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140 lines
3.3 KiB
140 lines
3.3 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "hsNoiseFunc.h" |
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#include "hsTypes.h" |
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#include "hsScalar.h" |
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#include "hsGeometry3.h" |
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hsNoiseFunc::hsNoiseFunc() |
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{ |
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} |
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hsNoiseFunc::~hsNoiseFunc() |
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{ |
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} |
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void hsNoiseFunc::Seed(UInt32 s) |
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{ |
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srand(s); |
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} |
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hsTableNoise::hsTableNoise() |
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: fTable(nil), fTableLen(0) |
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{ |
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} |
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hsTableNoise::~hsTableNoise() |
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{ |
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delete [] fTable; |
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} |
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void hsTableNoise::SetTable(int len, hsScalar* arr) |
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{ |
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fTableLen = len; |
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delete [] fTable; |
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if( !len ) |
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{ |
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fTable = nil; |
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return; |
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} |
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fTable = TRACKED_NEW hsScalar[len+2]; |
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int i; |
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for( i = 0; i < len; i++ ) |
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fTable[i] = arr[i]; |
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fTable[i++] = fTable[i-1]; |
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fTable[i++] = fTable[i-1]; |
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} |
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hsScalar hsTableNoise::Noise(hsScalar lo, hsScalar hi, hsScalar t) |
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{ |
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hsAssert(fTableLen, "Badly initialized table noise function"); |
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hsScalar r = hsScalar(rand()) / hsScalar(RAND_MAX); |
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r = lo + (hi - lo) * r; |
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if( t < 0 ) |
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t = 0; |
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else if( t > hsScalar1 ) |
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t = hsScalar1; |
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hsScalar tIdx = t * fTableLen; |
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UInt32 idx = UInt32(tIdx); |
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hsScalar frac = tIdx - hsScalar(idx); |
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hsAssert((idx >= 0)&&(idx <= fTableLen), "Noise parm t out of range [0..1]"); |
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hsScalar scale = fTable[idx] + (fTable[idx+1] - fTable[idx]) * frac; |
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r *= scale; |
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return r; |
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} |
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hsScalar hsTableNoise::NoisePoint(const hsPoint3& p, hsScalar lo, hsScalar hi, hsScalar t) |
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{ |
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hsAssert(fTableLen, "Badly initialized table noise function"); |
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UInt32 sX = *((UInt32*)&p.fX); |
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UInt32 sY = *((UInt32*)&p.fY); |
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UInt32 sZ = *((UInt32*)&p.fZ); |
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UInt32 sAll = ((((sX & 0x07800000) >> 16) | ((sX & 0x007fffff) >> 17)) << 20) |
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| ((((sY & 0x07800000) >> 16) | ((sY & 0x007fffff) >> 17)) << 10) |
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| ((((sZ & 0x07800000) >> 16) | ((sZ & 0x007fffff) >> 17)) ); |
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const UInt32 kExp = 0x3f800000; |
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const UInt32 kMsk = 0x007fffff; |
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const UInt32 kA = 1665636L; |
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const UInt32 kC = 1013904223L; |
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UInt32 iR = kA * sAll + kC; |
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iR &= kMsk; |
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iR |= kExp; |
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hsScalar r = (*(float*)&iR) - 1.f; |
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r = lo + (hi - lo) * r; |
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if( t < 0 ) |
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t = 0; |
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else if( t > hsScalar1 ) |
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t = hsScalar1; |
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hsScalar tIdx = t * fTableLen; |
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UInt32 idx = UInt32(tIdx); |
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hsScalar frac = tIdx - hsScalar(idx); |
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hsAssert((idx >= 0)&&(idx <= fTableLen), "Noise parm t out of range [0..1]"); |
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hsScalar scale = fTable[idx] + (fTable[idx+1] - fTable[idx]) * frac; |
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r *= scale; |
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return r; |
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}
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