mirror of
https://github.com/id-Software/DOOM-3-BFG.git
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331 lines
8.5 KiB
C++
331 lines
8.5 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code 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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Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#pragma hdrstop
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#include "precompiled.h"
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#undef min // windef.h macros
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#undef max
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#include "BoundsTrack.h"
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/*
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We want to do one SIMD compare on 8 short components and know that the bounds
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overlap if all 8 tests pass
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*/
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// shortBounds_t is used to track the reference bounds of all entities in a
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// cache-friendly and easy to compare way.
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//
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// To allow all elements to be compared with a single comparison sense, the maxs
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// are stored as negated values.
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//
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// We may need to add a global scale factor to this if there are intersections
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// completely outside +/-32k
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struct shortBounds_t
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{
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shortBounds_t()
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{
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SetToEmpty();
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}
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shortBounds_t( const idBounds& b )
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{
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SetFromReferenceBounds( b );
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}
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short b[2][4]; // fourth element is just for padding
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idBounds ToFloatBounds() const
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{
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idBounds f;
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for( int i = 0 ; i < 3 ; i++ )
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{
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f[0][i] = b[0][i];
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f[1][i] = -b[1][i];
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}
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return f;
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}
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bool IntersectsShortBounds( shortBounds_t& comp ) const
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{
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shortBounds_t test;
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comp.MakeComparisonBounds( test );
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return IntersectsComparisonBounds( test );
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}
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bool IntersectsComparisonBounds( shortBounds_t& test ) const
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{
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// this can be a single ALTIVEC vcmpgtshR instruction
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return test.b[0][0] > b[0][0]
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&& test.b[0][1] > b[0][1]
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&& test.b[0][2] > b[0][2]
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&& test.b[0][3] > b[0][3]
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&& test.b[1][0] > b[1][0]
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&& test.b[1][1] > b[1][1]
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&& test.b[1][2] > b[1][2]
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&& test.b[1][3] > b[1][3];
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}
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void MakeComparisonBounds( shortBounds_t& comp ) const
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{
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comp.b[0][0] = -b[1][0];
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comp.b[1][0] = -b[0][0];
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comp.b[0][1] = -b[1][1];
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comp.b[1][1] = -b[0][1];
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comp.b[0][2] = -b[1][2];
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comp.b[1][2] = -b[0][2];
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comp.b[0][3] = 0x7fff;
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comp.b[1][3] = 0x7fff;
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}
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void SetFromReferenceBounds( const idBounds& set )
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{
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// the maxs are stored negated
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for( int i = 0 ; i < 3 ; i++ )
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{
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int minv = floor( set[0][i] );
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b[0][i] = std::max( -32768, minv );
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int maxv = -ceil( set[1][i] );
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b[1][i] = std::min( 32767, maxv );
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}
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b[0][3] = b[1][3] = 0;
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}
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void SetToEmpty()
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{
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// this will always fail the comparison
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for( int i = 0 ; i < 2 ; i++ )
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{
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for( int j = 0 ; j < 4 ; j++ )
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{
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b[i][j] = 0x7fff;
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}
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}
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}
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};
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// pure function
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int FindBoundsIntersectionsTEST(
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const shortBounds_t testBounds,
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const shortBounds_t* const boundsList,
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const int numBounds,
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int* const returnedList )
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{
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int hits = 0;
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idBounds testF = testBounds.ToFloatBounds();
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for( int i = 0 ; i < numBounds ; i++ )
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{
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idBounds listF = boundsList[i].ToFloatBounds();
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if( testF.IntersectsBounds( listF ) )
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{
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returnedList[hits++] = i;
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}
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}
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return hits;
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}
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// pure function
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int FindBoundsIntersectionsSimSIMD(
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const shortBounds_t testBounds,
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const shortBounds_t* const boundsList,
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const int numBounds,
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int* const returnedList )
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{
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shortBounds_t compareBounds;
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testBounds.MakeComparisonBounds( compareBounds );
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int hits = 0;
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for( int i = 0 ; i < numBounds ; i++ )
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{
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const shortBounds_t& listBounds = boundsList[i];
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bool compare[8];
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int count = 0;
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for( int j = 0 ; j < 8 ; j++ )
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{
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if( ( ( short* )&compareBounds )[j] >= ( ( short* )&listBounds )[j] )
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{
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compare[j] = true;
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count++;
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}
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else
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{
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compare[j] = false;
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}
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}
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if( count == 8 )
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{
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returnedList[hits++] = i;
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}
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}
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return hits;
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}
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idBoundsTrack::idBoundsTrack()
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{
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boundsList = ( shortBounds_t* )Mem_Alloc( MAX_BOUNDS_TRACK_INDEXES * sizeof( *boundsList ), TAG_RENDER );
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ClearAll();
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}
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idBoundsTrack::~idBoundsTrack()
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{
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Mem_Free( boundsList );
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}
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void idBoundsTrack::ClearAll()
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{
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maxIndex = 0;
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for( int i = 0 ; i < MAX_BOUNDS_TRACK_INDEXES ; i++ )
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{
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ClearIndex( i );
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}
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}
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void idBoundsTrack::SetIndex( const int index, const idBounds& bounds )
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{
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assert( ( unsigned )index < MAX_BOUNDS_TRACK_INDEXES );
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maxIndex = std::max( maxIndex, index + 1 );
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boundsList[index].SetFromReferenceBounds( bounds );
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}
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void idBoundsTrack::ClearIndex( const int index )
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{
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assert( ( unsigned )index < MAX_BOUNDS_TRACK_INDEXES );
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boundsList[index].SetToEmpty();
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}
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int idBoundsTrack::FindIntersections( const idBounds& testBounds, int intersectedIndexes[ MAX_BOUNDS_TRACK_INDEXES ] ) const
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{
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const shortBounds_t shortTestBounds( testBounds );
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return FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes );
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}
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void idBoundsTrack::Test()
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{
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ClearAll();
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idRandom r;
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for( int i = 0 ; i < 1800 ; i++ )
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{
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idBounds b;
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for( int j = 0 ; j < 3 ; j++ )
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{
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b[0][j] = r.RandomInt( 20000 ) - 10000;
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b[1][j] = b[0][j] + r.RandomInt( 1000 );
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}
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SetIndex( i, b );
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}
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const idBounds testBounds( idVec3( -1000, 2000, -3000 ), idVec3( 1500, 4500, -500 ) );
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SetIndex( 1800, testBounds );
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SetIndex( 0, testBounds );
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const shortBounds_t shortTestBounds( testBounds );
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int intersectedIndexes1[ MAX_BOUNDS_TRACK_INDEXES ];
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const int numHits1 = FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes1 );
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int intersectedIndexes2[ MAX_BOUNDS_TRACK_INDEXES ];
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const int numHits2 = FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
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idLib::Printf( "%i intersections\n", numHits1 );
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if( numHits1 != numHits2 )
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{
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idLib::Printf( "different results\n" );
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}
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else
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{
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for( int i = 0 ; i < numHits1 ; i++ )
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{
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if( intersectedIndexes1[i] != intersectedIndexes2[i] )
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{
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idLib::Printf( "different results\n" );
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break;
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}
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}
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}
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// run again for debugging failure
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FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes1 );
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FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
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// timing
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const int64 start = Sys_Microseconds();
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for( int i = 0 ; i < 40 ; i++ )
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{
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FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
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}
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const int64 stop = Sys_Microseconds();
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idLib::Printf( "%lli microseconds for 40 itterations\n", stop - start );
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}
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class interactionPair_t
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{
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int entityIndex;
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int lightIndex;
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};
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/*
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keep a sorted list of static interactions and interactions already generated this frame?
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determine if the light needs more exact culling because it is rotated or a spot light
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for each entity on the bounds intersection list
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if entity is not directly visible, determine if it can cast a shadow into the view
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if the light center is in-frustum
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and the entity bounds is out-of-frustum, it can't contribue
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else the light center is off-frustum
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if any of the view frustum planes can be moved out to the light center and the entity bounds is still outside it, it can't contribute
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if a static interaction exists
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continue
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possibly perform more exact refernce bounds to rotated or spot light
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create an interaction pair and add it to the list
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all models will have an interaction with light -1 for ambient surface
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sort the interaction list by model
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do
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if the model is dynamic, create it
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add the ambient surface and skip interaction -1
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for all interactions
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check for static interaction
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check for current-frame interaction
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else create shadow for this light
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*/
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