mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-11 05:01:25 +00:00
331 lines
8.5 KiB
C++
331 lines
8.5 KiB
C++
/*
|
|
===========================================================================
|
|
|
|
Doom 3 BFG Edition GPL Source Code
|
|
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
|
|
|
|
This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
|
|
|
|
Doom 3 BFG Edition Source Code 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.
|
|
|
|
Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
===========================================================================
|
|
*/
|
|
|
|
#pragma hdrstop
|
|
#include "precompiled.h"
|
|
|
|
|
|
#undef min // windef.h macros
|
|
#undef max
|
|
|
|
#include "BoundsTrack.h"
|
|
|
|
/*
|
|
|
|
We want to do one SIMD compare on 8 short components and know that the bounds
|
|
overlap if all 8 tests pass
|
|
|
|
*/
|
|
|
|
// shortBounds_t is used to track the reference bounds of all entities in a
|
|
// cache-friendly and easy to compare way.
|
|
//
|
|
// To allow all elements to be compared with a single comparison sense, the maxs
|
|
// are stored as negated values.
|
|
//
|
|
// We may need to add a global scale factor to this if there are intersections
|
|
// completely outside +/-32k
|
|
struct shortBounds_t
|
|
{
|
|
shortBounds_t()
|
|
{
|
|
SetToEmpty();
|
|
}
|
|
|
|
shortBounds_t( const idBounds& b )
|
|
{
|
|
SetFromReferenceBounds( b );
|
|
}
|
|
|
|
short b[2][4]; // fourth element is just for padding
|
|
|
|
idBounds ToFloatBounds() const
|
|
{
|
|
idBounds f;
|
|
for( int i = 0 ; i < 3 ; i++ )
|
|
{
|
|
f[0][i] = b[0][i];
|
|
f[1][i] = -b[1][i];
|
|
}
|
|
return f;
|
|
}
|
|
|
|
bool IntersectsShortBounds( shortBounds_t& comp ) const
|
|
{
|
|
shortBounds_t test;
|
|
comp.MakeComparisonBounds( test );
|
|
return IntersectsComparisonBounds( test );
|
|
}
|
|
|
|
bool IntersectsComparisonBounds( shortBounds_t& test ) const
|
|
{
|
|
// this can be a single ALTIVEC vcmpgtshR instruction
|
|
return test.b[0][0] > b[0][0]
|
|
&& test.b[0][1] > b[0][1]
|
|
&& test.b[0][2] > b[0][2]
|
|
&& test.b[0][3] > b[0][3]
|
|
&& test.b[1][0] > b[1][0]
|
|
&& test.b[1][1] > b[1][1]
|
|
&& test.b[1][2] > b[1][2]
|
|
&& test.b[1][3] > b[1][3];
|
|
}
|
|
|
|
void MakeComparisonBounds( shortBounds_t& comp ) const
|
|
{
|
|
comp.b[0][0] = -b[1][0];
|
|
comp.b[1][0] = -b[0][0];
|
|
comp.b[0][1] = -b[1][1];
|
|
comp.b[1][1] = -b[0][1];
|
|
comp.b[0][2] = -b[1][2];
|
|
comp.b[1][2] = -b[0][2];
|
|
comp.b[0][3] = 0x7fff;
|
|
comp.b[1][3] = 0x7fff;
|
|
}
|
|
|
|
void SetFromReferenceBounds( const idBounds& set )
|
|
{
|
|
// the maxs are stored negated
|
|
for( int i = 0 ; i < 3 ; i++ )
|
|
{
|
|
int minv = floor( set[0][i] );
|
|
b[0][i] = std::max( -32768, minv );
|
|
int maxv = -ceil( set[1][i] );
|
|
b[1][i] = std::min( 32767, maxv );
|
|
}
|
|
b[0][3] = b[1][3] = 0;
|
|
}
|
|
|
|
void SetToEmpty()
|
|
{
|
|
// this will always fail the comparison
|
|
for( int i = 0 ; i < 2 ; i++ )
|
|
{
|
|
for( int j = 0 ; j < 4 ; j++ )
|
|
{
|
|
b[i][j] = 0x7fff;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
|
|
// pure function
|
|
int FindBoundsIntersectionsTEST(
|
|
const shortBounds_t testBounds,
|
|
const shortBounds_t* const boundsList,
|
|
const int numBounds,
|
|
int* const returnedList )
|
|
{
|
|
|
|
int hits = 0;
|
|
idBounds testF = testBounds.ToFloatBounds();
|
|
for( int i = 0 ; i < numBounds ; i++ )
|
|
{
|
|
idBounds listF = boundsList[i].ToFloatBounds();
|
|
if( testF.IntersectsBounds( listF ) )
|
|
{
|
|
returnedList[hits++] = i;
|
|
}
|
|
}
|
|
return hits;
|
|
}
|
|
|
|
// pure function
|
|
int FindBoundsIntersectionsSimSIMD(
|
|
const shortBounds_t testBounds,
|
|
const shortBounds_t* const boundsList,
|
|
const int numBounds,
|
|
int* const returnedList )
|
|
{
|
|
|
|
shortBounds_t compareBounds;
|
|
testBounds.MakeComparisonBounds( compareBounds );
|
|
|
|
int hits = 0;
|
|
for( int i = 0 ; i < numBounds ; i++ )
|
|
{
|
|
const shortBounds_t& listBounds = boundsList[i];
|
|
bool compare[8];
|
|
int count = 0;
|
|
for( int j = 0 ; j < 8 ; j++ )
|
|
{
|
|
if( ( ( short* )&compareBounds )[j] >= ( ( short* )&listBounds )[j] )
|
|
{
|
|
compare[j] = true;
|
|
count++;
|
|
}
|
|
else
|
|
{
|
|
compare[j] = false;
|
|
}
|
|
}
|
|
if( count == 8 )
|
|
{
|
|
returnedList[hits++] = i;
|
|
}
|
|
}
|
|
return hits;
|
|
}
|
|
|
|
|
|
|
|
idBoundsTrack::idBoundsTrack()
|
|
{
|
|
boundsList = ( shortBounds_t* )Mem_Alloc( MAX_BOUNDS_TRACK_INDEXES * sizeof( *boundsList ), TAG_RENDER );
|
|
ClearAll();
|
|
}
|
|
|
|
idBoundsTrack::~idBoundsTrack()
|
|
{
|
|
Mem_Free( boundsList );
|
|
}
|
|
|
|
void idBoundsTrack::ClearAll()
|
|
{
|
|
maxIndex = 0;
|
|
for( int i = 0 ; i < MAX_BOUNDS_TRACK_INDEXES ; i++ )
|
|
{
|
|
ClearIndex( i );
|
|
}
|
|
}
|
|
|
|
void idBoundsTrack::SetIndex( const int index, const idBounds& bounds )
|
|
{
|
|
assert( ( unsigned )index < MAX_BOUNDS_TRACK_INDEXES );
|
|
maxIndex = std::max( maxIndex, index + 1 );
|
|
boundsList[index].SetFromReferenceBounds( bounds );
|
|
}
|
|
|
|
void idBoundsTrack::ClearIndex( const int index )
|
|
{
|
|
assert( ( unsigned )index < MAX_BOUNDS_TRACK_INDEXES );
|
|
boundsList[index].SetToEmpty();
|
|
}
|
|
|
|
int idBoundsTrack::FindIntersections( const idBounds& testBounds, int intersectedIndexes[ MAX_BOUNDS_TRACK_INDEXES ] ) const
|
|
{
|
|
const shortBounds_t shortTestBounds( testBounds );
|
|
return FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes );
|
|
}
|
|
|
|
void idBoundsTrack::Test()
|
|
{
|
|
ClearAll();
|
|
idRandom r;
|
|
|
|
for( int i = 0 ; i < 1800 ; i++ )
|
|
{
|
|
idBounds b;
|
|
for( int j = 0 ; j < 3 ; j++ )
|
|
{
|
|
b[0][j] = r.RandomInt( 20000 ) - 10000;
|
|
b[1][j] = b[0][j] + r.RandomInt( 1000 );
|
|
}
|
|
SetIndex( i, b );
|
|
}
|
|
|
|
const idBounds testBounds( idVec3( -1000, 2000, -3000 ), idVec3( 1500, 4500, -500 ) );
|
|
SetIndex( 1800, testBounds );
|
|
SetIndex( 0, testBounds );
|
|
|
|
const shortBounds_t shortTestBounds( testBounds );
|
|
|
|
int intersectedIndexes1[ MAX_BOUNDS_TRACK_INDEXES ];
|
|
const int numHits1 = FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes1 );
|
|
|
|
int intersectedIndexes2[ MAX_BOUNDS_TRACK_INDEXES ];
|
|
const int numHits2 = FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
|
|
idLib::Printf( "%i intersections\n", numHits1 );
|
|
if( numHits1 != numHits2 )
|
|
{
|
|
idLib::Printf( "different results\n" );
|
|
}
|
|
else
|
|
{
|
|
for( int i = 0 ; i < numHits1 ; i++ )
|
|
{
|
|
if( intersectedIndexes1[i] != intersectedIndexes2[i] )
|
|
{
|
|
idLib::Printf( "different results\n" );
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// run again for debugging failure
|
|
FindBoundsIntersectionsTEST( shortTestBounds, boundsList, maxIndex, intersectedIndexes1 );
|
|
FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
|
|
|
|
// timing
|
|
const int64 start = Sys_Microseconds();
|
|
for( int i = 0 ; i < 40 ; i++ )
|
|
{
|
|
FindBoundsIntersectionsSimSIMD( shortTestBounds, boundsList, maxIndex, intersectedIndexes2 );
|
|
}
|
|
const int64 stop = Sys_Microseconds();
|
|
idLib::Printf( "%i microseconds for 40 itterations\n", stop - start );
|
|
}
|
|
|
|
|
|
|
|
class interactionPair_t
|
|
{
|
|
int entityIndex;
|
|
int lightIndex;
|
|
};
|
|
|
|
/*
|
|
|
|
keep a sorted list of static interactions and interactions already generated this frame?
|
|
|
|
determine if the light needs more exact culling because it is rotated or a spot light
|
|
for each entity on the bounds intersection list
|
|
if entity is not directly visible, determine if it can cast a shadow into the view
|
|
if the light center is in-frustum
|
|
and the entity bounds is out-of-frustum, it can't contribue
|
|
else the light center is off-frustum
|
|
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
|
|
if a static interaction exists
|
|
continue
|
|
possibly perform more exact refernce bounds to rotated or spot light
|
|
|
|
create an interaction pair and add it to the list
|
|
|
|
|
|
all models will have an interaction with light -1 for ambient surface
|
|
sort the interaction list by model
|
|
do
|
|
if the model is dynamic, create it
|
|
add the ambient surface and skip interaction -1
|
|
for all interactions
|
|
check for static interaction
|
|
check for current-frame interaction
|
|
else create shadow for this light
|
|
|
|
*/
|