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authorhugues <hugues@0f7e0d06-a6f9-0310-a55f-d5f984f55e4c>2006-03-25 15:07:51 +0000
committerHugues Hiegel <hugues@hiegel.fr>2008-03-18 10:06:55 +0100
commit56cc59cf44ec64440ba4d1c0d005196195c758e6 (patch)
tree0e4bc431438a05c2e32b8703a8c79dcbf26a7cbf /3d/perlin.cc
parentd49be924baa2759aefa5b5311a35adf50db48e12 (diff)
Nettoyage du repository glagenHEADmaster
git-svn-id: file:///usr/local/opt/svn/repos/glagen@12 0f7e0d06-a6f9-0310-a55f-d5f984f55e4c
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+//=============================================================================
+//
+// 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 <stdlib.h>
+#include <math.h>
+#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];
+ }
+}