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-rw-r--r--indra/newview/noise.h416
1 files changed, 208 insertions, 208 deletions
diff --git a/indra/newview/noise.h b/indra/newview/noise.h
index b3efad73c5..ae819cf542 100644
--- a/indra/newview/noise.h
+++ b/indra/newview/noise.h
@@ -1,25 +1,25 @@
-/**
+/**
* @file noise.h
* @brief Perlin noise routines for procedural textures, etc
*
* $LicenseInfo:firstyear=2000&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
@@ -37,65 +37,65 @@ F32 noise3(float *vec);
inline F32 bias(F32 a, F32 b)
{
- return (F32)pow(a, (F32)(log(b) / log(0.5f)));
+ return (F32)pow(a, (F32)(log(b) / log(0.5f)));
}
inline F32 gain(F32 a, F32 b)
{
- F32 p = (F32) (log(1.f - b) / log(0.5f));
-
- if (a < .001f)
- return 0.f;
- else if (a > .999f)
- return 1.f;
- if (a < 0.5f)
- return (F32)(pow(2 * a, p) / 2.f);
- else
- return (F32)(1.f - pow(2 * (1.f - a), p) / 2.f);
+ F32 p = (F32) (log(1.f - b) / log(0.5f));
+
+ if (a < .001f)
+ return 0.f;
+ else if (a > .999f)
+ return 1.f;
+ if (a < 0.5f)
+ return (F32)(pow(2 * a, p) / 2.f);
+ else
+ return (F32)(1.f - pow(2 * (1.f - a), p) / 2.f);
}
inline F32 turbulence2(F32 *v, F32 freq)
{
- F32 t, vec[2];
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
- vec[0] = freq * v[0];
- vec[1] = freq * v[1];
- t += noise2(vec)/freq;
- }
- return t;
+ F32 t, vec[2];
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
+ vec[0] = freq * v[0];
+ vec[1] = freq * v[1];
+ t += noise2(vec)/freq;
+ }
+ return t;
}
inline F32 turbulence3(F32 *v, F32 freq)
{
- F32 t, vec[3];
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
- vec[0] = freq * v[0];
- vec[1] = freq * v[1];
- vec[2] = freq * v[2];
- t += noise3(vec)/freq;
-// t += fabs(noise3(vec)) / freq; // Like snow - bubbly at low frequencies
-// t += sqrt(fabs(noise3(vec))) / freq; // Better at low freq
-// t += (noise3(vec)*noise3(vec)) / freq;
- }
- return t;
+ F32 t, vec[3];
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
+ vec[0] = freq * v[0];
+ vec[1] = freq * v[1];
+ vec[2] = freq * v[2];
+ t += noise3(vec)/freq;
+// t += fabs(noise3(vec)) / freq; // Like snow - bubbly at low frequencies
+// t += sqrt(fabs(noise3(vec))) / freq; // Better at low freq
+// t += (noise3(vec)*noise3(vec)) / freq;
+ }
+ return t;
}
inline F32 clouds3(F32 *v, F32 freq)
{
- F32 t, vec[3];
-
- for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
- vec[0] = freq * v[0];
- vec[1] = freq * v[1];
- vec[2] = freq * v[2];
- //t += noise3(vec)/freq;
-// t += fabs(noise3(vec)) / freq; // Like snow - bubbly at low frequencies
-// t += sqrt(fabs(noise3(vec))) / freq; // Better at low freq
- t += (noise3(vec)*noise3(vec)) / freq;
- }
- return t;
+ F32 t, vec[3];
+
+ for (t = 0.f ; freq >= 1.f ; freq *= 0.5f) {
+ vec[0] = freq * v[0];
+ vec[1] = freq * v[1];
+ vec[2] = freq * v[2];
+ //t += noise3(vec)/freq;
+// t += fabs(noise3(vec)) / freq; // Like snow - bubbly at low frequencies
+// t += sqrt(fabs(noise3(vec))) / freq; // Better at low freq
+ t += (noise3(vec)*noise3(vec)) / freq;
+ }
+ return t;
}
/* noise functions over 1, 2, and 3 dimensions */
@@ -121,230 +121,230 @@ static void init(void);
#define lerp_m(t, a, b) ( a + t * (b - a) )
#define setup_noise(i,b0,b1,r0,r1)\
- t = vec[i] + N;\
- b0 = (lltrunc(t)) & BM;\
- b1 = (b0+1) & BM;\
- r0 = t - lltrunc(t);\
- r1 = r0 - 1.f;
+ t = vec[i] + N;\
+ b0 = (lltrunc(t)) & BM;\
+ b1 = (b0+1) & BM;\
+ r0 = t - lltrunc(t);\
+ r1 = r0 - 1.f;
inline 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;
}
inline F32 noise1(const F32 arg)
{
- int bx0, bx1;
- F32 rx0, rx1, sx, t, u, v, vec[1];
+ int bx0, bx1;
+ F32 rx0, rx1, sx, t, u, v, vec[1];
- vec[0] = arg;
- if (gNoiseStart) {
- gNoiseStart = 0;
- init();
- }
+ vec[0] = arg;
+ if (gNoiseStart) {
+ gNoiseStart = 0;
+ init();
+ }
- setup_noise(0, bx0,bx1, rx0,rx1);
+ setup_noise(0, bx0,bx1, rx0,rx1);
- 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);
}
inline F32 fast_at2(F32 rx, F32 ry, F32 *q)
{
- return rx * (*q) + ry * (*(q + 1));
+ return rx * (*q) + ry * (*(q + 1));
}
inline F32 fast_at3(F32 rx, F32 ry, F32 rz, F32 *q)
{
- return rx * (*q) + ry * (*(q + 1)) + rz * (*(q + 2));
+ return rx * (*q) + ry * (*(q + 1)) + rz * (*(q + 2));
}
inline F32 noise3(F32 *vec)
{
- 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 (gNoiseStart) {
- gNoiseStart = 0;
- init();
- }
-
- fast_setup(*vec, bx0,bx1, rx0,rx1);
- fast_setup(*(vec + 1), by0,by1, ry0,ry1);
- fast_setup(*(vec + 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);
-
- 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 (gNoiseStart) {
+ gNoiseStart = 0;
+ init();
+ }
+
+ fast_setup(*vec, bx0,bx1, rx0,rx1);
+ fast_setup(*(vec + 1), by0,by1, ry0,ry1);
+ fast_setup(*(vec + 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);
+
+ 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 noise3(F32 *vec)
{
- int bx0, bx1, by0, by1, bz0, bz1, b00, b10, b01, b11;
- F32 rx0, rx1, ry0, ry1, rz0, rz1, *q, sy, sz, a, b, c, d, t, u, v;
- S32 i, j;
+ int bx0, bx1, by0, by1, bz0, bz1, 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 (gNoiseStart) {
- gNoiseStart = 0;
- init();
- }
+ if (gNoiseStart) {
+ gNoiseStart = 0;
+ init();
+ }
- setup_noise(0, bx0,bx1, rx0,rx1);
- setup_noise(1, by0,by1, ry0,ry1);
- setup_noise(2, bz0,bz1, rz0,rz1);
+ setup_noise(0, bx0,bx1, rx0,rx1);
+ setup_noise(1, by0,by1, ry0,ry1);
+ setup_noise(2, bz0,bz1, rz0,rz1);
- 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 ];
- t = s_curve(rx0);
- sy = s_curve(ry0);
- sz = s_curve(rz0);
+ 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_m(t, u, v);
+ q = g3[ b00 + bz0 ] ; u = at3(rx0,ry0,rz0);
+ q = g3[ b10 + bz0 ] ; v = at3(rx1,ry0,rz0);
+ a = lerp_m(t, u, v);
- q = g3[ b01 + bz0 ] ; u = at3(rx0,ry1,rz0);
- q = g3[ b11 + bz0 ] ; v = at3(rx1,ry1,rz0);
- b = lerp_m(t, u, v);
+ q = g3[ b01 + bz0 ] ; u = at3(rx0,ry1,rz0);
+ q = g3[ b11 + bz0 ] ; v = at3(rx1,ry1,rz0);
+ b = lerp_m(t, u, v);
- c = lerp_m(sy, a, b);
+ c = lerp_m(sy, a, b);
- q = g3[ b00 + bz1 ] ; u = at3(rx0,ry0,rz1);
- q = g3[ b10 + bz1 ] ; v = at3(rx1,ry0,rz1);
- a = lerp_m(t, u, v);
+ q = g3[ b00 + bz1 ] ; u = at3(rx0,ry0,rz1);
+ q = g3[ b10 + bz1 ] ; v = at3(rx1,ry0,rz1);
+ a = lerp_m(t, u, v);
- q = g3[ b01 + bz1 ] ; u = at3(rx0,ry1,rz1);
- q = g3[ b11 + bz1 ] ; v = at3(rx1,ry1,rz1);
- b = lerp_m(t, u, v);
+ q = g3[ b01 + bz1 ] ; u = at3(rx0,ry1,rz1);
+ q = g3[ b11 + bz1 ] ; v = at3(rx1,ry1,rz1);
+ b = lerp_m(t, u, v);
- d = lerp_m(sy, a, b);
+ d = lerp_m(sy, a, b);
- return lerp_m(sz, c, d);
+ return lerp_m(sz, c, d);
}
*/
static void normalize2(F32 v[2])
{
- F32 s;
+ F32 s;
- s = 1.f/(F32)sqrt(v[0] * v[0] + v[1] * v[1]);
- v[0] = v[0] * s;
- v[1] = v[1] * s;
+ 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;
+ F32 s;
- 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;
+ 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 init(void)
{
- // we want repeatable noise (e.g. for stable terrain texturing), so seed with known value
- srand(42);
- 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];
- }
-
- // reintroduce entropy
- srand(time(NULL)); // Flawfinder: ignore
+ // we want repeatable noise (e.g. for stable terrain texturing), so seed with known value
+ srand(42);
+ 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];
+ }
+
+ // reintroduce entropy
+ srand(time(NULL)); // Flawfinder: ignore
}
#undef B
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