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-rw-r--r--indra/llmath/llperlin.cpp370
1 files changed, 185 insertions, 185 deletions
diff --git a/indra/llmath/llperlin.cpp b/indra/llmath/llperlin.cpp
index e1da2bf92b..1fcad07f49 100644
--- a/indra/llmath/llperlin.cpp
+++ b/indra/llmath/llperlin.cpp
@@ -1,24 +1,24 @@
-/**
+/**
* @file llperlin.cpp
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
- *
+ *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
- *
+ *
* This library 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
* Lesser General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
+ *
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
@@ -44,69 +44,69 @@ bool LLPerlinNoise::sInitialized = 0;
static void normalize2(F32 v[2])
{
- F32 s = 1.f/(F32)sqrt(v[0] * v[0] + v[1] * v[1]);
- v[0] = v[0] * s;
- v[1] = v[1] * s;
+ F32 s = 1.f/(F32)sqrt(v[0] * v[0] + v[1] * v[1]);
+ v[0] = v[0] * s;
+ v[1] = v[1] * s;
}
static void normalize3(F32 v[3])
{
- F32 s = 1.f/(F32)sqrt(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;
+ F32 s = 1.f/(F32)sqrt(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 fast_setup(F32 vec, U8 &b0, U8 &b1, F32 &r0, F32 &r1)
{
- S32 t_S32;
-
- r1 = vec + NF32;
- t_S32 = lltrunc(r1);
- b0 = (U8)t_S32;
- b1 = b0 + 1;
- r0 = r1 - t_S32;
- r1 = r0 - 1.f;
+ S32 t_S32;
+
+ r1 = vec + NF32;
+ t_S32 = lltrunc(r1);
+ b0 = (U8)t_S32;
+ b1 = b0 + 1;
+ r0 = r1 - t_S32;
+ r1 = r0 - 1.f;
}
void LLPerlinNoise::init(void)
{
- int i, j, k;
-
- for (i = 0 ; i < B ; i++)
- {
- p[i] = i;
-
- g1[i] = (F32)((rand() % (B + B)) - B) / B;
-
- for (j = 0 ; j < 2 ; j++)
- g2[i][j] = (F32)((rand() % (B + B)) - B) / B;
- normalize2(g2[i]);
-
- for (j = 0 ; j < 3 ; j++)
- g3[i][j] = (F32)((rand() % (B + B)) - B) / B;
- normalize3(g3[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];
- }
-
- sInitialized = true;
+ int i, j, k;
+
+ for (i = 0 ; i < B ; i++)
+ {
+ p[i] = i;
+
+ g1[i] = (F32)((rand() % (B + B)) - B) / B;
+
+ for (j = 0 ; j < 2 ; j++)
+ g2[i][j] = (F32)((rand() % (B + B)) - B) / B;
+ normalize2(g2[i]);
+
+ for (j = 0 ; j < 3 ; j++)
+ g3[i][j] = (F32)((rand() % (B + B)) - B) / B;
+ normalize3(g3[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];
+ }
+
+ sInitialized = true;
}
@@ -119,176 +119,176 @@ void LLPerlinNoise::init(void)
F32 LLPerlinNoise::noise1(F32 x)
{
- int bx0, bx1;
- F32 rx0, rx1, sx, t, u, v;
+ int bx0, bx1;
+ F32 rx0, rx1, sx, t, u, v;
- if (!sInitialized)
- init();
+ if (!sInitialized)
+ init();
- t = x + N;
- bx0 = (lltrunc(t)) & BM;
- bx1 = (bx0+1) & BM;
- rx0 = t - lltrunc(t);
- rx1 = rx0 - 1.f;
+ t = x + N;
+ bx0 = (lltrunc(t)) & BM;
+ bx1 = (bx0+1) & BM;
+ rx0 = t - lltrunc(t);
+ rx1 = rx0 - 1.f;
- sx = s_curve(rx0);
+ sx = s_curve(rx0);
- u = rx0 * g1[ p[ bx0 ] ];
- v = rx1 * g1[ p[ bx1 ] ];
+ u = rx0 * g1[ p[ bx0 ] ];
+ v = rx1 * g1[ p[ bx1 ] ];
- return lerp_m(sx, u, v);
+ return lerp_m(sx, u, v);
}
static F32 fast_at2(F32 rx, F32 ry, F32 *q)
{
- return rx * q[0] + ry * q[1];
+ return rx * q[0] + ry * q[1];
}
F32 LLPerlinNoise::noise2(F32 x, F32 y)
{
- U8 bx0, bx1, by0, by1;
- U32 b00, b10, b01, b11;
- F32 rx0, rx1, ry0, ry1, *q, sx, sy, a, b, u, v;
- S32 i, j;
+ U8 bx0, bx1, by0, by1;
+ U32 b00, b10, b01, b11;
+ F32 rx0, rx1, ry0, ry1, *q, sx, sy, a, b, u, v;
+ S32 i, j;
- if (!sInitialized)
- init();
+ if (!sInitialized)
+ init();
- fast_setup(x, bx0, bx1, rx0, rx1);
- fast_setup(y, by0, by1, ry0, ry1);
+ fast_setup(x, bx0, bx1, rx0, rx1);
+ fast_setup(y, by0, by1, ry0, ry1);
- i = *(p + bx0);
- j = *(p + bx1);
+ i = *(p + bx0);
+ j = *(p + bx1);
- b00 = *(p + i + by0);
- b10 = *(p + j + by0);
- b01 = *(p + i + by1);
- b11 = *(p + j + by1);
+ b00 = *(p + i + by0);
+ b10 = *(p + j + by0);
+ b01 = *(p + i + by1);
+ b11 = *(p + j + by1);
- sx = s_curve(rx0);
- sy = s_curve(ry0);
+ sx = s_curve(rx0);
+ sy = s_curve(ry0);
- q = *(g2 + b00);
- u = fast_at2(rx0, ry0, q);
- q = *(g2 + b10);
- v = fast_at2(rx1, ry0, q);
- a = lerp_m(sx, u, v);
+ q = *(g2 + b00);
+ u = fast_at2(rx0, ry0, q);
+ q = *(g2 + b10);
+ v = fast_at2(rx1, ry0, q);
+ a = lerp_m(sx, u, v);
- q = *(g2 + b01);
- u = fast_at2(rx0,ry1,q);
- q = *(g2 + b11);
- v = fast_at2(rx1,ry1,q);
- b = lerp_m(sx, u, v);
+ q = *(g2 + b01);
+ u = fast_at2(rx0,ry1,q);
+ q = *(g2 + b11);
+ v = fast_at2(rx1,ry1,q);
+ b = lerp_m(sx, u, v);
- return lerp_m(sy, a, b);
+ return lerp_m(sy, a, b);
}
static F32 fast_at3(F32 rx, F32 ry, F32 rz, F32 *q)
{
- return rx * q[0] + ry * q[1] + rz * q[2];
+ return rx * q[0] + ry * q[1] + rz * q[2];
}
F32 LLPerlinNoise::noise3(F32 x, F32 y, F32 z)
{
- U8 bx0, bx1, by0, by1, bz0, bz1;
- S32 b00, b10, b01, b11;
- F32 rx0, rx1, ry0, ry1, rz0, rz1, *q, sy, sz, a, b, c, d, t, u, v;
- S32 i, j;
-
- if (!sInitialized)
- init();
-
- fast_setup(x, bx0,bx1, rx0,rx1);
- fast_setup(y, by0,by1, ry0,ry1);
- fast_setup(z, 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);
-
- q = g3[ b00 + bz0 ];
- u = fast_at3(rx0,ry0,rz0,q);
- q = g3[ b10 + bz0 ];
- v = fast_at3(rx1,ry0,rz0,q);
- a = lerp_m(t, u, v);
-
- q = g3[ b01 + bz0 ];
- u = fast_at3(rx0,ry1,rz0,q);
- q = g3[ b11 + bz0 ];
- v = fast_at3(rx1,ry1,rz0,q);
- b = lerp_m(t, u, v);
-
- c = lerp_m(sy, a, b);
-
- q = g3[ b00 + bz1 ];
- u = fast_at3(rx0,ry0,rz1,q);
- q = g3[ b10 + bz1 ];
- v = fast_at3(rx1,ry0,rz1,q);
- a = lerp_m(t, u, v);
-
- q = g3[ b01 + bz1 ];
- u = fast_at3(rx0,ry1,rz1,q);
- q = g3[ b11 + bz1 ];
- v = fast_at3(rx1,ry1,rz1,q);
- b = lerp_m(t, u, v);
-
- d = lerp_m(sy, a, b);
-
- return lerp_m(sz, c, d);
+ U8 bx0, bx1, by0, by1, bz0, bz1;
+ S32 b00, b10, b01, b11;
+ F32 rx0, rx1, ry0, ry1, rz0, rz1, *q, sy, sz, a, b, c, d, t, u, v;
+ S32 i, j;
+
+ if (!sInitialized)
+ init();
+
+ fast_setup(x, bx0,bx1, rx0,rx1);
+ fast_setup(y, by0,by1, ry0,ry1);
+ fast_setup(z, 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);
+
+ q = g3[ b00 + bz0 ];
+ u = fast_at3(rx0,ry0,rz0,q);
+ q = g3[ b10 + bz0 ];
+ v = fast_at3(rx1,ry0,rz0,q);
+ a = lerp_m(t, u, v);
+
+ q = g3[ b01 + bz0 ];
+ u = fast_at3(rx0,ry1,rz0,q);
+ q = g3[ b11 + bz0 ];
+ v = fast_at3(rx1,ry1,rz0,q);
+ b = lerp_m(t, u, v);
+
+ c = lerp_m(sy, a, b);
+
+ q = g3[ b00 + bz1 ];
+ u = fast_at3(rx0,ry0,rz1,q);
+ q = g3[ b10 + bz1 ];
+ v = fast_at3(rx1,ry0,rz1,q);
+ a = lerp_m(t, u, v);
+
+ q = g3[ b01 + bz1 ];
+ u = fast_at3(rx0,ry1,rz1,q);
+ q = g3[ b11 + bz1 ];
+ v = fast_at3(rx1,ry1,rz1,q);
+ b = lerp_m(t, u, v);
+
+ d = lerp_m(sy, a, b);
+
+ return lerp_m(sz, c, d);
}
F32 LLPerlinNoise::turbulence2(F32 x, F32 y, F32 freq)
{
- F32 t, lx, ly;
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
- {
- lx = freq * x;
- ly = freq * y;
- t += noise2(lx, ly)/freq;
- }
- return t;
+ F32 t, lx, ly;
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
+ {
+ lx = freq * x;
+ ly = freq * y;
+ t += noise2(lx, ly)/freq;
+ }
+ return t;
}
F32 LLPerlinNoise::turbulence3(F32 x, F32 y, F32 z, F32 freq)
{
- F32 t, lx, ly, lz;
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
- {
- lx = freq * x;
- ly = freq * y;
- lz = freq * z;
- t += noise3(lx,ly,lz)/freq;
-// t += fabs(noise3(lx,ly,lz)) / freq; // Like snow - bubbly at low frequencies
-// t += sqrt(fabs(noise3(lx,ly,lz))) / freq; // Better at low freq
-// t += (noise3(lx,ly,lz)*noise3(lx,ly,lz)) / freq;
- }
- return t;
+ F32 t, lx, ly, lz;
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
+ {
+ lx = freq * x;
+ ly = freq * y;
+ lz = freq * z;
+ t += noise3(lx,ly,lz)/freq;
+// t += fabs(noise3(lx,ly,lz)) / freq; // Like snow - bubbly at low frequencies
+// t += sqrt(fabs(noise3(lx,ly,lz))) / freq; // Better at low freq
+// t += (noise3(lx,ly,lz)*noise3(lx,ly,lz)) / freq;
+ }
+ return t;
}
F32 LLPerlinNoise::clouds3(F32 x, F32 y, F32 z, F32 freq)
{
- F32 t, lx, ly, lz;
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
- {
- lx = freq * x;
- ly = freq * y;
- lz = freq * z;
-// t += noise3(lx,ly,lz)/freq;
-// t += fabs(noise3(lx,ly,lz)) / freq; // Like snow - bubbly at low frequencies
-// t += sqrt(fabs(noise3(lx,ly,lz))) / freq; // Better at low freq
- t += (noise3(lx,ly,lz)*noise3(lx,ly,lz)) / freq;
- }
- return t;
+ F32 t, lx, ly, lz;
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f)
+ {
+ lx = freq * x;
+ ly = freq * y;
+ lz = freq * z;
+// t += noise3(lx,ly,lz)/freq;
+// t += fabs(noise3(lx,ly,lz)) / freq; // Like snow - bubbly at low frequencies
+// t += sqrt(fabs(noise3(lx,ly,lz))) / freq; // Better at low freq
+ t += (noise3(lx,ly,lz)*noise3(lx,ly,lz)) / freq;
+ }
+ return t;
}
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