khanat-opennel-code/code/nel/src/3d/lighting_manager.cpp

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2010-05-06 00:08:41 +00:00
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "std3d.h"
#include "nel/3d/lighting_manager.h"
#include "nel/3d/point_light.h"
#include "nel/3d/transform.h"
#include "nel/misc/fast_floor.h"
#include "nel/3d/logic_info.h"
#include "nel/misc/aabbox.h"
#include "nel/misc/algo.h"
using namespace NLMISC;
using namespace std;
namespace NL3D {
// ***************************************************************************
/* LightQuadGrid setup. This is the same setup for StaticLightedModelQuadGrid setup.
NB: with this setup, a light will lies into 4*4=16 squares of a quadGrid at max.
*/
#define NL3D_LIGHT_QUAD_GRID_SIZE 128
#define NL3D_LIGHT_QUAD_GRID_ELTSIZE 10.f
#define NL3D_LIGHT_QUAD_GRID_RADIUS_LIMIT 20.f
// Factor for a level to the next: size/=factor, eltSize*=factor, and radiusLimit*=factor.
#define NL3D_LIGHT_QUAD_GRID_FACTOR 4
// this is a big radius for light that don't have attenuation
#define NL3D_DEFAULT_NOATT_LIGHT_RADIUS 1000.f
// this is used when the model is out of attBegin/attEnd, to modulate the influence
#define NL3D_DEFAULT_OUT_OF_ATT_LIGHT_INF_FACTOR 0.1f
// Defualt LightTransitionThreshold
#define NL3D_DEFAULT_LIGHT_TRANSITION_THRESHOLD 0.1f
// ***************************************************************************
CLightingManager::CLightingManager(bool bSmallScene)
{
// Init the lightQuadGrids and StaticLightedModelQuadGrid
// finer level.
uint qgSize= NL3D_LIGHT_QUAD_GRID_SIZE;
float eltSize= NL3D_LIGHT_QUAD_GRID_ELTSIZE;
float radiusLimit= NL3D_LIGHT_QUAD_GRID_RADIUS_LIMIT;
if (bSmallScene)
{
qgSize = 4;
}
// for all levels
for(uint i=0;i<NL3D_QUADGRID_LIGHT_NUM_LEVEL;i++)
{
// init _LightQuadGrid and _StaticLightedModelQuadGrid
_LightQuadGrid[i].create(qgSize, eltSize);
_StaticLightedModelQuadGrid[i].create(qgSize, eltSize);
_LightQuadGridRadiusLimit[i]= radiusLimit;
// coarser quadGrid level
qgSize/= NL3D_LIGHT_QUAD_GRID_FACTOR;
qgSize= max(qgSize, 1U);
eltSize*= NL3D_LIGHT_QUAD_GRID_FACTOR;
radiusLimit*= NL3D_LIGHT_QUAD_GRID_FACTOR;
}
// default paramters
_NoAttLightRadius= NL3D_DEFAULT_NOATT_LIGHT_RADIUS;
_OutOfAttLightInfFactor= NL3D_DEFAULT_OUT_OF_ATT_LIGHT_INF_FACTOR;
_LightTransitionThreshold= NL3D_DEFAULT_LIGHT_TRANSITION_THRESHOLD;
// Default number of pointLight on an object.
setMaxLightContribution(3);
}
// ***************************************************************************
void CLightingManager::setMaxLightContribution(uint nlights)
{
_MaxLightContribution= min(nlights, (uint)NL3D_MAX_LIGHT_CONTRIBUTION);
}
// ***************************************************************************
void CLightingManager::setNoAttLightRadius(float noAttLightRadius)
{
nlassert(noAttLightRadius>0);
_NoAttLightRadius= noAttLightRadius;
}
// ***************************************************************************
void CLightingManager::setOutOfAttLightInfFactor(float outOfAttLightInfFactor)
{
outOfAttLightInfFactor= max(0.f, outOfAttLightInfFactor);
_OutOfAttLightInfFactor= outOfAttLightInfFactor;
}
// ***************************************************************************
void CLightingManager::setLightTransitionThreshold(float lightTransitionThreshold)
{
clamp(lightTransitionThreshold, 0.f, 1.f);
_LightTransitionThreshold= lightTransitionThreshold;
}
// ***************************************************************************
void CLightingManager::clearDynamicLights()
{
// for all levels
for(uint i=0;i<NL3D_QUADGRID_LIGHT_NUM_LEVEL;i++)
{
// clear all the lights in the quadGrid.
_LightQuadGrid[i].clear();
}
// clear the list.
_DynamicLightList.clear();
}
// ***************************************************************************
void CLightingManager::addDynamicLight(CPointLight *light)
{
// Insert the light in the quadGrid.
//----------
CPointLightInfo plInfo;
plInfo.Light= light;
// build the bounding sphere for this light, with the AttenuationEnd of the light
float radius=light->getAttenuationEnd();
// if attenuation is disabled (ie getAttenuationEnd() return 0), then have a dummy radius
if(radius==0)
radius= _NoAttLightRadius;
plInfo.Sphere.Center= light->getPosition();
plInfo.Sphere.Radius= radius;
// build a bbox, so it includes the sphere
CVector bbmin= light->getPosition();
bbmin-= CVector(radius, radius, radius);
CVector bbmax= light->getPosition();
bbmax+= CVector(radius, radius, radius);
// choose the correct quadgrid according to the radius of the light.
uint qgId;
for(qgId= 0; qgId<NL3D_QUADGRID_LIGHT_NUM_LEVEL-1; qgId++)
{
// if radius is inferior to the requested radius for this quadGrid, ok!
if(radius<_LightQuadGridRadiusLimit[qgId])
break;
}
// insert this light in the correct quadgrid.
_LightQuadGrid[qgId].insert(bbmin, bbmax, plInfo);
// touch the objects around the lights.
//----------
// Select the static lightedModels to update around this light.
// Use the same level of _StaticLightedModelQuadGrid than me to not select too many squares in the quadGrid
_StaticLightedModelQuadGrid[qgId].select(bbmin, bbmax);
// For all those models.
CQuadGrid<CTransform*>::CIterator itModel= _StaticLightedModelQuadGrid[qgId].begin();
while(itModel != _StaticLightedModelQuadGrid[qgId].end() )
{
CTransform *model= *itModel;
const CVector &modelPos= model->getWorldMatrix().getPos();
// test first if this model is in the area of the light.
if( plInfo.Sphere.include(modelPos) )
{
// yes, then this model must recompute his lighting, because a dynamic light touch him.
model->resetLighting();
}
// next.
itModel++;
}
// insert the light in the list.
//----------
_DynamicLightList.push_back(light);
}
// ***************************************************************************
CLightingManager::CQGItLightedModel CLightingManager::eraseStaticLightedModel(CQGItLightedModel ite)
{
// Erase the iterator for all levels
for(uint i=0;i<NL3D_QUADGRID_LIGHT_NUM_LEVEL;i++)
{
// NB: it is possible here that the iterator is NULL (ie end()).
_StaticLightedModelQuadGrid[i].erase(ite.QgItes[i]);
}
// return end(), ie NULL iterators
return CQGItLightedModel();
}
// ***************************************************************************
CLightingManager::CQGItLightedModel CLightingManager::insertStaticLightedModel(CTransform *model)
{
CQGItLightedModel ite;
const CVector &worldPos= model->getWorldMatrix().getPos();
// Insert the models in all levels, because addDynamicLight() may choose the best suited level to select
for(uint i=0;i<NL3D_QUADGRID_LIGHT_NUM_LEVEL;i++)
{
ite.QgItes[i]= _StaticLightedModelQuadGrid[i].insert(worldPos, worldPos, model);
}
// return the iterator
return ite;
}
// ***************************************************************************
struct CSortLight
{
CPointLight *PointLight;
float Influence;
};
// ***************************************************************************
void CLightingManager::computeModelLightContributions(NLMISC::CRGBA sunAmbient, CTransform *model, CLightContribution &lightContrib,
ILogicInfo *logicInfo)
{
sint i;
// This is the list of light which touch this model.
static std::vector<CPointLightInfluence> lightList;
// static, for malloc perf.
lightList.clear();
// the position of the model.
CVector modelPos;
float modelRadius;
// depends on model
model->getLightHotSpotInWorld(modelPos, modelRadius);
// First pass, fill the list of light which touch this model.
//=========
// get the dynamic lights around the model
getDynamicPointLightList(modelPos, lightList);
// if not already precomputed, append staticLights to this list.
if( !lightContrib.FrozenStaticLightSetup )
{
// If no logicInfo provided
if(!logicInfo)
{
// Default: suppose full SunLight and no PointLights.
lightContrib.SunContribution= 255;
// Take full SunAmbient.
lightContrib.LocalAmbient= sunAmbient;
// do not append any pointLight to the setup
}
else
{
// NB: SunContribution is computed by logicInfo
logicInfo->getStaticLightSetup(sunAmbient, lightList, lightContrib.SunContribution, lightContrib.LocalAmbient);
}
}
// Second pass, in the lightList, choose the best suited light to lit this model
//=========
// for each light, modulate the factor of influence
for(i=0; i<(sint)lightList.size();i++)
{
CPointLight *pl= lightList[i].PointLight;
// get the distance from the light to the model
float dist= (pl->getPosition() - modelPos).norm();
float distMinusRadius= dist - modelRadius;
// modulate the factor by the distance and the attenuation distance.
float inf;
float attBegin= pl->getAttenuationBegin();
float attEnd= pl->getAttenuationEnd();
// if no attenuation
if( attEnd==0 )
{
// influence is awlays 1.
inf= 1;
// If SpotLight, must modulate with SpotAttenuation.
if(pl->getType() == CPointLight::SpotLight)
inf*= pl->computeLinearAttenuation(modelPos, dist, modelRadius);
}
else
{
// if correct attenuation radius
if(distMinusRadius<attBegin)
{
// NB: we are sure that attBegin>0, because dist>=0.
// if < attBegin, inf should be ==1, but must select the nearest lights; for better
// understanding of the scene
inf= 1 + _OutOfAttLightInfFactor * (attBegin - distMinusRadius); // inf E [1, +oo[
// NB: this formula favour big lights (ie light with big attBegin).
// If SpotLight, must modulate with SpotAttenuation.
if(pl->getType() == CPointLight::SpotLight)
inf*= pl->computeLinearAttenuation(modelPos, dist, modelRadius);
}
else if(distMinusRadius<attEnd)
{
// we are sure attEnd-attBegin>0 because of the test
// compute influence of the light: attenuation and SpotAttenuation
inf= pl->computeLinearAttenuation(modelPos, dist, modelRadius);
}
else
{
// if >= attEnd, inf should be ==0, but must select the nearest lights; for better
// understanding of the scene
inf= _OutOfAttLightInfFactor * (attEnd - distMinusRadius); // inf E ]-oo, 0]
}
}
// modulate the influence with this factor
lightList[i].BkupInfluence= lightList[i].Influence;
lightList[i].Influence*= inf;
// Bkup distance to model.
lightList[i].DistanceToModel= dist;
}
// sort the light by influence
sort(lightList.begin(), lightList.end());
// prepare Light Merging.
static std::vector<float> lightToMergeWeight;
lightToMergeWeight.clear();
lightToMergeWeight.resize(lightList.size(), 1);
// and choose only max light.
uint startId= 0;
uint ligthSrcId= 0;
// skip already setuped light (statically)
if(lightContrib.FrozenStaticLightSetup)
startId= lightContrib.NumFrozenStaticLight;
// If there is still place for unFrozen static lights or dynamic lights.
if(startId < _MaxLightContribution)
{
// setup the transition.
float deltaMinInfluence= _LightTransitionThreshold;
float minInfluence= 0;
sint doMerge= 0;
sint firstLightToMergeFull= _MaxLightContribution-startId;
// If there is more light than we can accept in not merged mode, Must merge
if((sint)lightList.size() > firstLightToMergeFull)
{
doMerge= 1;
// the minInfluence is the influence of the first light not taken.
minInfluence= lightList[firstLightToMergeFull].Influence;
// but must still be >=0.
minInfluence= max(minInfluence, 0.f);
}
// Any light under this minInfluence+deltaMinInfluence will be smoothly darken.
float minInfluenceStart = minInfluence + deltaMinInfluence;
float OOdeltaMinInfluence= 1.0f / deltaMinInfluence;
/* NB: this is not an error if we have only 3 light for example (assuming _MaxLightContribution=3),
and still have minInfluenceStart>0.
It's to have a continuity in the case of for example we have 3 lights in lightLists at frame T0,
resulting in "doMerge=0" and at frame T1 we have 4 lights, the farthest having an influence of 0
or nearly 0.
*/
// fill maxLight at max.
for(i=startId;i<(sint)_MaxLightContribution; i++)
{
// if not so many pointLights found, end!!
if(ligthSrcId>=lightList.size())
break;
else
{
CPointLight *pl= lightList[ligthSrcId].PointLight;
float inf= lightList[ligthSrcId].Influence;
float bkupInf= lightList[ligthSrcId].BkupInfluence;
float distToModel= lightList[ligthSrcId].DistanceToModel;
// else fill it.
lightContrib.PointLight[i]= pl;
// Compute the Final factor of influence of the light.
if(inf >= minInfluenceStart)
{
// For Static LightSetup BiLinear to work correctly, modulate with BkupInfluence
// don't worry about the precision of floor, because of *255.
lightContrib.Factor[i]= (uint8)NLMISC::OptFastFloor(bkupInf*255);
// Indicate that this light don't need to be merged at all!
lightToMergeWeight[ligthSrcId]= 0;
}
else
{
float f= (inf-minInfluence) * OOdeltaMinInfluence;
// For Static LightSetup BiLinear to work correctly, modulate with BkupInfluence
// don't worry about the precision of floor, because of *255.
sint fi= NLMISC::OptFastFloor( bkupInf*f*255 );
clamp(fi, 0, 255);
lightContrib.Factor[i]= fi;
// The rest of the light contribution is to be merged.
lightToMergeWeight[ligthSrcId]= 1-f;
}
// Compute the Final Att factor for models using Global Attenuation. NB: modulate with Factor
// don't worry about the precision of floor, because of *255.
// NB: compute att on the center of the model => modelRadius==0
sint attFactor= NLMISC::OptFastFloor( lightContrib.Factor[i] * pl->computeLinearAttenuation(modelPos, distToModel) );
lightContrib.AttFactor[i]= (uint8)attFactor;
// must append this lightedModel to the list in the light.
lightContrib.TransformIterator[i]= pl->appendLightedModel(model);
// next light.
ligthSrcId++;
}
}
// Compute LightToMerge.
if(doMerge)
{
CRGBAF mergedAmbient(0,0,0);
uint j;
// For all lights in the lightList, merge Diffuse and Ambient term to mergedAmbient.
for(j=0;j<lightToMergeWeight.size();j++)
{
if(lightToMergeWeight[j] && lightList[j].Influence>0)
{
CPointLight *pl= lightList[j].PointLight;
// Get the original influence (ie for static PLs, biLinear influence)
float bkupInf= lightList[j].BkupInfluence;
// Get the attenuation of the pointLight to the model
float distToModel= lightList[j].DistanceToModel;
float attInf= pl->computeLinearAttenuation(modelPos, distToModel);
// Attenuate the color of the light by biLinear and distance/spot attenuation.
float lightInf= attInf * bkupInf;
// Modulate also by the percentage to merge
lightInf*= lightToMergeWeight[j];
// Add the full ambient term of the light, attenuated by light attenuation and WeightMerge
mergedAmbient.R+= pl->getAmbient().R * lightInf;
mergedAmbient.G+= pl->getAmbient().G * lightInf;
mergedAmbient.B+= pl->getAmbient().B * lightInf;
// Add 0.25f of the diffuse term of the light, attenuated by light attenuation and WeightMerge
// mul by 0.25f, because this is the averaged contribution of the diffuse part of a
// light to a sphere (do the maths...).
float f= lightInf*0.25f;
mergedAmbient.R+= pl->getDiffuse().R * f;
mergedAmbient.G+= pl->getDiffuse().G * f;
mergedAmbient.B+= pl->getDiffuse().B * f;
}
}
// Setup the merged Light
CRGBA amb;
sint v;
// Because of floating point error, it appears that sometime result may be slightly below 0.
// => clamp necessary
v= NLMISC::OptFastFloor(mergedAmbient.R); fastClamp8(v); amb.R= v;
v= NLMISC::OptFastFloor(mergedAmbient.G); fastClamp8(v); amb.G= v;
v= NLMISC::OptFastFloor(mergedAmbient.B); fastClamp8(v); amb.B= v;
amb.A = 255;
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lightContrib.MergedPointLight= amb;
// Indicate we use the merged pointLight => the model must recompute lighting each frame
lightContrib.UseMergedPointLight= true;
}
else
{
// If the model is freezeHRC(), need to test each frame only if MergedPointLight is used.
lightContrib.UseMergedPointLight= false;
}
}
else
{
// point to end the list
i= startId;
}
// End the list.
if(i<NL3D_MAX_LIGHT_CONTRIBUTION)
{
lightContrib.PointLight[i]= NULL;
}
}
// ***************************************************************************
void CLightingManager::getDynamicPointLightList(const CVector &worldPos, std::vector<CPointLightInfluence> &lightList)
{
// For all quadGrids.
for(uint qgId=0; qgId<NL3D_QUADGRID_LIGHT_NUM_LEVEL; qgId++)
{
CQuadGrid<CPointLightInfo> &quadGrid= _LightQuadGrid[qgId];
// select the lights around this position in the quadGrids.
quadGrid.select(worldPos, worldPos);
// for all possible found lights
CQuadGrid<CPointLightInfo>::CIterator itLight;
for(itLight= quadGrid.begin(); itLight!=quadGrid.end(); itLight++)
{
// verify it includes the entity
if( (*itLight).Sphere.include(worldPos) )
{
// ok, insert in list.
CPointLightInfluence pli;
pli.PointLight= (*itLight).Light;
// No special Influence degradation scheme for Dynamic lighting
pli.Influence= 1;
lightList.push_back( pli );
}
}
}
}
} // NL3D