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"
32 * Need more types of polyhedra? See CPolyhedron in MRPT
36 #ifndef GL_ES_VERSION_2_0
37 /* General functions for drawing geometry
38 * Solids are drawn by glDrawArrays if composed of triangles, or by
39 * glDrawElements if consisting of squares or pentagons that were
40 * decomposed into triangles (some vertices are repeated in that case).
41 * WireFrame drawing will have to be done per face, using GL_LINE_LOOP and
42 * issuing one draw call per face. Always use glDrawArrays as no triangle
43 * decomposition needed. We use the "first" parameter in glDrawArrays to go
46 static void fghDrawGeometryWire(GLfloat *vertices, GLfloat *normals, GLsizei numFaces, GLsizei numEdgePerFace)
50 glEnableClientState(GL_VERTEX_ARRAY);
51 glEnableClientState(GL_NORMAL_ARRAY);
53 glVertexPointer(3, GL_FLOAT, 0, vertices);
54 glNormalPointer(GL_FLOAT, 0, normals);
56 /* Draw per face (TODO: could use glMultiDrawArrays if available) */
57 for (i=0; i<numFaces; i++)
58 glDrawArrays(GL_LINE_LOOP, i*numEdgePerFace, numEdgePerFace);
60 glDisableClientState(GL_VERTEX_ARRAY);
61 glDisableClientState(GL_NORMAL_ARRAY);
63 static void fghDrawGeometrySolid(GLfloat *vertices, GLfloat *normals, GLubyte *vertIdxs, GLsizei numVertices, GLsizei numEdgePerFace)
65 glEnableClientState(GL_VERTEX_ARRAY);
66 glEnableClientState(GL_NORMAL_ARRAY);
68 glVertexPointer(3, GL_FLOAT, 0, vertices);
69 glNormalPointer(GL_FLOAT, 0, normals);
70 if (numEdgePerFace==3)
71 glDrawArrays(GL_TRIANGLES, 0, numVertices);
73 /* The number of elements is passed as numVertices */
74 glDrawElements(GL_TRIANGLES, numVertices, GL_UNSIGNED_BYTE, vertIdxs);
76 glDisableClientState(GL_VERTEX_ARRAY);
77 glDisableClientState(GL_NORMAL_ARRAY);
80 /* Shape decomposition to triangles
81 * We'll use glDrawElements to draw all shapes that are not triangles, so
82 * generate an index vector here, using the below sampling scheme.
83 * Be careful to keep winding of all triangles counter-clockwise,
84 * assuming that input has correct winding...
86 static GLubyte vert4Decomp[6] = {0,1,2, 0,2,3}; /* quad : 4 input vertices, 6 output (2 triangles) */
87 static GLubyte vert5Decomp[9] = {0,1,2, 0,2,4, 4,2,3}; /* pentagon: 5 input vertices, 9 output (3 triangles) */
89 static void fghGenerateGeometryWithIndexArray(int numFaces, int numEdgePerFace, GLfloat *vertices, GLubyte *vertIndices, GLfloat *normals, GLfloat *vertOut, GLfloat *normOut, GLubyte *vertIdxOut)
91 int i,j,numEdgeIdxPerFace;
92 GLubyte *vertSamps = NULL;
93 switch (numEdgePerFace)
96 /* nothing to do here, we'll drawn with glDrawArrays */
99 vertSamps = vert4Decomp;
100 numEdgeIdxPerFace = 6; /* 6 output vertices for each face */
103 vertSamps = vert5Decomp;
104 numEdgeIdxPerFace = 9; /* 9 output vertices for each face */
108 * Build array with vertices using vertex coordinates and vertex indices
109 * Do same for normals.
110 * Need to do this because of different normals at shared vertices.
112 for (i=0; i<numFaces; i++)
115 int faceIdxVertIdx = i*numEdgePerFace; // index to first element of "row" in vertex indices
116 for (j=0; j<numEdgePerFace; j++)
118 int outIdx = i*numEdgePerFace*3+j*3;
119 int vertIdx = vertIndices[faceIdxVertIdx+j]*3;
121 vertOut[outIdx ] = vertices[vertIdx ];
122 vertOut[outIdx+1] = vertices[vertIdx+1];
123 vertOut[outIdx+2] = vertices[vertIdx+2];
125 normOut[outIdx ] = normals [normIdx ];
126 normOut[outIdx+1] = normals [normIdx+1];
127 normOut[outIdx+2] = normals [normIdx+2];
130 /* generate vertex indices for each face */
132 for (j=0; j<numEdgeIdxPerFace; j++)
133 vertIdxOut[i*numEdgeIdxPerFace+j] = faceIdxVertIdx + vertSamps[j];
137 static void fghGenerateGeometry(int numFaces, int numEdgePerFace, GLfloat *vertices, GLubyte *vertIndices, GLfloat *normals, GLfloat *vertOut, GLfloat *normOut)
139 /* This function does the same as fghGenerateGeometryWithIndexArray, just skipping the index array generation... */
140 fghGenerateGeometryWithIndexArray(numFaces, numEdgePerFace, vertices, vertIndices, normals, vertOut, normOut, NULL);
144 /* -- INTERNAL SETUP OF GEOMETRY --------------------------------------- */
145 /* -- stuff that can be cached -- */
146 /* Cache of input to glDrawArrays or glDrawElements
147 * In general, we build arrays with all vertices or normals.
148 * We cant compress this and use glDrawElements as all combinations of
149 * vertex and normals are unique.
151 #define DECLARE_SHAPE_CACHE(name,nameICaps,nameCaps)\
152 static GLboolean name##Cached = FALSE;\
153 static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
154 static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
155 static void fgh##nameICaps##Generate()\
157 fghGenerateGeometry(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
158 name##_v, name##_vi, name##_n,\
159 name##_verts, name##_norms);\
161 #define DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(name,nameICaps,nameCaps)\
162 static GLboolean name##Cached = FALSE;\
163 static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
164 static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
165 static GLubyte name##_vertIdxs[nameCaps##_VERT_PER_OBJ_TRI];\
166 static void fgh##nameICaps##Generate()\
168 fghGenerateGeometryWithIndexArray(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
169 name##_v, name##_vi, name##_n,\
170 name##_verts, name##_norms, name##_vertIdxs);\
174 #define CUBE_NUM_VERT 8
175 #define CUBE_NUM_FACES 6
176 #define CUBE_NUM_EDGE_PER_FACE 4
177 #define CUBE_VERT_PER_OBJ (CUBE_NUM_FACES*CUBE_NUM_EDGE_PER_FACE)
178 #define CUBE_VERT_ELEM_PER_OBJ (CUBE_VERT_PER_OBJ*3)
179 #define CUBE_VERT_PER_OBJ_TRI (CUBE_VERT_PER_OBJ+CUBE_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
180 /* Vertex Coordinates */
181 static GLfloat cube_v[CUBE_NUM_VERT*3] =
193 static GLfloat cube_n[CUBE_NUM_FACES*3] =
203 /* Vertex indices, as quads, before triangulation */
204 static GLubyte cube_vi[CUBE_VERT_PER_OBJ] =
213 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(cube,Cube,CUBE);
215 /* -- Dodecahedron -- */
216 /* Magic Numbers: It is possible to create a dodecahedron by attaching two
217 * pentagons to each face of of a cube. The coordinates of the points are:
218 * (+-x,0, z); (+-1, 1, 1); (0, z, x )
219 * where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
220 * x = 0.61803398875 and z = 1.61803398875.
222 #define DODECAHEDRON_NUM_VERT 20
223 #define DODECAHEDRON_NUM_FACES 12
224 #define DODECAHEDRON_NUM_EDGE_PER_FACE 5
225 #define DODECAHEDRON_VERT_PER_OBJ (DODECAHEDRON_NUM_FACES*DODECAHEDRON_NUM_EDGE_PER_FACE)
226 #define DODECAHEDRON_VERT_ELEM_PER_OBJ (DODECAHEDRON_VERT_PER_OBJ*3)
227 #define DODECAHEDRON_VERT_PER_OBJ_TRI (DODECAHEDRON_VERT_PER_OBJ+DODECAHEDRON_NUM_FACES*4) /* 4 extra edges per face when drawing pentagons as triangles */
228 /* Vertex Coordinates */
229 static GLfloat dodecahedron_v[DODECAHEDRON_NUM_VERT*3] =
231 0.0f, 1.61803398875f, 0.61803398875f,
233 -0.61803398875f, 0.0f, 1.61803398875f,
234 0.61803398875f, 0.0f, 1.61803398875f,
236 0.0f, 1.61803398875f, -0.61803398875f,
238 0.61803398875f, 0.0f, -1.61803398875f,
239 -0.61803398875f, 0.0f, -1.61803398875f,
240 - 1.0f, 1.0f, - 1.0f,
241 0.0f, -1.61803398875f, 0.61803398875f,
243 - 1.0f, - 1.0f, 1.0f,
244 0.0f, -1.61803398875f, -0.61803398875f,
245 - 1.0f, - 1.0f, - 1.0f,
246 1.0f, - 1.0f, - 1.0f,
247 1.61803398875f, -0.61803398875f, 0.0f,
248 1.61803398875f, 0.61803398875f, 0.0f,
249 -1.61803398875f, 0.61803398875f, 0.0f,
250 -1.61803398875f, -0.61803398875f, 0.0f
253 static GLfloat dodecahedron_n[DODECAHEDRON_NUM_FACES*3] =
255 0.0f, 0.525731112119f, 0.850650808354f,
256 0.0f, 0.525731112119f, -0.850650808354f,
257 0.0f, -0.525731112119f, 0.850650808354f,
258 0.0f, -0.525731112119f, -0.850650808354f,
260 0.850650808354f, 0.0f, 0.525731112119f,
261 -0.850650808354f, 0.0f, 0.525731112119f,
262 0.850650808354f, 0.0f, -0.525731112119f,
263 -0.850650808354f, 0.0f, -0.525731112119f,
265 0.525731112119f, 0.850650808354f, 0.0f,
266 0.525731112119f, -0.850650808354f, 0.0f,
267 -0.525731112119f, 0.850650808354f, 0.0f,
268 -0.525731112119f, -0.850650808354f, 0.0f,
272 static GLubyte dodecahedron_vi[DODECAHEDRON_VERT_PER_OBJ] =
289 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
292 /* -- Icosahedron -- */
293 #define ICOSAHEDRON_NUM_VERT 12
294 #define ICOSAHEDRON_NUM_FACES 20
295 #define ICOSAHEDRON_NUM_EDGE_PER_FACE 3
296 #define ICOSAHEDRON_VERT_PER_OBJ (ICOSAHEDRON_NUM_FACES*ICOSAHEDRON_NUM_EDGE_PER_FACE)
297 #define ICOSAHEDRON_VERT_ELEM_PER_OBJ (ICOSAHEDRON_VERT_PER_OBJ*3)
298 #define ICOSAHEDRON_VERT_PER_OBJ_TRI ICOSAHEDRON_VERT_PER_OBJ
299 /* Vertex Coordinates */
300 static GLfloat icosahedron_v[ICOSAHEDRON_NUM_VERT*3] =
303 0.447213595500f, 0.894427191000f, 0.0f,
304 0.447213595500f, 0.276393202252f, 0.850650808354f,
305 0.447213595500f, -0.723606797748f, 0.525731112119f,
306 0.447213595500f, -0.723606797748f, -0.525731112119f,
307 0.447213595500f, 0.276393202252f, -0.850650808354f,
308 -0.447213595500f, -0.894427191000f, 0.0f,
309 -0.447213595500f, -0.276393202252f, 0.850650808354f,
310 -0.447213595500f, 0.723606797748f, 0.525731112119f,
311 -0.447213595500f, 0.723606797748f, -0.525731112119f,
312 -0.447213595500f, -0.276393202252f, -0.850650808354f,
316 * 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] ) ;
317 * 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] ) ;
318 * 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] ) ;
320 static GLfloat icosahedron_n[ICOSAHEDRON_NUM_FACES*3] =
322 0.760845213037948f, 0.470228201835026f, 0.341640786498800f,
323 0.760845213036861f, -0.179611190632978f, 0.552786404500000f,
324 0.760845213033849f, -0.581234022404097f, 0.0f,
325 0.760845213036861f, -0.179611190632978f, -0.552786404500000f,
326 0.760845213037948f, 0.470228201835026f, -0.341640786498800f,
327 0.179611190628666f, 0.760845213037948f, 0.552786404498399f,
328 0.179611190634277f, -0.290617011204044f, 0.894427191000000f,
329 0.179611190633958f, -0.940456403667806f, 0.0f,
330 0.179611190634278f, -0.290617011204044f, -0.894427191000000f,
331 0.179611190628666f, 0.760845213037948f, -0.552786404498399f,
332 -0.179611190633958f, 0.940456403667806f, 0.0f,
333 -0.179611190634277f, 0.290617011204044f, 0.894427191000000f,
334 -0.179611190628666f, -0.760845213037948f, 0.552786404498399f,
335 -0.179611190628666f, -0.760845213037948f, -0.552786404498399f,
336 -0.179611190634277f, 0.290617011204044f, -0.894427191000000f,
337 -0.760845213036861f, 0.179611190632978f, -0.552786404500000f,
338 -0.760845213033849f, 0.581234022404097f, 0.0f,
339 -0.760845213036861f, 0.179611190632978f, 0.552786404500000f,
340 -0.760845213037948f, -0.470228201835026f, 0.341640786498800f,
341 -0.760845213037948f, -0.470228201835026f, -0.341640786498800f,
345 static GLubyte icosahedron_vi[ICOSAHEDRON_VERT_PER_OBJ] =
368 DECLARE_SHAPE_CACHE(icosahedron,Icosahedron,ICOSAHEDRON);
370 /* -- Octahedron -- */
371 #define OCTAHEDRON_NUM_VERT 6
372 #define OCTAHEDRON_NUM_FACES 8
373 #define OCTAHEDRON_NUM_EDGE_PER_FACE 3
374 #define OCTAHEDRON_VERT_PER_OBJ (OCTAHEDRON_NUM_FACES*OCTAHEDRON_NUM_EDGE_PER_FACE)
375 #define OCTAHEDRON_VERT_ELEM_PER_OBJ (OCTAHEDRON_VERT_PER_OBJ*3)
376 #define OCTAHEDRON_VERT_PER_OBJ_TRI OCTAHEDRON_VERT_PER_OBJ
378 /* Vertex Coordinates */
379 static GLfloat octahedron_v[OCTAHEDRON_NUM_VERT*3] =
390 static GLfloat octahedron_n[OCTAHEDRON_NUM_FACES*3] =
392 0.577350269189f, 0.577350269189f, 0.577350269189f, /* sqrt(1/3) */
393 0.577350269189f, 0.577350269189f,-0.577350269189f,
394 0.577350269189f,-0.577350269189f, 0.577350269189f,
395 0.577350269189f,-0.577350269189f,-0.577350269189f,
396 -0.577350269189f, 0.577350269189f, 0.577350269189f,
397 -0.577350269189f, 0.577350269189f,-0.577350269189f,
398 -0.577350269189f,-0.577350269189f, 0.577350269189f,
399 -0.577350269189f,-0.577350269189f,-0.577350269189f
404 static GLubyte octahedron_vi[OCTAHEDRON_VERT_PER_OBJ] =
415 DECLARE_SHAPE_CACHE(octahedron,Octahedron,OCTAHEDRON);
417 /* -- RhombicDodecahedron -- */
418 #define RHOMBICDODECAHEDRON_NUM_VERT 14
419 #define RHOMBICDODECAHEDRON_NUM_FACES 12
420 #define RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE 4
421 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ (RHOMBICDODECAHEDRON_NUM_FACES*RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE)
422 #define RHOMBICDODECAHEDRON_VERT_ELEM_PER_OBJ (RHOMBICDODECAHEDRON_VERT_PER_OBJ*3)
423 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ_TRI (RHOMBICDODECAHEDRON_VERT_PER_OBJ+RHOMBICDODECAHEDRON_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
425 /* Vertex Coordinates */
426 static GLfloat rhombicdodecahedron_v[RHOMBICDODECAHEDRON_NUM_VERT*3] =
429 0.707106781187f, 0.0f, 0.5f,
430 0.0f, 0.707106781187f, 0.5f,
431 -0.707106781187f, 0.0f, 0.5f,
432 0.0f, -0.707106781187f, 0.5f,
433 0.707106781187f, 0.707106781187f, 0.0f,
434 -0.707106781187f, 0.707106781187f, 0.0f,
435 -0.707106781187f, -0.707106781187f, 0.0f,
436 0.707106781187f, -0.707106781187f, 0.0f,
437 0.707106781187f, 0.0f, -0.5f,
438 0.0f, 0.707106781187f, -0.5f,
439 -0.707106781187f, 0.0f, -0.5f,
440 0.0f, -0.707106781187f, -0.5f,
444 static GLfloat rhombicdodecahedron_n[RHOMBICDODECAHEDRON_NUM_FACES*3] =
446 0.353553390594f, 0.353553390594f, 0.5f,
447 -0.353553390594f, 0.353553390594f, 0.5f,
448 -0.353553390594f, -0.353553390594f, 0.5f,
449 0.353553390594f, -0.353553390594f, 0.5f,
454 0.353553390594f, 0.353553390594f, -0.5f,
455 -0.353553390594f, 0.353553390594f, -0.5f,
456 -0.353553390594f, -0.353553390594f, -0.5f,
457 0.353553390594f, -0.353553390594f, -0.5f
461 static GLubyte rhombicdodecahedron_vi[RHOMBICDODECAHEDRON_VERT_PER_OBJ] =
476 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
478 /* -- Tetrahedron -- */
479 /* Magic Numbers: r0 = ( 1, 0, 0 )
480 * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
481 * r2 = ( -1/3, - sqrt(2) / 3, sqrt(6) / 3 )
482 * r3 = ( -1/3, - sqrt(2) / 3, -sqrt(6) / 3 )
483 * |r0| = |r1| = |r2| = |r3| = 1
484 * Distance between any two points is 2 sqrt(6) / 3
486 * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
488 #define TETRAHEDRON_NUM_VERT 4
489 #define TETRAHEDRON_NUM_FACES 4
490 #define TETRAHEDRON_NUM_EDGE_PER_FACE 3
491 #define TETRAHEDRON_VERT_PER_OBJ (TETRAHEDRON_NUM_FACES*TETRAHEDRON_NUM_EDGE_PER_FACE)
492 #define TETRAHEDRON_VERT_ELEM_PER_OBJ (TETRAHEDRON_VERT_PER_OBJ*3)
493 #define TETRAHEDRON_VERT_PER_OBJ_TRI TETRAHEDRON_VERT_PER_OBJ
495 /* Vertex Coordinates */
496 static GLfloat tetrahedron_v[TETRAHEDRON_NUM_VERT*3] =
499 -0.333333333333f, 0.942809041582f, 0.0f,
500 -0.333333333333f, -0.471404520791f, 0.816496580928f,
501 -0.333333333333f, -0.471404520791f, -0.816496580928f
504 static GLfloat tetrahedron_n[TETRAHEDRON_NUM_FACES*3] =
507 0.333333333333f, -0.942809041582f, 0.0f,
508 0.333333333333f, 0.471404520791f, -0.816496580928f,
509 0.333333333333f, 0.471404520791f, 0.816496580928f
513 static GLubyte tetrahedron_vi[TETRAHEDRON_VERT_PER_OBJ] =
520 DECLARE_SHAPE_CACHE(tetrahedron,Tetrahedron,TETRAHEDRON);
522 /* -- Sierpinski Sponge -- */
523 static unsigned int ipow (int x, unsigned int y)
525 return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2);
528 static void fghSierpinskiSpongeGenerate ( int numLevels, double offset[3], GLfloat scale, GLfloat* vertices, GLfloat* normals )
531 if ( numLevels == 0 )
533 for (i=0; i<TETRAHEDRON_NUM_FACES; i++)
536 int faceIdxVertIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE;
537 for (j=0; j<TETRAHEDRON_NUM_EDGE_PER_FACE; j++)
539 int outIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE*3+j*3;
540 int vertIdx = tetrahedron_vi[faceIdxVertIdx+j]*3;
542 vertices[outIdx ] = (GLfloat)offset[0] + scale * tetrahedron_v[vertIdx ];
543 vertices[outIdx+1] = (GLfloat)offset[1] + scale * tetrahedron_v[vertIdx+1];
544 vertices[outIdx+2] = (GLfloat)offset[2] + scale * tetrahedron_v[vertIdx+2];
546 normals [outIdx ] = tetrahedron_n[normIdx ];
547 normals [outIdx+1] = tetrahedron_n[normIdx+1];
548 normals [outIdx+2] = tetrahedron_n[normIdx+2];
552 else if ( numLevels > 0 )
554 double local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
555 unsigned int stride = ipow(4,--numLevels)*TETRAHEDRON_VERT_ELEM_PER_OBJ;
557 for ( i = 0 ; i < TETRAHEDRON_NUM_FACES ; i++ )
560 local_offset[0] = offset[0] + scale * tetrahedron_v[idx ];
561 local_offset[1] = offset[1] + scale * tetrahedron_v[idx+1];
562 local_offset[2] = offset[2] + scale * tetrahedron_v[idx+2];
563 fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride );
568 /* -- Now the various shapes involving circles -- */
570 * Compute lookup table of cos and sin values forming a circle
571 * (or half circle if halfCircle==TRUE)
574 * It is the responsibility of the caller to free these tables
575 * The size of the table is (n+1) to form a connected loop
576 * The last entry is exactly the same as the first
577 * The sign of n can be flipped to get the reverse loop
579 static void fghCircleTable(GLfloat **sint, GLfloat **cost, const int n, const GLboolean halfCircle)
583 /* Table size, the sign of n flips the circle direction */
584 const int size = abs(n);
586 /* Determine the angle between samples */
587 const GLfloat angle = (halfCircle?1:2)*(GLfloat)M_PI/(GLfloat)( ( n == 0 ) ? 1 : n );
589 /* Allocate memory for n samples, plus duplicate of first entry at the end */
590 *sint = malloc(sizeof(GLfloat) * (size+1));
591 *cost = malloc(sizeof(GLfloat) * (size+1));
593 /* Bail out if memory allocation fails, fgError never returns */
594 if (!(*sint) || !(*cost))
598 fgError("Failed to allocate memory in fghCircleTable");
601 /* Compute cos and sin around the circle */
605 for (i=1; i<size; i++)
607 (*sint)[i] = sinf(angle*i);
608 (*cost)[i] = cosf(angle*i);
614 (*sint)[size] = 0.0f; /* sin PI */
615 (*cost)[size] = -1.0f; /* cos PI */
619 /* Last sample is duplicate of the first (sin or cos of 2 PI) */
620 (*sint)[size] = (*sint)[0];
621 (*cost)[size] = (*cost)[0];
626 /* -- INTERNAL DRAWING functions --------------------------------------- */
627 #define _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,vertIdxs)\
628 static void fgh##nameICaps( GLboolean useWireMode )\
632 fgh##nameICaps##Generate();\
633 name##Cached = GL_TRUE;\
638 fghDrawGeometryWire (name##_verts,name##_norms,\
639 nameCaps##_NUM_FACES,nameCaps##_NUM_EDGE_PER_FACE);\
643 fghDrawGeometrySolid(name##_verts,name##_norms,vertIdxs,\
644 nameCaps##_VERT_PER_OBJ_TRI, nameCaps##_NUM_EDGE_PER_FACE);\
647 #define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL)
648 #define DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,name##_vertIdxs)
650 static void fghCube( GLfloat dSize, GLboolean useWireMode )
657 cubeCached = GL_TRUE;
662 /* Need to build new vertex list containing vertices for cube of different size */
665 vertices = malloc(CUBE_VERT_ELEM_PER_OBJ * sizeof(GLfloat));
667 /* Bail out if memory allocation fails, fgError never returns */
671 fgError("Failed to allocate memory in fghCube");
674 for (i=0; i<CUBE_VERT_ELEM_PER_OBJ; i++)
675 vertices[i] = dSize*cube_verts[i];
678 vertices = cube_verts;
681 fghDrawGeometryWire (vertices,cube_norms, CUBE_NUM_FACES,CUBE_NUM_EDGE_PER_FACE);
683 fghDrawGeometrySolid(vertices,cube_norms,cube_vertIdxs,CUBE_VERT_PER_OBJ_TRI, CUBE_NUM_EDGE_PER_FACE);
686 /* cleanup allocated memory */
690 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
691 DECLARE_INTERNAL_DRAW(icosahedron,Icosahedron,ICOSAHEDRON);
692 DECLARE_INTERNAL_DRAW(octahedron,Octahedron,OCTAHEDRON);
693 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
694 DECLARE_INTERNAL_DRAW(tetrahedron,Tetrahedron,TETRAHEDRON);
696 static void fghSierpinskiSponge ( int numLevels, double offset[3], GLfloat scale, GLboolean useWireMode )
700 GLsizei numTetr = numLevels<0? 0 : ipow(4,numLevels); /* No sponge for numLevels below 0 */
701 GLsizei numVert = numTetr*TETRAHEDRON_VERT_PER_OBJ;
702 GLsizei numFace = numTetr*TETRAHEDRON_NUM_FACES;
706 /* Allocate memory */
707 vertices = malloc(numVert*3 * sizeof(GLfloat));
708 normals = malloc(numVert*3 * sizeof(GLfloat));
709 /* Bail out if memory allocation fails, fgError never returns */
710 if (!vertices || !normals)
714 fgError("Failed to allocate memory in fghSierpinskiSponge");
717 /* Generate elements */
718 fghSierpinskiSpongeGenerate ( numLevels, offset, scale, vertices, normals );
720 /* Draw and cleanup */
722 fghDrawGeometryWire (vertices,normals, numFace,TETRAHEDRON_NUM_EDGE_PER_FACE);
724 fghDrawGeometrySolid(vertices,normals,NULL,numVert, TETRAHEDRON_NUM_EDGE_PER_FACE);
730 #endif /* GL_ES_VERSION_2_0 */
733 /* -- INTERFACE FUNCTIONS ---------------------------------------------- */
736 #ifndef EGL_VERSION_1_0
738 * Draws a solid sphere
740 void FGAPIENTRY glutSolidSphere(double radius, GLint slices, GLint stacks)
744 /* Adjust z and radius as stacks are drawn. */
745 GLfloat radf = (GLfloat)radius;
749 /* Pre-computed circle */
751 GLfloat *sint1,*cost1;
752 GLfloat *sint2,*cost2;
754 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
756 fghCircleTable(&sint1,&cost1,-slices,FALSE);
757 fghCircleTable(&sint2,&cost2, stacks,TRUE);
759 /* The top stack is covered with a triangle fan */
762 z1 = cost2[(stacks>0)?1:0];
764 r1 = sint2[(stacks>0)?1:0];
766 glBegin(GL_TRIANGLE_FAN);
769 glVertex3f(0,0,radf);
771 for (j=slices; j>=0; j--)
773 glNormal3f(cost1[j]*r1, sint1[j]*r1, z1 );
774 glVertex3f(cost1[j]*r1*radf, sint1[j]*r1*radf, z1*radf);
779 /* Cover each stack with a quad strip, except the top and bottom stacks */
781 for( i=1; i<stacks-1; i++ )
783 z0 = z1; z1 = cost2[i+1];
784 r0 = r1; r1 = sint2[i+1];
786 glBegin(GL_QUAD_STRIP);
788 for(j=0; j<=slices; j++)
790 glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
791 glVertex3d(cost1[j]*r1*radf, sint1[j]*r1*radf, z1*radf);
792 glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
793 glVertex3d(cost1[j]*r0*radf, sint1[j]*r0*radf, z0*radf);
799 /* The bottom stack is covered with a triangle fan */
804 glBegin(GL_TRIANGLE_FAN);
807 glVertex3d(0,0,-radius);
809 for (j=0; j<=slices; j++)
811 glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
812 glVertex3d(cost1[j]*r0*radf, sint1[j]*r0*radf, z0*radf);
817 /* Release sin and cos tables */
826 * Draws a wire sphere
828 void FGAPIENTRY glutWireSphere(double radius, GLint slices, GLint stacks)
832 /* Adjust z and radius as stacks and slices are drawn. */
833 GLfloat radf = (GLfloat)radius;
837 /* Pre-computed circle */
839 GLfloat *sint1,*cost1;
840 GLfloat *sint2,*cost2;
842 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
844 fghCircleTable(&sint1,&cost1,-slices,FALSE);
845 fghCircleTable(&sint2,&cost2, stacks,TRUE);
847 /* Draw a line loop for each stack */
849 for (i=1; i<stacks; i++)
854 glBegin(GL_LINE_LOOP);
856 for(j=0; j<=slices; j++)
862 glVertex3f(x*r*radf,y*r*radf,z*radf);
868 /* Draw a line loop for each slice */
870 for (i=0; i<slices; i++)
872 glBegin(GL_LINE_STRIP);
874 for(j=0; j<=stacks; j++)
876 x = cost1[i]*sint2[j];
877 y = sint1[i]*sint2[j];
881 glVertex3f(x*radf,y*radf,z*radf);
887 /* Release sin and cos tables */
898 void FGAPIENTRY glutSolidCone( double base, double height, GLint slices, GLint stacks )
902 /* Step in z and radius as stacks are drawn. */
907 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
908 const GLfloat rStep = (GLfloat)base / ( ( stacks > 0 ) ? stacks : 1 );
910 /* Scaling factors for vertex normals */
912 const GLfloat cosn = ( (GLfloat)height / sqrtf( height * height + base * base ));
913 const GLfloat sinn = ( (GLfloat)base / sqrtf( height * height + base * base ));
915 /* Pre-computed circle */
919 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
921 fghCircleTable(&sint,&cost,-slices,FALSE);
923 /* Cover the circular base with a triangle fan... */
931 glBegin(GL_TRIANGLE_FAN);
934 glVertex3f(0,0, z0 );
936 for (j=0; j<=slices; j++)
937 glVertex3f(cost[j]*r0, sint[j]*r0, z0);
941 /* Cover each stack with a quad strip, except the top stack */
943 for( i=0; i<stacks-1; i++ )
945 glBegin(GL_QUAD_STRIP);
947 for(j=0; j<=slices; j++)
949 glNormal3f(cost[j]*cosn, sint[j]*cosn, sinn);
950 glVertex3f(cost[j]*r0, sint[j]*r0, z0 );
951 glVertex3f(cost[j]*r1, sint[j]*r1, z1 );
954 z0 = z1; z1 += zStep;
955 r0 = r1; r1 -= rStep;
960 /* The top stack is covered with individual triangles */
962 glBegin(GL_TRIANGLES);
964 glNormal3f(cost[0]*sinn, sint[0]*sinn, cosn);
966 for (j=0; j<slices; j++)
968 glVertex3f(cost[j+0]*r0, sint[j+0]*r0, z0 );
969 glVertex3f(0, 0, (GLfloat)height);
970 glNormal3f(cost[j+1]*sinn, sint[j+1]*sinn, cosn );
971 glVertex3f(cost[j+1]*r0, sint[j+1]*r0, z0 );
976 /* Release sin and cos tables */
985 void FGAPIENTRY glutWireCone( double base, double height, GLint slices, GLint stacks)
989 /* Step in z and radius as stacks are drawn. */
992 GLfloat r = (GLfloat)base;
994 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
995 const GLfloat rStep = (GLfloat)base / ( ( stacks > 0 ) ? stacks : 1 );
997 /* Scaling factors for vertex normals */
999 const GLfloat cosn = ( (GLfloat)height / sqrtf( height * height + base * base ));
1000 const GLfloat sinn = ( (GLfloat)base / sqrtf( height * height + base * base ));
1002 /* Pre-computed circle */
1004 GLfloat *sint,*cost;
1006 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
1008 fghCircleTable(&sint,&cost,-slices,FALSE);
1010 /* Draw the stacks... */
1012 for (i=0; i<stacks; i++)
1014 glBegin(GL_LINE_LOOP);
1016 for( j=0; j<slices; j++ )
1018 glNormal3f(cost[j]*sinn, sint[j]*sinn, cosn);
1019 glVertex3f(cost[j]*r, sint[j]*r, z );
1028 /* Draw the slices */
1034 for (j=0; j<slices; j++)
1036 glNormal3f(cost[j]*sinn, sint[j]*sinn, cosn );
1037 glVertex3f(cost[j]*r, sint[j]*r, 0 );
1038 glVertex3f(0, 0, (GLfloat)height);
1043 /* Release sin and cos tables */
1051 * Draws a solid cylinder
1053 void FGAPIENTRY glutSolidCylinder(double radius, double height, GLint slices, GLint stacks)
1057 /* Step in z and radius as stacks are drawn. */
1058 GLfloat radf = (GLfloat)radius;
1060 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1062 /* Pre-computed circle */
1064 GLfloat *sint,*cost;
1066 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
1068 fghCircleTable(&sint,&cost,-slices,FALSE);
1070 /* Cover the base and top */
1072 glBegin(GL_TRIANGLE_FAN);
1073 glNormal3f(0, 0, -1 );
1074 glVertex3f(0, 0, 0 );
1075 for (j=0; j<=slices; j++)
1076 glVertex3f(cost[j]*radf, sint[j]*radf, 0);
1079 glBegin(GL_TRIANGLE_FAN);
1080 glNormal3f(0, 0, 1 );
1081 glVertex3f(0, 0, (GLfloat)height);
1082 for (j=slices; j>=0; j--)
1083 glVertex3f(cost[j]*radf, sint[j]*radf, (GLfloat)height);
1091 for (i=1; i<=stacks; i++)
1094 z1 = (GLfloat)height;
1096 glBegin(GL_QUAD_STRIP);
1097 for (j=0; j<=slices; j++ )
1099 glNormal3f(cost[j], sint[j], 0 );
1100 glVertex3f(cost[j]*radf, sint[j]*radf, z0 );
1101 glVertex3f(cost[j]*radf, sint[j]*radf, z1 );
1105 z0 = z1; z1 += zStep;
1108 /* Release sin and cos tables */
1115 * Draws a wire cylinder
1117 void FGAPIENTRY glutWireCylinder(double radius, double height, GLint slices, GLint stacks)
1121 /* Step in z and radius as stacks are drawn. */
1122 GLfloat radf = (GLfloat)radius;
1124 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1126 /* Pre-computed circle */
1128 GLfloat *sint,*cost;
1130 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
1132 fghCircleTable(&sint,&cost,-slices,FALSE);
1134 /* Draw the stacks... */
1136 for (i=0; i<=stacks; i++)
1139 z = (GLfloat)height;
1141 glBegin(GL_LINE_LOOP);
1143 for( j=0; j<slices; j++ )
1145 glNormal3f(cost[j], sint[j], 0);
1146 glVertex3f(cost[j]*radf, sint[j]*radf, z);
1154 /* Draw the slices */
1158 for (j=0; j<slices; j++)
1160 glNormal3f(cost[j], sint[j], 0 );
1161 glVertex3f(cost[j]*radf, sint[j]*radf, 0 );
1162 glVertex3f(cost[j]*radf, sint[j]*radf, (GLfloat)height);
1167 /* Release sin and cos tables */
1174 * Draws a wire torus
1176 void FGAPIENTRY glutWireTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
1178 GLfloat iradius = (float)dInnerRadius, oradius = (float)dOuterRadius;
1179 GLfloat phi, psi, dpsi, dphi;
1180 GLfloat *vertex, *normal;
1182 GLfloat spsi, cpsi, sphi, cphi ;
1184 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
1186 if ( nSides < 1 ) nSides = 1;
1187 if ( nRings < 1 ) nRings = 1;
1189 /* Allocate the vertices array */
1190 vertex = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1191 normal = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1195 dpsi = 2.0f * (GLfloat)M_PI / (GLfloat)(nRings) ;
1196 dphi = -2.0f * (GLfloat)M_PI / (GLfloat)(nSides) ;
1199 for( j=0; j<nRings; j++ )
1201 cpsi = cosf( psi ) ;
1202 spsi = sinf( psi ) ;
1205 for( i=0; i<nSides; i++ )
1207 int offset = 3 * ( j * nSides + i ) ;
1208 cphi = cosf( phi ) ;
1209 sphi = sinf( phi ) ;
1210 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1211 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1212 *(vertex + offset + 2) = sphi * iradius ;
1213 *(normal + offset + 0) = cpsi * cphi ;
1214 *(normal + offset + 1) = spsi * cphi ;
1215 *(normal + offset + 2) = sphi ;
1222 for( i=0; i<nSides; i++ )
1224 glBegin( GL_LINE_LOOP );
1226 for( j=0; j<nRings; j++ )
1228 int offset = 3 * ( j * nSides + i ) ;
1229 glNormal3fv( normal + offset );
1230 glVertex3fv( vertex + offset );
1236 for( j=0; j<nRings; j++ )
1238 glBegin(GL_LINE_LOOP);
1240 for( i=0; i<nSides; i++ )
1242 int offset = 3 * ( j * nSides + i ) ;
1243 glNormal3fv( normal + offset );
1244 glVertex3fv( vertex + offset );
1256 * Draws a solid torus
1258 void FGAPIENTRY glutSolidTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
1260 GLfloat iradius = (float)dInnerRadius, oradius = (float)dOuterRadius;
1261 GLfloat phi, psi, dpsi, dphi;
1262 GLfloat *vertex, *normal;
1264 GLfloat spsi, cpsi, sphi, cphi ;
1266 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
1268 if ( nSides < 1 ) nSides = 1;
1269 if ( nRings < 1 ) nRings = 1;
1271 /* Increment the number of sides and rings to allow for one more point than surface */
1275 /* Allocate the vertices array */
1276 vertex = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1277 normal = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1281 dpsi = 2.0f * (GLfloat)M_PI / (GLfloat)(nRings - 1) ;
1282 dphi = -2.0f * (GLfloat)M_PI / (GLfloat)(nSides - 1) ;
1285 for( j=0; j<nRings; j++ )
1287 cpsi = cosf( psi ) ;
1288 spsi = sinf( psi ) ;
1291 for( i=0; i<nSides; i++ )
1293 int offset = 3 * ( j * nSides + i ) ;
1294 cphi = cosf( phi ) ;
1295 sphi = sinf( phi ) ;
1296 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1297 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1298 *(vertex + offset + 2) = sphi * iradius ;
1299 *(normal + offset + 0) = cpsi * cphi ;
1300 *(normal + offset + 1) = spsi * cphi ;
1301 *(normal + offset + 2) = sphi ;
1308 glBegin( GL_QUADS );
1309 for( i=0; i<nSides-1; i++ )
1311 for( j=0; j<nRings-1; j++ )
1313 int offset = 3 * ( j * nSides + i ) ;
1314 glNormal3fv( normal + offset );
1315 glVertex3fv( vertex + offset );
1316 glNormal3fv( normal + offset + 3 );
1317 glVertex3fv( vertex + offset + 3 );
1318 glNormal3fv( normal + offset + 3 * nSides + 3 );
1319 glVertex3fv( vertex + offset + 3 * nSides + 3 );
1320 glNormal3fv( normal + offset + 3 * nSides );
1321 glVertex3fv( vertex + offset + 3 * nSides );
1331 #endif /* EGL_VERSION_1_0 */
1335 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
1336 /* Macro to generate interface functions */
1337 #define DECLARE_SHAPE_INTERFACE(nameICaps)\
1338 void FGAPIENTRY glutWire##nameICaps( void )\
1340 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWire"#nameICaps );\
1341 fgh##nameICaps( TRUE );\
1343 void FGAPIENTRY glutSolid##nameICaps( void )\
1345 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolid"#nameICaps );\
1346 fgh##nameICaps( FALSE );\
1349 void FGAPIENTRY glutWireCube( double dSize )
1351 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
1352 fghCube( (GLfloat)dSize, TRUE );
1354 void FGAPIENTRY glutSolidCube( double dSize )
1356 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
1357 fghCube( (GLfloat)dSize, FALSE );
1360 DECLARE_SHAPE_INTERFACE(Dodecahedron);
1361 DECLARE_SHAPE_INTERFACE(Icosahedron);
1362 DECLARE_SHAPE_INTERFACE(Octahedron);
1363 DECLARE_SHAPE_INTERFACE(RhombicDodecahedron);
1365 void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, double offset[3], double scale )
1367 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
1368 fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, TRUE );
1370 void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, double offset[3], double scale )
1372 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
1373 fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, FALSE );
1376 DECLARE_SHAPE_INTERFACE(Tetrahedron);
1379 /*** END OF FILE ***/