4 * Freeglut geometry rendering methods.
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Fri Dec 3 1999
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #include <GL/freeglut.h>
29 #include "fg_internal.h"
33 * Need more types of polyhedra? See CPolyhedron in MRPT
35 * TODO BEFORE THE STABLE RELEASE:
39 * Following functions have been contributed by Andreas Umbach.
41 * glutWireCube() -- looks OK
42 * glutSolidCube() -- OK
44 * Those functions have been implemented by John Fay.
46 * glutWireTorus() -- looks OK
47 * glutSolidTorus() -- looks OK
48 * glutWireDodecahedron() -- looks OK
49 * glutSolidDodecahedron() -- looks OK
50 * glutWireOctahedron() -- looks OK
51 * glutSolidOctahedron() -- looks OK
52 * glutWireTetrahedron() -- looks OK
53 * glutSolidTetrahedron() -- looks OK
54 * glutWireIcosahedron() -- looks OK
55 * glutSolidIcosahedron() -- looks OK
57 * The Following functions have been updated by Nigel Stewart, based
58 * on FreeGLUT 2.0.0 implementations:
60 * glutWireSphere() -- looks OK
61 * glutSolidSphere() -- looks OK
62 * glutWireCone() -- looks OK
63 * glutSolidCone() -- looks OK
67 /* General function for drawing geometry. As for all geometry we have no
68 * redundancy (or hardly any in the case of cones and cylinders) in terms
69 * of the vertex/normal combinations, we just use glDrawArrays.
70 * useWireMode controls the drawing of solids (false) or wire frame
71 * versions (TRUE) of the geometry you pass
73 static void fghDrawGeometry(GLenum vertexMode, GLdouble *vertices, GLdouble *normals, GLboolean *edgeFlags, GLsizei numVertices, GLboolean useWireMode)
77 glPushAttrib(GL_POLYGON_BIT);
78 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
79 glDisable(GL_CULL_FACE);
84 glEnableClientState(GL_VERTEX_ARRAY);
85 glEnableClientState(GL_NORMAL_ARRAY);
87 glEnableClientState(GL_EDGE_FLAG_ARRAY);
89 glVertexPointer(3, GL_DOUBLE, 0, vertices);
90 glNormalPointer(GL_DOUBLE, 0, normals);
92 glEdgeFlagPointer(0,edgeFlags);
93 glDrawArrays(vertexMode, 0, numVertices);
95 glDisableClientState(GL_VERTEX_ARRAY);
96 glDisableClientState(GL_NORMAL_ARRAY);
98 glDisableClientState(GL_EDGE_FLAG_ARRAY);
104 for(i=0; i<numVertices; i++)
106 glEdgeFlag(edgeFlags[i]);
107 glNormal3dv(normals+i*3);
108 printf("n(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(normals+i*3),*(normals+i*3+1),*(normals+i*3+2));
109 glVertex3dv(vertices+i*3);
110 printf("v(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(vertices+i*3),*(vertices+i*3+1),*(vertices+i*3+2));
121 /* triangle decomposition and associated edgeFlags
122 * be careful to keep winding of all triangles counter-clockwise,
123 * assuming that input has correct winding...
125 static GLubyte vertSamp3[3] = {0,1,2};
126 static GLubyte vertSamp4[6] = {0,1,2, 0,2,3}; /* quad : 4 input vertices, 6 output (2 triangles) */
127 static GLubyte vertSamp5[9] = {0,1,2, 0,2,4, 4,2,3}; /* pentagon: 5 input vertices, 9 output (3 triangles) */
128 static GLboolean edgeFlag3[3] = {1,1,1}; /* triangles remain triangles, all edges are external */
129 static GLboolean edgeFlag4[6] = {1,1,0, 0,1,1};
130 static GLboolean edgeFlag5[9] = {1,1,0, 0,0,1, 0,1,1};
132 static void fghGenerateGeometryWithEdgeFlag(int numFaces, int numEdgePerFaceIn, GLdouble *vertices, GLubyte *vertIndices, GLdouble *normals, GLdouble *vertOut, GLdouble *normOut, GLboolean *edgeFlagsOut)
134 int i,j,numEdgePerFaceOut;
135 GLubyte *vertSamps = NULL;
136 GLboolean *edgeFlags = NULL;
137 switch (numEdgePerFaceIn)
140 vertSamps = vertSamp3;
141 edgeFlags = edgeFlag3;
142 numEdgePerFaceOut = 3; /* 3 output vertices for each face */
145 vertSamps = vertSamp4;
146 edgeFlags = edgeFlag4;
147 numEdgePerFaceOut = 6; /* 6 output vertices for each face */
150 vertSamps = vertSamp5;
151 edgeFlags = edgeFlag5;
152 numEdgePerFaceOut = 9; /* 9 output vertices for each face */
156 * Build array with vertices from vertex coordinates and vertex indices
157 * Do same for normals.
158 * Need to do this because of different normals at shared vertices
159 * (and because normals' coordinates need to be negated).
161 for (i=0; i<numFaces; i++)
164 int faceIdxVertIdx = i*numEdgePerFaceIn; // index to first element of "row" in vertex indices
165 for (j=0; j<numEdgePerFaceOut; j++)
167 int outIdx = i*numEdgePerFaceOut*3+j*3;
168 int vertIdx = vertIndices[faceIdxVertIdx+vertSamps[j]]*3;
170 vertOut[outIdx ] = vertices[vertIdx ];
171 vertOut[outIdx+1] = vertices[vertIdx+1];
172 vertOut[outIdx+2] = vertices[vertIdx+2];
174 normOut[outIdx ] = normals [normIdx ];
175 normOut[outIdx+1] = normals [normIdx+1];
176 normOut[outIdx+2] = normals [normIdx+2];
179 edgeFlagsOut[i*numEdgePerFaceOut+j] = edgeFlags[j];
184 static void fghGenerateGeometry(int numFaces, int numEdgePerFace, GLdouble *vertices, GLubyte *vertIndices, GLdouble *normals, GLdouble *vertOut, GLdouble *normOut)
186 fghGenerateGeometryWithEdgeFlag(numFaces, numEdgePerFace, vertices, vertIndices, normals, vertOut, normOut, NULL);
190 /* -- INTERNAL SETUP OF GEOMETRY --------------------------------------- */
191 /* -- stuff that can be cached -- */
192 /* Cache of input to glDrawArrays */
193 #define DECLARE_SHAPE_CACHE(name,nameICaps,nameCaps)\
194 static GLboolean name##Cached = FALSE;\
195 static GLdouble name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
196 static GLdouble name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
197 static void fgh##nameICaps##Generate()\
199 fghGenerateGeometry(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
200 name##_v, name##_vi, name##_n,\
201 name##_verts, name##_norms);\
203 #define DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(name,nameICaps,nameCaps)\
204 static GLboolean name##Cached = FALSE;\
205 static GLdouble name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
206 static GLdouble name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
207 static GLboolean name##_edgeFlags[nameCaps##_VERT_PER_OBJ_TRI];\
208 static void fgh##nameICaps##Generate()\
210 fghGenerateGeometryWithEdgeFlag(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
211 name##_v, name##_vi, name##_n,\
212 name##_verts, name##_norms, name##_edgeFlags);\
215 * In general, we build arrays with all vertices or normals.
216 * We cant compress this and use glDrawElements as all combinations of
217 * vertex and normals are unique.
221 #define CUBE_NUM_VERT 8
222 #define CUBE_NUM_FACES 6
223 #define CUBE_NUM_EDGE_PER_FACE 4
224 #define CUBE_VERT_PER_OBJ (CUBE_NUM_FACES*CUBE_NUM_EDGE_PER_FACE)
225 #define CUBE_VERT_PER_OBJ_TRI (CUBE_VERT_PER_OBJ+CUBE_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
226 #define CUBE_VERT_ELEM_PER_OBJ (CUBE_VERT_PER_OBJ_TRI*3)
227 /* Vertex Coordinates */
228 static GLdouble cube_v[CUBE_NUM_VERT*3] =
240 static GLdouble cube_n[CUBE_NUM_FACES*3] =
251 static GLubyte cube_vi[CUBE_VERT_PER_OBJ] =
260 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(cube,Cube,CUBE);
262 /* -- Dodecahedron -- */
263 /* Magic Numbers: It is possible to create a dodecahedron by attaching two
264 * pentagons to each face of of a cube. The coordinates of the points are:
265 * (+-x,0, z); (+-1, 1, 1); (0, z, x )
266 * where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
267 * x = 0.61803398875 and z = 1.61803398875.
269 #define DODECAHEDRON_NUM_VERT 20
270 #define DODECAHEDRON_NUM_FACES 12
271 #define DODECAHEDRON_NUM_EDGE_PER_FACE 5
272 #define DODECAHEDRON_VERT_PER_OBJ (DODECAHEDRON_NUM_FACES*DODECAHEDRON_NUM_EDGE_PER_FACE)
273 #define DODECAHEDRON_VERT_PER_OBJ_TRI (DODECAHEDRON_VERT_PER_OBJ+DODECAHEDRON_NUM_FACES*4) /* 4 extra edges per face when drawing pentagons as triangles */
274 #define DODECAHEDRON_VERT_ELEM_PER_OBJ (DODECAHEDRON_VERT_PER_OBJ_TRI*3)
275 /* Vertex Coordinates */
276 static GLdouble dodecahedron_v[DODECAHEDRON_NUM_VERT*3] =
278 0.0 , 1.61803398875, 0.61803398875,
280 -0.61803398875, 0.0 , 1.61803398875,
281 0.61803398875, 0.0 , 1.61803398875,
283 0.0 , 1.61803398875, -0.61803398875,
285 0.61803398875, 0.0 , -1.61803398875,
286 -0.61803398875, 0.0 , -1.61803398875,
288 0.0 , -1.61803398875, 0.61803398875,
291 0.0 , -1.61803398875, -0.61803398875,
294 1.61803398875, -0.61803398875, 0.0 ,
295 1.61803398875, 0.61803398875, 0.0 ,
296 -1.61803398875, 0.61803398875, 0.0 ,
297 -1.61803398875, -0.61803398875, 0.0
300 static GLdouble dodecahedron_n[DODECAHEDRON_NUM_FACES*3] =
302 0.0 , 0.525731112119, 0.850650808354,
303 0.0 , 0.525731112119, -0.850650808354,
304 0.0 , -0.525731112119, 0.850650808354,
305 0.0 , -0.525731112119, -0.850650808354,
307 0.850650808354, 0.0 , 0.525731112119,
308 -0.850650808354, 0.0 , 0.525731112119,
309 0.850650808354, 0.0 , -0.525731112119,
310 -0.850650808354, 0.0 , -0.525731112119,
312 0.525731112119, 0.850650808354, 0.0 ,
313 0.525731112119, -0.850650808354, 0.0 ,
314 -0.525731112119, 0.850650808354, 0.0 ,
315 -0.525731112119, -0.850650808354, 0.0 ,
319 static GLubyte dodecahedron_vi[DODECAHEDRON_VERT_PER_OBJ] =
336 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
339 /* -- Icosahedron -- */
340 #define ICOSAHEDRON_NUM_VERT 12
341 #define ICOSAHEDRON_NUM_FACES 20
342 #define ICOSAHEDRON_NUM_EDGE_PER_FACE 3
343 #define ICOSAHEDRON_VERT_PER_OBJ (ICOSAHEDRON_NUM_FACES*ICOSAHEDRON_NUM_EDGE_PER_FACE)
344 #define ICOSAHEDRON_VERT_PER_OBJ_TRI ICOSAHEDRON_VERT_PER_OBJ
345 #define ICOSAHEDRON_VERT_ELEM_PER_OBJ (ICOSAHEDRON_VERT_PER_OBJ_TRI*3)
346 /* Vertex Coordinates */
347 static GLdouble icosahedron_v[ICOSAHEDRON_NUM_VERT*3] =
350 0.447213595500, 0.894427191000, 0.0 ,
351 0.447213595500, 0.276393202252, 0.850650808354,
352 0.447213595500, -0.723606797748, 0.525731112119,
353 0.447213595500, -0.723606797748, -0.525731112119,
354 0.447213595500, 0.276393202252, -0.850650808354,
355 -0.447213595500, -0.894427191000, 0.0 ,
356 -0.447213595500, -0.276393202252, 0.850650808354,
357 -0.447213595500, 0.723606797748, 0.525731112119,
358 -0.447213595500, 0.723606797748, -0.525731112119,
359 -0.447213595500, -0.276393202252, -0.850650808354,
363 * icosahedron_n[i][0] = ( icosahedron_v[icosahedron_vi[i][1]][1] - icosahedron_v[icosahedron_vi[i][0]][1] ) * ( icosahedron_v[icosahedron_vi[i][2]][2] - icosahedron_v[icosahedron_vi[i][0]][2] ) - ( icosahedron_v[icosahedron_vi[i][1]][2] - icosahedron_v[icosahedron_vi[i][0]][2] ) * ( icosahedron_v[icosahedron_vi[i][2]][1] - icosahedron_v[icosahedron_vi[i][0]][1] ) ;
364 * icosahedron_n[i][1] = ( icosahedron_v[icosahedron_vi[i][1]][2] - icosahedron_v[icosahedron_vi[i][0]][2] ) * ( icosahedron_v[icosahedron_vi[i][2]][0] - icosahedron_v[icosahedron_vi[i][0]][0] ) - ( icosahedron_v[icosahedron_vi[i][1]][0] - icosahedron_v[icosahedron_vi[i][0]][0] ) * ( icosahedron_v[icosahedron_vi[i][2]][2] - icosahedron_v[icosahedron_vi[i][0]][2] ) ;
365 * icosahedron_n[i][2] = ( icosahedron_v[icosahedron_vi[i][1]][0] - icosahedron_v[icosahedron_vi[i][0]][0] ) * ( icosahedron_v[icosahedron_vi[i][2]][1] - icosahedron_v[icosahedron_vi[i][0]][1] ) - ( icosahedron_v[icosahedron_vi[i][1]][1] - icosahedron_v[icosahedron_vi[i][0]][1] ) * ( icosahedron_v[icosahedron_vi[i][2]][0] - icosahedron_v[icosahedron_vi[i][0]][0] ) ;
367 static GLdouble icosahedron_n[ICOSAHEDRON_NUM_FACES*3] =
369 0.760845213037948, 0.470228201835026, 0.341640786498800,
370 0.760845213036861, -0.179611190632978, 0.552786404500000,
371 0.760845213033849, -0.581234022404097, 0,
372 0.760845213036861, -0.179611190632978, -0.552786404500000,
373 0.760845213037948, 0.470228201835026, -0.341640786498800,
374 0.179611190628666, 0.760845213037948, 0.552786404498399,
375 0.179611190634277, -0.290617011204044, 0.894427191000000,
376 0.179611190633958, -0.940456403667806, 0,
377 0.179611190634278, -0.290617011204044, -0.894427191000000,
378 0.179611190628666, 0.760845213037948, -0.552786404498399,
379 -0.179611190633958, 0.940456403667806, 0,
380 -0.179611190634277, 0.290617011204044, 0.894427191000000,
381 -0.179611190628666, -0.760845213037948, 0.552786404498399,
382 -0.179611190628666, -0.760845213037948, -0.552786404498399,
383 -0.179611190634277, 0.290617011204044, -0.894427191000000,
384 -0.760845213036861, 0.179611190632978, -0.552786404500000,
385 -0.760845213033849, 0.581234022404097, 0,
386 -0.760845213036861, 0.179611190632978, 0.552786404500000,
387 -0.760845213037948, -0.470228201835026, 0.341640786498800,
388 -0.760845213037948, -0.470228201835026, -0.341640786498800,
392 static GLubyte icosahedron_vi[ICOSAHEDRON_VERT_PER_OBJ] =
415 DECLARE_SHAPE_CACHE(icosahedron,Icosahedron,ICOSAHEDRON);
417 /* -- Octahedron -- */
418 #define OCTAHEDRON_NUM_VERT 6
419 #define OCTAHEDRON_NUM_FACES 8
420 #define OCTAHEDRON_NUM_EDGE_PER_FACE 3
421 #define OCTAHEDRON_VERT_PER_OBJ (OCTAHEDRON_NUM_FACES*OCTAHEDRON_NUM_EDGE_PER_FACE)
422 #define OCTAHEDRON_VERT_PER_OBJ_TRI OCTAHEDRON_VERT_PER_OBJ
423 #define OCTAHEDRON_VERT_ELEM_PER_OBJ (OCTAHEDRON_VERT_PER_OBJ_TRI*3)
425 /* Vertex Coordinates */
426 static GLdouble octahedron_v[OCTAHEDRON_NUM_VERT*3] =
437 static GLdouble octahedron_n[OCTAHEDRON_NUM_FACES*3] =
439 0.577350269189, 0.577350269189, 0.577350269189, /* sqrt(1/3) */
440 0.577350269189, 0.577350269189,-0.577350269189,
441 0.577350269189,-0.577350269189, 0.577350269189,
442 0.577350269189,-0.577350269189,-0.577350269189,
443 -0.577350269189, 0.577350269189, 0.577350269189,
444 -0.577350269189, 0.577350269189,-0.577350269189,
445 -0.577350269189,-0.577350269189, 0.577350269189,
446 -0.577350269189,-0.577350269189,-0.577350269189
451 static GLubyte octahedron_vi[OCTAHEDRON_VERT_PER_OBJ] =
462 DECLARE_SHAPE_CACHE(octahedron,Octahedron,OCTAHEDRON);
464 /* -- RhombicDodecahedron -- */
465 #define RHOMBICDODECAHEDRON_NUM_VERT 14
466 #define RHOMBICDODECAHEDRON_NUM_FACES 12
467 #define RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE 4
468 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ (RHOMBICDODECAHEDRON_NUM_FACES*RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE)
469 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ_TRI (RHOMBICDODECAHEDRON_VERT_PER_OBJ+RHOMBICDODECAHEDRON_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
470 #define RHOMBICDODECAHEDRON_VERT_ELEM_PER_OBJ (RHOMBICDODECAHEDRON_VERT_PER_OBJ_TRI*3)
472 /* Vertex Coordinates */
473 static GLdouble rhombicdodecahedron_v[RHOMBICDODECAHEDRON_NUM_VERT*3] =
476 0.707106781187, 0.0 , 0.5,
477 0.0 , 0.707106781187, 0.5,
478 -0.707106781187, 0.0 , 0.5,
479 0.0 , -0.707106781187, 0.5,
480 0.707106781187, 0.707106781187, 0.0,
481 -0.707106781187, 0.707106781187, 0.0,
482 -0.707106781187, -0.707106781187, 0.0,
483 0.707106781187, -0.707106781187, 0.0,
484 0.707106781187, 0.0 , -0.5,
485 0.0 , 0.707106781187, -0.5,
486 -0.707106781187, 0.0 , -0.5,
487 0.0 , -0.707106781187, -0.5,
491 static GLdouble rhombicdodecahedron_n[RHOMBICDODECAHEDRON_NUM_FACES*3] =
493 0.353553390594, 0.353553390594, 0.5,
494 -0.353553390594, 0.353553390594, 0.5,
495 -0.353553390594, -0.353553390594, 0.5,
496 0.353553390594, -0.353553390594, 0.5,
501 0.353553390594, 0.353553390594, -0.5,
502 -0.353553390594, 0.353553390594, -0.5,
503 -0.353553390594, -0.353553390594, -0.5,
504 0.353553390594, -0.353553390594, -0.5
508 static GLubyte rhombicdodecahedron_vi[RHOMBICDODECAHEDRON_VERT_PER_OBJ] =
523 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
525 /* -- Tetrahedron -- */
526 /* Magic Numbers: r0 = ( 1, 0, 0 )
527 * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
528 * r2 = ( -1/3, - sqrt(2) / 3, sqrt(6) / 3 )
529 * r3 = ( -1/3, - sqrt(2) / 3, -sqrt(6) / 3 )
530 * |r0| = |r1| = |r2| = |r3| = 1
531 * Distance between any two points is 2 sqrt(6) / 3
533 * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
535 #define TETRAHEDRON_NUM_VERT 4
536 #define TETRAHEDRON_NUM_FACES 4
537 #define TETRAHEDRON_NUM_EDGE_PER_FACE 3
538 #define TETRAHEDRON_VERT_PER_OBJ (TETRAHEDRON_NUM_FACES*TETRAHEDRON_NUM_EDGE_PER_FACE)
539 #define TETRAHEDRON_VERT_PER_OBJ_TRI TETRAHEDRON_VERT_PER_OBJ
540 #define TETRAHEDRON_VERT_ELEM_PER_OBJ (TETRAHEDRON_VERT_PER_OBJ_TRI*3)
542 /* Vertex Coordinates */
543 static GLdouble tetrahedron_v[TETRAHEDRON_NUM_VERT*3] =
546 -0.333333333333, 0.942809041582, 0.0,
547 -0.333333333333, -0.471404520791, 0.816496580928,
548 -0.333333333333, -0.471404520791, -0.816496580928
551 static GLdouble tetrahedron_n[TETRAHEDRON_NUM_FACES*3] =
554 0.333333333333, -0.942809041582, 0.0,
555 0.333333333333, 0.471404520791, -0.816496580928,
556 0.333333333333, 0.471404520791, 0.816496580928
560 static GLubyte tetrahedron_vi[TETRAHEDRON_VERT_PER_OBJ] =
567 DECLARE_SHAPE_CACHE(tetrahedron,Tetrahedron,TETRAHEDRON);
569 /* -- Sierpinski Sponge -- */
570 static unsigned int ipow (int x, unsigned int y)
572 return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2);
575 static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLdouble scale, GLdouble* vertices, GLdouble* normals )
578 if ( numLevels == 0 )
580 for (i=0; i<TETRAHEDRON_NUM_FACES; i++)
583 int faceIdxVertIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE;
584 for (j=0; j<TETRAHEDRON_NUM_EDGE_PER_FACE; j++)
586 int outIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE*3+j*3;
587 int vertIdx = tetrahedron_vi[faceIdxVertIdx+j]*3;
589 vertices[outIdx ] = offset[0] + scale * tetrahedron_v[vertIdx ];
590 vertices[outIdx+1] = offset[1] + scale * tetrahedron_v[vertIdx+1];
591 vertices[outIdx+2] = offset[2] + scale * tetrahedron_v[vertIdx+2];
593 normals [outIdx ] = tetrahedron_n[normIdx ];
594 normals [outIdx+1] = tetrahedron_n[normIdx+1];
595 normals [outIdx+2] = tetrahedron_n[normIdx+2];
599 else if ( numLevels > 0 )
601 GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
602 unsigned int stride = ipow(4,--numLevels)*TETRAHEDRON_VERT_ELEM_PER_OBJ;
604 for ( i = 0 ; i < TETRAHEDRON_NUM_FACES ; i++ )
607 local_offset[0] = offset[0] + scale * tetrahedron_v[idx ];
608 local_offset[1] = offset[1] + scale * tetrahedron_v[idx+1];
609 local_offset[2] = offset[2] + scale * tetrahedron_v[idx+2];
610 fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride );
615 /* -- Now the various shapes involving circles -- */
617 * Compute lookup table of cos and sin values forming a cirle
620 * It is the responsibility of the caller to free these tables
621 * The size of the table is (n+1) to form a connected loop
622 * The last entry is exactly the same as the first
623 * The sign of n can be flipped to get the reverse loop
625 static void fghCircleTable(double **sint,double **cost,const int n)
629 /* Table size, the sign of n flips the circle direction */
631 const int size = abs(n);
633 /* Determine the angle between samples */
635 const double angle = 2*M_PI/(double)( ( n == 0 ) ? 1 : n );
637 /* Allocate memory for n samples, plus duplicate of first entry at the end */
639 *sint = (double *) calloc(sizeof(double), size+1);
640 *cost = (double *) calloc(sizeof(double), size+1);
642 /* Bail out if memory allocation fails, fgError never returns */
644 if (!(*sint) || !(*cost))
648 fgError("Failed to allocate memory in fghCircleTable");
651 /* Compute cos and sin around the circle */
656 for (i=1; i<size; i++)
658 (*sint)[i] = sin(angle*i);
659 (*cost)[i] = cos(angle*i);
662 /* Last sample is duplicate of the first */
664 (*sint)[size] = (*sint)[0];
665 (*cost)[size] = (*cost)[0];
669 /* -- INTERNAL DRAWING functions --------------------------------------- */
670 #define _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,edgeFlags)\
671 static void fgh##nameICaps( GLboolean useWireMode )\
675 fgh##nameICaps##Generate();\
676 name##Cached = GL_TRUE;\
678 fghDrawGeometry(GL_TRIANGLES,name##_verts,name##_norms,edgeFlags,nameCaps##_VERT_PER_OBJ_TRI,useWireMode);\
680 #define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL)
681 #define DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,name##_edgeFlags)
683 static void fghCube( GLdouble dSize, GLboolean useWireMode )
688 cubeCached = GL_TRUE;
695 /* Need to build new vertex list containing vertices for cube of different size */
696 GLdouble *vertices = malloc(CUBE_VERT_ELEM_PER_OBJ * sizeof(GLdouble));
697 /* Bail out if memory allocation fails, fgError never returns */
701 fgError("Failed to allocate memory in fghCube");
703 for (i=0; i<CUBE_VERT_ELEM_PER_OBJ; i++)
704 vertices[i] = dSize*cube_verts[i];
706 fghDrawGeometry(GL_TRIANGLES,vertices ,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,useWireMode);
708 /* cleanup allocated memory */
712 fghDrawGeometry(GL_TRIANGLES,cube_verts,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,useWireMode);
715 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
716 DECLARE_INTERNAL_DRAW(icosahedron,Icosahedron,ICOSAHEDRON);
717 DECLARE_INTERNAL_DRAW(octahedron,Octahedron,OCTAHEDRON);
718 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
719 DECLARE_INTERNAL_DRAW(tetrahedron,Tetrahedron,TETRAHEDRON);
721 static void fghSierpinskiSponge ( int numLevels, GLdouble offset[3], GLdouble scale, GLboolean useWireMode )
725 GLsizei numTetr = numLevels<0? 0 : ipow(4,numLevels); /* No sponge for numLevels below 0 */
726 GLsizei numVert = numTetr*TETRAHEDRON_VERT_PER_OBJ;
730 /* Allocate memory */
731 vertices = malloc(numVert*3 * sizeof(GLdouble));
732 normals = malloc(numVert*3 * sizeof(GLdouble));
733 /* Bail out if memory allocation fails, fgError never returns */
734 if (!vertices || !normals)
738 fgError("Failed to allocate memory in fghSierpinskiSponge");
741 /* Generate elements */
742 fghSierpinskiSpongeGenerate ( numLevels, offset, scale, vertices, normals );
744 /* Draw and cleanup */
745 fghDrawGeometry(GL_TRIANGLES,vertices,normals,NULL,numVert,useWireMode);
752 /* -- INTERFACE FUNCTIONS ---------------------------------------------- */
756 * Draws a solid sphere
758 void FGAPIENTRY glutSolidSphere(GLdouble radius, GLint slices, GLint stacks)
762 /* Adjust z and radius as stacks are drawn. */
767 /* Pre-computed circle */
769 double *sint1,*cost1;
770 double *sint2,*cost2;
772 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
774 fghCircleTable(&sint1,&cost1,-slices);
775 fghCircleTable(&sint2,&cost2,stacks*2);
777 /* The top stack is covered with a triangle fan */
780 z1 = cost2[(stacks>0)?1:0];
782 r1 = sint2[(stacks>0)?1:0];
784 glBegin(GL_TRIANGLE_FAN);
787 glVertex3d(0,0,radius);
789 for (j=slices; j>=0; j--)
791 glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
792 glVertex3d(cost1[j]*r1*radius, sint1[j]*r1*radius, z1*radius);
797 /* Cover each stack with a quad strip, except the top and bottom stacks */
799 for( i=1; i<stacks-1; i++ )
801 z0 = z1; z1 = cost2[i+1];
802 r0 = r1; r1 = sint2[i+1];
804 glBegin(GL_QUAD_STRIP);
806 for(j=0; j<=slices; j++)
808 glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
809 glVertex3d(cost1[j]*r1*radius, sint1[j]*r1*radius, z1*radius);
810 glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
811 glVertex3d(cost1[j]*r0*radius, sint1[j]*r0*radius, z0*radius);
817 /* The bottom stack is covered with a triangle fan */
822 glBegin(GL_TRIANGLE_FAN);
825 glVertex3d(0,0,-radius);
827 for (j=0; j<=slices; j++)
829 glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
830 glVertex3d(cost1[j]*r0*radius, sint1[j]*r0*radius, z0*radius);
835 /* Release sin and cos tables */
844 * Draws a wire sphere
846 void FGAPIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
850 /* Adjust z and radius as stacks and slices are drawn. */
855 /* Pre-computed circle */
857 double *sint1,*cost1;
858 double *sint2,*cost2;
860 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
862 fghCircleTable(&sint1,&cost1,-slices );
863 fghCircleTable(&sint2,&cost2, stacks*2);
865 /* Draw a line loop for each stack */
867 for (i=1; i<stacks; i++)
872 glBegin(GL_LINE_LOOP);
874 for(j=0; j<=slices; j++)
880 glVertex3d(x*r*radius,y*r*radius,z*radius);
886 /* Draw a line loop for each slice */
888 for (i=0; i<slices; i++)
890 glBegin(GL_LINE_STRIP);
892 for(j=0; j<=stacks; j++)
894 x = cost1[i]*sint2[j];
895 y = sint1[i]*sint2[j];
899 glVertex3d(x*radius,y*radius,z*radius);
905 /* Release sin and cos tables */
916 void FGAPIENTRY glutSolidCone( GLdouble base, GLdouble height, GLint slices, GLint stacks )
920 /* Step in z and radius as stacks are drawn. */
925 const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
926 const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
928 /* Scaling factors for vertex normals */
930 const double cosn = ( height / sqrt ( height * height + base * base ));
931 const double sinn = ( base / sqrt ( height * height + base * base ));
933 /* Pre-computed circle */
937 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
939 fghCircleTable(&sint,&cost,-slices);
941 /* Cover the circular base with a triangle fan... */
949 glBegin(GL_TRIANGLE_FAN);
951 glNormal3d(0.0,0.0,-1.0);
952 glVertex3d(0.0,0.0, z0 );
954 for (j=0; j<=slices; j++)
955 glVertex3d(cost[j]*r0, sint[j]*r0, z0);
959 /* Cover each stack with a quad strip, except the top stack */
961 for( i=0; i<stacks-1; i++ )
963 glBegin(GL_QUAD_STRIP);
965 for(j=0; j<=slices; j++)
967 glNormal3d(cost[j]*cosn, sint[j]*cosn, sinn);
968 glVertex3d(cost[j]*r0, sint[j]*r0, z0 );
969 glVertex3d(cost[j]*r1, sint[j]*r1, z1 );
972 z0 = z1; z1 += zStep;
973 r0 = r1; r1 -= rStep;
978 /* The top stack is covered with individual triangles */
980 glBegin(GL_TRIANGLES);
982 glNormal3d(cost[0]*sinn, sint[0]*sinn, cosn);
984 for (j=0; j<slices; j++)
986 glVertex3d(cost[j+0]*r0, sint[j+0]*r0, z0 );
987 glVertex3d(0, 0, height);
988 glNormal3d(cost[j+1]*sinn, sint[j+1]*sinn, cosn );
989 glVertex3d(cost[j+1]*r0, sint[j+1]*r0, z0 );
994 /* Release sin and cos tables */
1003 void FGAPIENTRY glutWireCone( GLdouble base, GLdouble height, GLint slices, GLint stacks)
1007 /* Step in z and radius as stacks are drawn. */
1012 const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
1013 const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
1015 /* Scaling factors for vertex normals */
1017 const double cosn = ( height / sqrt ( height * height + base * base ));
1018 const double sinn = ( base / sqrt ( height * height + base * base ));
1020 /* Pre-computed circle */
1024 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
1026 fghCircleTable(&sint,&cost,-slices);
1028 /* Draw the stacks... */
1030 for (i=0; i<stacks; i++)
1032 glBegin(GL_LINE_LOOP);
1034 for( j=0; j<slices; j++ )
1036 glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn);
1037 glVertex3d(cost[j]*r, sint[j]*r, z );
1046 /* Draw the slices */
1052 for (j=0; j<slices; j++)
1054 glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn );
1055 glVertex3d(cost[j]*r, sint[j]*r, 0.0 );
1056 glVertex3d(0.0, 0.0, height);
1061 /* Release sin and cos tables */
1069 * Draws a solid cylinder
1071 void FGAPIENTRY glutSolidCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
1075 /* Step in z and radius as stacks are drawn. */
1078 const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
1080 /* Pre-computed circle */
1084 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
1086 fghCircleTable(&sint,&cost,-slices);
1088 /* Cover the base and top */
1090 glBegin(GL_TRIANGLE_FAN);
1091 glNormal3d(0.0, 0.0, -1.0 );
1092 glVertex3d(0.0, 0.0, 0.0 );
1093 for (j=0; j<=slices; j++)
1094 glVertex3d(cost[j]*radius, sint[j]*radius, 0.0);
1097 glBegin(GL_TRIANGLE_FAN);
1098 glNormal3d(0.0, 0.0, 1.0 );
1099 glVertex3d(0.0, 0.0, height);
1100 for (j=slices; j>=0; j--)
1101 glVertex3d(cost[j]*radius, sint[j]*radius, height);
1109 for (i=1; i<=stacks; i++)
1114 glBegin(GL_QUAD_STRIP);
1115 for (j=0; j<=slices; j++ )
1117 glNormal3d(cost[j], sint[j], 0.0 );
1118 glVertex3d(cost[j]*radius, sint[j]*radius, z0 );
1119 glVertex3d(cost[j]*radius, sint[j]*radius, z1 );
1123 z0 = z1; z1 += zStep;
1126 /* Release sin and cos tables */
1133 * Draws a wire cylinder
1135 void FGAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
1139 /* Step in z and radius as stacks are drawn. */
1142 const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
1144 /* Pre-computed circle */
1148 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
1150 fghCircleTable(&sint,&cost,-slices);
1152 /* Draw the stacks... */
1154 for (i=0; i<=stacks; i++)
1159 glBegin(GL_LINE_LOOP);
1161 for( j=0; j<slices; j++ )
1163 glNormal3d(cost[j], sint[j], 0.0);
1164 glVertex3d(cost[j]*radius, sint[j]*radius, z );
1172 /* Draw the slices */
1176 for (j=0; j<slices; j++)
1178 glNormal3d(cost[j], sint[j], 0.0 );
1179 glVertex3d(cost[j]*radius, sint[j]*radius, 0.0 );
1180 glVertex3d(cost[j]*radius, sint[j]*radius, height);
1185 /* Release sin and cos tables */
1192 * Draws a wire torus
1194 void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
1196 double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
1197 double *vertex, *normal;
1199 double spsi, cpsi, sphi, cphi ;
1201 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
1203 if ( nSides < 1 ) nSides = 1;
1204 if ( nRings < 1 ) nRings = 1;
1206 /* Allocate the vertices array */
1207 vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
1208 normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
1212 dpsi = 2.0 * M_PI / (double)nRings ;
1213 dphi = -2.0 * M_PI / (double)nSides ;
1216 for( j=0; j<nRings; j++ )
1218 cpsi = cos ( psi ) ;
1219 spsi = sin ( psi ) ;
1222 for( i=0; i<nSides; i++ )
1224 int offset = 3 * ( j * nSides + i ) ;
1225 cphi = cos ( phi ) ;
1226 sphi = sin ( phi ) ;
1227 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1228 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1229 *(vertex + offset + 2) = sphi * iradius ;
1230 *(normal + offset + 0) = cpsi * cphi ;
1231 *(normal + offset + 1) = spsi * cphi ;
1232 *(normal + offset + 2) = sphi ;
1239 for( i=0; i<nSides; i++ )
1241 glBegin( GL_LINE_LOOP );
1243 for( j=0; j<nRings; j++ )
1245 int offset = 3 * ( j * nSides + i ) ;
1246 glNormal3dv( normal + offset );
1247 glVertex3dv( vertex + offset );
1253 for( j=0; j<nRings; j++ )
1255 glBegin(GL_LINE_LOOP);
1257 for( i=0; i<nSides; i++ )
1259 int offset = 3 * ( j * nSides + i ) ;
1260 glNormal3dv( normal + offset );
1261 glVertex3dv( vertex + offset );
1273 * Draws a solid torus
1275 void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
1277 double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
1278 double *vertex, *normal;
1280 double spsi, cpsi, sphi, cphi ;
1282 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
1284 if ( nSides < 1 ) nSides = 1;
1285 if ( nRings < 1 ) nRings = 1;
1287 /* Increment the number of sides and rings to allow for one more point than surface */
1291 /* Allocate the vertices array */
1292 vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
1293 normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
1297 dpsi = 2.0 * M_PI / (double)(nRings - 1) ;
1298 dphi = -2.0 * M_PI / (double)(nSides - 1) ;
1301 for( j=0; j<nRings; j++ )
1303 cpsi = cos ( psi ) ;
1304 spsi = sin ( psi ) ;
1307 for( i=0; i<nSides; i++ )
1309 int offset = 3 * ( j * nSides + i ) ;
1310 cphi = cos ( phi ) ;
1311 sphi = sin ( phi ) ;
1312 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1313 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1314 *(vertex + offset + 2) = sphi * iradius ;
1315 *(normal + offset + 0) = cpsi * cphi ;
1316 *(normal + offset + 1) = spsi * cphi ;
1317 *(normal + offset + 2) = sphi ;
1324 glBegin( GL_QUADS );
1325 for( i=0; i<nSides-1; i++ )
1327 for( j=0; j<nRings-1; j++ )
1329 int offset = 3 * ( j * nSides + i ) ;
1330 glNormal3dv( normal + offset );
1331 glVertex3dv( vertex + offset );
1332 glNormal3dv( normal + offset + 3 );
1333 glVertex3dv( vertex + offset + 3 );
1334 glNormal3dv( normal + offset + 3 * nSides + 3 );
1335 glVertex3dv( vertex + offset + 3 * nSides + 3 );
1336 glNormal3dv( normal + offset + 3 * nSides );
1337 glVertex3dv( vertex + offset + 3 * nSides );
1350 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
1351 /* Macro to generate interface functions */
1352 #define DECLARE_SHAPE_INTERFACE(nameICaps)\
1353 void FGAPIENTRY glutWire##nameICaps( void )\
1355 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWire"#nameICaps );\
1356 fgh##nameICaps( TRUE );\
1358 void FGAPIENTRY glutSolid##nameICaps( void )\
1360 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolid"#nameICaps );\
1361 fgh##nameICaps( FALSE );\
1364 void FGAPIENTRY glutWireCube( GLdouble dSize )
1366 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
1367 fghCube( dSize, TRUE );
1369 void FGAPIENTRY glutSolidCube( GLdouble dSize )
1371 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
1372 fghCube( dSize, FALSE );
1375 DECLARE_SHAPE_INTERFACE(Dodecahedron);
1376 DECLARE_SHAPE_INTERFACE(Icosahedron);
1377 DECLARE_SHAPE_INTERFACE(Octahedron);
1378 DECLARE_SHAPE_INTERFACE(RhombicDodecahedron);
1380 void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
1382 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
1383 fghSierpinskiSponge ( num_levels, offset, scale, TRUE );
1385 void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
1387 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
1388 fghSierpinskiSponge ( num_levels, offset, scale, FALSE );
1391 DECLARE_SHAPE_INTERFACE(Tetrahedron);
1394 /*** END OF FILE ***/