From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001 From: jtg Date: Thu, 19 Aug 1999 00:55:39 +0000 Subject: Initial revision --- src/glu/mesa/quadric.c | 858 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 858 insertions(+) create mode 100644 src/glu/mesa/quadric.c (limited to 'src/glu/mesa/quadric.c') diff --git a/src/glu/mesa/quadric.c b/src/glu/mesa/quadric.c new file mode 100644 index 00000000000..4698e795b15 --- /dev/null +++ b/src/glu/mesa/quadric.c @@ -0,0 +1,858 @@ +/* $Id: quadric.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.1 + * Copyright (C) 1995-1999 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. + */ + + +/* + * $Log: quadric.c,v $ + * Revision 1.1 1999/08/19 00:55:42 jtg + * Initial revision + * + * Revision 1.19 1999/02/27 13:55:31 brianp + * fixed BeOS-related GLU typedef problems + * + * Revision 1.18 1999/01/03 03:23:15 brianp + * now using GLAPIENTRY and GLCALLBACK keywords (Ted Jump) + * + * Revision 1.17 1999/01/03 03:19:15 brianp + * rewrote some of gluCylinder + * + * Revision 1.16 1998/06/01 01:08:36 brianp + * small update for Next/OpenStep from Alexander Mai + * + * Revision 1.15 1998/03/15 18:28:54 brianp + * reimplemented gluDisk() point and line mode + * + * Revision 1.14 1998/03/15 18:14:17 brianp + * fixed a compiler cast warning + * + * Revision 1.13 1998/02/07 14:28:34 brianp + * another change to gluQuadricCallback(), this time for StormC compiler + * + * Revision 1.12 1998/02/05 00:43:19 brianp + * Yes, still another change to gluQuadricCallback()! + * + * Revision 1.11 1998/02/04 00:27:43 brianp + * yet another change to gluQuadricCallback()! + * + * Revision 1.10 1998/02/04 00:23:23 brianp + * fixed CALLBACK problem in gluQuadricCallback() (Stephane Rehel) + * + * Revision 1.9 1998/02/04 00:20:09 brianp + * added missing (int) in ErrorFunc cast + * + * Revision 1.8 1998/01/16 03:37:51 brianp + * fixed another assignment warning in gluQuadricCallback() + * + * Revision 1.7 1998/01/16 03:35:26 brianp + * fixed Windows compilation warnings (Theodore Jump) + * + * Revision 1.6 1997/10/29 02:02:20 brianp + * various MS Windows compiler changes (David Bucciarelli, v20 3dfx driver) + * + * Revision 1.5 1997/09/17 01:51:48 brianp + * changed glu*Callback() functions to match prototype in glu.h + * + * Revision 1.4 1997/07/24 01:28:44 brianp + * changed precompiled header symbol from PCH to PC_HEADER + * + * Revision 1.3 1997/05/28 02:29:38 brianp + * added support for precompiled headers (PCH), inserted APIENTRY keyword + * + * Revision 1.2 1997/03/12 02:15:38 brianp + * fixed problem in gluPartialDisk() reported by Kenneth H. Carpenter + * + * Revision 1.1 1996/09/27 01:19:39 brianp + * Initial revision + * + */ + + +/* 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 +#include +#include +#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(*)(int))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;iDrawStyle==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;iDrawStyle==GLU_FILL) { + GLfloat ds = 1.0 / slices; + GLfloat dt = 1.0 / stacks; + GLfloat t = 0.0; + z = 0.0; + r = baseRadius; + for (j=0;jNormals==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 ); + TXTR_COORD(0.5,1.0); + 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;iTextureFlag) { + /* draw -Z end as a triangle fan */ + glBegin( GL_TRIANGLE_FAN ); + glNormal3f( 0.0, 0.0, -1.0 ); + TXTR_COORD(0.5,0.0); + 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 ); + TXTR_COORD(s,t); + 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;iDrawStyle==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;iNormals!=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; lOrientation==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; sNormals!=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; loopDrawStyle==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; loopDrawStyle==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; sliceDrawStyle==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; loopOrientation==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; + } + } +} + + + -- cgit v1.2.3