Second Life viewer sources 1.13.2.12

1 files changed, 353 insertions, 0 deletions

diff --git a/linden/indra/newview/noise.h b/linden/indra/newview/noise.h
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+/** 
+ * @file noise.h
+ * @brief Perlin noise routines for procedural textures, etc
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_NOISE_H
+#define LL_NOISE_H
+
+#include "llmath.h"
+
+F32 turbulence2(F32 *v, F32 freq);
+F32 turbulence3(float *v, float freq);
+F32 clouds3(float *v, float freq);
+F32 noise2(float *vec);
+F32 noise3(float *vec);
+
+inline F32 bias(F32 a, F32 b)
+{
+        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);
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+/* noise functions over 1, 2, and 3 dimensions */
+
+#define B 0x100
+#define BM 0xff
+
+#define N 0x1000
+#define NF32 (4096.f)
+#define NP 12   /* 2^N */
+#define NM 0xfff
+
+extern S32 p[B + B + 2];
+extern F32 g3[B + B + 2][3];
+extern F32 g2[B + B + 2][2];
+extern F32 g1[B + B + 2];
+extern S32 gNoiseStart;
+
+static void init(void);
+
+#define s_curve(t) ( t * t * (3.f - 2.f * t) )
+
+#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;
+
+
+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;
+}
+
+inline F32 noise1(const F32 arg)
+{
+        int bx0, bx1;
+        F32 rx0, rx1, sx, t, u, v, vec[1];
+
+        vec[0] = arg;
+        if (gNoiseStart) {
+                gNoiseStart = 0;
+                init();
+        }
+
+        setup_noise(0, bx0,bx1, rx0,rx1);
+
+        sx = s_curve(rx0);
+
+        u = rx0 * g1[ p[ bx0 ] ];
+        v = rx1 * g1[ p[ bx1 ] ];
+
+        return lerp_m(sx, u, v);
+}
+
+inline F32 fast_at2(F32 rx, F32 ry, F32 *q)
+{
+        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));
+}
+
+
+
+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);
+}
+
+
+/*
+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;
+
+        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);
+
+        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_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);
+
+        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);
+
+        d = lerp_m(sy, a, b);
+
+        return lerp_m(sz, c, d);
+}
+*/
+
+static void normalize2(F32 v[2])
+{
+        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;
+}
+
+static void normalize3(F32 v[3])
+{
+        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;
+}
+
+static void 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];
+        }
+}
+
+#undef B
+#undef BM
+#undef N
+#undef NF32
+#undef NP
+#undef NM
+
+#endif // LL_NOISE_