/*==LICENSE==* CyanWorlds.com Engine - MMOG client, server and tools Copyright (C) 2011 Cyan Worlds, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . You can contact Cyan Worlds, Inc. by email legal@cyan.com or by snail mail at: Cyan Worlds, Inc. 14617 N Newport Hwy Mead, WA 99021 *==LICENSE==*/ #include "hsTypes.h" #include "hsScalar.h" #include "hsGeometry3.h" #include "hsFastMath.h" const hsScalar hsFastMath::kSqrtTwo = hsSquareRoot(2.f); const hsScalar hsFastMath::kInvSqrtTwo = hsScalarInvert(hsFastMath::kSqrtTwo); const hsScalar hsFastMath::kTwoPI = hsScalarPI * 2.f; hsPoint2 statCosSinTable[9] = // must match length in inline { { 1.f, 0.f }, { hsFastMath::kInvSqrtTwo, hsFastMath::kInvSqrtTwo }, { 0.f, 1.f }, { -hsFastMath::kInvSqrtTwo, hsFastMath::kInvSqrtTwo }, { -1.f, 0.f }, { -hsFastMath::kInvSqrtTwo, -hsFastMath::kInvSqrtTwo }, { 0.f, -1.f }, { hsFastMath::kInvSqrtTwo, -hsFastMath::kInvSqrtTwo }, { 1.f, 0.f } }; const hsPoint2* hsFastMath::fCosSinTable = statCosSinTable; unsigned char statSeedTable[] = { 0x69, 0x69, 0x68, 0x67, 0x67, 0x66, 0x65, 0x65, 0x64, 0x63, 0x63, 0x62, 0x61, 0x61, 0x60, 0x5f, 0x5f, 0x5e, 0x5d, 0x5d, 0x5c, 0x5b, 0x5b, 0x5a, 0x5a, 0x59, 0x58, 0x58, 0x57, 0x57, 0x56, 0x55, 0x55, 0x54, 0x54, 0x53, 0x52, 0x52, 0x51, 0x51, 0x50, 0x50, 0x4f, 0x4e, 0x4e, 0x4d, 0x4d, 0x4c, 0x4c, 0x4b, 0x4b, 0x4a, 0x4a, 0x49, 0x48, 0x48, 0x47, 0x47, 0x46, 0x46, 0x45, 0x45, 0x44, 0x44, 0x43, 0x43, 0x42, 0x42, 0x41, 0x41, 0x40, 0x40, 0x3f, 0x3f, 0x3e, 0x3e, 0x3d, 0x3d, 0x3c, 0x3c, 0x3c, 0x3b, 0x3b, 0x3a, 0x3a, 0x39, 0x39, 0x38, 0x38, 0x37, 0x37, 0x36, 0x36, 0x36, 0x35, 0x35, 0x34, 0x34, 0x33, 0x33, 0x33, 0x32, 0x32, 0x31, 0x31, 0x30, 0x30, 0x30, 0x2f, 0x2f, 0x2e, 0x2e, 0x2e, 0x2d, 0x2d, 0x2c, 0x2c, 0x2b, 0x2b, 0x2b, 0x2a, 0x2a, 0x29, 0x29, 0x29, 0x28, 0x28, 0x28, 0x27, 0x27, 0x26, 0x26, 0x26, 0x25, 0x25, 0x25, 0x24, 0x24, 0x23, 0x23, 0x23, 0x22, 0x22, 0x22, 0x21, 0x21, 0x20, 0x20, 0x20, 0x1f, 0x1f, 0x1f, 0x1e, 0x1e, 0x1e, 0x1d, 0x1d, 0x1d, 0x1c, 0x1c, 0x1c, 0x1b, 0x1b, 0x1b, 0x1a, 0x1a, 0x1a, 0x19, 0x19, 0x19, 0x18, 0x18, 0x18, 0x17, 0x17, 0x17, 0x16, 0x16, 0x16, 0x15, 0x15, 0x15, 0x14, 0x14, 0x14, 0x13, 0x13, 0x13, 0x13, 0x12, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10, 0x10, 0x10, 0xf, 0xf, 0xf, 0xf, 0xe, 0xe, 0xe, 0xd, 0xd, 0xd, 0xd, 0xc, 0xc, 0xc, 0xb, 0xb, 0xb, 0xb, 0xa, 0xa, 0xa, 0x9, 0x9, 0x9, 0x9, 0x8, 0x8, 0x8, 0x7, 0x7, 0x7, 0x7, 0x6, 0x6, 0x6, 0x6, 0x5, 0x5, 0x5, 0x5, 0x4, 0x4, 0x4, 0x3, 0x3, 0x3, 0x3, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x0, 0x0, 0x0, 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7, 0xf7, 0xf6, 0xf5, 0xf4, 0xf3, 0xf2, 0xf1, 0xf0, 0xef, 0xee, 0xed, 0xec, 0xec, 0xeb, 0xea, 0xe9, 0xe8, 0xe7, 0xe6, 0xe5, 0xe5, 0xe4, 0xe3, 0xe2, 0xe1, 0xe0, 0xe0, 0xdf, 0xde, 0xdd, 0xdc, 0xdb, 0xdb, 0xda, 0xd9, 0xd8, 0xd8, 0xd7, 0xd6, 0xd5, 0xd4, 0xd4, 0xd3, 0xd2, 0xd1, 0xd1, 0xd0, 0xcf, 0xce, 0xce, 0xcd, 0xcc, 0xcb, 0xcb, 0xca, 0xc9, 0xc9, 0xc8, 0xc7, 0xc7, 0xc6, 0xc5, 0xc4, 0xc4, 0xc3, 0xc2, 0xc2, 0xc1, 0xc0, 0xc0, 0xbf, 0xbe, 0xbe, 0xbd, 0xbc, 0xbc, 0xbb, 0xba, 0xba, 0xb9, 0xb8, 0xb8, 0xb7, 0xb7, 0xb6, 0xb5, 0xb5, 0xb4, 0xb3, 0xb3, 0xb2, 0xb2, 0xb1, 0xb0, 0xb0, 0xaf, 0xaf, 0xae, 0xad, 0xad, 0xac, 0xac, 0xab, 0xaa, 0xaa, 0xa9, 0xa9, 0xa8, 0xa8, 0xa7, 0xa7, 0xa6, 0xa5, 0xa5, 0xa4, 0xa4, 0xa3, 0xa3, 0xa2, 0xa2, 0xa1, 0xa0, 0xa0, 0x9f, 0x9f, 0x9e, 0x9e, 0x9d, 0x9d, 0x9c, 0x9c, 0x9b, 0x9b, 0x9a, 0x9a, 0x99, 0x99, 0x98, 0x98, 0x97, 0x97, 0x96, 0x96, 0x95, 0x95, 0x94, 0x94, 0x93, 0x93, 0x92, 0x92, 0x91, 0x91, 0x90, 0x90, 0x8f, 0x8f, 0x8e, 0x8e, 0x8d, 0x8d, 0x8c, 0x8c, 0x8b, 0x8b, 0x8b, 0x8a, 0x8a, 0x89, 0x89, 0x88, 0x88, 0x87, 0x87, 0x87, 0x86, 0x86, 0x85, 0x85, 0x84, 0x84, 0x83, 0x83, 0x83, 0x82, 0x82, 0x81, 0x81, 0x80, 0x80, 0x80, 0x7f, 0x7f, 0x7e, 0x7e, 0x7d, 0x7d, 0x7d, 0x7c, 0x7c, 0x7b, 0x7b, 0x7b, 0x7a, 0x7a, 0x79, 0x79, 0x79, 0x78, 0x78, 0x77, 0x77, 0x77, 0x76, 0x76, 0x75, 0x75, 0x75, 0x74, 0x74, 0x74, 0x73, 0x73, 0x72, 0x72, 0x72, 0x71, 0x71, 0x71, 0x70, 0x70, 0x6f, 0x6f, 0x6f, 0x6e, 0x6e, 0x6e, 0x6d, 0x6d, 0x6c, 0x6c, 0x6c, 0x6b, 0x6b, 0x6b, 0x6a, 0x6a }; hsScalar hsFastMath::IATan2OverTwoPi(hsScalar y, hsScalar x) { const int tabSize = 16; // pad with one extra because hi can go hi const int tabMax = tabSize-1; static hsScalar tab[tabSize+1] = { 0.f, 0.0105947f, 0.0210962f, 0.0314165f, 0.0414762f, 0.0512082f, 0.0605595f, 0.0694914f, 0.0779791f, 0.0860104f, 0.0935835f, 0.100705f, 0.107388f, 0.113651f, 0.119514f, 0.125f, 0 }; if( (x == 0)&&(y == 0) ) return 0; hsBool xNeg, yNeg; if( yNeg = (y < 0) )y = -y; if( xNeg = (x < 0) )x = -x; hsBool yBigger = y >= x; hsScalar div = yBigger ? x / y : y / x; hsScalar fInd = div * tabMax; int lo = int(fInd); int hi = lo+1; hsScalar frac = fInd - lo; hsScalar res = tab[lo]; res += frac * (tab[hi] - res); // now move to proper half quadrant hsAssert((res >= 0)&&(res <= 0.25f), "Lookup atan2 out of bounds"); if( yBigger ) res = 0.25f - res; switch( (yNeg << 1)|xNeg ) { case 0: break; case 1: res = 0.5f - res; break; case 3: res += 0.5f; break; case 2: res = 1.f - res; break; } return res; }