dodec[b], dodec[c], 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();
}
static void dodecahedron(GLenum type)
{
static int inited = 0;
if (inited == 0) {
inited = 1;
initDodecahedron();
}
pentagon(0, 1, 9, 16, 5, type);
pentagon(1, 0, 3, 18, 7, type);
pentagon(1, 7, 11, 10, 9, type);
pentagon(11, 7, 18, 19, 6, type);
pentagon(8, 17, 16, 9, 10, type);
pentagon(2, 14, 15, 6, 19, type);
pentagon(2, 13, 12, 4, 14, type);
pentagon(2, 19, 18, 3, 13, type);
pentagon(3, 0, 5, 12, 13, type);
pentagon(6, 15, 8, 10, 11, type);
pentagon(4, 17, 8, 15, 14, type);
pentagon(4, 12, 5, 16, 17, type);
}
/* CENTRY */
void glutWireDodecahedron(void)
{
dodecahedron(GL_LINE_LOOP);
}
void glutSolidDodecahedron(void)
{
dodecahedron(GL_TRIANGLE_FAN);
}
/* ENDCENTRY */
static void recorditem(GLfloat * n1, GLfloat * n2, GLfloat * n3,
GLenum shadeType)
{
GLfloat q0[3], q1[3];
DIFF3(n1, n2, q0);
DIFF3(n2, n3, q1);
crossprod(q0, q1, q1);
normalize(q1);
glBegin(shadeType);
glNormal3fv(q1);
glVertex3fv(n1);
glVertex3fv(n2);
glVertex3fv(n3);
glEnd();
}
static void subdivide(GLfloat * v0, GLfloat * v1, GLfloat * v2,
GLenum shadeType)
{
int depth;
GLfloat w0[3], w1[3], w2[3];
GLfloat l;
int i, j, k, n;
depth = 1;
for (i = 0; i < depth; i++) {
for (j = 0; i + j < depth; j++) {
k = depth - i - j;
for (n = 0; n < 3; n++) {
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;
}
l = sqrt(w0[0] * w0[0] + w0[1] * w0[1] + w0[2] * w0[2]);
w0[0] /= l;
w0[1] /= l;
w0[2] /= l;
l = sqrt(w1[0] * w1[0] + w1[1] * w1[1] + w1[2] * w1[2]);
w1[0] /= l;
w1[1] /= l;
w1[2] /= l;
l = sqrt(w2[0] * w2[0] + w2[1] * w2[1] + w2[2] * w2[2]);
w2[0] /= l;
w2[1] /= l;
w2[2] /= l;
recorditem(w1, w0, w2, shadeType);
}
}
}
static void drawtriangle(int i, GLfloat data[][3], int ndx[][3],
GLenum shadeType)
{
GLfloat *x0, *x1, *x2;
x0 = data[ndx[i][0]];
x1 = data[ndx[i][1]];
x2 = data[ndx[i][2]];
subdivide(x0, x1, x2, shadeType);
}
/* octahedron data: The octahedron produced is centered at the
* origin and has radius 1.0 */
static GLfloat odata[6][3] =
{
{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}
};
static int ondex[8][3] =
{
{0, 4, 2},
{1, 2, 4},
{0, 3, 4},
{1, 4, 3},
{0, 2, 5},
{1, 5, 2},
{0, 5, 3},
{1, 3, 5}
};
static void octahedron(GLenum shadeType)
{
int i;
for (i = 7; i >= 0; i--) {
drawtriangle(i, odata, ondex, shadeType);
}
}
/* CENTRY */
void glutWireOctahedron(void)
{
octahedron(GL_LINE_LOOP);
}
void glutSolidOctahedron(void)
{
octahedron(GL_TRIANGLES);
}
/* ENDCENTRY */
/* icosahedron data: These numbers are rigged to make an
* icosahedron of radius 1.0 */
#define X .525731112119133606
#define Z .850650808352039932
static GLfloat idata[12][3] =
{
{-X, 0, Z},
{X, 0, Z},
{-X, 0, -Z},
{X, 0, -Z},
{0, Z, X},
{0, Z, -X},
{0, -Z, X},
{0, -Z, -X},
{Z, X, 0},
{-Z, X, 0},
{Z, -X, 0},
{-Z, -X, 0}
};
static int indexes[20][3] =
{
{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},
};
static void icosahedron(GLenum shadeType)
{
int i;
for (i = 19; i >= 0; i--) {
drawtriangle(i, idata, indexes, shadeType);
}
}
/* CENTRY */
void glutWireIcosahedron(void)
{
icosahedron(GL_LINE_LOOP);
}
void glutSolidIcosahedron(void)
{
icosahedron(GL_TRIANGLES);
}
/* ENDCENTRY */
/* tetrahedron data: */
#define T 1.73205080756887729
static GLfloat tdata[4][3] =
{
{T, T, T},
{T, -T, -T},
{-T, T, -T},
{-T, -T, T}
};
static int tndex[4][3] =
{
{0, 1, 3},
{2, 1, 0},
{3, 2, 0},
{1, 2, 3}
};
static void tetrahedron(GLenum shadeType)
{
int i;
for (i = 3; i >= 0; i--)
drawtriangle(i, tdata, tndex, shadeType);
}
/* CENTRY */
void glutWireTetrahedron(void)
{
tetrahedron(GL_LINE_LOOP);
}
void glutSolidTetrahedron(void)
{
tetrahedron(GL_TRIANGLES);
}
/* ENDCENTRY */