ld33_umonster

annotate src/meshgen.cc @ 0:4a6683050e29

find changesets by author, revision, files, or words in the commit message
initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 22 Aug 2015 07:15:00 +0300
parents
children bed0e207acb6
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include "meshgen.h"
nuclear@0 3 #include "mesh.h"
nuclear@0 4
nuclear@0 5 // -------- sphere --------
nuclear@0 6
nuclear@0 7 #define SURAD(u) ((u) * 2.0 * M_PI)
nuclear@0 8 #define SVRAD(v) ((v) * M_PI)
nuclear@0 9
nuclear@0 10 static Vector3 sphvec(float theta, float phi)
nuclear@0 11 {
nuclear@0 12 return Vector3(sin(theta) * sin(phi),
nuclear@0 13 cos(phi),
nuclear@0 14 cos(theta) * sin(phi));
nuclear@0 15 }
nuclear@0 16
nuclear@0 17 void gen_sphere(Mesh *mesh, float rad, int usub, int vsub, float urange, float vrange)
nuclear@0 18 {
nuclear@0 19 if(usub < 4) usub = 4;
nuclear@0 20 if(vsub < 2) vsub = 2;
nuclear@0 21
nuclear@0 22 int uverts = usub + 1;
nuclear@0 23 int vverts = vsub + 1;
nuclear@0 24
nuclear@0 25 int num_verts = uverts * vverts;
nuclear@0 26 int num_quads = usub * vsub;
nuclear@0 27 int num_tri = num_quads * 2;
nuclear@0 28
nuclear@0 29 mesh->clear();
nuclear@0 30 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 31 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 32 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 33 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 34 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 35
nuclear@0 36 float du = urange / (float)(uverts - 1);
nuclear@0 37 float dv = vrange / (float)(vverts - 1);
nuclear@0 38
nuclear@0 39 float u = 0.0;
nuclear@0 40 for(int i=0; i<uverts; i++) {
nuclear@0 41 float theta = SURAD(u * urange);
nuclear@0 42
nuclear@0 43 float v = 0.0;
nuclear@0 44 for(int j=0; j<vverts; j++) {
nuclear@0 45 float phi = SVRAD(v * vrange);
nuclear@0 46
nuclear@0 47 Vector3 pos = sphvec(theta, phi);
nuclear@0 48
nuclear@0 49 *varr++ = pos * rad;
nuclear@0 50 *narr++ = pos;
nuclear@0 51 *tarr++ = (sphvec(theta + 0.1f, (float)M_PI / 2.0f) - sphvec(theta - 0.1f, (float)M_PI / 2.0f)).normalized();
nuclear@0 52 *uvarr++ = Vector2(u * urange, v * vrange);
nuclear@0 53
nuclear@0 54 if(i < usub && j < vsub) {
nuclear@0 55 int idx = i * vverts + j;
nuclear@0 56 *idxarr++ = idx;
nuclear@0 57 *idxarr++ = idx + 1;
nuclear@0 58 *idxarr++ = idx + vverts + 1;
nuclear@0 59
nuclear@0 60 *idxarr++ = idx;
nuclear@0 61 *idxarr++ = idx + vverts + 1;
nuclear@0 62 *idxarr++ = idx + vverts;
nuclear@0 63 }
nuclear@0 64
nuclear@0 65 v += dv;
nuclear@0 66 }
nuclear@0 67 u += du;
nuclear@0 68 }
nuclear@0 69 }
nuclear@0 70
nuclear@0 71
nuclear@0 72 // -------- cylinder --------
nuclear@0 73
nuclear@0 74 static Vector3 cylvec(float theta, float height)
nuclear@0 75 {
nuclear@0 76 return Vector3(sin(theta), height, cos(theta));
nuclear@0 77 }
nuclear@0 78
nuclear@0 79 void gen_cylinder(Mesh *mesh, float rad, float height, int usub, int vsub, int capsub, float urange, float vrange)
nuclear@0 80 {
nuclear@0 81 if(usub < 4) usub = 4;
nuclear@0 82 if(vsub < 1) vsub = 1;
nuclear@0 83
nuclear@0 84 int uverts = usub + 1;
nuclear@0 85 int vverts = vsub + 1;
nuclear@0 86
nuclear@0 87 int num_body_verts = uverts * vverts;
nuclear@0 88 int num_body_quads = usub * vsub;
nuclear@0 89 int num_body_tri = num_body_quads * 2;
nuclear@0 90
nuclear@0 91 int capvverts = capsub ? capsub + 1 : 0;
nuclear@0 92 int num_cap_verts = uverts * capvverts;
nuclear@0 93 int num_cap_quads = usub * capsub;
nuclear@0 94 int num_cap_tri = num_cap_quads * 2;
nuclear@0 95
nuclear@0 96 int num_verts = num_body_verts + num_cap_verts * 2;
nuclear@0 97 int num_tri = num_body_tri + num_cap_tri * 2;
nuclear@0 98
nuclear@0 99 mesh->clear();
nuclear@0 100 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 101 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 102 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 103 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 104 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 105
nuclear@0 106 float du = urange / (float)(uverts - 1);
nuclear@0 107 float dv = vrange / (float)(vverts - 1);
nuclear@0 108
nuclear@0 109 float u = 0.0;
nuclear@0 110 for(int i=0; i<uverts; i++) {
nuclear@0 111 float theta = SURAD(u);
nuclear@0 112
nuclear@0 113 float v = 0.0;
nuclear@0 114 for(int j=0; j<vverts; j++) {
nuclear@0 115 float y = (v - 0.5) * height;
nuclear@0 116 Vector3 pos = cylvec(theta, y);
nuclear@0 117
nuclear@0 118 *varr++ = Vector3(pos.x * rad, pos.y, pos.z * rad);
nuclear@0 119 *narr++ = Vector3(pos.x, 0.0, pos.z);
nuclear@0 120 *tarr++ = (cylvec(theta + 0.1, 0.0) - cylvec(theta - 0.1, 0.0)).normalized();
nuclear@0 121 *uvarr++ = Vector2(u * urange, v * vrange);
nuclear@0 122
nuclear@0 123 if(i < usub && j < vsub) {
nuclear@0 124 int idx = i * vverts + j;
nuclear@0 125
nuclear@0 126 *idxarr++ = idx;
nuclear@0 127 *idxarr++ = idx + vverts + 1;
nuclear@0 128 *idxarr++ = idx + 1;
nuclear@0 129
nuclear@0 130 *idxarr++ = idx;
nuclear@0 131 *idxarr++ = idx + vverts;
nuclear@0 132 *idxarr++ = idx + vverts + 1;
nuclear@0 133 }
nuclear@0 134
nuclear@0 135 v += dv;
nuclear@0 136 }
nuclear@0 137 u += du;
nuclear@0 138 }
nuclear@0 139
nuclear@0 140
nuclear@0 141 // now the cap!
nuclear@0 142 if(!capsub) {
nuclear@0 143 return;
nuclear@0 144 }
nuclear@0 145
nuclear@0 146 dv = 1.0 / (float)(capvverts - 1);
nuclear@0 147
nuclear@0 148 u = 0.0;
nuclear@0 149 for(int i=0; i<uverts; i++) {
nuclear@0 150 float theta = SURAD(u);
nuclear@0 151
nuclear@0 152 float v = 0.0;
nuclear@0 153 for(int j=0; j<capvverts; j++) {
nuclear@0 154 float r = v * rad;
nuclear@0 155
nuclear@0 156 Vector3 pos = cylvec(theta, height / 2.0) * r;
nuclear@0 157 pos.y = height / 2.0;
nuclear@0 158 Vector3 tang = (cylvec(theta + 0.1, 0.0) - cylvec(theta - 0.1, 0.0)).normalized();
nuclear@0 159
nuclear@0 160 *varr++ = pos;
nuclear@0 161 *narr++ = Vector3(0, 1, 0);
nuclear@0 162 *tarr++ = tang;
nuclear@0 163 *uvarr++ = Vector2(u * urange, v);
nuclear@0 164
nuclear@0 165 pos.y = -height / 2.0;
nuclear@0 166 *varr++ = pos;
nuclear@0 167 *narr++ = Vector3(0, -1, 0);
nuclear@0 168 *tarr++ = -tang;
nuclear@0 169 *uvarr++ = Vector2(u * urange, v);
nuclear@0 170
nuclear@0 171 if(i < usub && j < capsub) {
nuclear@0 172 unsigned int idx = num_body_verts + (i * capvverts + j) * 2;
nuclear@0 173
nuclear@0 174 unsigned int vidx[4] = {
nuclear@0 175 idx,
nuclear@0 176 idx + capvverts * 2,
nuclear@0 177 idx + (capvverts + 1) * 2,
nuclear@0 178 idx + 2
nuclear@0 179 };
nuclear@0 180
nuclear@0 181 *idxarr++ = vidx[0];
nuclear@0 182 *idxarr++ = vidx[2];
nuclear@0 183 *idxarr++ = vidx[1];
nuclear@0 184 *idxarr++ = vidx[0];
nuclear@0 185 *idxarr++ = vidx[3];
nuclear@0 186 *idxarr++ = vidx[2];
nuclear@0 187
nuclear@0 188 *idxarr++ = vidx[0] + 1;
nuclear@0 189 *idxarr++ = vidx[1] + 1;
nuclear@0 190 *idxarr++ = vidx[2] + 1;
nuclear@0 191 *idxarr++ = vidx[0] + 1;
nuclear@0 192 *idxarr++ = vidx[2] + 1;
nuclear@0 193 *idxarr++ = vidx[3] + 1;
nuclear@0 194 }
nuclear@0 195
nuclear@0 196 v += dv;
nuclear@0 197 }
nuclear@0 198 u += du;
nuclear@0 199 }
nuclear@0 200 }
nuclear@0 201
nuclear@0 202 // -------- cone --------
nuclear@0 203
nuclear@0 204 static Vector3 conevec(float theta, float y, float height)
nuclear@0 205 {
nuclear@0 206 float scale = 1.0 - y / height;
nuclear@0 207 return Vector3(sin(theta) * scale, y, cos(theta) * scale);
nuclear@0 208 }
nuclear@0 209
nuclear@0 210 void gen_cone(Mesh *mesh, float rad, float height, int usub, int vsub, int capsub, float urange, float vrange)
nuclear@0 211 {
nuclear@0 212 if(usub < 4) usub = 4;
nuclear@0 213 if(vsub < 1) vsub = 1;
nuclear@0 214
nuclear@0 215 int uverts = usub + 1;
nuclear@0 216 int vverts = vsub + 1;
nuclear@0 217
nuclear@0 218 int num_body_verts = uverts * vverts;
nuclear@0 219 int num_body_quads = usub * vsub;
nuclear@0 220 int num_body_tri = num_body_quads * 2;
nuclear@0 221
nuclear@0 222 int capvverts = capsub ? capsub + 1 : 0;
nuclear@0 223 int num_cap_verts = uverts * capvverts;
nuclear@0 224 int num_cap_quads = usub * capsub;
nuclear@0 225 int num_cap_tri = num_cap_quads * 2;
nuclear@0 226
nuclear@0 227 int num_verts = num_body_verts + num_cap_verts;
nuclear@0 228 int num_tri = num_body_tri + num_cap_tri;
nuclear@0 229
nuclear@0 230 mesh->clear();
nuclear@0 231 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 232 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 233 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 234 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 235 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 236
nuclear@0 237 float du = urange / (float)(uverts - 1);
nuclear@0 238 float dv = vrange / (float)(vverts - 1);
nuclear@0 239
nuclear@0 240 float u = 0.0;
nuclear@0 241 for(int i=0; i<uverts; i++) {
nuclear@0 242 float theta = SURAD(u);
nuclear@0 243
nuclear@0 244 float v = 0.0;
nuclear@0 245 for(int j=0; j<vverts; j++) {
nuclear@0 246 float y = v * height;
nuclear@0 247 Vector3 pos = conevec(theta, y, height);
nuclear@0 248
nuclear@0 249 Vector3 tang = (conevec(theta + 0.1, 0.0, height) - conevec(theta - 0.1, 0.0, height)).normalized();
nuclear@0 250 Vector3 bitang = (conevec(theta, y + 0.1, height) - pos).normalized();
nuclear@0 251
nuclear@0 252 *varr++ = Vector3(pos.x * rad, pos.y, pos.z * rad);
nuclear@0 253 *narr++ = cross_product(tang, bitang);
nuclear@0 254 *tarr++ = tang;
nuclear@0 255 *uvarr++ = Vector2(u * urange, v * vrange);
nuclear@0 256
nuclear@0 257 if(i < usub && j < vsub) {
nuclear@0 258 int idx = i * vverts + j;
nuclear@0 259
nuclear@0 260 *idxarr++ = idx;
nuclear@0 261 *idxarr++ = idx + vverts + 1;
nuclear@0 262 *idxarr++ = idx + 1;
nuclear@0 263
nuclear@0 264 *idxarr++ = idx;
nuclear@0 265 *idxarr++ = idx + vverts;
nuclear@0 266 *idxarr++ = idx + vverts + 1;
nuclear@0 267 }
nuclear@0 268
nuclear@0 269 v += dv;
nuclear@0 270 }
nuclear@0 271 u += du;
nuclear@0 272 }
nuclear@0 273
nuclear@0 274
nuclear@0 275 // now the bottom cap!
nuclear@0 276 if(!capsub) {
nuclear@0 277 return;
nuclear@0 278 }
nuclear@0 279
nuclear@0 280 dv = 1.0 / (float)(capvverts - 1);
nuclear@0 281
nuclear@0 282 u = 0.0;
nuclear@0 283 for(int i=0; i<uverts; i++) {
nuclear@0 284 float theta = SURAD(u);
nuclear@0 285
nuclear@0 286 float v = 0.0;
nuclear@0 287 for(int j=0; j<capvverts; j++) {
nuclear@0 288 float r = v * rad;
nuclear@0 289
nuclear@0 290 Vector3 pos = conevec(theta, 0.0, height) * r;
nuclear@0 291 Vector3 tang = (cylvec(theta + 0.1, 0.0) - cylvec(theta - 0.1, 0.0)).normalized();
nuclear@0 292
nuclear@0 293 *varr++ = pos;
nuclear@0 294 *narr++ = Vector3(0, -1, 0);
nuclear@0 295 *tarr++ = tang;
nuclear@0 296 *uvarr++ = Vector2(u * urange, v);
nuclear@0 297
nuclear@0 298 if(i < usub && j < capsub) {
nuclear@0 299 unsigned int idx = num_body_verts + i * capvverts + j;
nuclear@0 300
nuclear@0 301 unsigned int vidx[4] = {
nuclear@0 302 idx,
nuclear@0 303 idx + capvverts,
nuclear@0 304 idx + (capvverts + 1),
nuclear@0 305 idx + 1
nuclear@0 306 };
nuclear@0 307
nuclear@0 308 *idxarr++ = vidx[0];
nuclear@0 309 *idxarr++ = vidx[1];
nuclear@0 310 *idxarr++ = vidx[2];
nuclear@0 311 *idxarr++ = vidx[0];
nuclear@0 312 *idxarr++ = vidx[2];
nuclear@0 313 *idxarr++ = vidx[3];
nuclear@0 314 }
nuclear@0 315
nuclear@0 316 v += dv;
nuclear@0 317 }
nuclear@0 318 u += du;
nuclear@0 319 }
nuclear@0 320 }
nuclear@0 321
nuclear@0 322
nuclear@0 323 // -------- plane --------
nuclear@0 324
nuclear@0 325 void gen_plane(Mesh *mesh, float width, float height, int usub, int vsub)
nuclear@0 326 {
nuclear@0 327 gen_heightmap(mesh, width, height, usub, vsub, 0);
nuclear@0 328 }
nuclear@0 329
nuclear@0 330
nuclear@0 331 // ----- heightmap ------
nuclear@0 332
nuclear@0 333 void gen_heightmap(Mesh *mesh, float width, float height, int usub, int vsub, float (*hf)(float, float, void*), void *hfdata)
nuclear@0 334 {
nuclear@0 335 if(usub < 1) usub = 1;
nuclear@0 336 if(vsub < 1) vsub = 1;
nuclear@0 337
nuclear@0 338 mesh->clear();
nuclear@0 339
nuclear@0 340 int uverts = usub + 1;
nuclear@0 341 int vverts = vsub + 1;
nuclear@0 342 int num_verts = uverts * vverts;
nuclear@0 343
nuclear@0 344 int num_quads = usub * vsub;
nuclear@0 345 int num_tri = num_quads * 2;
nuclear@0 346
nuclear@0 347 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 348 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 349 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 350 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 351 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 352
nuclear@0 353 float du = 1.0 / (float)usub;
nuclear@0 354 float dv = 1.0 / (float)vsub;
nuclear@0 355
nuclear@0 356 float u = 0.0;
nuclear@0 357 for(int i=0; i<uverts; i++) {
nuclear@0 358 float v = 0.0;
nuclear@0 359 for(int j=0; j<vverts; j++) {
nuclear@0 360 float x = (u - 0.5) * width;
nuclear@0 361 float y = (v - 0.5) * height;
nuclear@0 362 float z = hf ? hf(u, v, hfdata) : 0.0;
nuclear@0 363
nuclear@0 364 Vector3 normal = Vector3(0, 0, 1);
nuclear@0 365 if(hf) {
nuclear@0 366 float u1z = hf(u + du, v, hfdata);
nuclear@0 367 float v1z = hf(u, v + dv, hfdata);
nuclear@0 368
nuclear@0 369 Vector3 tang = Vector3(du * width, 0, u1z - z);
nuclear@0 370 Vector3 bitan = Vector3(0, dv * height, v1z - z);
nuclear@0 371 normal = cross_product(tang, bitan).normalized();
nuclear@0 372 }
nuclear@0 373
nuclear@0 374 *varr++ = Vector3(x, y, z);
nuclear@0 375 *narr++ = normal;
nuclear@0 376 *tarr++ = Vector3(1, 0, 0);
nuclear@0 377 *uvarr++ = Vector2(u, v);
nuclear@0 378
nuclear@0 379 if(i < usub && j < vsub) {
nuclear@0 380 int idx = i * vverts + j;
nuclear@0 381
nuclear@0 382 *idxarr++ = idx;
nuclear@0 383 *idxarr++ = idx + vverts + 1;
nuclear@0 384 *idxarr++ = idx + 1;
nuclear@0 385
nuclear@0 386 *idxarr++ = idx;
nuclear@0 387 *idxarr++ = idx + vverts;
nuclear@0 388 *idxarr++ = idx + vverts + 1;
nuclear@0 389 }
nuclear@0 390
nuclear@0 391 v += dv;
nuclear@0 392 }
nuclear@0 393 u += du;
nuclear@0 394 }
nuclear@0 395 }
nuclear@0 396
nuclear@0 397 // ----- heightmap ------
nuclear@0 398
nuclear@0 399 void gen_box(Mesh *mesh, float xsz, float ysz, float zsz)
nuclear@0 400 {
nuclear@0 401 mesh->clear();
nuclear@0 402
nuclear@0 403 const int num_faces = 6;
nuclear@0 404 int num_verts = num_faces * 4;
nuclear@0 405 int num_tri = num_faces * 2;
nuclear@0 406
nuclear@0 407 float x = xsz / 2.0;
nuclear@0 408 float y = ysz / 2.0;
nuclear@0 409 float z = zsz / 2.0;
nuclear@0 410
nuclear@0 411 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 412 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 413 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 414 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 415 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 416
nuclear@0 417 static const Vector2 uv[] = { Vector2(0, 0), Vector2(1, 0), Vector2(1, 1), Vector2(0, 1) };
nuclear@0 418
nuclear@0 419 // front
nuclear@0 420 for(int i=0; i<4; i++) {
nuclear@0 421 *narr++ = Vector3(0, 0, 1);
nuclear@0 422 *tarr++ = Vector3(1, 0, 0);
nuclear@0 423 *uvarr++ = uv[i];
nuclear@0 424 }
nuclear@0 425 *varr++ = Vector3(-x, -y, z);
nuclear@0 426 *varr++ = Vector3(x, -y, z);
nuclear@0 427 *varr++ = Vector3(x, y, z);
nuclear@0 428 *varr++ = Vector3(-x, y, z);
nuclear@0 429 // right
nuclear@0 430 for(int i=0; i<4; i++) {
nuclear@0 431 *narr++ = Vector3(1, 0, 0);
nuclear@0 432 *tarr++ = Vector3(0, 0, -1);
nuclear@0 433 *uvarr++ = uv[i];
nuclear@0 434 }
nuclear@0 435 *varr++ = Vector3(x, -y, z);
nuclear@0 436 *varr++ = Vector3(x, -y, -z);
nuclear@0 437 *varr++ = Vector3(x, y, -z);
nuclear@0 438 *varr++ = Vector3(x, y, z);
nuclear@0 439 // back
nuclear@0 440 for(int i=0; i<4; i++) {
nuclear@0 441 *narr++ = Vector3(0, 0, -1);
nuclear@0 442 *tarr++ = Vector3(-1, 0, 0);
nuclear@0 443 *uvarr++ = uv[i];
nuclear@0 444 }
nuclear@0 445 *varr++ = Vector3(x, -y, -z);
nuclear@0 446 *varr++ = Vector3(-x, -y, -z);
nuclear@0 447 *varr++ = Vector3(-x, y, -z);
nuclear@0 448 *varr++ = Vector3(x, y, -z);
nuclear@0 449 // left
nuclear@0 450 for(int i=0; i<4; i++) {
nuclear@0 451 *narr++ = Vector3(-1, 0, 0);
nuclear@0 452 *tarr++ = Vector3(0, 0, 1);
nuclear@0 453 *uvarr++ = uv[i];
nuclear@0 454 }
nuclear@0 455 *varr++ = Vector3(-x, -y, -z);
nuclear@0 456 *varr++ = Vector3(-x, -y, z);
nuclear@0 457 *varr++ = Vector3(-x, y, z);
nuclear@0 458 *varr++ = Vector3(-x, y, -z);
nuclear@0 459 // top
nuclear@0 460 for(int i=0; i<4; i++) {
nuclear@0 461 *narr++ = Vector3(0, 1, 0);
nuclear@0 462 *tarr++ = Vector3(1, 0, 0);
nuclear@0 463 *uvarr++ = uv[i];
nuclear@0 464 }
nuclear@0 465 *varr++ = Vector3(-x, y, z);
nuclear@0 466 *varr++ = Vector3(x, y, z);
nuclear@0 467 *varr++ = Vector3(x, y, -z);
nuclear@0 468 *varr++ = Vector3(-x, y, -z);
nuclear@0 469 // bottom
nuclear@0 470 for(int i=0; i<4; i++) {
nuclear@0 471 *narr++ = Vector3(0, -1, 0);
nuclear@0 472 *tarr++ = Vector3(1, 0, 0);
nuclear@0 473 *uvarr++ = uv[i];
nuclear@0 474 }
nuclear@0 475 *varr++ = Vector3(-x, -y, -z);
nuclear@0 476 *varr++ = Vector3(x, -y, -z);
nuclear@0 477 *varr++ = Vector3(x, -y, z);
nuclear@0 478 *varr++ = Vector3(-x, -y, z);
nuclear@0 479
nuclear@0 480 // index array
nuclear@0 481 static const int faceidx[] = {0, 1, 2, 0, 2, 3};
nuclear@0 482 for(int i=0; i<num_faces; i++) {
nuclear@0 483 for(int j=0; j<6; j++) {
nuclear@0 484 *idxarr++ = faceidx[j] + i * 4;
nuclear@0 485 }
nuclear@0 486 }
nuclear@0 487 }
nuclear@0 488
nuclear@0 489 static inline Vector3 rev_vert(float u, float v, Vector2 (*rf)(float, float, void*), void *cls)
nuclear@0 490 {
nuclear@0 491 Vector2 pos = rf(u, v, cls);
nuclear@0 492
nuclear@0 493 float angle = u * 2.0 * M_PI;
nuclear@0 494 float x = pos.x * cos(angle);
nuclear@0 495 float y = pos.y;
nuclear@0 496 float z = pos.x * sin(angle);
nuclear@0 497
nuclear@0 498 return Vector3(x, y, z);
nuclear@0 499 }
nuclear@0 500
nuclear@0 501 // ------ surface of revolution -------
nuclear@0 502 void gen_revol(Mesh *mesh, int usub, int vsub, Vector2 (*rfunc)(float, float, void*), void *cls)
nuclear@0 503 {
nuclear@0 504 gen_revol(mesh, usub, vsub, rfunc, 0, cls);
nuclear@0 505 }
nuclear@0 506
nuclear@0 507 void gen_revol(Mesh *mesh, int usub, int vsub, Vector2 (*rfunc)(float, float, void*),
nuclear@0 508 Vector2 (*nfunc)(float, float, void*), void *cls)
nuclear@0 509 {
nuclear@0 510 if(!rfunc) return;
nuclear@0 511 if(usub < 3) usub = 3;
nuclear@0 512 if(vsub < 1) vsub = 1;
nuclear@0 513
nuclear@0 514 mesh->clear();
nuclear@0 515
nuclear@0 516 int uverts = usub + 1;
nuclear@0 517 int vverts = vsub + 1;
nuclear@0 518 int num_verts = uverts * vverts;
nuclear@0 519
nuclear@0 520 int num_quads = usub * vsub;
nuclear@0 521 int num_tri = num_quads * 2;
nuclear@0 522
nuclear@0 523 Vector3 *varr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, 0);
nuclear@0 524 Vector3 *narr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, 0);
nuclear@0 525 Vector3 *tarr = (Vector3*)mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, 0);
nuclear@0 526 Vector2 *uvarr = (Vector2*)mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 2, num_verts, 0);
nuclear@0 527 unsigned int *idxarr = mesh->set_index_data(num_tri * 3, 0);
nuclear@0 528
nuclear@0 529 float du = 1.0 / (float)(uverts - 1);
nuclear@0 530 float dv = 1.0 / (float)(vverts - 1);
nuclear@0 531
nuclear@0 532 float u = 0.0;
nuclear@0 533 for(int i=0; i<uverts; i++) {
nuclear@0 534 float v = 0.0;
nuclear@0 535 for(int j=0; j<vverts; j++) {
nuclear@0 536 Vector3 pos = rev_vert(u, v, rfunc, cls);
nuclear@0 537
nuclear@0 538 Vector3 nextu = rev_vert(fmod(u + du, 1.0), v, rfunc, cls);
nuclear@0 539 Vector3 tang = nextu - pos;
nuclear@0 540 if(tang.length_sq() < 1e-6) {
nuclear@0 541 float new_v = v > 0.5 ? v - dv * 0.25 : v + dv * 0.25;
nuclear@0 542 nextu = rev_vert(fmod(u + du, 1.0), new_v, rfunc, cls);
nuclear@0 543 tang = nextu - pos;
nuclear@0 544 }
nuclear@0 545
nuclear@0 546 Vector3 normal;
nuclear@0 547 if(nfunc) {
nuclear@0 548 normal = rev_vert(u, v, nfunc, cls);
nuclear@0 549 } else {
nuclear@0 550 Vector3 nextv = rev_vert(u, v + dv, rfunc, cls);
nuclear@0 551 Vector3 bitan = nextv - pos;
nuclear@0 552 if(bitan.length_sq() < 1e-6) {
nuclear@0 553 nextv = rev_vert(u, v - dv, rfunc, cls);
nuclear@0 554 bitan = pos - nextv;
nuclear@0 555 }
nuclear@0 556
nuclear@0 557 normal = cross_product(tang, bitan);
nuclear@0 558 }
nuclear@0 559
nuclear@0 560 *varr++ = pos;
nuclear@0 561 *narr++ = normal.normalized();
nuclear@0 562 *tarr++ = tang.normalized();
nuclear@0 563 *uvarr++ = Vector2(u, v);
nuclear@0 564
nuclear@0 565 if(i < usub && j < vsub) {
nuclear@0 566 int idx = i * vverts + j;
nuclear@0 567
nuclear@0 568 *idxarr++ = idx;
nuclear@0 569 *idxarr++ = idx + vverts + 1;
nuclear@0 570 *idxarr++ = idx + 1;
nuclear@0 571
nuclear@0 572 *idxarr++ = idx;
nuclear@0 573 *idxarr++ = idx + vverts;
nuclear@0 574 *idxarr++ = idx + vverts + 1;
nuclear@0 575 }
nuclear@0 576
nuclear@0 577 v += dv;
nuclear@0 578 }
nuclear@0 579 u += du;
nuclear@0 580 }
nuclear@0 581 }