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"
34 * Need more types of polyhedra? See CPolyhedron in MRPT
38 /* General functions for drawing geometry
39 * Solids are drawn by glDrawArrays if composed of triangles, or by
40 * glDrawElements if consisting of squares or pentagons that were
41 * decomposed into triangles (some vertices are repeated in that case).
42 * WireFrame drawing will have to be done per face, using GL_LINE_LOOP and
43 * issuing one draw call per face. Always use glDrawArrays as no triangle
44 * decomposition needed. We use the "first" parameter in glDrawArrays to go
48 /* Version for OpenGL (ES) 1.1 */
49 #ifndef GL_ES_VERSION_2_0
50 static void fghDrawGeometryWire11(GLfloat *vertices, GLfloat *normals, GLsizei numFaces, GLsizei numEdgePerFace)
54 glEnableClientState(GL_VERTEX_ARRAY);
55 glEnableClientState(GL_NORMAL_ARRAY);
57 glVertexPointer(3, GL_FLOAT, 0, vertices);
58 glNormalPointer(GL_FLOAT, 0, normals);
60 /* Draw per face (TODO: could use glMultiDrawArrays if available) */
61 for (i=0; i<numFaces; i++)
62 glDrawArrays(GL_LINE_LOOP, i*numEdgePerFace, numEdgePerFace);
64 glDisableClientState(GL_VERTEX_ARRAY);
65 glDisableClientState(GL_NORMAL_ARRAY);
69 /* Version for OpenGL (ES) >= 2.0 */
70 static void fghDrawGeometryWire20(GLfloat *vertices, GLfloat *normals, GLsizei numFaces, GLsizei numEdgePerFace,
71 GLint attribute_v_coord, GLint attribute_v_normal)
73 GLuint vbo_coords, vbo_normals;
74 GLuint numVertices = numFaces * numEdgePerFace;
78 if (numVertices > 0 && attribute_v_coord != -1) {
79 fghGenBuffers(1, &vbo_coords);
80 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
81 fghBufferData(FGH_ARRAY_BUFFER, numVertices * 3 * sizeof(vertices[0]),
82 vertices, FGH_STATIC_DRAW);
85 if (numVertices > 0 && attribute_v_normal != -1) {
86 fghGenBuffers(1, &vbo_normals);
87 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_normals);
88 fghBufferData(FGH_ARRAY_BUFFER, numVertices * 3 * sizeof(normals[0]),
89 normals, FGH_STATIC_DRAW);
93 fghEnableVertexAttribArray(attribute_v_coord);
94 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
95 fghVertexAttribPointer(
96 attribute_v_coord, // attribute
97 3, // number of elements per vertex, here (x,y,z)
98 GL_FLOAT, // the type of each element
99 GL_FALSE, // take our values as-is
100 0, // no extra data between each position
101 0 // offset of first element
106 fghEnableVertexAttribArray(attribute_v_normal);
107 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_normals);
108 fghVertexAttribPointer(
109 attribute_v_normal, // attribute
110 3, // number of elements per vertex, here (x,y,z)
111 GL_FLOAT, // the type of each element
112 GL_FALSE, // take our values as-is
113 0, // no extra data between each position
114 0 // offset of first element
118 /* Draw per face (TODO: could use glMultiDrawArrays if available) */
119 for (i=0; i<numFaces; i++)
120 glDrawArrays(GL_LINE_LOOP, i*numEdgePerFace, numEdgePerFace);
124 fghDisableVertexAttribArray(attribute_v_coord);
125 if (vbo_normals != 0)
126 fghDisableVertexAttribArray(attribute_v_normal);
129 fghDeleteBuffers(1, &vbo_coords);
130 if (vbo_normals != 0)
131 fghDeleteBuffers(1, &vbo_normals);
134 static void fghDrawGeometryWire(GLfloat *vertices, GLfloat *normals, GLsizei numFaces, GLsizei numEdgePerFace)
136 GLint attribute_v_coord = fgStructure.CurrentWindow->Window.attribute_v_coord;
137 GLint attribute_v_normal = fgStructure.CurrentWindow->Window.attribute_v_normal;
139 if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
140 /* User requested a 2.0 draw */
141 fghDrawGeometryWire20(vertices, normals, numFaces, numEdgePerFace,
142 attribute_v_coord, attribute_v_normal);
143 #ifndef GL_ES_VERSION_2_0
145 fghDrawGeometryWire11(vertices, normals, numFaces, numEdgePerFace);
150 /* Draw the geometric shape with filled triangles
152 * - If the shape is naturally triangulated (numEdgePerFace==3), each
153 * vertex+normal pair is used only once, so no vertex indices.
155 * - If the shape was triangulated (DECOMPOSE_TO_TRIANGLE), some
156 * vertex+normal pairs are reused, so use vertex indices.
159 /* Version for OpenGL (ES) 1.1 */
160 #ifndef GL_ES_VERSION_2_0
161 static void fghDrawGeometrySolid11(GLfloat *vertices, GLfloat *normals, GLubyte *vertIdxs,
162 GLsizei numVertices, GLsizei numVertIdxs)
164 glEnableClientState(GL_VERTEX_ARRAY);
165 glEnableClientState(GL_NORMAL_ARRAY);
167 glVertexPointer(3, GL_FLOAT, 0, vertices);
168 glNormalPointer(GL_FLOAT, 0, normals);
169 if (vertIdxs == NULL)
170 glDrawArrays(GL_TRIANGLES, 0, numVertices);
172 glDrawElements(GL_TRIANGLES, numVertIdxs, GL_UNSIGNED_BYTE, vertIdxs);
174 glDisableClientState(GL_VERTEX_ARRAY);
175 glDisableClientState(GL_NORMAL_ARRAY);
179 /* Version for OpenGL (ES) >= 2.0 */
180 static void fghDrawGeometrySolid20(GLfloat *vertices, GLfloat *normals, GLubyte *vertIdxs,
181 GLsizei numVertices, GLsizei numVertIdxs,
182 GLint attribute_v_coord, GLint attribute_v_normal)
184 GLuint vbo_coords, vbo_normals, ibo_elements;
186 if (numVertices > 0 && attribute_v_coord != -1) {
187 fghGenBuffers(1, &vbo_coords);
188 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
189 fghBufferData(FGH_ARRAY_BUFFER, numVertices * 3 * sizeof(vertices[0]),
190 vertices, FGH_STATIC_DRAW);
193 if (numVertices > 0 && attribute_v_normal != -1) {
194 fghGenBuffers(1, &vbo_normals);
195 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_normals);
196 fghBufferData(FGH_ARRAY_BUFFER, numVertices * 3 * sizeof(normals[0]),
197 normals, FGH_STATIC_DRAW);
200 if (vertIdxs != NULL) {
201 fghGenBuffers(1, &ibo_elements);
202 fghBindBuffer(FGH_ELEMENT_ARRAY_BUFFER, ibo_elements);
203 fghBufferData(FGH_ELEMENT_ARRAY_BUFFER, numVertIdxs * sizeof(vertIdxs[0]),
204 vertIdxs, FGH_STATIC_DRAW);
208 fghEnableVertexAttribArray(attribute_v_coord);
209 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
210 fghVertexAttribPointer(
211 attribute_v_coord, // attribute
212 3, // number of elements per vertex, here (x,y,z)
213 GL_FLOAT, // the type of each element
214 GL_FALSE, // take our values as-is
215 0, // no extra data between each position
216 0 // offset of first element
221 fghEnableVertexAttribArray(attribute_v_normal);
222 fghBindBuffer(FGH_ARRAY_BUFFER, vbo_normals);
223 fghVertexAttribPointer(
224 attribute_v_normal, // attribute
225 3, // number of elements per vertex, here (x,y,z)
226 GL_FLOAT, // the type of each element
227 GL_FALSE, // take our values as-is
228 0, // no extra data between each position
229 0 // offset of first element
233 if (vertIdxs == NULL) {
234 glDrawArrays(GL_TRIANGLES, 0, numVertices);
236 fghBindBuffer(FGH_ELEMENT_ARRAY_BUFFER, ibo_elements);
237 glDrawElements(GL_TRIANGLES, numVertIdxs, GL_UNSIGNED_BYTE, 0);
241 fghDisableVertexAttribArray(attribute_v_coord);
242 if (vbo_normals != 0)
243 fghDisableVertexAttribArray(attribute_v_normal);
246 fghDeleteBuffers(1, &vbo_coords);
247 if (vbo_normals != 0)
248 fghDeleteBuffers(1, &vbo_normals);
249 if (ibo_elements != 0)
250 fghDeleteBuffers(1, &ibo_elements);
253 static void fghDrawGeometrySolid(GLfloat *vertices, GLfloat *normals, GLubyte *vertIdxs,
254 GLsizei numVertices, GLsizei numVertIdxs)
256 GLint attribute_v_coord = fgStructure.CurrentWindow->Window.attribute_v_coord;
257 GLint attribute_v_normal = fgStructure.CurrentWindow->Window.attribute_v_normal;
259 if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
260 /* User requested a 2.0 draw */
261 fghDrawGeometrySolid20(vertices, normals, vertIdxs,
262 numVertices, numVertIdxs,
263 attribute_v_coord, attribute_v_normal);
264 #ifndef GL_ES_VERSION_2_0
266 fghDrawGeometrySolid11(vertices, normals, vertIdxs,
267 numVertices, numVertIdxs);
271 /* Shape decomposition to triangles
272 * We'll use glDrawElements to draw all shapes that are not naturally
273 * composed of triangles, so generate an index vector here, using the
274 * below sampling scheme.
275 * Be careful to keep winding of all triangles counter-clockwise,
276 * assuming that input has correct winding...
278 static GLubyte vert4Decomp[6] = {0,1,2, 0,2,3}; /* quad : 4 input vertices, 6 output (2 triangles) */
279 static GLubyte vert5Decomp[9] = {0,1,2, 0,2,4, 4,2,3}; /* pentagon: 5 input vertices, 9 output (3 triangles) */
281 static void fghGenerateGeometryWithIndexArray(int numFaces, int numEdgePerFace, GLfloat *vertices, GLubyte *vertIndices, GLfloat *normals, GLfloat *vertOut, GLfloat *normOut, GLubyte *vertIdxOut)
283 int i,j,numEdgeIdxPerFace;
284 GLubyte *vertSamps = NULL;
285 switch (numEdgePerFace)
288 /* nothing to do here, we'll draw with glDrawArrays */
291 vertSamps = vert4Decomp;
292 numEdgeIdxPerFace = 6; /* 6 output vertices for each face */
295 vertSamps = vert5Decomp;
296 numEdgeIdxPerFace = 9; /* 9 output vertices for each face */
300 * Build array with vertices using vertex coordinates and vertex indices
301 * Do same for normals.
302 * Need to do this because of different normals at shared vertices.
304 for (i=0; i<numFaces; i++)
307 int faceIdxVertIdx = i*numEdgePerFace; // index to first element of "row" in vertex indices
308 for (j=0; j<numEdgePerFace; j++)
310 int outIdx = i*numEdgePerFace*3+j*3;
311 int vertIdx = vertIndices[faceIdxVertIdx+j]*3;
313 vertOut[outIdx ] = vertices[vertIdx ];
314 vertOut[outIdx+1] = vertices[vertIdx+1];
315 vertOut[outIdx+2] = vertices[vertIdx+2];
317 normOut[outIdx ] = normals [normIdx ];
318 normOut[outIdx+1] = normals [normIdx+1];
319 normOut[outIdx+2] = normals [normIdx+2];
322 /* generate vertex indices for each face */
324 for (j=0; j<numEdgeIdxPerFace; j++)
325 vertIdxOut[i*numEdgeIdxPerFace+j] = faceIdxVertIdx + vertSamps[j];
329 static void fghGenerateGeometry(int numFaces, int numEdgePerFace, GLfloat *vertices, GLubyte *vertIndices, GLfloat *normals, GLfloat *vertOut, GLfloat *normOut)
331 /* This function does the same as fghGenerateGeometryWithIndexArray, just skipping the index array generation... */
332 fghGenerateGeometryWithIndexArray(numFaces, numEdgePerFace, vertices, vertIndices, normals, vertOut, normOut, NULL);
336 /* -- INTERNAL SETUP OF GEOMETRY --------------------------------------- */
337 /* -- stuff that can be cached -- */
338 /* Cache of input to glDrawArrays or glDrawElements
339 * In general, we build arrays with all vertices or normals.
340 * We cant compress this and use glDrawElements as all combinations of
341 * vertices and normals are unique.
343 #define DECLARE_SHAPE_CACHE(name,nameICaps,nameCaps)\
344 static GLboolean name##Cached = FALSE;\
345 static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
346 static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
347 static void fgh##nameICaps##Generate()\
349 fghGenerateGeometry(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
350 name##_v, name##_vi, name##_n,\
351 name##_verts, name##_norms);\
353 #define DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(name,nameICaps,nameCaps)\
354 static GLboolean name##Cached = FALSE;\
355 static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
356 static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
357 static GLubyte name##_vertIdxs[nameCaps##_VERT_PER_OBJ_TRI];\
358 static void fgh##nameICaps##Generate()\
360 fghGenerateGeometryWithIndexArray(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
361 name##_v, name##_vi, name##_n,\
362 name##_verts, name##_norms, name##_vertIdxs);\
366 #define CUBE_NUM_VERT 8
367 #define CUBE_NUM_FACES 6
368 #define CUBE_NUM_EDGE_PER_FACE 4
369 #define CUBE_VERT_PER_OBJ (CUBE_NUM_FACES*CUBE_NUM_EDGE_PER_FACE)
370 #define CUBE_VERT_ELEM_PER_OBJ (CUBE_VERT_PER_OBJ*3)
371 #define CUBE_VERT_PER_OBJ_TRI (CUBE_VERT_PER_OBJ+CUBE_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
372 /* Vertex Coordinates */
373 static GLfloat cube_v[CUBE_NUM_VERT*3] =
385 static GLfloat cube_n[CUBE_NUM_FACES*3] =
395 /* Vertex indices, as quads, before triangulation */
396 static GLubyte cube_vi[CUBE_VERT_PER_OBJ] =
405 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(cube,Cube,CUBE);
407 /* -- Dodecahedron -- */
408 /* Magic Numbers: It is possible to create a dodecahedron by attaching two
409 * pentagons to each face of of a cube. The coordinates of the points are:
410 * (+-x,0, z); (+-1, 1, 1); (0, z, x )
411 * where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
412 * x = 0.61803398875 and z = 1.61803398875.
414 #define DODECAHEDRON_NUM_VERT 20
415 #define DODECAHEDRON_NUM_FACES 12
416 #define DODECAHEDRON_NUM_EDGE_PER_FACE 5
417 #define DODECAHEDRON_VERT_PER_OBJ (DODECAHEDRON_NUM_FACES*DODECAHEDRON_NUM_EDGE_PER_FACE)
418 #define DODECAHEDRON_VERT_ELEM_PER_OBJ (DODECAHEDRON_VERT_PER_OBJ*3)
419 #define DODECAHEDRON_VERT_PER_OBJ_TRI (DODECAHEDRON_VERT_PER_OBJ+DODECAHEDRON_NUM_FACES*4) /* 4 extra edges per face when drawing pentagons as triangles */
420 /* Vertex Coordinates */
421 static GLfloat dodecahedron_v[DODECAHEDRON_NUM_VERT*3] =
423 0.0f, 1.61803398875f, 0.61803398875f,
425 -0.61803398875f, 0.0f, 1.61803398875f,
426 0.61803398875f, 0.0f, 1.61803398875f,
428 0.0f, 1.61803398875f, -0.61803398875f,
430 0.61803398875f, 0.0f, -1.61803398875f,
431 -0.61803398875f, 0.0f, -1.61803398875f,
432 - 1.0f, 1.0f, - 1.0f,
433 0.0f, -1.61803398875f, 0.61803398875f,
435 - 1.0f, - 1.0f, 1.0f,
436 0.0f, -1.61803398875f, -0.61803398875f,
437 - 1.0f, - 1.0f, - 1.0f,
438 1.0f, - 1.0f, - 1.0f,
439 1.61803398875f, -0.61803398875f, 0.0f,
440 1.61803398875f, 0.61803398875f, 0.0f,
441 -1.61803398875f, 0.61803398875f, 0.0f,
442 -1.61803398875f, -0.61803398875f, 0.0f
445 static GLfloat dodecahedron_n[DODECAHEDRON_NUM_FACES*3] =
447 0.0f, 0.525731112119f, 0.850650808354f,
448 0.0f, 0.525731112119f, -0.850650808354f,
449 0.0f, -0.525731112119f, 0.850650808354f,
450 0.0f, -0.525731112119f, -0.850650808354f,
452 0.850650808354f, 0.0f, 0.525731112119f,
453 -0.850650808354f, 0.0f, 0.525731112119f,
454 0.850650808354f, 0.0f, -0.525731112119f,
455 -0.850650808354f, 0.0f, -0.525731112119f,
457 0.525731112119f, 0.850650808354f, 0.0f,
458 0.525731112119f, -0.850650808354f, 0.0f,
459 -0.525731112119f, 0.850650808354f, 0.0f,
460 -0.525731112119f, -0.850650808354f, 0.0f,
464 static GLubyte dodecahedron_vi[DODECAHEDRON_VERT_PER_OBJ] =
481 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
484 /* -- Icosahedron -- */
485 #define ICOSAHEDRON_NUM_VERT 12
486 #define ICOSAHEDRON_NUM_FACES 20
487 #define ICOSAHEDRON_NUM_EDGE_PER_FACE 3
488 #define ICOSAHEDRON_VERT_PER_OBJ (ICOSAHEDRON_NUM_FACES*ICOSAHEDRON_NUM_EDGE_PER_FACE)
489 #define ICOSAHEDRON_VERT_ELEM_PER_OBJ (ICOSAHEDRON_VERT_PER_OBJ*3)
490 #define ICOSAHEDRON_VERT_PER_OBJ_TRI ICOSAHEDRON_VERT_PER_OBJ
491 /* Vertex Coordinates */
492 static GLfloat icosahedron_v[ICOSAHEDRON_NUM_VERT*3] =
495 0.447213595500f, 0.894427191000f, 0.0f,
496 0.447213595500f, 0.276393202252f, 0.850650808354f,
497 0.447213595500f, -0.723606797748f, 0.525731112119f,
498 0.447213595500f, -0.723606797748f, -0.525731112119f,
499 0.447213595500f, 0.276393202252f, -0.850650808354f,
500 -0.447213595500f, -0.894427191000f, 0.0f,
501 -0.447213595500f, -0.276393202252f, 0.850650808354f,
502 -0.447213595500f, 0.723606797748f, 0.525731112119f,
503 -0.447213595500f, 0.723606797748f, -0.525731112119f,
504 -0.447213595500f, -0.276393202252f, -0.850650808354f,
508 * 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] ) ;
509 * 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] ) ;
510 * 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] ) ;
512 static GLfloat icosahedron_n[ICOSAHEDRON_NUM_FACES*3] =
514 0.760845213037948f, 0.470228201835026f, 0.341640786498800f,
515 0.760845213036861f, -0.179611190632978f, 0.552786404500000f,
516 0.760845213033849f, -0.581234022404097f, 0.0f,
517 0.760845213036861f, -0.179611190632978f, -0.552786404500000f,
518 0.760845213037948f, 0.470228201835026f, -0.341640786498800f,
519 0.179611190628666f, 0.760845213037948f, 0.552786404498399f,
520 0.179611190634277f, -0.290617011204044f, 0.894427191000000f,
521 0.179611190633958f, -0.940456403667806f, 0.0f,
522 0.179611190634278f, -0.290617011204044f, -0.894427191000000f,
523 0.179611190628666f, 0.760845213037948f, -0.552786404498399f,
524 -0.179611190633958f, 0.940456403667806f, 0.0f,
525 -0.179611190634277f, 0.290617011204044f, 0.894427191000000f,
526 -0.179611190628666f, -0.760845213037948f, 0.552786404498399f,
527 -0.179611190628666f, -0.760845213037948f, -0.552786404498399f,
528 -0.179611190634277f, 0.290617011204044f, -0.894427191000000f,
529 -0.760845213036861f, 0.179611190632978f, -0.552786404500000f,
530 -0.760845213033849f, 0.581234022404097f, 0.0f,
531 -0.760845213036861f, 0.179611190632978f, 0.552786404500000f,
532 -0.760845213037948f, -0.470228201835026f, 0.341640786498800f,
533 -0.760845213037948f, -0.470228201835026f, -0.341640786498800f,
537 static GLubyte icosahedron_vi[ICOSAHEDRON_VERT_PER_OBJ] =
560 DECLARE_SHAPE_CACHE(icosahedron,Icosahedron,ICOSAHEDRON);
562 /* -- Octahedron -- */
563 #define OCTAHEDRON_NUM_VERT 6
564 #define OCTAHEDRON_NUM_FACES 8
565 #define OCTAHEDRON_NUM_EDGE_PER_FACE 3
566 #define OCTAHEDRON_VERT_PER_OBJ (OCTAHEDRON_NUM_FACES*OCTAHEDRON_NUM_EDGE_PER_FACE)
567 #define OCTAHEDRON_VERT_ELEM_PER_OBJ (OCTAHEDRON_VERT_PER_OBJ*3)
568 #define OCTAHEDRON_VERT_PER_OBJ_TRI OCTAHEDRON_VERT_PER_OBJ
570 /* Vertex Coordinates */
571 static GLfloat octahedron_v[OCTAHEDRON_NUM_VERT*3] =
582 static GLfloat octahedron_n[OCTAHEDRON_NUM_FACES*3] =
584 0.577350269189f, 0.577350269189f, 0.577350269189f, /* sqrt(1/3) */
585 0.577350269189f, 0.577350269189f,-0.577350269189f,
586 0.577350269189f,-0.577350269189f, 0.577350269189f,
587 0.577350269189f,-0.577350269189f,-0.577350269189f,
588 -0.577350269189f, 0.577350269189f, 0.577350269189f,
589 -0.577350269189f, 0.577350269189f,-0.577350269189f,
590 -0.577350269189f,-0.577350269189f, 0.577350269189f,
591 -0.577350269189f,-0.577350269189f,-0.577350269189f
596 static GLubyte octahedron_vi[OCTAHEDRON_VERT_PER_OBJ] =
607 DECLARE_SHAPE_CACHE(octahedron,Octahedron,OCTAHEDRON);
609 /* -- RhombicDodecahedron -- */
610 #define RHOMBICDODECAHEDRON_NUM_VERT 14
611 #define RHOMBICDODECAHEDRON_NUM_FACES 12
612 #define RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE 4
613 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ (RHOMBICDODECAHEDRON_NUM_FACES*RHOMBICDODECAHEDRON_NUM_EDGE_PER_FACE)
614 #define RHOMBICDODECAHEDRON_VERT_ELEM_PER_OBJ (RHOMBICDODECAHEDRON_VERT_PER_OBJ*3)
615 #define RHOMBICDODECAHEDRON_VERT_PER_OBJ_TRI (RHOMBICDODECAHEDRON_VERT_PER_OBJ+RHOMBICDODECAHEDRON_NUM_FACES*2) /* 2 extra edges per face when drawing quads as triangles */
617 /* Vertex Coordinates */
618 static GLfloat rhombicdodecahedron_v[RHOMBICDODECAHEDRON_NUM_VERT*3] =
621 0.707106781187f, 0.0f, 0.5f,
622 0.0f, 0.707106781187f, 0.5f,
623 -0.707106781187f, 0.0f, 0.5f,
624 0.0f, -0.707106781187f, 0.5f,
625 0.707106781187f, 0.707106781187f, 0.0f,
626 -0.707106781187f, 0.707106781187f, 0.0f,
627 -0.707106781187f, -0.707106781187f, 0.0f,
628 0.707106781187f, -0.707106781187f, 0.0f,
629 0.707106781187f, 0.0f, -0.5f,
630 0.0f, 0.707106781187f, -0.5f,
631 -0.707106781187f, 0.0f, -0.5f,
632 0.0f, -0.707106781187f, -0.5f,
636 static GLfloat rhombicdodecahedron_n[RHOMBICDODECAHEDRON_NUM_FACES*3] =
638 0.353553390594f, 0.353553390594f, 0.5f,
639 -0.353553390594f, 0.353553390594f, 0.5f,
640 -0.353553390594f, -0.353553390594f, 0.5f,
641 0.353553390594f, -0.353553390594f, 0.5f,
646 0.353553390594f, 0.353553390594f, -0.5f,
647 -0.353553390594f, 0.353553390594f, -0.5f,
648 -0.353553390594f, -0.353553390594f, -0.5f,
649 0.353553390594f, -0.353553390594f, -0.5f
653 static GLubyte rhombicdodecahedron_vi[RHOMBICDODECAHEDRON_VERT_PER_OBJ] =
668 DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
670 /* -- Tetrahedron -- */
671 /* Magic Numbers: r0 = ( 1, 0, 0 )
672 * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
673 * r2 = ( -1/3, - sqrt(2) / 3, sqrt(6) / 3 )
674 * r3 = ( -1/3, - sqrt(2) / 3, -sqrt(6) / 3 )
675 * |r0| = |r1| = |r2| = |r3| = 1
676 * Distance between any two points is 2 sqrt(6) / 3
678 * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
680 #define TETRAHEDRON_NUM_VERT 4
681 #define TETRAHEDRON_NUM_FACES 4
682 #define TETRAHEDRON_NUM_EDGE_PER_FACE 3
683 #define TETRAHEDRON_VERT_PER_OBJ (TETRAHEDRON_NUM_FACES*TETRAHEDRON_NUM_EDGE_PER_FACE)
684 #define TETRAHEDRON_VERT_ELEM_PER_OBJ (TETRAHEDRON_VERT_PER_OBJ*3)
685 #define TETRAHEDRON_VERT_PER_OBJ_TRI TETRAHEDRON_VERT_PER_OBJ
687 /* Vertex Coordinates */
688 static GLfloat tetrahedron_v[TETRAHEDRON_NUM_VERT*3] =
691 -0.333333333333f, 0.942809041582f, 0.0f,
692 -0.333333333333f, -0.471404520791f, 0.816496580928f,
693 -0.333333333333f, -0.471404520791f, -0.816496580928f
696 static GLfloat tetrahedron_n[TETRAHEDRON_NUM_FACES*3] =
699 0.333333333333f, -0.942809041582f, 0.0f,
700 0.333333333333f, 0.471404520791f, -0.816496580928f,
701 0.333333333333f, 0.471404520791f, 0.816496580928f
705 static GLubyte tetrahedron_vi[TETRAHEDRON_VERT_PER_OBJ] =
712 DECLARE_SHAPE_CACHE(tetrahedron,Tetrahedron,TETRAHEDRON);
714 /* -- Sierpinski Sponge -- */
715 static unsigned int ipow (int x, unsigned int y)
717 return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2);
720 static void fghSierpinskiSpongeGenerate ( int numLevels, double offset[3], GLfloat scale, GLfloat* vertices, GLfloat* normals )
723 if ( numLevels == 0 )
725 for (i=0; i<TETRAHEDRON_NUM_FACES; i++)
728 int faceIdxVertIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE;
729 for (j=0; j<TETRAHEDRON_NUM_EDGE_PER_FACE; j++)
731 int outIdx = i*TETRAHEDRON_NUM_EDGE_PER_FACE*3+j*3;
732 int vertIdx = tetrahedron_vi[faceIdxVertIdx+j]*3;
734 vertices[outIdx ] = (GLfloat)offset[0] + scale * tetrahedron_v[vertIdx ];
735 vertices[outIdx+1] = (GLfloat)offset[1] + scale * tetrahedron_v[vertIdx+1];
736 vertices[outIdx+2] = (GLfloat)offset[2] + scale * tetrahedron_v[vertIdx+2];
738 normals [outIdx ] = tetrahedron_n[normIdx ];
739 normals [outIdx+1] = tetrahedron_n[normIdx+1];
740 normals [outIdx+2] = tetrahedron_n[normIdx+2];
744 else if ( numLevels > 0 )
746 double local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
747 unsigned int stride = ipow(4,--numLevels)*TETRAHEDRON_VERT_ELEM_PER_OBJ;
749 for ( i = 0 ; i < TETRAHEDRON_NUM_FACES ; i++ )
752 local_offset[0] = offset[0] + scale * tetrahedron_v[idx ];
753 local_offset[1] = offset[1] + scale * tetrahedron_v[idx+1];
754 local_offset[2] = offset[2] + scale * tetrahedron_v[idx+2];
755 fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride );
760 /* -- Now the various shapes involving circles -- */
762 * Compute lookup table of cos and sin values forming a circle
763 * (or half circle if halfCircle==TRUE)
766 * It is the responsibility of the caller to free these tables
767 * The size of the table is (n+1) to form a connected loop
768 * The last entry is exactly the same as the first
769 * The sign of n can be flipped to get the reverse loop
771 static void fghCircleTable(GLfloat **sint, GLfloat **cost, const int n, const GLboolean halfCircle)
775 /* Table size, the sign of n flips the circle direction */
776 const int size = abs(n);
778 /* Determine the angle between samples */
779 const GLfloat angle = (halfCircle?1:2)*(GLfloat)M_PI/(GLfloat)( ( n == 0 ) ? 1 : n );
781 /* Allocate memory for n samples, plus duplicate of first entry at the end */
782 *sint = malloc(sizeof(GLfloat) * (size+1));
783 *cost = malloc(sizeof(GLfloat) * (size+1));
785 /* Bail out if memory allocation fails, fgError never returns */
786 if (!(*sint) || !(*cost))
790 fgError("Failed to allocate memory in fghCircleTable");
793 /* Compute cos and sin around the circle */
797 for (i=1; i<size; i++)
800 (*sint)[i] = sinf(angle*i);
801 (*cost)[i] = cosf(angle*i);
803 (*sint)[i] = (float)sin((double)(angle*i));
804 (*cost)[i] = (float)cos((double)(angle*i));
805 #endif /* __cplusplus */
811 (*sint)[size] = 0.0f; /* sin PI */
812 (*cost)[size] = -1.0f; /* cos PI */
816 /* Last sample is duplicate of the first (sin or cos of 2 PI) */
817 (*sint)[size] = (*sint)[0];
818 (*cost)[size] = (*cost)[0];
822 static void fghGenerateSphere(GLfloat radius, GLint slices, GLint stacks, GLfloat **vertices, GLfloat **normals, int* nVert)
825 int idx = 0; /* idx into vertex/normal buffer */
828 /* Pre-computed circle */
829 GLfloat *sint1,*cost1;
830 GLfloat *sint2,*cost2;
832 /* number of unique vertices */
833 if (slices==0 || stacks<2)
835 /* nothing to generate */
839 *nVert = slices*(stacks-1)+2;
841 /* precompute values on unit circle */
842 fghCircleTable(&sint1,&cost1,-slices,FALSE);
843 fghCircleTable(&sint2,&cost2, stacks,TRUE);
845 /* Allocate vertex and normal buffers, bail out if memory allocation fails */
846 *vertices = malloc((*nVert)*3*sizeof(GLfloat));
847 *normals = malloc((*nVert)*3*sizeof(GLfloat));
848 if (!(vertices) || !(normals))
852 fgError("Failed to allocate memory in fghGenerateSphere");
856 (*vertices)[0] = 0.f;
857 (*vertices)[1] = 0.f;
858 (*vertices)[2] = radius;
859 (*normals )[0] = 0.f;
860 (*normals )[1] = 0.f;
861 (*normals )[2] = 1.f;
865 for( i=1; i<stacks; i++ )
867 for(j=0; j<slices; j++, idx+=3)
869 x = cost1[j]*sint2[i];
870 y = sint1[j]*sint2[i];
873 (*vertices)[idx ] = x*radius;
874 (*vertices)[idx+1] = y*radius;
875 (*vertices)[idx+2] = z*radius;
876 (*normals )[idx ] = x;
877 (*normals )[idx+1] = y;
878 (*normals )[idx+2] = z;
883 (*vertices)[idx ] = 0.f;
884 (*vertices)[idx+1] = 0.f;
885 (*vertices)[idx+2] = -radius;
886 (*normals )[idx ] = 0.f;
887 (*normals )[idx+1] = 0.f;
888 (*normals )[idx+2] = -1.f;
890 /* Done creating vertices, release sin and cos tables */
898 /* -- INTERNAL DRAWING functions --------------------------------------- */
899 #define _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,vertIdxs)\
900 static void fgh##nameICaps( GLboolean useWireMode )\
904 fgh##nameICaps##Generate();\
905 name##Cached = GL_TRUE;\
910 fghDrawGeometryWire (name##_verts,name##_norms,\
911 nameCaps##_NUM_FACES,nameCaps##_NUM_EDGE_PER_FACE);\
915 fghDrawGeometrySolid(name##_verts,name##_norms,vertIdxs,\
916 nameCaps##_VERT_PER_OBJ, nameCaps##_VERT_PER_OBJ_TRI); \
919 #define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL)
920 #define DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,name##_vertIdxs)
922 static void fghCube( GLfloat dSize, GLboolean useWireMode )
929 cubeCached = GL_TRUE;
934 /* Need to build new vertex list containing vertices for cube of different size */
937 vertices = malloc(CUBE_VERT_ELEM_PER_OBJ * sizeof(GLfloat));
939 /* Bail out if memory allocation fails, fgError never returns */
943 fgError("Failed to allocate memory in fghCube");
946 for (i=0; i<CUBE_VERT_ELEM_PER_OBJ; i++)
947 vertices[i] = dSize*cube_verts[i];
950 vertices = cube_verts;
953 fghDrawGeometryWire (vertices, cube_norms,
954 CUBE_NUM_FACES, CUBE_NUM_EDGE_PER_FACE);
956 fghDrawGeometrySolid(vertices, cube_norms, cube_vertIdxs,
957 CUBE_VERT_PER_OBJ, CUBE_VERT_PER_OBJ_TRI);
960 /* cleanup allocated memory */
964 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
965 DECLARE_INTERNAL_DRAW(icosahedron,Icosahedron,ICOSAHEDRON);
966 DECLARE_INTERNAL_DRAW(octahedron,Octahedron,OCTAHEDRON);
967 DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(rhombicdodecahedron,RhombicDodecahedron,RHOMBICDODECAHEDRON);
968 DECLARE_INTERNAL_DRAW(tetrahedron,Tetrahedron,TETRAHEDRON);
970 static void fghSierpinskiSponge ( int numLevels, double offset[3], GLfloat scale, GLboolean useWireMode )
974 GLsizei numTetr = numLevels<0? 0 : ipow(4,numLevels); /* No sponge for numLevels below 0 */
975 GLsizei numVert = numTetr*TETRAHEDRON_VERT_PER_OBJ;
976 GLsizei numFace = numTetr*TETRAHEDRON_NUM_FACES;
980 /* Allocate memory */
981 vertices = malloc(numVert*3 * sizeof(GLfloat));
982 normals = malloc(numVert*3 * sizeof(GLfloat));
983 /* Bail out if memory allocation fails, fgError never returns */
984 if (!vertices || !normals)
988 fgError("Failed to allocate memory in fghSierpinskiSponge");
991 /* Generate elements */
992 fghSierpinskiSpongeGenerate ( numLevels, offset, scale, vertices, normals );
994 /* Draw and cleanup */
996 fghDrawGeometryWire (vertices,normals,numFace,TETRAHEDRON_NUM_EDGE_PER_FACE);
998 fghDrawGeometrySolid(vertices,normals,NULL,numVert,numVert);
1006 #ifndef GL_ES_VERSION_2_0
1007 static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useWireMode )
1010 GLfloat *vertices, *normals;
1012 if (slices * stacks > 65535)
1013 fgWarning("fghSphere: too many slices or stacks requested, indices will wrap");
1015 /* Generate vertices and normals */
1016 fghGenerateSphere((GLfloat)radius,slices,stacks,&vertices,&normals,&nVert);
1019 /* nothing to draw */
1024 GLushort *sliceIdx, *stackIdx;
1025 /* First, generate vertex index arrays for drawing with glDrawElements
1026 * We have a bunch of line_loops to draw for each stack, and a
1027 * bunch for each slice.
1030 sliceIdx = malloc(slices*(stacks+1)*sizeof(GLushort));
1031 stackIdx = malloc(slices*(stacks-1)*sizeof(GLushort));
1033 /* generate for each stack */
1034 for (i=0,idx=0; i<slices; i++)
1036 GLushort offset = 1+i; /* start at 1 (0 is top vertex), and we advance one slice as we go along */
1037 sliceIdx[idx++] = 0; /* vertex on top */
1038 for (j=0; j<stacks-1; j++, idx++)
1040 sliceIdx[idx] = offset+j*slices;
1042 sliceIdx[idx++] = nVert-1; /* zero based index, last element in array... */
1045 /* generate for each stack */
1046 for (i=0,idx=0; i<stacks-1; i++)
1048 GLushort offset = 1+i*slices; /* start at 1 (0 is top vertex), and we advance one stack down as we go along */
1049 for (j=0; j<slices; j++, idx++)
1051 stackIdx[idx] = offset+j;
1056 glEnableClientState(GL_VERTEX_ARRAY);
1057 glEnableClientState(GL_NORMAL_ARRAY);
1059 glVertexPointer(3, GL_FLOAT, 0, vertices);
1060 glNormalPointer(GL_FLOAT, 0, normals);
1062 for (i=0; i<slices; i++)
1063 glDrawElements(GL_LINE_STRIP,stacks+1,GL_UNSIGNED_SHORT,sliceIdx+i*(stacks+1));
1065 for (i=0; i<stacks-1; i++)
1066 glDrawElements(GL_LINE_LOOP, slices,GL_UNSIGNED_SHORT,stackIdx+i*slices);
1068 glDisableClientState(GL_VERTEX_ARRAY);
1069 glDisableClientState(GL_NORMAL_ARRAY);
1071 /* cleanup allocated memory */
1077 GLushort *topIdx, *bottomIdx, *stripIdx;
1078 /* First, generate vertex index arrays for drawing with glDrawElements
1079 * Top and bottom are covered with a triangle fan
1080 * Each other stack with triangle strip. Only need to generate on
1081 * of those as we'll have to draw each stack separately, and can
1082 * just use different offsets in glDrawElements.
1085 /* Allocate buffers for indices, bail out if memory allocation fails */
1086 topIdx = malloc((slices+2)*sizeof(GLushort));
1087 bottomIdx = malloc((slices+2)*sizeof(GLushort));
1088 stripIdx = malloc((slices+1)*2*(stacks-2)*sizeof(GLushort));
1089 if (!(topIdx) || !(bottomIdx) || !(stripIdx))
1094 fgError("Failed to allocate memory in fghGenerateSphere");
1097 /* TODO: Can do top and bottom as Triangle strip as well
1098 (just need to repeat top/btoom vertex a lot). Then we can draw
1099 the whole thing with just one index array and one for-looped call
1100 to glDrawElements.. That'll make it easier to reuse code with other
1101 Circular objects too
1104 topIdx[1] = 1; /* repeat first slice's idx for closing off shape */
1105 for (j=slices, idx=2; j>0; j--, idx++)
1108 bottomIdx[0]=nVert-1; /* zero based index, last element in array... */
1109 for (j=0, idx=1; j<slices; j++, idx++)
1110 bottomIdx[idx] = nVert-(slices+1)+j;
1111 bottomIdx[idx] = nVert-(slices+1); /* repeat first slice's idx for closing off shape */
1113 /* Strip indices are relative to first index belonging to strip, NOT relative to first vertex/normal pair in array */
1114 for (i=0,idx=0; i<stacks-2; i++, idx+=2)
1116 GLushort offset = 1+i*slices; /* triangle_strip indices start at 1 (0 is top vertex), and we advance one stack down as we go along */
1117 for (j=0; j<slices; j++, idx+=2)
1119 stripIdx[idx ] = offset+j+slices;
1120 stripIdx[idx+1] = offset+j;
1122 stripIdx[idx ] = offset+slices; /* repeat first slice's idx for closing off shape */
1123 stripIdx[idx+1] = offset+0;
1128 glEnableClientState(GL_VERTEX_ARRAY);
1129 glEnableClientState(GL_NORMAL_ARRAY);
1131 glVertexPointer(3, GL_FLOAT, 0, vertices);
1132 glNormalPointer(GL_FLOAT, 0, normals);
1134 glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_SHORT,topIdx);
1136 for (i=0; i<stacks-2; i++)
1137 glDrawElements(GL_TRIANGLE_STRIP,(slices+1)*2,GL_UNSIGNED_SHORT,stripIdx+i*(slices+1)*2);
1139 glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_SHORT,bottomIdx);
1141 glDisableClientState(GL_VERTEX_ARRAY);
1142 glDisableClientState(GL_NORMAL_ARRAY);
1144 /* cleanup allocated memory */
1150 /* cleanup allocated memory */
1157 /* -- INTERFACE FUNCTIONS ---------------------------------------------- */
1161 * Draws a solid sphere
1163 void FGAPIENTRY glutSolidSphere(double radius, GLint slices, GLint stacks)
1165 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
1167 fghSphere( radius, slices, stacks, FALSE );
1171 * Draws a wire sphere
1173 void FGAPIENTRY glutWireSphere(double radius, GLint slices, GLint stacks)
1175 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
1177 fghSphere( radius, slices, stacks, TRUE );
1180 #endif /* GL_ES_VERSION_2_0 */
1182 #ifndef EGL_VERSION_1_0
1184 * Draws a solid cone
1186 void FGAPIENTRY glutSolidCone( double base, double height, GLint slices, GLint stacks )
1190 /* Step in z and radius as stacks are drawn. */
1195 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1196 const GLfloat rStep = (GLfloat)base / ( ( stacks > 0 ) ? stacks : 1 );
1198 /* Scaling factors for vertex normals */
1201 const GLfloat cosn = ( (GLfloat)height / sqrtf( height * height + base * base ));
1202 const GLfloat sinn = ( (GLfloat)base / sqrtf( height * height + base * base ));
1204 const GLfloat cosn = ( (GLfloat)height / (GLfloat)sqrt( (double)(height * height + base * base) ));
1205 const GLfloat sinn = ( (GLfloat)base / (GLfloat)sqrt( (double)(height * height + base * base) ));
1206 #endif /* __cplusplus */
1208 /* Pre-computed circle */
1210 GLfloat *sint,*cost;
1212 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
1214 fghCircleTable(&sint,&cost,-slices,FALSE);
1216 /* Cover the circular base with a triangle fan... */
1224 glBegin(GL_TRIANGLE_FAN);
1227 glVertex3f(0,0, z0 );
1229 for (j=0; j<=slices; j++)
1230 glVertex3f(cost[j]*r0, sint[j]*r0, z0);
1234 /* Cover each stack with a triangle strip */
1235 for( i=0; i<stacks; i++ )
1237 glBegin(GL_TRIANGLE_STRIP);
1239 for(j=0; j<=slices; j++)
1241 glNormal3f(cost[j]*cosn, sint[j]*cosn, sinn);
1242 glVertex3f(cost[j]*r0, sint[j]*r0, z0 );
1243 glVertex3f(cost[j]*r1, sint[j]*r1, z1 );
1246 z0 = z1; z1 += zStep;
1247 r0 = r1; r1 -= rStep;
1252 /* Release sin and cos tables */
1261 void FGAPIENTRY glutWireCone( double base, double height, GLint slices, GLint stacks)
1265 /* Step in z and radius as stacks are drawn. */
1268 GLfloat r = (GLfloat)base;
1270 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1271 const GLfloat rStep = (GLfloat)base / ( ( stacks > 0 ) ? stacks : 1 );
1273 /* Scaling factors for vertex normals */
1276 const GLfloat cosn = ( (GLfloat)height / sqrtf( height * height + base * base ));
1277 const GLfloat sinn = ( (GLfloat)base / sqrtf( height * height + base * base ));
1279 const GLfloat cosn = ( (GLfloat)height / (GLfloat)sqrt( (double)(height * height + base * base) ));
1280 const GLfloat sinn = ( (GLfloat)base / (GLfloat)sqrt( (double)(height * height + base * base) ));
1281 #endif /* __cplusplus */
1283 /* Pre-computed circle */
1285 GLfloat *sint,*cost;
1287 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
1289 fghCircleTable(&sint,&cost,-slices,FALSE);
1291 /* Draw the stacks... */
1293 for (i=0; i<stacks; i++)
1295 glBegin(GL_LINE_LOOP);
1297 for( j=0; j<slices; j++ )
1299 glNormal3f(cost[j]*sinn, sint[j]*sinn, cosn);
1300 glVertex3f(cost[j]*r, sint[j]*r, z );
1309 /* Draw the slices */
1315 for (j=0; j<slices; j++)
1317 glNormal3f(cost[j]*sinn, sint[j]*sinn, cosn );
1318 glVertex3f(cost[j]*r, sint[j]*r, 0 );
1319 glVertex3f(0, 0, (GLfloat)height);
1324 /* Release sin and cos tables */
1332 * Draws a solid cylinder
1334 void FGAPIENTRY glutSolidCylinder(double radius, double height, GLint slices, GLint stacks)
1338 /* Step in z and radius as stacks are drawn. */
1339 GLfloat radf = (GLfloat)radius;
1341 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1343 /* Pre-computed circle */
1345 GLfloat *sint,*cost;
1347 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
1349 fghCircleTable(&sint,&cost,-slices,FALSE);
1351 /* Cover the base and top */
1353 glBegin(GL_TRIANGLE_FAN);
1354 glNormal3f(0, 0, -1 );
1355 glVertex3f(0, 0, 0 );
1356 for (j=0; j<=slices; j++)
1357 glVertex3f(cost[j]*radf, sint[j]*radf, 0);
1360 glBegin(GL_TRIANGLE_FAN);
1361 glNormal3f(0, 0, 1 );
1362 glVertex3f(0, 0, (GLfloat)height);
1363 for (j=slices; j>=0; j--)
1364 glVertex3f(cost[j]*radf, sint[j]*radf, (GLfloat)height);
1372 for (i=1; i<=stacks; i++)
1375 z1 = (GLfloat)height;
1377 glBegin(GL_TRIANGLE_STRIP);
1378 for (j=0; j<=slices; j++ )
1380 glNormal3f(cost[j], sint[j], 0 );
1381 glVertex3f(cost[j]*radf, sint[j]*radf, z0 );
1382 glVertex3f(cost[j]*radf, sint[j]*radf, z1 );
1386 z0 = z1; z1 += zStep;
1389 /* Release sin and cos tables */
1396 * Draws a wire cylinder
1398 void FGAPIENTRY glutWireCylinder(double radius, double height, GLint slices, GLint stacks)
1402 /* Step in z and radius as stacks are drawn. */
1403 GLfloat radf = (GLfloat)radius;
1405 const GLfloat zStep = (GLfloat)height / ( ( stacks > 0 ) ? stacks : 1 );
1407 /* Pre-computed circle */
1409 GLfloat *sint,*cost;
1411 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
1413 fghCircleTable(&sint,&cost,-slices,FALSE);
1415 /* Draw the stacks... */
1417 for (i=0; i<=stacks; i++)
1420 z = (GLfloat)height;
1422 glBegin(GL_LINE_LOOP);
1424 for( j=0; j<slices; j++ )
1426 glNormal3f(cost[j], sint[j], 0);
1427 glVertex3f(cost[j]*radf, sint[j]*radf, z);
1435 /* Draw the slices */
1439 for (j=0; j<slices; j++)
1441 glNormal3f(cost[j], sint[j], 0 );
1442 glVertex3f(cost[j]*radf, sint[j]*radf, 0 );
1443 glVertex3f(cost[j]*radf, sint[j]*radf, (GLfloat)height);
1448 /* Release sin and cos tables */
1455 * Draws a wire torus
1457 void FGAPIENTRY glutWireTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
1459 GLfloat iradius = (float)dInnerRadius, oradius = (float)dOuterRadius;
1460 GLfloat phi, psi, dpsi, dphi;
1461 GLfloat *vertex, *normal;
1463 GLfloat spsi, cpsi, sphi, cphi ;
1465 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
1467 if ( nSides < 1 ) nSides = 1;
1468 if ( nRings < 1 ) nRings = 1;
1470 /* Allocate the vertices array */
1471 vertex = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1472 normal = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1476 dpsi = 2.0f * (GLfloat)M_PI / (GLfloat)(nRings) ;
1477 dphi = -2.0f * (GLfloat)M_PI / (GLfloat)(nSides) ;
1480 for( j=0; j<nRings; j++ )
1483 cpsi = cosf( psi ) ;
1484 spsi = sinf( psi ) ;
1486 cpsi = (float)cos( (double)psi ) ;
1487 spsi = (float)sin( (double)psi ) ;
1488 #endif /* __cplusplus */
1491 for( i=0; i<nSides; i++ )
1493 int offset = 3 * ( j * nSides + i ) ;
1495 cphi = cosf( phi ) ;
1496 sphi = sinf( phi ) ;
1498 cphi = (float)cos( (double)phi ) ;
1499 sphi = (float)sin( (double)phi ) ;
1500 #endif /* __cplusplus */
1501 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1502 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1503 *(vertex + offset + 2) = sphi * iradius ;
1504 *(normal + offset + 0) = cpsi * cphi ;
1505 *(normal + offset + 1) = spsi * cphi ;
1506 *(normal + offset + 2) = sphi ;
1513 for( i=0; i<nSides; i++ )
1515 glBegin( GL_LINE_LOOP );
1517 for( j=0; j<nRings; j++ )
1519 int offset = 3 * ( j * nSides + i ) ;
1520 glNormal3fv( normal + offset );
1521 glVertex3fv( vertex + offset );
1527 for( j=0; j<nRings; j++ )
1529 glBegin(GL_LINE_LOOP);
1531 for( i=0; i<nSides; i++ )
1533 int offset = 3 * ( j * nSides + i ) ;
1534 glNormal3fv( normal + offset );
1535 glVertex3fv( vertex + offset );
1547 * Draws a solid torus
1549 void FGAPIENTRY glutSolidTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
1551 GLfloat iradius = (float)dInnerRadius, oradius = (float)dOuterRadius;
1552 GLfloat phi, psi, dpsi, dphi;
1553 GLfloat *vertex, *normal;
1555 GLfloat spsi, cpsi, sphi, cphi ;
1557 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
1559 if ( nSides < 1 ) nSides = 1;
1560 if ( nRings < 1 ) nRings = 1;
1562 /* Increment the number of sides and rings to allow for one more point than surface */
1566 /* Allocate the vertices array */
1567 vertex = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1568 normal = (GLfloat *)calloc( sizeof(GLfloat), 3 * nSides * nRings );
1572 dpsi = 2.0f * (GLfloat)M_PI / (GLfloat)(nRings - 1) ;
1573 dphi = -2.0f * (GLfloat)M_PI / (GLfloat)(nSides - 1) ;
1576 for( j=0; j<nRings; j++ )
1579 cpsi = cosf( psi ) ;
1580 spsi = sinf( psi ) ;
1582 cpsi = (float)cos( (double)psi ) ;
1583 spsi = (float)sin( (double)psi ) ;
1584 #endif /* __cplusplus */
1587 for( i=0; i<nSides; i++ )
1589 int offset = 3 * ( j * nSides + i ) ;
1591 cphi = cosf( phi ) ;
1592 sphi = sinf( phi ) ;
1594 cphi = (float)cos( (double)phi ) ;
1595 sphi = (float)sin( (double)phi ) ;
1596 #endif /* __cplusplus */
1597 *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
1598 *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
1599 *(vertex + offset + 2) = sphi * iradius ;
1600 *(normal + offset + 0) = cpsi * cphi ;
1601 *(normal + offset + 1) = spsi * cphi ;
1602 *(normal + offset + 2) = sphi ;
1609 glBegin( GL_QUADS );
1610 for( i=0; i<nSides-1; i++ )
1612 for( j=0; j<nRings-1; j++ )
1614 int offset = 3 * ( j * nSides + i ) ;
1615 glNormal3fv( normal + offset );
1616 glVertex3fv( vertex + offset );
1617 glNormal3fv( normal + offset + 3 );
1618 glVertex3fv( vertex + offset + 3 );
1619 glNormal3fv( normal + offset + 3 * nSides + 3 );
1620 glVertex3fv( vertex + offset + 3 * nSides + 3 );
1621 glNormal3fv( normal + offset + 3 * nSides );
1622 glVertex3fv( vertex + offset + 3 * nSides );
1632 #endif /* EGL_VERSION_1_0 */
1636 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
1637 /* Macro to generate interface functions */
1638 #define DECLARE_SHAPE_INTERFACE(nameICaps)\
1639 void FGAPIENTRY glutWire##nameICaps( void )\
1641 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWire"#nameICaps );\
1642 fgh##nameICaps( TRUE );\
1644 void FGAPIENTRY glutSolid##nameICaps( void )\
1646 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolid"#nameICaps );\
1647 fgh##nameICaps( FALSE );\
1650 void FGAPIENTRY glutWireCube( double dSize )
1652 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
1653 fghCube( (GLfloat)dSize, TRUE );
1655 void FGAPIENTRY glutSolidCube( double dSize )
1657 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
1658 fghCube( (GLfloat)dSize, FALSE );
1661 DECLARE_SHAPE_INTERFACE(Dodecahedron);
1662 DECLARE_SHAPE_INTERFACE(Icosahedron);
1663 DECLARE_SHAPE_INTERFACE(Octahedron);
1664 DECLARE_SHAPE_INTERFACE(RhombicDodecahedron);
1666 void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, double offset[3], double scale )
1668 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
1669 fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, TRUE );
1671 void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, double offset[3], double scale )
1673 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
1674 fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, FALSE );
1677 DECLARE_SHAPE_INTERFACE(Tetrahedron);
1680 /*** END OF FILE ***/