/* $Id: quadric.c,v 1.3 1999/11/11 09:55:39 joukj 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 1.3 1999/11/11 09:55:39 joukj * * tess_macro.h included * * Revision 1.2 1999/11/11 03:21:43 kendallb * * . Updated GL/gl.h with GLCALLACKP and GLAPIENTRYP macros for compatibility * with the IBM VisualAge C++ compiler. Eventually some more code will be * needed in the headers to enable the reversal of (__stdcall*) to (*__stdcall) * for the IBM compilers, however we currently build using our own header files * that already handle this. * * . Changed instances of (GLCALLBACK*) to GLCALLBACKP for compatibility * with the IBM VisualAge C++ compiler in src-glu. * * . Misc cleanups for warnings generated with Watcom C++ in src-glu. Compiles * with 0 warnings now. * * . tess_hash.c: line 244 - Why is this function stubbed out? I removed the * code with a #if 0 to avoid a compiler warning, but it looks dangerous. * * Revision 1.1.1.1 1999/08/19 00:55:42 jtg * Imported sources * * 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" #include "tess_macros.h" #endif /* * 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 (GLCALLBACKP 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 (GLCALLBACKP 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(GLCALLBACKP)(int))fn; #elif defined(__STORM__) qobj->ErrorFunc = (void(GLCALLBACKP)(GLenum))fn; #elif defined(__BEOS__) qobj->ErrorFunc = (void(*)(GLenum))fn; #else qobj->ErrorFunc = (void(GLCALLBACKP)())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; } } }