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-rw-r--r--libs/rs/rsNoise.cpp256
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diff --git a/libs/rs/rsNoise.cpp b/libs/rs/rsNoise.cpp
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index 764dc1a8cdd1..000000000000
--- a/libs/rs/rsNoise.cpp
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-/*
- * This implementation of the noise functions was ported from the Java
- * implementation by Jerry Huxtable (http://www.jhlabs.com) under
- * Apache License 2.0 (see http://jhlabs.com/ip/filters/download.html)
- *
- * Original header:
- *
- * Copyright 2006 Jerry Huxtable
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "rsNoise.h"
-
-#include <math.h>
-#include <stdlib.h>
-#include <time.h>
-
-namespace android {
-namespace renderscript {
-
-#define B 0x100
-#define BM 0xff
-#define N 0x1000
-
-static int p[B + B + 2];
-static float g3[B + B + 2][3];
-static float g2[B + B + 2][2];
-static float g1[B + B + 2];
-static bool noise_start = true;
-
-#define lerpf(start, stop, amount) start + (stop - start) * amount
-
-static inline float noise_sCurve(float t)
-{
- return t * t * (3.0f - 2.0f * t);
-}
-
-inline void SC_normalizef2(float v[])
-{
- float s = (float)sqrtf(v[0] * v[0] + v[1] * v[1]);
- v[0] = v[0] / s;
- v[1] = v[1] / s;
-}
-
-inline void SC_normalizef3(float v[])
-{
- float s = (float)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 noise_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;
- SC_normalizef2(g2[i]);
-
- for (j = 0; j < 3; j++)
- g3[i][j] = (float)((rand() % (B + B)) - B) / B;
- SC_normalizef3(g3[i]);
- }
-
- for (i = B-1; i >= 0; 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];
- }
-}
-
-float SC_noisef(float x)
-{
- srand(time(NULL));
- int bx0, bx1;
- float rx0, rx1, sx, t, u, v;
-
- if (noise_start) {
- noise_start = false;
- noise_init();
- }
-
- t = x + N;
- bx0 = ((int)t) & BM;
- bx1 = (bx0+1) & BM;
- rx0 = t - (int)t;
- rx1 = rx0 - 1.0f;
-
- sx = noise_sCurve(rx0);
-
- u = rx0 * g1[p[bx0]];
- v = rx1 * g1[p[bx1]];
- return 2.3f * lerpf(u, v, sx);
-}
-
-float SC_noisef2(float x, float y)
-{
- srand(time(NULL));
- int bx0, bx1, by0, by1, b00, b10, b01, b11;
- float rx0, rx1, ry0, ry1, sx, sy, a, b, t, u, v;
- float *q;
- int i, j;
-
- if (noise_start) {
- noise_start = false;
- noise_init();
- }
-
- t = x + N;
- bx0 = ((int)t) & BM;
- bx1 = (bx0+1) & BM;
- rx0 = t - (int)t;
- rx1 = rx0 - 1.0f;
-
- t = y + N;
- by0 = ((int)t) & BM;
- by1 = (by0+1) & BM;
- ry0 = t - (int)t;
- ry1 = ry0 - 1.0f;
-
- i = p[bx0];
- j = p[bx1];
-
- b00 = p[i + by0];
- b10 = p[j + by0];
- b01 = p[i + by1];
- b11 = p[j + by1];
-
- sx = noise_sCurve(rx0);
- sy = noise_sCurve(ry0);
-
- q = g2[b00]; u = rx0 * q[0] + ry0 * q[1];
- q = g2[b10]; v = rx1 * q[0] + ry0 * q[1];
- a = lerpf(u, v, sx);
-
- q = g2[b01]; u = rx0 * q[0] + ry1 * q[1];
- q = g2[b11]; v = rx1 * q[0] + ry1 * q[1];
- b = lerpf(u, v, sx);
-
- return 1.5f*lerpf(a, b, sy);
-}
-
-float SC_noisef3(float x, float y, float z)
-{
- srand(time(NULL));
- int bx0, bx1, by0, by1, bz0, bz1, b00, b10, b01, b11;
- float rx0, rx1, ry0, ry1, rz0, rz1, sy, sz, a, b, c, d, t, u, v;
- float *q;
- int i, j;
-
- if (noise_start) {
- noise_start = false;
- noise_init();
- }
-
- t = x + N;
- bx0 = ((int)t) & BM;
- bx1 = (bx0+1) & BM;
- rx0 = t - (int)t;
- rx1 = rx0 - 1.0f;
-
- t = y + N;
- by0 = ((int)t) & BM;
- by1 = (by0+1) & BM;
- ry0 = t - (int)t;
- ry1 = ry0 - 1.0f;
-
- t = z + N;
- bz0 = ((int)t) & BM;
- bz1 = (bz0+1) & BM;
- rz0 = t - (int)t;
- rz1 = rz0 - 1.0f;
-
- i = p[bx0];
- j = p[bx1];
-
- b00 = p[i + by0];
- b10 = p[j + by0];
- b01 = p[i + by1];
- b11 = p[j + by1];
-
- t = noise_sCurve(rx0);
- sy = noise_sCurve(ry0);
- sz = noise_sCurve(rz0);
-
- q = g3[b00 + bz0]; u = rx0 * q[0] + ry0 * q[1] + rz0 * q[2];
- q = g3[b10 + bz0]; v = rx1 * q[0] + ry0 * q[1] + rz0 * q[2];
- a = lerpf(u, v, t);
-
- q = g3[b01 + bz0]; u = rx0 * q[0] + ry1 * q[1] + rz0 * q[2];
- q = g3[b11 + bz0]; v = rx1 * q[0] + ry1 * q[1] + rz0 * q[2];
- b = lerpf(u, v, t);
-
- c = lerpf(a, b, sy);
-
- q = g3[b00 + bz1]; u = rx0 * q[0] + ry0 * q[1] + rz1 * q[2];
- q = g3[b10 + bz1]; v = rx1 * q[0] + ry0 * q[1] + rz1 * q[2];
- a = lerpf(u, v, t);
-
- q = g3[b01 + bz1]; u = rx0 * q[0] + ry1 * q[1] + rz1 * q[2];
- q = g3[b11 + bz1]; v = rx1 * q[0] + ry1 * q[1] + rz1 * q[2];
- b = lerpf(u, v, t);
-
- d = lerpf(a, b, sy);
-
- return 1.5f*lerpf(c, d, sz);
-}
-
-float SC_turbulencef2(float x, float y, float octaves)
-{
- srand(time(NULL));
- float t = 0.0f;
-
- for (float f = 1.0f; f <= octaves; f *= 2)
- t += fabs(SC_noisef2(f * x, f * y)) / f;
- return t;
-}
-
-float SC_turbulencef3(float x, float y, float z, float octaves)
-{
- srand(time(NULL));
- float t = 0.0f;
-
- for (float f = 1.0f; f <= octaves; f *= 2)
- t += fabs(SC_noisef3(f * x, f * y, f * z)) / f;
- return t;
-}
-
-}
-} \ No newline at end of file
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