… | |
… | |
226 | }; |
226 | }; |
227 | |
227 | |
228 | ///////////////////////////////////////////////////////////////////////////// |
228 | ///////////////////////////////////////////////////////////////////////////// |
229 | |
229 | |
230 | template<int N, typename T> |
230 | template<int N, typename T> |
231 | template<class random_generator> |
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232 | void |
231 | void |
233 | permutation<N,T>::seed (random_generator &rng) |
232 | permutation<N,T>::seed (seedable_rand_gen &rng) |
234 | { |
233 | { |
235 | for (int i = 0; i < N; ++i) |
234 | for (int i = 0; i < N; ++i) |
236 | pmap[i] = i; |
235 | pmap[i] = i; |
237 | |
236 | |
238 | // fisher-yates to randomly perturb |
237 | // fisher-yates to randomly perturb |
… | |
… | |
242 | |
241 | |
243 | template class permutation<256, uint8_t>; |
242 | template class permutation<256, uint8_t>; |
244 | |
243 | |
245 | ///////////////////////////////////////////////////////////////////////////// |
244 | ///////////////////////////////////////////////////////////////////////////// |
246 | |
245 | |
247 | static vec2d |
246 | template<class vec_t> |
248 | floor (vec2d v) |
247 | void |
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248 | noise_gen_base<vec_t>::seed (seedable_rand_gen &rng) |
249 | { |
249 | { |
250 | return vec2d (std::floor (v[0]), std::floor (v[1])); |
250 | for (int i = 0; i < array_length (rvmap); ++i) |
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251 | rvmap[i].seed (rng); |
251 | } |
252 | } |
252 | |
253 | |
253 | static vec3d |
254 | template<class vec_t> |
254 | floor (vec3d v) |
255 | void |
255 | { |
256 | noise_gen_base<vec_t>::seed (seed_t seed) |
256 | return vec3d (std::floor (v[0]), std::floor (v[1]), std::floor (v[2])); |
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257 | } |
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258 | |
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259 | noise_gen<vec2d>::noise_gen (uint32_t seed) |
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260 | { |
257 | { |
261 | seedable_rand_gen rng (seed); |
258 | seedable_rand_gen rng (seed); |
262 | |
259 | |
263 | rvmap[0].seed (rng); |
260 | this->seed (rng); |
264 | rvmap[1].seed (rng); |
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265 | } |
261 | } |
266 | |
262 | |
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263 | template<> |
267 | vec2d::T_numtype |
264 | vec2d::T_numtype |
268 | noise_gen<vec2d>::operator() (vec2d P) |
265 | noise_gen_base<vec2d>::operator() (vec2d P, uint32_t seed) |
269 | { |
266 | { |
270 | vec2d I = floor (P); |
267 | vec2d I = floor (P); |
271 | vec2d F = P - I; |
268 | vec2d F = P - I; |
272 | |
269 | |
273 | float v = 0; |
270 | value_t v = 0; |
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271 | |
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272 | uint8_t i1 = uint8_t (I[1]) ^ (seed >> 16); |
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273 | uint8_t i0 = uint8_t (I[0]) ^ (seed >> 8); |
274 | |
274 | |
275 | for (int j = -1; j <= 2; ++j) |
275 | for (int j = -1; j <= 2; ++j) |
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276 | { |
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277 | uint8_t h1 = rvmap[1](i1 + j) ^ seed; |
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278 | |
276 | for (int i = -1; i <= 2; ++i) |
279 | for (int i = -1; i <= 2; ++i) |
277 | { |
280 | { |
278 | vec2d A = F - vec2d (i, j); |
281 | vec2d A = F - vec2d (i, j); |
279 | |
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280 | float d = dot (A, A); |
282 | value_t d = dot (A, A); |
281 | |
283 | |
282 | if (d < 4) |
284 | if (d < 4) |
283 | { |
285 | { |
284 | float t1 = 1 - d / 4; |
286 | value_t t1 = 1 - d / 4; |
285 | float t2 = t1 * t1; |
287 | value_t t2 = t1 * t1; |
286 | float t4 = t2 * t2; |
288 | value_t t4 = t2 * t2; |
287 | |
289 | |
288 | float p = (4 * t1 - 3) * t4; |
290 | value_t p = (4 * t1 - 3) * t4; |
289 | |
291 | |
290 | int h = rvmap[0](I[0] + i) ^ rvmap[1](I[1] + j); |
292 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
291 | vec2d G = charges2[h & 0xff]; |
293 | vec2d G = charges2[h & 0xff]; |
292 | |
294 | |
293 | v += dot (A, G) * p; |
295 | v += dot (A, G) * p; |
294 | } |
296 | } |
295 | } |
297 | } |
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298 | } |
296 | |
299 | |
297 | return clamp (v, -.9999999, .9999999); |
300 | return v; |
298 | } |
301 | } |
299 | |
302 | |
300 | ///////////////////////////////////////////////////////////////////////////// |
303 | ///////////////////////////////////////////////////////////////////////////// |
301 | |
304 | |
302 | noise_gen<vec3d>::noise_gen (uint32_t seed) |
305 | template<> |
303 | { |
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304 | seedable_rand_gen rng (seed); |
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305 | |
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306 | rvmap [0].seed (rng); |
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307 | rvmap [1].seed (rng); |
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308 | rvmap [2].seed (rng); |
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309 | } |
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310 | |
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311 | vec3d::T_numtype |
306 | vec3d::T_numtype |
312 | noise_gen<vec3d>::operator() (vec3d P) |
307 | noise_gen_base<vec3d>::operator() (vec3d P, uint32_t seed) |
313 | { |
308 | { |
314 | vec3d I = floor (P); |
309 | vec3d I = floor (P); |
315 | vec3d F = P - I; |
310 | vec3d F = P - I; |
316 | |
311 | |
317 | float v = 0; |
312 | uint8_t i2 = uint8_t (I[2]) ^ (seed >> 24); |
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313 | uint8_t i1 = uint8_t (I[1]) ^ (seed >> 16); |
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314 | uint8_t i0 = uint8_t (I[0]) ^ (seed >> 8); |
318 | |
315 | |
319 | for (int j = -1; j <= 2; ++j) |
316 | value_t v = 0; |
320 | for (int i = -1; i <= 2; ++i) |
317 | |
321 | for (int k = -1; k <= 2; ++k) |
318 | for (int k = -1; k <= 2; ++k) |
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319 | { |
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320 | uint8_t h2 = rvmap[2](i2 + k) ^ seed; |
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321 | |
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322 | for (int j = -1; j <= 2; ++j) |
322 | { |
323 | { |
323 | vec3d A = F - vec3d (i, j, k); |
324 | uint8_t h1 = rvmap[1](i1 + j) ^ h2; |
324 | float d = dot (A, A); |
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325 | |
325 | |
326 | if (d < 4) |
326 | for (int i = -1; i <= 2; ++i) |
327 | { |
327 | { |
328 | float t1 = 1 - d / 4; |
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329 | float t2 = t1 * t1; |
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330 | float t4 = t2 * t2; |
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331 | |
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332 | // (4t⁵ - 3t⁴) |
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333 | float p = (4 * t1 - 3) * t4; |
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334 | |
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335 | int h = rvmap[0](I[0] + i) ^ rvmap[1](I[1] + j) ^ rvmap[2](I[2] + k); |
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336 | const float *G = charges3[h & 0xff]; |
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337 | |
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338 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
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339 | } |
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340 | } |
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341 | |
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342 | return clamp (v * 2, -.9999999, .9999999); |
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343 | } |
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344 | |
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345 | vec3d::T_numtype |
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346 | noise_gen<vec3d>::operator() (vec3d P, vec3d N) |
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347 | { |
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348 | vec3d I = floor (P); |
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349 | vec3d F = P - I; |
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350 | |
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351 | float v = 0; |
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352 | |
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353 | for (int j = -1; j <= 2; ++j) |
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354 | for (int i = -1; i <= 2; ++i) |
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355 | for (int k = -1; k <= 2; ++k) |
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356 | { |
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357 | vec3d D = F - vec3d (i, j, k); |
328 | vec3d A = F - vec3d (i, j, k); |
358 | float e = dot (D, N); |
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359 | float o = 1 - abs (e); |
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360 | |
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361 | if (o > 0) |
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362 | { |
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363 | vec3d A = D - e * N; |
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364 | float d = dot (A, A); |
329 | value_t d = dot (A, A); |
365 | |
330 | |
366 | if (d < 4) |
331 | if (d < 4) |
367 | { |
332 | { |
368 | float t1 = 1 - d / 4; |
333 | value_t t1 = 1 - d / 4; |
369 | float t2 = t1 * t1; |
334 | value_t t2 = t1 * t1; |
370 | float t4 = t2 * t2; |
335 | value_t t4 = t2 * t2; |
371 | |
336 | |
372 | float o2 = o * o; |
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373 | |
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374 | // (4t⁵ - 3t⁴) * (3o³ - 2o²) |
337 | // (4t⁵ - 3t⁴) |
375 | // alternative? ((o * 6 - 15) * o + 10) * o³ |
338 | value_t p = (4 * t1 - 3) * t4; |
376 | float p = (4 * t1 - 3) * t4 * (3 * o2 - 2 * o2 * o); |
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377 | |
339 | |
378 | int h = rvmap[0](I[0] + i) ^ rvmap[1](I[1] + j) ^ rvmap[2](I[2] + k); |
340 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
379 | const float *G = charges3[h & 0xff]; |
341 | const value_t *G = charges3[h & 0xff]; |
380 | |
342 | |
381 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
343 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
382 | } |
344 | } |
383 | } |
345 | } |
384 | } |
346 | } |
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347 | } |
385 | |
348 | |
386 | return clamp (v, -.9999999, .9999999); |
349 | return v * 2; |
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350 | } |
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351 | |
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352 | vec3d::T_numtype |
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353 | noise_gen<vec3d>::operator() (vec3d P, vec3d N, uint32_t seed) |
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354 | { |
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355 | vec3d I = floor (P); |
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356 | vec3d F = P - I; |
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357 | |
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358 | uint8_t i2 = uint8_t (I[2]) ^ (seed >> 24); |
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359 | uint8_t i1 = uint8_t (I[1]) ^ (seed >> 16); |
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360 | uint8_t i0 = uint8_t (I[0]) ^ (seed >> 8); |
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361 | |
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362 | value_t v = 0; |
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363 | |
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364 | for (int k = -1; k <= 2; ++k) |
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365 | { |
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366 | uint8_t h2 = rvmap[2](i2 + k) ^ seed; |
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367 | |
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368 | for (int j = -1; j <= 2; ++j) |
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369 | { |
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370 | uint8_t h1 = rvmap[1](i1 + j) ^ h2; |
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371 | |
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372 | for (int i = -1; i <= 2; ++i) |
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373 | { |
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374 | vec3d D = F - vec3d (i, j, k); |
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375 | value_t e = dot (D, N); |
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376 | value_t o = 1 - abs (e); |
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377 | |
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378 | if (o > 0) |
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379 | { |
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380 | vec3d A = D - e * N; |
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381 | value_t d = dot (A, A); |
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382 | |
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383 | if (d < 4) |
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384 | { |
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385 | value_t t1 = 1 - d / 4; |
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386 | value_t t2 = t1 * t1; |
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387 | value_t t4 = t2 * t2; |
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388 | |
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389 | value_t o2 = o * o; |
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390 | |
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391 | // (4t⁵ - 3t⁴) * (3o³ - 2o²) |
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392 | // alternative? ((o * 6 - 15) * o + 10) * o³ |
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393 | value_t p = (4 * t1 - 3) * t4 * (3 * o2 - 2 * o2 * o); |
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394 | |
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395 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
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396 | const value_t *G = charges3[h & 0xff]; |
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397 | |
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398 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
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399 | } |
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400 | } |
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401 | } |
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402 | } |
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403 | } |
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404 | |
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405 | return v; |
387 | } |
406 | } |
388 | |
407 | |
389 | template class noise_gen<vec2d>; |
408 | template class noise_gen<vec2d>; |
390 | template class noise_gen<vec3d>; |
409 | template class noise_gen<vec3d>; |
391 | |
410 | |
392 | ///////////////////////////////////////////////////////////////////////////// |
411 | ///////////////////////////////////////////////////////////////////////////// |
393 | |
412 | |
394 | // find some uncorrelated spot - we assume that noise 2 units away |
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|
395 | // is completely uncorrelated - this is not true for other coordinates, |
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|
396 | // but generally works well. |
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|
397 | template<class vec_t> |
413 | template<class vec_t> |
398 | static vec_t |
414 | frac_gen<vec_t>::frac_gen (int octaves, value_t lacunarity, value_t hurst_expo, seed_t seed) |
399 | ith_octave (vec_t P, int i) |
415 | : octaves (octaves), lac (lacunarity), h (hurst_expo) |
400 | { |
416 | { |
401 | vec_t r = P; |
417 | this->seed (seed); |
402 | r[0] += i; |
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|
403 | r[1] += i * 2; |
|
|
404 | return r; |
|
|
405 | } |
|
|
406 | |
418 | |
407 | template<class vec_t> |
|
|
408 | frac_gen<vec_t>::frac_gen (value_t hurst_expo, value_t lacunarity) |
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|
409 | : h (hurst_expo), lac (lacunarity), noise_gen<vec_t> (0) |
|
|
410 | { |
|
|
411 | value_t exsum = 0; |
419 | value_t exsum = 0; |
412 | value_t phi = noise (vec_t (value_t (0))) * 0.5 + 1; |
420 | value_t phi = noise (vec_t (value_t (0))) * 0.5 + 1; |
413 | |
421 | |
414 | for (int i = 0; i < MAX_OCTAVES; ++i) |
422 | for (int i = 0; i < octaves; ++i) |
415 | { |
423 | { |
416 | ex [i] = pow (lac, -h * i); |
424 | ex [i] = pow (lac, -h * i); |
417 | exsum += ex [i]; |
425 | exsum += ex [i]; |
418 | fbm_mul [i] = 0.5 / (exsum * 0.75); // .75 is a heuristic |
426 | fbm_mul [i] = 0.5 / (exsum * 0.75); // .75 is a heuristic |
419 | rot [i].set (phi * i + 1); |
427 | rot [i].set (phi * i + 1); |
420 | } |
428 | } |
421 | } |
429 | } |
422 | |
430 | |
423 | template<class vec_t> |
431 | template<class vec_t> |
424 | typename frac_gen<vec_t>::value_t |
432 | typename frac_gen<vec_t>::value_t |
425 | frac_gen<vec_t>::fBm (vec_t P, int octaves) |
433 | frac_gen<vec_t>::fBm (vec_t P) |
426 | { |
434 | { |
427 | value_t v = 0; |
435 | value_t v = 0; |
428 | |
436 | |
429 | for (int i = 0; i < octaves; ++i) |
437 | for (int i = 0; i < octaves; ++i) |
430 | { |
438 | { |
431 | rot [i](P); |
439 | rot [i](P); |
432 | v += noise (ith_octave (P, i)) * ex [i]; |
440 | v += noise (P, i) * ex [i]; |
433 | P *= lac; |
441 | P *= lac; |
434 | } |
442 | } |
435 | |
443 | |
436 | return clamp<value_t> (v * fbm_mul [octaves - 1] + 0.5, 0, .9999999); |
444 | return v * fbm_mul [octaves - 1]; |
437 | } |
445 | } |
438 | |
446 | |
439 | template<class vec_t> |
447 | template<class vec_t> |
440 | typename frac_gen<vec_t>::value_t |
448 | typename frac_gen<vec_t>::value_t |
441 | frac_gen<vec_t>::turbulence (vec_t P, int octaves) |
449 | frac_gen<vec_t>::turbulence (vec_t P) |
442 | { |
450 | { |
443 | value_t v = 0; |
451 | value_t v = 0; |
444 | |
452 | |
445 | for (int i = 0; i < octaves; ++i) |
453 | for (int i = 0; i < octaves; ++i) |
446 | { |
454 | { |
447 | rot [i](P); |
455 | rot [i](P); |
448 | v += abs (noise (ith_octave (P, i))) * ex [i]; |
456 | v += abs (noise (P, i)) * ex [i]; |
449 | P *= lac; |
457 | P *= lac; |
450 | } |
458 | } |
451 | |
459 | |
452 | return clamp<value_t> (v * fbm_mul [octaves - 1] * (0.5 / noise_gen<vec_t>::abs_avg ()), 0, .9999999); |
460 | return v * fbm_mul [octaves - 1] * (0.5 / noise_gen<vec_t>::abs_avg ()); |
453 | } |
461 | } |
454 | |
462 | |
455 | template<class vec_t> |
463 | template<class vec_t> |
456 | typename frac_gen<vec_t>::value_t |
464 | typename frac_gen<vec_t>::value_t |
457 | frac_gen<vec_t>::multifractal (vec_t P, int octaves, value_t offset) |
465 | frac_gen<vec_t>::multifractal (vec_t P, value_t offset) |
458 | { |
466 | { |
459 | value_t v = 1; |
467 | value_t v = 1; |
460 | |
468 | |
461 | for (int i = 0; i < octaves; ++i) |
469 | for (int i = 0; i < octaves; ++i) |
462 | { |
470 | { |
463 | rot [i](P); |
471 | rot [i](P); |
464 | v *= noise (P) * ex [i] + offset; |
472 | v *= noise (P) * ex [i] + offset; |
465 | P *= lac; |
473 | P *= lac; |
466 | } |
474 | } |
467 | |
475 | |
468 | return clamp<value_t> (v * 0.5, 0, .9999999); |
476 | return v * value_t (0.5); |
469 | } |
477 | } |
470 | |
478 | |
471 | template<class vec_t> |
479 | template<class vec_t> |
472 | typename frac_gen<vec_t>::value_t |
480 | typename frac_gen<vec_t>::value_t |
473 | frac_gen<vec_t>::heterofractal (vec_t P, int octaves, value_t offset) |
481 | frac_gen<vec_t>::heterofractal (vec_t P, value_t offset) |
474 | { |
482 | { |
475 | value_t v = noise (P) + offset; |
483 | value_t v = noise (P) + offset; |
476 | |
484 | |
477 | for (int i = 1; i < octaves; ++i) |
485 | for (int i = 1; i < octaves; ++i) |
478 | { |
486 | { |
… | |
… | |
484 | return v / (1 << octaves); |
492 | return v / (1 << octaves); |
485 | } |
493 | } |
486 | |
494 | |
487 | template<class vec_t> |
495 | template<class vec_t> |
488 | typename frac_gen<vec_t>::value_t |
496 | typename frac_gen<vec_t>::value_t |
489 | frac_gen<vec_t>::hybridfractal (vec_t P, int octaves, value_t offset, value_t gain) |
497 | frac_gen<vec_t>::hybridfractal (vec_t P, value_t offset, value_t gain) |
490 | { |
498 | { |
491 | value_t v = (noise (P) + offset) * ex [0]; |
499 | value_t v = (noise (P) + offset) * ex [0]; |
492 | value_t weight = v; |
500 | value_t weight = v; |
493 | |
501 | |
494 | for (int i = 1; i < octaves; ++i) |
502 | for (int i = 1; i < octaves; ++i) |
… | |
… | |
501 | value_t sig = (noise (P) + offset) * ex [i]; |
509 | value_t sig = (noise (P) + offset) * ex [i]; |
502 | v += weight * sig; |
510 | v += weight * sig; |
503 | weight *= gain * sig; |
511 | weight *= gain * sig; |
504 | } |
512 | } |
505 | |
513 | |
506 | return clamp<value_t> (v * 0.5 + 0.5, 0, .9999999); |
514 | return v * value_t (0.5) + value_t (0.5); |
507 | } |
515 | } |
508 | |
516 | |
509 | template<class vec_t> |
517 | template<class vec_t> |
510 | typename frac_gen<vec_t>::value_t |
518 | typename frac_gen<vec_t>::value_t |
511 | frac_gen<vec_t>::ridgedmultifractal (vec_t P, int octaves, value_t offset, value_t gain) |
519 | frac_gen<vec_t>::ridgedmultifractal (vec_t P, value_t offset, value_t gain) |
512 | { |
520 | { |
513 | value_t sig = offset - abs (noise (P)); |
521 | value_t sig = offset - abs (noise (P)); |
514 | sig *= sig; |
522 | sig *= sig; |
515 | value_t v = sig; |
523 | value_t v = sig; |
516 | |
524 | |
517 | for (int i = 1; i < octaves; ++i) |
525 | for (int i = 1; i < octaves; ++i) |
518 | { |
526 | { |
519 | rot [i](P); |
527 | rot [i](P); |
520 | P *= lac; |
528 | P *= lac; |
521 | |
529 | |
|
|
530 | // weight higher octaves by previous signal |
522 | value_t w = clamp (sig * gain, 0, 1); |
531 | value_t w = clamp (sig * gain, 0, 1); |
523 | |
532 | |
524 | sig = offset - abs (noise (P)); |
533 | sig = offset - abs (noise (P)); |
525 | sig *= sig; |
534 | sig *= sig; |
526 | sig *= w; |
535 | sig *= w; |
527 | |
536 | |
528 | v += sig * ex [i]; |
537 | v += sig * ex [i]; |
529 | } |
538 | } |
530 | |
539 | |
531 | return clamp<value_t> (v * 0.25, 0, .9999999); |
540 | return v * value_t (0.25); |
532 | } |
541 | } |
533 | |
542 | |
534 | template<class vec_t> |
543 | template<class vec_t> |
535 | typename frac_gen<vec_t>::value_t |
544 | typename frac_gen<vec_t>::value_t |
536 | frac_gen<vec_t>::billowfractal (vec_t P, int octaves, value_t offset, value_t gain) |
545 | frac_gen<vec_t>::billowfractal (vec_t P, value_t offset, value_t gain) |
537 | { |
546 | { |
538 | value_t v = 0; |
547 | value_t v = 0; |
539 | |
548 | |
540 | offset += 2 * noise_gen<vec_t>::abs_avg () - 1; |
549 | offset += 2 * noise_gen<vec_t>::abs_avg () - 1; |
541 | |
550 | |
542 | for (int i = 0; i < octaves; ++i) |
551 | for (int i = 0; i < octaves; ++i) |
543 | { |
552 | { |
544 | rot [i](P); |
553 | rot [i](P); |
545 | v += (abs (noise (ith_octave (P, i))) * gain - offset) * ex [i]; |
554 | v += (abs (noise (P, i)) * gain - offset) * ex [i]; |
546 | P *= lac; |
555 | P *= lac; |
547 | } |
556 | } |
548 | |
557 | |
549 | return clamp<value_t> (v, -.9999999, .9999999); |
558 | return v; |
550 | } |
559 | } |
551 | |
560 | |
552 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
561 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
553 | template<class vec_t> |
562 | template<class vec_t> |
554 | typename frac_gen<vec_t>::value_t |
563 | typename frac_gen<vec_t>::value_t |
555 | frac_gen<vec_t>::terrain (vec_t P, int octaves) |
564 | frac_gen<vec_t>::terrain (vec_t P) |
556 | { |
565 | { |
557 | value_t v = 0; |
566 | value_t v = 0; |
558 | |
567 | |
559 | for (int i = 0; i < octaves; ++i) |
568 | for (int i = 0; i < octaves; ++i) |
560 | { |
569 | { |
… | |
… | |
568 | return v <= 0 ? - pow (-v, 0.7) : pow (v, 1 + noise (P) * v); |
577 | return v <= 0 ? - pow (-v, 0.7) : pow (v, 1 + noise (P) * v); |
569 | } |
578 | } |
570 | |
579 | |
571 | template<class vec_t> |
580 | template<class vec_t> |
572 | typename frac_gen<vec_t>::value_t |
581 | typename frac_gen<vec_t>::value_t |
573 | frac_gen<vec_t>::terrain2 (vec_t P, int octaves) |
582 | frac_gen<vec_t>::terrain2 (vec_t P) |
574 | { |
583 | { |
575 | value_t a = fBm (P, octaves); |
584 | value_t a = fBm (P); |
576 | value_t b = ridgedmultifractal (P, octaves, 1, 8); |
585 | value_t b = ridgedmultifractal (P, 1, 8); |
577 | value_t fade = fBm (P + vec_t(10.3), octaves); |
586 | value_t fade = fBm (P + vec_t(10.3)); |
578 | |
587 | |
579 | const value_t width = 0.05; |
588 | const value_t width = 0.05; |
580 | |
589 | |
581 | if (fade > 0.5 + width) |
590 | if (fade > 0.5 + width) |
582 | return a; |
591 | return a; |
… | |
… | |
597 | ///////////////////////////////////////////////////////////////////////////// |
606 | ///////////////////////////////////////////////////////////////////////////// |
598 | |
607 | |
599 | void noise_test (); |
608 | void noise_test (); |
600 | void noise_test () |
609 | void noise_test () |
601 | { |
610 | { |
602 | frac_gen<vec2d> gen (0.5, 1.9); |
611 | frac2d gen; |
603 | frac_gen<vec3d> gen3; |
612 | |
|
|
613 | frac2d vec_gen1 (4, 2, 0.5, 1); |
|
|
614 | frac2d vec_gen2 (4, 2, 0.5, 2); |
604 | |
615 | |
605 | #if 1 |
616 | #if 1 |
606 | int N = 1024; |
617 | int N = 1024; |
607 | |
618 | |
608 | printf ("P5 %d %d 255\n", N, N); |
619 | printf ("P6 %d %d 255\n", N, N); |
609 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
620 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
610 | for (int y = 0; y < N; ++y) |
621 | for (int y = 0; y < N; ++y) |
611 | { |
622 | { |
612 | if (!(y&63))fprintf (stderr, "y %d\n", y);//D |
623 | if (!(y&63))fprintf (stderr, "y %d\n", y);//D |
613 | for (int x = 0; x < N; ++x) |
624 | for (int x = 0; x < N; ++x) |
614 | { |
625 | { |
|
|
626 | vec2d P = vec2d (x, y) * (25000.f / N); |
|
|
627 | |
615 | //putc (127 * gen.noise (vec2d (x * 0.01, y * 0.01)) + 128, stdout); |
628 | //putc (127 * gen.noise (vec2d (x * 0.01, y * 0.01)) + 128, stdout); |
616 | //putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
629 | //putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
617 | //putc (256 * gen.fBm (vec2d(x * 0.01, y * 0.01), 16), stdout); |
630 | //putc (256 * gen.fBm (vec2d(x * 0.01, y * 0.01), 16), stdout); |
618 | putc (256 * gen.turbulence (vec2d (x * 0.004 - 1, y * 0.004 - 1), 10), stdout); |
631 | //putc (256 * gen.turbulence (vec2d (x * 0.004 - 1, y * 0.004 - 1), 10), stdout); |
619 | //putc (256 * gen.heterofractal (vec2d (x * 0.008, y * 0.008), 8, 0.9), stdout); |
632 | //putc (256 * gen.heterofractal (vec2d (x * 0.008, y * 0.008), 8, 0.9), stdout); |
620 | |
633 | |
621 | // mountais or somesuch(?) |
634 | // mountais or somesuch(?) |
622 | //putc (256 * gen.hybridfractal (vec2d (x * 0.01, y * 0.01), 8, -.4, -4), stdout); |
635 | //putc (256 * gen.hybridfractal (vec2d (x * 0.01, y * 0.01), 8, -.4, -4), stdout); |
623 | |
636 | |
624 | // temperature |
637 | // temperature |
625 | //putc (256 * gen.fBm (vec2d (x * 0.002, y * 0.002), 2), stdout); |
638 | //putc (256 * gen.fBm (vec2d (x * 0.002, y * 0.002), 2), stdout); |
626 | // rain |
639 | // rain |
627 | |
640 | |
628 | putc (127.5 * gen.ridgedmultifractal (vec2d (x * 0.01, y * 0.01), 1, 1, 1); |
641 | float continent; |
|
|
642 | |
|
|
643 | { |
|
|
644 | const float continent_scale = 0.00008; |
|
|
645 | |
|
|
646 | vec2d perturb ( |
|
|
647 | vec_gen1.fBm (P * 0.0004), |
|
|
648 | vec_gen2.fBm (P * 0.0004) |
|
|
649 | ); |
|
|
650 | |
|
|
651 | const float W = 1000 * continent_scale; |
|
|
652 | const float N = (25000 - 1) * continent_scale; |
|
|
653 | |
|
|
654 | static frac2d perturb_gen (4, 2, 0.5, 3); |
|
|
655 | float perturb_perturb = gen.fBm (P * 0.0004); |
|
|
656 | perturb_perturb = perturb_perturb * perturb_perturb * 0.004; |
|
|
657 | |
|
|
658 | vec2d P_perturb = P * continent_scale + perturb * min (W, gen.noise (P * perturb_perturb) * W * 8); |
|
|
659 | |
|
|
660 | static frac2d continent_gen (13, 2.13, 0.5); |
|
|
661 | continent = continent_gen.fBm (P_perturb) + 0.05f; |
|
|
662 | |
|
|
663 | float border = W; // within n places of the border |
|
|
664 | |
|
|
665 | min_it (border, P_perturb [0]); |
|
|
666 | min_it (border, N - P_perturb [0]); |
|
|
667 | min_it (border, P_perturb [1]); |
|
|
668 | min_it (border, N - P_perturb [1]); |
|
|
669 | |
|
|
670 | continent = blend (-1.f, continent, border, 0.f, W); |
|
|
671 | } |
|
|
672 | |
|
|
673 | vec3d c (1, 1, 1); |
|
|
674 | float v; |
|
|
675 | |
|
|
676 | if (continent < 0) |
|
|
677 | { |
|
|
678 | // ocean |
|
|
679 | |
|
|
680 | v = min (continent * 10, -0.2f); |
|
|
681 | c = vec3d (0, 0, 1); |
|
|
682 | } |
|
|
683 | else |
|
|
684 | { |
|
|
685 | // continent |
|
|
686 | |
|
|
687 | // big rivers |
|
|
688 | static frac2d river_gen (2); |
|
|
689 | float river1 = river_gen.fBm (P * 0.0004);// - (P[0] / 25000) * 0.18 + 0.06; |
|
|
690 | float river2 = river_gen.ridgedmultifractal (P * 0.04 + vec2d (3, 5), 0.8, 10) - (P[1] / 25000) * 0.1; |
|
|
691 | |
|
|
692 | if (river1 > 0.05f) |
|
|
693 | { |
|
|
694 | v = -0.1f; |
|
|
695 | c = vec3d (0.4, 0.4, 1); |
|
|
696 | } |
|
|
697 | else if (river1 > 0.08f && river2 > 0.1f) |
|
|
698 | { |
|
|
699 | v = -0.05f; |
|
|
700 | c = vec3d (0.4, 0.4, 1); |
|
|
701 | } |
|
|
702 | else |
|
|
703 | { |
|
|
704 | river1 -= 0.07f; |
|
|
705 | |
|
|
706 | //c = river1 > 0 ? vec3d (0.8, 0.8, 0) : vec3d (0.8, 0, 0); |
|
|
707 | c = blend0 (vec3d (0.8, 0, 0), vec3d (0.8, 0.8, 0), river1, 0.01f);; |
|
|
708 | |
|
|
709 | static frac2d mountain_gen (8, 2.14, 0.5); |
|
|
710 | float mountain = mountain_gen.ridgedmultifractal (P * 0.004); |
|
|
711 | v = blend0 (mountain * 3 - 1, continent, river1, 0.05f); |
|
|
712 | } |
|
|
713 | |
|
|
714 | v=abs(river1) < 0.1; |
|
|
715 | c=vec3d(1,1,1); |
|
|
716 | } |
|
|
717 | |
|
|
718 | c *= v * 0.5 + 0.5; |
|
|
719 | |
|
|
720 | putc (clamp<int> (255 * c[0], 0, 255), stdout); |
|
|
721 | putc (clamp<int> (255 * c[1], 0, 255), stdout); |
|
|
722 | putc (clamp<int> (255 * c[2], 0, 255), stdout); |
629 | |
723 | |
630 | //cells |
724 | //cells |
631 | //putc (127.49 * gen.billowfractal (vec2d (x * 0.01, y * 0.01), 9) + 128, stdout); |
725 | //putc (127.49 * gen.billowfractal (vec2d (x * 0.01, y * 0.01), 9) + 128, stdout); |
632 | } |
726 | } |
633 | } |
727 | } |
634 | #else |
728 | #else |
635 | int N = 512; |
729 | int N = 128; |
636 | |
730 | |
637 | //printf ("P6 %d %d 255\n", N, N); |
731 | //printf ("P6 %d %d 255\n", N, N); |
638 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
732 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
|
|
733 | frac3d gen3 (3);; |
639 | for (int z = 0; z < N; ++z) |
734 | for (int z = 0; z < N; ++z) |
640 | { |
735 | { |
641 | if (!(z&7))fprintf (stderr, "z %d\n", z);//D |
736 | if (!(z&7))fprintf (stderr, "z %d\n", z);//D |
642 | for (int y = 0; y < N; ++y) |
737 | for (int y = 0; y < N; ++y) |
643 | for (int x = 0; x < N; ++x) |
738 | for (int x = 0; x < N; ++x) |
644 | { |
739 | { |
645 | float v = gen3.ridgedmultifractal (vec3d (x * 0.01 + 0.2, y * 0.01 + 0.2, z * 0.01 + 0.2), 3, 1.03, 2) * 2; |
740 | float v = gen3.ridgedmultifractal (vec3d (x * 0.001 + 0.2, y * 0.001 + 0.2, z * 0.01 + 0.2), 1.03, 2) * 2; |
646 | |
741 | |
647 | #if 0 |
742 | #if 0 |
648 | if (z < 64) |
743 | if (z < 64) |
649 | v = v * (z * z) / (64 * 64); |
744 | v = v * (z * z) / (64 * 64); |
650 | #endif |
745 | #endif |
651 | |
746 | |
652 | if (v <= 0.9999) |
747 | if (v <= 0.9) |
653 | continue; |
748 | continue; |
654 | |
749 | |
655 | float r[4]; |
750 | float r[4]; |
656 | int i[4]; |
751 | int i[4]; |
657 | |
752 | |