WebSVN - shark - Rev 55 - /shark/trunk/ports/mesa/src-glu/quadric.c

/* $Id: quadric.c,v 1.1 2003-02-28 11:42:07 pj Exp $ */

/*
* Mesa 3-D graphics library
* Version: 3.3
* Copyright (C) 1999-2000 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* TODO:
* texture coordinate support
* flip normals according to orientation
* there's still some inside/outside orientation bugs in possibly all
* but the sphere function
*/

#ifdef PC_HEADER
#include "all.h"
#else
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "gluP.h"
#endif

#ifndef M_PI
# define M_PI (3.1415926)
#endif

/*
* Convert degrees to radians:
*/
#define DEG_TO_RAD(A) ((A)*(M_PI/180.0))

/*
* Sin and Cos for degree angles:
*/
#define SIND( A ) sin( (A)*(M_PI/180.0) )
#define COSD( A) cos( (A)*(M_PI/180.0) )

/*
* Texture coordinates if texture flag is set
*/
#define TXTR_COORD(x,y) if (qobj->TextureFlag) glTexCoord2f(x,y);

struct GLUquadric
{
GLenum DrawStyle; /* GLU_FILL, LINE, SILHOUETTE, or POINT */
GLenum Orientation; /* GLU_INSIDE or GLU_OUTSIDE */
GLboolean TextureFlag; /* Generate texture coords? */
GLenum Normals; /* GLU_NONE, GLU_FLAT, or GLU_SMOOTH */
void (GLCALLBACK * ErrorFunc) (GLenum err); /* Error handler callback function */
};

/*
* Process a GLU error.
*/
static void
quadric_error(GLUquadricObj * qobj, GLenum error, const char *msg)
{
/* Call the error call back function if any */
if (qobj->ErrorFunc) {
(*qobj->ErrorFunc) (error);
}
/* Print a message to stdout if MESA_DEBUG variable is defined */
if (getenv("MESA_DEBUG")) {
fprintf(stderr, "GLUError: %s: %s\n", (char *) gluErrorString(error),
msg);
}
}

GLUquadricObj *GLAPIENTRY
gluNewQuadric(void)
{
GLUquadricObj *q;

q = (GLUquadricObj *) malloc(sizeof(struct GLUquadric));
if (q) {
q->DrawStyle = GLU_FILL;
q->Orientation = GLU_OUTSIDE;
q->TextureFlag = GL_FALSE;
q->Normals = GLU_SMOOTH;
q->ErrorFunc = NULL;
}
return q;
}

void GLAPIENTRY
gluDeleteQuadric(GLUquadricObj * state)
{
if (state) {
free((void *) state);
}
}

/*
* Set the drawing style to be GLU_FILL, GLU_LINE, GLU_SILHOUETTE,
* or GLU_POINT.
*/
void GLAPIENTRY
gluQuadricDrawStyle(GLUquadricObj * quadObject, GLenum drawStyle)
{
if (quadObject && (drawStyle == GLU_FILL || drawStyle == GLU_LINE
|| drawStyle == GLU_SILHOUETTE
|| drawStyle == GLU_POINT)) {
quadObject->DrawStyle = drawStyle;
}
else {
quadric_error(quadObject, GLU_INVALID_ENUM, "qluQuadricDrawStyle");
}
}

/*
* Set the orientation to GLU_INSIDE or GLU_OUTSIDE.
*/
void GLAPIENTRY
gluQuadricOrientation(GLUquadricObj * quadObject, GLenum orientation)
{
if (quadObject
&& (orientation == GLU_INSIDE || orientation == GLU_OUTSIDE)) {
quadObject->Orientation = orientation;
}
else {
quadric_error(quadObject, GLU_INVALID_ENUM, "qluQuadricOrientation");
}
}

/*
* Set the error handler callback function.
*/
void GLAPIENTRY
gluQuadricCallback(GLUquadricObj * qobj,
GLenum which, void (GLCALLBACK * fn) ())
{
/*
* UGH, this is a mess! I thought ANSI was a standard.
*/
if (qobj && which == GLU_ERROR) {
#ifdef __CYGWIN32__
qobj->ErrorFunc = (void (GLCALLBACKPCAST) (GLenum)) fn;
#elif defined(OPENSTEP)
qobj->ErrorFunc = (void (*)(GLenum)) fn;
#elif defined(_WIN32)
qobj->ErrorFunc = (void (GLCALLBACK *) (int)) fn;
#elif defined(__STORM__)
qobj->ErrorFunc = (void (GLCALLBACK *) (GLenum)) fn;
#elif defined(__BEOS__)
qobj->ErrorFunc = (void (*)(GLenum)) fn;
#else
qobj->ErrorFunc = (void (GLCALLBACK *) ()) fn;
#endif
}
}

void GLAPIENTRY
gluQuadricNormals(GLUquadricObj * quadObject, GLenum normals)
{
if (quadObject
&& (normals == GLU_NONE || normals == GLU_FLAT
|| normals == GLU_SMOOTH)) {
quadObject->Normals = normals;
}
}

void GLAPIENTRY
gluQuadricTexture(GLUquadricObj * quadObject, GLboolean textureCoords)
{
if (quadObject) {
quadObject->TextureFlag = textureCoords;
}
}

/*
* Call glNormal3f after scaling normal to unit length.
*/
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 GLAPIENTRY
gluCylinder(GLUquadricObj * qobj,
GLdouble baseRadius, GLdouble topRadius,
GLdouble height, GLint slices, GLint stacks)
{
GLdouble da, r, dr, dz;
GLfloat x, y, z, nz, nsign;
GLint i, j;

if (qobj->Orientation == GLU_INSIDE) {
nsign = -1.0;
}
else {
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 */

if (qobj->DrawStyle == GLU_POINT) {
glBegin(GL_POINTS);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);

z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glVertex3f(x * r, y * r, z);
z += dz;
r += dr;
}
}
glEnd();
}
else if (qobj->DrawStyle == GLU_LINE || qobj->DrawStyle == GLU_SILHOUETTE) {
/* Draw rings */
if (qobj->DrawStyle == GLU_LINE) {
z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * r, y * r, z);
}
glEnd();
z += dz;
r += dr;
}
}
else {
/* draw one ring at each end */
if (baseRadius != 0.0) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
}
glEnd();
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
}
/* draw length lines */
glBegin(GL_LINES);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
else if (qobj->DrawStyle == GLU_FILL) {
GLfloat ds = 1.0 / slices;
GLfloat dt = 1.0 / stacks;
GLfloat t = 0.0;
z = 0.0;
r = baseRadius;
for (j = 0; j < stacks; j++) {
GLfloat s = 0.0;
glBegin(GL_QUAD_STRIP);
for (i = 0; i <= slices; i++) {
GLfloat x, y;
if (i == slices) {
x = sin(0.0);
y = cos(0.0);
}
else {
x = sin(i * da);
y = cos(i * da);
}
if (nsign == 1.0) {
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t);
glVertex3f(x * r, y * r, z);
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t + dt);
glVertex3f(x * (r + dr), y * (r + dr), z + dz);
}
else {
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t);
glVertex3f(x * r, y * r, z);
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t + dt);
glVertex3f(x * (r + dr), y * (r + dr), z + dz);
}
s += ds;
} /* for slices */
glEnd();
r += dr;
t += dt;
z += dz;
} /* for stacks */
}
}

void GLAPIENTRY
gluSphere(GLUquadricObj * qobj, GLdouble radius, GLint slices, GLint stacks)
{
GLfloat rho, drho, theta, dtheta;
GLfloat x, y, z;
GLfloat s, t, ds, dt;
GLint i, j, imin, imax;
GLboolean normals;
GLfloat nsign;

if (qobj->Normals == GLU_NONE) {
normals = GL_FALSE;
}
else {
normals = GL_TRUE;
}
if (qobj->Orientation == GLU_INSIDE) {
nsign = -1.0;
}
else {
nsign = 1.0;
}

drho = M_PI / (GLfloat) stacks;
dtheta = 2.0 * M_PI / (GLfloat) slices;

/* texturing: s goes from 0.0/0.25/0.5/0.75/1.0 at +y/+x/-y/-x/+y axis */
/* t goes from -1.0/+1.0 at z = -radius/+radius (linear along longitudes) */
/* cannot use triangle fan on texturing (s coord. at top/bottom tip varies) */

if (qobj->DrawStyle == GLU_FILL) {
if (!qobj->TextureFlag) {
/* draw +Z end as a triangle fan */
glBegin(GL_TRIANGLE_FAN);
glNormal3f(0.0, 0.0, 1.0);
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 (qobj->TextureFlag) {
imin = 0;
imax = stacks;
}
else {
imin = 1;
imax = stacks - 1;
}

/* draw intermediate stacks as quad strips */
for (i = imin; i < imax; 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);
TXTR_COORD(s, 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);
TXTR_COORD(s, t - dt);
s += ds;
glVertex3f(x * radius, y * radius, z * radius);
}
glEnd();
t -= dt;
}

if (!qobj->TextureFlag) {
/* draw -Z end as a triangle fan */
glBegin(GL_TRIANGLE_FAN);
glNormal3f(0.0, 0.0, -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);
s -= ds;
glVertex3f(x * radius, y * radius, z * radius);
}
glEnd();
}
}
else if (qobj->DrawStyle == GLU_LINE || qobj->DrawStyle == GLU_SILHOUETTE) {
/* draw stack lines */
for (i = 1; i < stacks; i++) { /* stack line at i==stacks-1 was missing here */
rho = i * drho;
glBegin(GL_LINE_LOOP);
for (j = 0; j < slices; j++) {
theta = j * dtheta;
x = cos(theta) * sin(rho);
y = sin(theta) * sin(rho);
z = cos(rho);
if (normals)
glNormal3f(x * nsign, y * nsign, z * nsign);
glVertex3f(x * radius, y * radius, z * radius);
}
glEnd();
}
/* draw slice lines */
for (j = 0; j < slices; j++) {
theta = j * dtheta;
glBegin(GL_LINE_STRIP);
for (i = 0; i <= stacks; i++) {
rho = i * drho;
x = cos(theta) * sin(rho);
y = sin(theta) * sin(rho);
z = cos(rho);
if (normals)
glNormal3f(x * nsign, y * nsign, z * nsign);
glVertex3f(x * radius, y * radius, z * radius);
}
glEnd();
}
}
else if (qobj->DrawStyle == GLU_POINT) {
/* top and bottom-most points */
glBegin(GL_POINTS);
if (normals)
glNormal3f(0.0, 0.0, nsign);
glVertex3d(0.0, 0.0, radius);
if (normals)
glNormal3f(0.0, 0.0, -nsign);
glVertex3d(0.0, 0.0, -radius);

/* loop over stacks */
for (i = 1; i < stacks - 1; i++) {
rho = i * drho;
for (j = 0; j < slices; j++) {
theta = j * dtheta;
x = cos(theta) * sin(rho);
y = sin(theta) * sin(rho);
z = cos(rho);
if (normals)
glNormal3f(x * nsign, y * nsign, z * nsign);
glVertex3f(x * radius, y * radius, z * radius);
}
}
glEnd();
}

}

void GLAPIENTRY
gluDisk(GLUquadricObj * qobj,
GLdouble innerRadius, GLdouble outerRadius, GLint slices, GLint loops)
{
GLfloat da, dr;
#if 0
GLdouble a, da;
GLfloat r, dr;
GLfloat x, y;
GLfloat r1, r2, dtc;
GLint s, l;
#endif

/* Normal vectors */
if (qobj->Normals != GLU_NONE) {
if (qobj->Orientation == GLU_OUTSIDE) {
glNormal3f(0.0, 0.0, +1.0);
}
else {
glNormal3f(0.0, 0.0, -1.0);
}
}

da = 2.0 * M_PI / slices;
dr = (outerRadius - innerRadius) / (GLfloat) loops;

switch (qobj->DrawStyle) {
case GLU_FILL:
{
/* 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)
*/
GLfloat dtc = 2.0f * outerRadius;
GLfloat sa, ca;
GLfloat r1 = innerRadius;
GLint l;
for (l = 0; l < loops; l++) {
GLfloat r2 = r1 + dr;
if (qobj->Orientation == GLU_OUTSIDE) {
GLint s;
glBegin(GL_QUAD_STRIP);
for (s = 0; s <= slices; s++) {
GLfloat a;
if (s == slices)
a = 0.0;
else
a = s * da;
sa = sin(a);
ca = cos(a);
TXTR_COORD(0.5 + sa * r2 / dtc, 0.5 + ca * r2 / dtc);
glVertex2f(r2 * sa, r2 * ca);
TXTR_COORD(0.5 + sa * r1 / dtc, 0.5 + ca * r1 / dtc);
glVertex2f(r1 * sa, r1 * ca);
}
glEnd();
}
else {
GLint s;
glBegin(GL_QUAD_STRIP);
for (s = slices; s >= 0; s--) {
GLfloat a;
if (s == slices)
a = 0.0;
else
a = s * da;
sa = sin(a);
ca = cos(a);
TXTR_COORD(0.5 - sa * r2 / dtc, 0.5 + ca * r2 / dtc);
glVertex2f(r2 * sa, r2 * ca);
TXTR_COORD(0.5 - sa * r1 / dtc, 0.5 + ca * r1 / dtc);
glVertex2f(r1 * sa, r1 * ca);
}
glEnd();
}
r1 = r2;
}
break;
}
case GLU_LINE:
{
GLint l, s;
/* draw loops */
for (l = 0; l <= loops; l++) {
GLfloat r = innerRadius + l * dr;
glBegin(GL_LINE_LOOP);
for (s = 0; s < slices; s++) {
GLfloat a = s * da;
glVertex2f(r * sin(a), r * cos(a));
}
glEnd();
}
/* draw spokes */
for (s = 0; s < slices; s++) {
GLfloat a = s * da;
GLfloat x = sin(a);
GLfloat y = cos(a);
glBegin(GL_LINE_STRIP);
for (l = 0; l <= loops; l++) {
GLfloat r = innerRadius + l * dr;
glVertex2f(r * x, r * y);
}
glEnd();
}
break;
}
case GLU_POINT:
{
GLint s;
glBegin(GL_POINTS);
for (s = 0; s < slices; s++) {
GLfloat a = s * da;
GLfloat x = sin(a);
GLfloat y = cos(a);
GLint l;
for (l = 0; l <= loops; l++) {
GLfloat r = innerRadius * l * dr;
glVertex2f(r * x, r * y);
}
}
glEnd();
break;
}
case GLU_SILHOUETTE:
{
if (innerRadius != 0.0) {
GLfloat a;
glBegin(GL_LINE_LOOP);
for (a = 0.0; a < 2.0 * M_PI; a += da) {
GLfloat x = innerRadius * sin(a);
GLfloat y = innerRadius * cos(a);
glVertex2f(x, y);
}
glEnd();
}
{
GLfloat a;
glBegin(GL_LINE_LOOP);
for (a = 0; a < 2.0 * M_PI; a += da) {
GLfloat x = outerRadius * sin(a);
GLfloat y = outerRadius * cos(a);
glVertex2f(x, y);
}
glEnd();
}
break;
}
default:
abort();
}
}

void GLAPIENTRY
gluPartialDisk(GLUquadricObj * qobj, GLdouble innerRadius,
GLdouble outerRadius, GLint slices, GLint loops,
GLdouble startAngle, GLdouble sweepAngle)
{
if (qobj->Normals != GLU_NONE) {
if (qobj->Orientation == GLU_OUTSIDE) {
glNormal3f(0.0, 0.0, +1.0);
}
else {
glNormal3f(0.0, 0.0, -1.0);
}
}

if (qobj->DrawStyle == GLU_POINT) {
GLint loop, slice;
GLdouble radius, delta_radius;
GLdouble angle, delta_angle;
delta_radius = (outerRadius - innerRadius) / (loops - 1);
delta_angle = DEG_TO_RAD((sweepAngle) / (slices - 1));
glBegin(GL_POINTS);
radius = innerRadius;
for (loop = 0; loop < loops; loop++) {
angle = DEG_TO_RAD(startAngle);
for (slice = 0; slice < slices; slice++) {
glVertex2d(radius * sin(angle), radius * cos(angle));
angle += delta_angle;
}
radius += delta_radius;
}
glEnd();
}
else if (qobj->DrawStyle == GLU_LINE) {
GLint loop, slice;
GLdouble radius, delta_radius;
GLdouble angle, delta_angle;
delta_radius = (outerRadius - innerRadius) / loops;
delta_angle = DEG_TO_RAD(sweepAngle / slices);
/* draw rings */
radius = innerRadius;
for (loop = 0; loop < loops; loop++) {
angle = DEG_TO_RAD(startAngle);
glBegin(GL_LINE_STRIP);
for (slice = 0; slice <= slices; slice++) {
glVertex2d(radius * sin(angle), radius * cos(angle));
angle += delta_angle;
}
glEnd();
radius += delta_radius;
}
/* draw spokes */
angle = DEG_TO_RAD(startAngle);
for (slice = 0; slice <= slices; slice++) {
radius = innerRadius;
glBegin(GL_LINE_STRIP);
for (loop = 0; loop < loops; loop++) {
glVertex2d(radius * sin(angle), radius * cos(angle));
radius += delta_radius;
}
glEnd();
angle += delta_angle;
}
}
else if (qobj->DrawStyle == GLU_SILHOUETTE) {
GLint slice;
GLdouble angle, delta_angle;
delta_angle = DEG_TO_RAD(sweepAngle / slices);
/* draw outer ring */
glBegin(GL_LINE_STRIP);
angle = DEG_TO_RAD(startAngle);
for (slice = 0; slice <= slices; slice++) {
glVertex2d(outerRadius * sin(angle), outerRadius * cos(angle));
angle += delta_angle;
}
glEnd();
/* draw inner ring */
if (innerRadius > 0.0) {
glBegin(GL_LINE_STRIP);
angle = DEG_TO_RAD(startAngle);
for (slice = 0; slice < slices; slice++) {
glVertex2d(innerRadius * sin(angle), innerRadius * cos(angle));
angle += delta_angle;
}
glEnd();
}
/* draw spokes */
if (sweepAngle < 360.0) {
GLdouble stopAngle = startAngle + sweepAngle;
glBegin(GL_LINES);
glVertex2d(innerRadius * SIND(startAngle),
innerRadius * COSD(startAngle));
glVertex2d(outerRadius * SIND(startAngle),
outerRadius * COSD(startAngle));
glVertex2d(innerRadius * SIND(stopAngle),
innerRadius * COSD(stopAngle));
glVertex2d(outerRadius * SIND(stopAngle),
outerRadius * COSD(stopAngle));
glEnd();
}
}
else if (qobj->DrawStyle == GLU_FILL) {
GLint loop, slice;
GLdouble radius, delta_radius;
GLdouble angle, delta_angle;
delta_radius = (outerRadius - innerRadius) / loops;
delta_angle = DEG_TO_RAD(sweepAngle / slices);
radius = innerRadius;
for (loop = 0; loop < loops; loop++) {
glBegin(GL_QUAD_STRIP);
angle = DEG_TO_RAD(startAngle);
for (slice = 0; slice <= slices; slice++) {
if (qobj->Orientation == GLU_OUTSIDE) {
glVertex2d((radius + delta_radius) * sin(angle),
(radius + delta_radius) * cos(angle));
glVertex2d(radius * sin(angle), radius * cos(angle));
}
else {
glVertex2d(radius * sin(angle), radius * cos(angle));
glVertex2d((radius + delta_radius) * sin(angle),
(radius + delta_radius) * cos(angle));
}
angle += delta_angle;
}
glEnd();
radius += delta_radius;
}
}
}

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(root)/shark/trunk/ports/mesa/src-glu/quadric.c @ 447 - Rev 55