41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/*
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* Copyright 2008 David Adam
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "windef.h"
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#include "wingdi.h"
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#include "d3dx8.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(d3dx);
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BOOL WINAPI D3DXSphereBoundProbe(CONST D3DXVECTOR3 *pcenter, FLOAT radius, CONST D3DXVECTOR3 *prayposition, CONST D3DXVECTOR3 *praydirection)
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{
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D3DXVECTOR3 difference;
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FLOAT a, b, c, d;
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a = D3DXVec3LengthSq(praydirection);
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if (!D3DXVec3Subtract(&difference, prayposition, pcenter)) return FALSE;
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b = D3DXVec3Dot(&difference, praydirection);
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c = D3DXVec3LengthSq(&difference) - radius * radius;
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d = b * b - a * c;
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if ( ( d <= 0.0f ) || ( sqrt(d) <= b ) ) return FALSE;
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return TRUE;
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}
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