mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-01-20 04:34:48 +00:00
137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
//-----------------------------------------------------------------------------
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// Copyright (c) 2012 GarageGames, LLC
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//-----------------------------------------------------------------------------
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#include "platform/platform.h"
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#include "T3D/fx/windEmitter.h"
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#include "math/mBox.h"
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#include "core/tAlgorithm.h"
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#include "platform/profiler.h"
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Vector<WindEmitter*> WindEmitter::smAllEmitters;
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WindEmitter::WindEmitter()
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{
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smAllEmitters.push_back( this );
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mEnabled = true;
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mScore = 0.0f;
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mSphere.center.zero();
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mSphere.radius = 0.0f;
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mStrength = 0.0f;
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mTurbulenceFrequency = 0.0f;
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mTurbulenceStrength = 0.0f;
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mVelocity.zero();
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}
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WindEmitter::~WindEmitter()
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{
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WindEmitterList::iterator iter = find( smAllEmitters.begin(), smAllEmitters.end(), this );
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smAllEmitters.erase( iter );
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}
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void WindEmitter::setPosition( const Point3F& pos )
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{
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mSphere.center = pos;
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}
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void WindEmitter::update( const Point3F& pos, const VectorF& velocity )
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{
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mSphere.center = pos;
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mVelocity = velocity;
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}
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void WindEmitter::setRadius( F32 radius )
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{
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mSphere.radius = radius;
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}
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void WindEmitter::setStrength( F32 strength )
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{
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mStrength = strength;
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}
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void WindEmitter::setTurbulency( F32 frequency, F32 strength )
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{
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mTurbulenceFrequency = frequency;
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mTurbulenceStrength = strength;
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}
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S32 QSORT_CALLBACK WindEmitter::_sortByScore(const void* a, const void* b)
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{
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return mSign((*(WindEmitter**)b)->mScore - (*(WindEmitter**)a)->mScore);
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}
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bool WindEmitter::findBest( const Point3F& cameraPos,
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const VectorF& cameraDir,
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F32 viewDistance,
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U32 maxResults,
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WindEmitterList* results )
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{
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PROFILE_START(WindEmitter_findBest);
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// Build a sphere from the camera point.
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SphereF cameraSphere;
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cameraSphere.center = cameraPos;
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cameraSphere.radius = viewDistance;
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// Collect the active spheres within the camera space and score them.
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WindEmitterList best;
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WindEmitterList::iterator iter = smAllEmitters.begin();
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for ( ; iter != smAllEmitters.end(); iter++ )
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{
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const SphereF& sphere = *(*iter);
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// Skip any spheres outside of our camera range or that are disabled.
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if ( !(*iter)->mEnabled || !cameraSphere.isIntersecting( sphere ) )
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continue;
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// Simple score calculation...
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//
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// score = ( radius / distance to camera ) * dot( cameraDir, vector from camera to sphere )
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//
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Point3F vect = sphere.center - cameraSphere.center;
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F32 dist = vect.len();
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(*iter)->mScore = dist * sphere.radius;
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vect /= getMax( dist, 0.001f );
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(*iter)->mScore *= mDot( vect, cameraDir );
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best.push_back( *iter );
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}
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// Sort the results by score!
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dQsort( best.address(), best.size(), sizeof(WindEmitter*), &WindEmitter::_sortByScore );
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// Clip the results to the max requested.
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if ( best.size() > maxResults )
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best.setSize( maxResults );
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// Merge the results and return.
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results->merge( best );
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PROFILE_END(); // WindEmitter_findBest
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return best.size() > 0;
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}
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