diff -r 9569e9f35374 -r 062b1c4143f7 src/noise.cc --- a/src/noise.cc Wed Apr 23 10:38:33 2008 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,108 +0,0 @@ -/* - * noise.cc: noise generators - * - * This file is part of Pyrit Ray Tracer. - * - * Copyright 2006, 2008 Radek Brich - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -#include - -#include "noise.h" - -/* -Perlin noise -Based on JAVA REFERENCE IMPLEMENTATION OF IMPROVED NOISE by KEN PERLIN (COPYRIGHT 2002) -*/ - -Float fade(Float t) -{ - return t * t * t * (t * (t * 6 - 15) + 10); -} - -Float lerp(Float t, Float a, Float b) -{ - return a + t * (b - a); -} - -Float grad(unsigned char hash, Float x, Float y, Float z) -{ - unsigned char h = hash & 15; // CONVERT LO 4 BITS OF HASH CODE - Float u = h<8 ? x : y, // INTO 12 GRADIENT DIRECTIONS. - v = h<4 ? y : h==12||h==14 ? x : z; - return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v); -} - -const unsigned char p[512] = -{ - 151,160,137,91,90,15, - 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23, - 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33, - 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166, - 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244, - 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196, - 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123, - 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42, - 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9, - 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228, - 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107, - 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254, - 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180, - - 151,160,137,91,90,15, - 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23, - 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33, - 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166, - 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244, - 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196, - 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123, - 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42, - 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9, - 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228, - 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107, - 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254, - 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180 -}; - - -Float perlin(Float x, Float y, Float z) -{ - int X = (int)floor(x) & 255, - Y = (int)floor(y) & 255, - Z = (int)floor(z) & 255; - x -= floor(x); - y -= floor(y); - z -= floor(z); - Float u = fade(x), - v = fade(y), - w = fade(z); - int A = p[X ]+Y, AA = p[A]+Z, AB = p[A+1]+Z, - B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z; - - return lerp(w, lerp(v, lerp(u, grad(p[AA ], x , y , z ), - grad(p[BA ], x-1, y , z )), - lerp(u, grad(p[AB ], x , y-1, z ), - grad(p[BB ], x-1, y-1, z ))), - lerp(v, lerp(u, grad(p[AA+1], x , y , z-1 ), - grad(p[BA+1], x-1, y , z-1 )), - lerp(u, grad(p[AB+1], x , y-1, z-1 ), - grad(p[BB+1], x-1, y-1, z-1 )))); -}