From 56cc59cf44ec64440ba4d1c0d005196195c758e6 Mon Sep 17 00:00:00 2001 From: hugues Date: Sat, 25 Mar 2006 15:07:51 +0000 Subject: Nettoyage du repository glagen git-svn-id: file:///usr/local/opt/svn/repos/glagen@12 0f7e0d06-a6f9-0310-a55f-d5f984f55e4c --- 3d/perlin.cc | 347 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 347 insertions(+) create mode 100644 3d/perlin.cc (limited to '3d/perlin.cc') diff --git a/3d/perlin.cc b/3d/perlin.cc new file mode 100644 index 0000000..5cb4aee --- /dev/null +++ b/3d/perlin.cc @@ -0,0 +1,347 @@ +//============================================================================= +// +// Glagen : a planet sized landscape generator +// Copyright (C) 2002 Julien Guertault, Hugues Hiegel, Meng-Tih Lam +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +// +//============================================================================= +// +// Glagen : GPL LAndscape GENerator +// +// perlin.cc for Glagen : made by Zavie (Julien Guertault) +// +// www.glagen.org +// +//============================================================================= + +// Original implementation fo Perlin noice. +// It can be found on : +// http://mrl.nyu.edu/~perlin/doc/oscar.html#noise +// +// The 4th dimension noise has been added for our needs + +// coherent noise function over 1, 2 or 3 dimensions +// (copyright Ken Perlin) + +#include +#include +#include "data_glagen.hh" + +#define B 0x100 +#define BM 0xff + +#define N 0x1000 +#define NP 12 /* 2^N */ +#define NM 0xfff + +static int p[B + B + 2]; +static float g4[B + B + 2][4]; +static float g3[B + B + 2][3]; +static float g2[B + B + 2][2]; +static float g1[B + B + 2]; + +#define s_curve(t) ( t * t * (3. - 2. * t) ) + +#define lerp(t, a, b) ( a + t * (b - a) ) + +#define setup(i,b0,b1,r0,r1)\ + t = vec[i] + N;\ + b0 = ((int)t) & BM;\ + b1 = (b0+1) & BM;\ + r0 = t - (int)t;\ + r1 = r0 - 1.; + +float GLG_Perlin_noise_1D (float arg) +{ + int bx0, bx1; + float rx0, rx1; + float sx; + float t, u, v; + float vec[1]; + + vec[0] = arg; + + setup(0, bx0,bx1, rx0,rx1); + + sx = s_curve(rx0); + + u = rx0 * g1[ p[ bx0 ] ]; + v = rx1 * g1[ p[ bx1 ] ]; + + return lerp(sx, u, v); +} + +float GLG_Perlin_noise_2D (float vec[2]) +{ + int bx0, bx1; + int by0, by1; + int b00, b10, b01, b11; + float rx0, rx1; + float ry0, ry1; + float *q, sx, sy; + float a, b; + float t, u, v; + register int i, j; + + setup(0, bx0,bx1, rx0,rx1); + setup(1, by0,by1, ry0,ry1); + + i = p[ bx0 ]; + j = p[ bx1 ]; + + b00 = p[ i + by0 ]; + b10 = p[ j + by0 ]; + b01 = p[ i + by1 ]; + b11 = p[ j + by1 ]; + + sx = s_curve(rx0); + sy = s_curve(ry0); + +#define at2(rx,ry) ( rx * q[0] + ry * q[1] ) + + q = g2[ b00 ] ; u = at2(rx0,ry0); + q = g2[ b10 ] ; v = at2(rx1,ry0); + a = lerp(sx, u, v); + + q = g2[ b01 ] ; u = at2(rx0,ry1); + q = g2[ b11 ] ; v = at2(rx1,ry1); + b = lerp(sx, u, v); + + return lerp(sy, a, b); +} + +float GLG_Perlin_noise_3D (float vec[3]) +{ + int bx0, bx1; + int by0, by1; + int bz0, bz1; + int b00, b10, b01, b11; + float rx0, rx1; + float ry0, ry1; + float rz0, rz1; + float *q, sy, sz; + float a, b, c, d; + float t, u, v; + register int i, j; + + setup(0, bx0,bx1, rx0,rx1); + setup(1, by0,by1, ry0,ry1); + setup(2, bz0,bz1, rz0,rz1); + + i = p[ bx0 ]; + j = p[ bx1 ]; + + b00 = p[ i + by0 ]; + b10 = p[ j + by0 ]; + b01 = p[ i + by1 ]; + b11 = p[ j + by1 ]; + + t = s_curve(rx0); + sy = s_curve(ry0); + sz = s_curve(rz0); + +#define at3(rx,ry,rz) ( rx * q[0] + ry * q[1] + rz * q[2] ) + + q = g3[ b00 + bz0 ] ; u = at3(rx0,ry0,rz0); + q = g3[ b10 + bz0 ] ; v = at3(rx1,ry0,rz0); + a = lerp(t, u, v); + + q = g3[ b01 + bz0 ] ; u = at3(rx0,ry1,rz0); + q = g3[ b11 + bz0 ] ; v = at3(rx1,ry1,rz0); + b = lerp(t, u, v); + + c = lerp(sy, a, b); + + q = g3[ b00 + bz1 ] ; u = at3(rx0,ry0,rz1); + q = g3[ b10 + bz1 ] ; v = at3(rx1,ry0,rz1); + a = lerp(t, u, v); + + q = g3[ b01 + bz1 ] ; u = at3(rx0,ry1,rz1); + q = g3[ b11 + bz1 ] ; v = at3(rx1,ry1,rz1); + b = lerp(t, u, v); + + d = lerp(sy, a, b); + + return lerp(sz, c, d); +} + +float GLG_Perlin_noise_4D (float vec[4]) +{ + int bx0, bx1; + int by0, by1; + int bz0, bz1; + int bt0, bt1; + register int a0, a1; + int b00, b10, b01, b11; + int c000, c001, c010, c011, c100, c101, c110, c111; + float rx0, rx1; + float ry0, ry1; + float rz0, rz1; + float rt0, rt1; + float *q, sx, sy, sz, st; + float a, b, c, d, e, f; + float t, u, v; + + setup(0, bx0,bx1, rx0,rx1); + setup(1, by0,by1, ry0,ry1); + setup(2, bz0,bz1, rz0,rz1); + setup(3, bt0,bt1, rt0,rt1); + + a0 = p[ bx0 ]; + a1 = p[ bx1 ]; + + b00 = p[ a0 + by0 ]; + b10 = p[ a1 + by0 ]; + b01 = p[ a0 + by1 ]; + b11 = p[ a1 + by1 ]; + + c000 = p[ b00 + bz0 ]; + c100 = p[ b10 + bz0 ]; + c010 = p[ b01 + bz0 ]; + c110 = p[ b11 + bz0 ]; + c001 = p[ b00 + bz1 ]; + c101 = p[ b10 + bz1 ]; + c011 = p[ b01 + bz1 ]; + c111 = p[ b11 + bz1 ]; + + sx = s_curve(rx0); + sy = s_curve(ry0); + sz = s_curve(rz0); + st = s_curve(rt0); + +#define at4(rx, ry, rz, rt) ( rx * q[0] + ry * q[1] + rz * q[2] + rt * q[3]) + + q = g4[c000 + bt0]; u = at4(rx0, ry0, rz0, rt0); + q = g4[c100 + bt0]; v = at4(rx1, ry0, rz0, rt0); + a = lerp(sx, u, v); + + q = g4[c010 + bt0]; u = at4(rx0, ry1, rz0, rt0); + q = g4[c110 + bt0]; v = at4(rx1, ry1, rz0, rt0); + b = lerp(sx, u, v); + + c = lerp (sy, a, b); + + q = g4[c001 + bt0]; u = at4(rx0, ry0, rz1, rt0); + q = g4[c101 + bt0]; v = at4(rx1, ry0, rz1, rt0); + a = lerp(sx, u, v); + + q = g4[c011 + bt0]; u = at4(rx0, ry1, rz1, rt0); + q = g4[c111 + bt0]; v = at4(rx1, ry1, rz1, rt0); + b = lerp(sx, u, v); + + d = lerp (sy, a, b); + + + e = lerp (sz, c, d); + + + q = g4[c000 + bt1]; u = at4(rx0, ry0, rz0, rt1); + q = g4[c100 + bt1]; v = at4(rx1, ry0, rz0, rt1); + a = lerp(sx, u, v); + + q = g4[c010 + bt1]; u = at4(rx0, ry1, rz0, rt1); + q = g4[c110 + bt1]; v = at4(rx1, ry1, rz0, rt1); + b = lerp(sx, u, v); + + c = lerp (sy, a, b); + + q = g4[c001 + bt1]; u = at4(rx0, ry0, rz1, rt1); + q = g4[c101 + bt1]; v = at4(rx1, ry0, rz1, rt1); + a = lerp(sx, u, v); + + q = g4[c011 + bt1]; u = at4(rx0, ry1, rz1, rt1); + q = g4[c111 + bt1]; v = at4(rx1, ry1, rz1, rt1); + b = lerp(sx, u, v); + + d = lerp (sy, a, b); + + + f = lerp (sz, c, d); + + + return lerp (st, e, f); +} + +static void normalize2 (float v[2]) +{ + float s; + + s = sqrtf(v[0] * v[0] + v[1] * v[1]); + v[0] = v[0] / s; + v[1] = v[1] / s; +} + +static void normalize3 (float v[3]) +{ + float s; + + s = sqrtf(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]); + v[0] = v[0] / s; + v[1] = v[1] / s; + v[2] = v[2] / s; +} + +static void normalize4 (float v[4]) +{ + float s; + + s = sqrtf(v[0] * v[0] + v[1] * v[1] + v[2] * v[2] + v[3] * v[3]); + v[0] = v[0] / s; + v[1] = v[1] / s; + v[2] = v[2] / s; + v[3] = v[3] / s; +} + +void Perlin_init () +{ + int i, j, k; + + for (i = 0 ; i < B ; i++) + { + p[i] = i; + + g1[i] = (float)((rand() % (B + B)) - B) / B; + + for (j = 0 ; j < 2 ; j++) + g2[i][j] = (float)((rand() % (B + B)) - B) / B; + normalize2(g2[i]); + + for (j = 0 ; j < 3 ; j++) + g3[i][j] = (float)((rand() % (B + B)) - B) / B; + normalize3(g3[i]); + + for (j = 0 ; j < 4 ; j++) + g4[i][j] = (float)((rand() % (B + B)) - B) / B; + normalize4(g4[i]); + } + + while (--i) + { + k = p[i]; + p[i] = p[j = rand() % B]; + p[j] = k; + } + + for (i = 0 ; i < B + 2 ; i++) + { + p[B + i] = p[i]; + g1[B + i] = g1[i]; + for (j = 0 ; j < 2 ; j++) + g2[B + i][j] = g2[i][j]; + for (j = 0 ; j < 3 ; j++) + g3[B + i][j] = g3[i][j]; + } +} -- cgit v1.2.3