llvopartgroup.cpp

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#include "llviewerprecompiledheaders.h"

#include "llvopartgroup.h"

#include "lldrawpoolalpha.h"

#include "llfasttimer.h"
#include "message.h"
#include "v2math.h"

#include "llagent.h"
#include "lldrawable.h"
#include "llface.h"
#include "llsky.h"
#include "llviewercamera.h"
#include "llviewerpartsim.h"
#include "llviewerregion.h"
#include "pipeline.h"
#include "llspatialpartition.h"

const F32 MAX_PART_LIFETIME = 120.f;

extern U64 gFrameTime;

LLVOPartGroup::LLVOPartGroup(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp)
        :       LLAlphaObject(id, pcode, regionp),
                mViewerPartGroupp(NULL)
{
        setNumTEs(1);
        setTETexture(0, LLUUID::null);
        mbCanSelect = FALSE;                    // users can't select particle systems
}


LLVOPartGroup::~LLVOPartGroup()
{
}


BOOL LLVOPartGroup::isActive() const
{
        return FALSE;
}

F32 LLVOPartGroup::getBinRadius()
{ 
        return mScale.mV[0]*2.f;
}

void LLVOPartGroup::updateSpatialExtents(LLVector3& newMin, LLVector3& newMax)
{               
        const LLVector3& pos_agent = getPositionAgent();
        newMin = pos_agent - mScale;
        newMax = pos_agent + mScale;
        mDrawable->setPositionGroup(pos_agent);
}

BOOL LLVOPartGroup::idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time)
{
        return TRUE;
}

void LLVOPartGroup::setPixelAreaAndAngle(LLAgent &agent)
{
        // mPixelArea is calculated during render
        F32 mid_scale = getMidScale();
        F32 range = (getRenderPosition()-LLViewerCamera::getInstance()->getOrigin()).magVec();

        if (range < 0.001f || isHUDAttachment())                // range == zero
        {
                mAppAngle = 180.f;
        }
        else
        {
                mAppAngle = (F32) atan2( mid_scale, range) * RAD_TO_DEG;
        }
}

void LLVOPartGroup::updateTextures(LLAgent &agent)
{
        // Texture stats for particles need to be updated in a different way...
}


LLDrawable* LLVOPartGroup::createDrawable(LLPipeline *pipeline)
{
        pipeline->allocDrawable(this);
        mDrawable->setLit(FALSE);
        mDrawable->setRenderType(LLPipeline::RENDER_TYPE_PARTICLES);
        return mDrawable;
}

 const F32 MAX_PARTICLE_AREA_SCALE = 0.02f; // some tuned constant, limits on how much particle area to draw

F32 LLVOPartGroup::getPartSize(S32 idx)
{
        if (idx < (S32) mViewerPartGroupp->mParticles.size())
        {
                return mViewerPartGroupp->mParticles[idx]->mScale.mV[0];
        }

        return 0.f;
}

BOOL LLVOPartGroup::updateGeometry(LLDrawable *drawable)
{
        LLFastTimer ftm(LLFastTimer::FTM_UPDATE_PARTICLES);

        dirtySpatialGroup();

        LLVector3 at;
        LLVector3 position_agent;
        LLVector3 camera_agent = LLViewerCamera::getInstance()->getOrigin();
        
        S32 num_parts = mViewerPartGroupp->getCount();
        LLFace *facep;
        LLSpatialGroup* group = drawable->getSpatialGroup();
        if (!group && num_parts)
        {
                drawable->movePartition();
                group = drawable->getSpatialGroup();
        }

        if (!num_parts)
        {
                if (group && drawable->getNumFaces())
                {
                        group->setState(LLSpatialGroup::GEOM_DIRTY);
                }
                drawable->setNumFaces(0, NULL, getTEImage(0));
                LLPipeline::sCompiles++;
                return TRUE;
        }

        if (!(gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_PARTICLES)))
        {
                return TRUE;
        }

        if (num_parts > drawable->getNumFaces())
        {
                drawable->setNumFacesFast(num_parts+num_parts/4, NULL, getTEImage(0));
        }

        F32 tot_area = 0;

        F32 max_area = LLViewerPartSim::getMaxPartCount() * MAX_PARTICLE_AREA_SCALE; 
        F32 pixel_meter_ratio = LLViewerCamera::getInstance()->getPixelMeterRatio();
        pixel_meter_ratio *= pixel_meter_ratio;

        S32 count=0;
        S32 i;
        mDepth = 0.f;

        for (i = 0; i < num_parts; i++)
        {
                const LLViewerPart &part = *((LLViewerPart*) mViewerPartGroupp->mParticles[i]);

                LLVector3 part_pos_agent(part.mPosAgent);
                at = part_pos_agent - camera_agent;

                F32 camera_dist_squared = at.magVecSquared();
                F32 inv_camera_dist_squared;
                if (camera_dist_squared > 1.f)
                        inv_camera_dist_squared = 1.f / camera_dist_squared;
                else
                        inv_camera_dist_squared = 1.f;
                F32 area = part.mScale.mV[0] * part.mScale.mV[1] * inv_camera_dist_squared;
                tot_area = llmax(tot_area, area);
                
                if (tot_area > max_area)
                {
                        break;
                }
        
                count++;

                facep = drawable->getFace(i);
                if (!facep)
                {
                        llwarns << "No face found for index " << i << "!" << llendl;
                        continue;
                }

                facep->setTEOffset(i);
                const F32 NEAR_PART_DIST_SQ = 5.f*5.f;  // Only discard particles > 5 m from the camera
                const F32 MIN_PART_AREA = .005f*.005f;  // only less than 5 mm x 5 mm at 1 m from camera
                
                if (camera_dist_squared > NEAR_PART_DIST_SQ && area < MIN_PART_AREA)
                {
                        facep->setSize(0, 0);
                        continue;
                }

                facep->setSize(4, 6);
                
                facep->setViewerObject(this);

                if (part.mFlags & LLPartData::LL_PART_EMISSIVE_MASK)
                {
                        facep->setState(LLFace::FULLBRIGHT);
                }
                else
                {
                        facep->clearState(LLFace::FULLBRIGHT);
                }

                facep->mCenterLocal = part.mPosAgent;
                facep->setFaceColor(part.mColor);
                facep->setTexture(part.mImagep);

                mPixelArea = tot_area * pixel_meter_ratio;
                const F32 area_scale = 10.f; // scale area to increase priority a bit
                facep->setVirtualSize(mPixelArea*area_scale);
        }
        for (i = count; i < drawable->getNumFaces(); i++)
        {
                LLFace* facep = drawable->getFace(i);
                if (!facep)
                {
                        llwarns << "No face found for index " << i << "!" << llendl;
                        continue;
                }
                facep->setTEOffset(i);
                facep->setSize(0, 0);
        }

        mDrawable->movePartition();
        LLPipeline::sCompiles++;
        return TRUE;
}

void LLVOPartGroup::getGeometry(S32 idx,
                                                                LLStrider<LLVector3>& verticesp,
                                                                LLStrider<LLVector3>& normalsp, 
                                                                LLStrider<LLVector2>& texcoordsp,
                                                                LLStrider<LLColor4U>& colorsp, 
                                                                LLStrider<U16>& indicesp)
{
        if (idx >= (S32) mViewerPartGroupp->mParticles.size())
        {
                return;
        }

        const LLViewerPart &part = *((LLViewerPart*) (mViewerPartGroupp->mParticles[idx]));

        U32 vert_offset = mDrawable->getFace(idx)->getGeomIndex();

        
        LLVector3 part_pos_agent(part.mPosAgent);
        LLVector3 camera_agent = gAgent.getCameraPositionAgent();
        LLVector3 at = part_pos_agent - camera_agent;
        LLVector3 up, right;

        right = at % LLVector3(0.f, 0.f, 1.f);
        right.normVec();
        up = right % at;
        up.normVec();

        if (part.mFlags & LLPartData::LL_PART_FOLLOW_VELOCITY_MASK)
        {
                LLVector3 normvel = part.mVelocity;
                normvel.normVec();
                LLVector2 up_fracs;
                up_fracs.mV[0] = normvel*right;
                up_fracs.mV[1] = normvel*up;
                up_fracs.normVec();
                LLVector3 new_up;
                LLVector3 new_right;
                new_up = up_fracs.mV[0] * right + up_fracs.mV[1]*up;
                new_right = up_fracs.mV[1] * right - up_fracs.mV[0]*up;
                up = new_up;
                right = new_right;
                up.normVec();
                right.normVec();
        }

        right *= 0.5f*part.mScale.mV[0];
        up *= 0.5f*part.mScale.mV[1];

        const LLVector3& normal = -LLViewerCamera::getInstance()->getXAxis();
                
        *verticesp++ = part_pos_agent + up - right;
        *verticesp++ = part_pos_agent - up - right;
        *verticesp++ = part_pos_agent + up + right;
        *verticesp++ = part_pos_agent - up + right;

        *colorsp++ = part.mColor;
        *colorsp++ = part.mColor;
        *colorsp++ = part.mColor;
        *colorsp++ = part.mColor;

        *texcoordsp++ = LLVector2(0.f, 1.f);
        *texcoordsp++ = LLVector2(0.f, 0.f);
        *texcoordsp++ = LLVector2(1.f, 1.f);
        *texcoordsp++ = LLVector2(1.f, 0.f);

        *normalsp++   = normal;
        *normalsp++   = normal;
        *normalsp++   = normal;
        *normalsp++   = normal;

        *indicesp++ = vert_offset + 0;
        *indicesp++ = vert_offset + 1;
        *indicesp++ = vert_offset + 2;

        *indicesp++ = vert_offset + 1;
        *indicesp++ = vert_offset + 3;
        *indicesp++ = vert_offset + 2;
}

U32 LLVOPartGroup::getPartitionType() const
{ 
        return LLViewerRegion::PARTITION_PARTICLE; 
}

LLParticlePartition::LLParticlePartition()
: LLSpatialPartition(LLDrawPoolAlpha::VERTEX_DATA_MASK)
{
        mRenderPass = LLRenderPass::PASS_ALPHA;
        mDrawableType = LLPipeline::RENDER_TYPE_PARTICLES;
        mPartitionType = LLViewerRegion::PARTITION_PARTICLE;
        mBufferUsage = GL_DYNAMIC_DRAW_ARB;
        mSlopRatio = 0.f;
        mLODPeriod = 1;
}

void LLParticlePartition::addGeometryCount(LLSpatialGroup* group, U32& vertex_count, U32& index_count)
{
        group->mBufferUsage = mBufferUsage;

        mFaceList.clear();

        for (LLSpatialGroup::element_iter i = group->getData().begin(); i != group->getData().end(); ++i)
        {
                LLDrawable* drawablep = *i;
                
                if (drawablep->isDead())
                {
                        continue;
                }

                LLAlphaObject* obj = (LLAlphaObject*) drawablep->getVObj().get();
                obj->mDepth = 0.f;
                
                if (drawablep->isAnimating())
                {
                        group->mBufferUsage = GL_STREAM_DRAW_ARB;
                }

                U32 count = 0;
                for (S32 j = 0; j < drawablep->getNumFaces(); ++j)
                {
                        drawablep->updateFaceSize(j);

                        LLFace* facep = drawablep->getFace(j);
                        if ( !facep || !facep->hasGeometry())
                        {
                                continue;
                        }
                        
                        count++;
                        facep->mDistance = (facep->mCenterLocal - LLViewerCamera::getInstance()->getOrigin()) * LLViewerCamera::getInstance()->getAtAxis();
                        obj->mDepth += facep->mDistance;
                        
                        mFaceList.push_back(facep);
                        vertex_count += facep->getGeomCount();
                        index_count += facep->getIndicesCount();
                }
                
                obj->mDepth /= count;
        }
}

void LLParticlePartition::getGeometry(LLSpatialGroup* group)
{
        LLMemType mt(LLMemType::MTYPE_SPACE_PARTITION);
        LLFastTimer ftm(LLFastTimer::FTM_REBUILD_PARTICLE_VB);

        std::sort(mFaceList.begin(), mFaceList.end(), LLFace::CompareDistanceGreater());

        U32 index_count = 0;
        U32 vertex_count = 0;

        group->clearDrawMap();

        LLVertexBuffer* buffer = group->mVertexBuffer;

        LLStrider<U16> indicesp;
        LLStrider<LLVector3> verticesp;
        LLStrider<LLVector3> normalsp;
        LLStrider<LLVector2> texcoordsp;
        LLStrider<LLColor4U> colorsp;

        buffer->getVertexStrider(verticesp);
        buffer->getNormalStrider(normalsp);
        buffer->getColorStrider(colorsp);
        buffer->getTexCoordStrider(texcoordsp);
        buffer->getIndexStrider(indicesp);

        LLSpatialGroup::drawmap_elem_t& draw_vec = group->mDrawMap[mRenderPass];        

        for (std::vector<LLFace*>::iterator i = mFaceList.begin(); i != mFaceList.end(); ++i)
        {
                LLFace* facep = *i;
                LLAlphaObject* object = (LLAlphaObject*) facep->getViewerObject();
                facep->setGeomIndex(vertex_count);
                facep->setIndicesIndex(index_count);
                facep->mVertexBuffer = buffer;
                facep->setPoolType(LLDrawPool::POOL_ALPHA);
                object->getGeometry(facep->getTEOffset(), verticesp, normalsp, texcoordsp, colorsp, indicesp);
                
                vertex_count += facep->getGeomCount();
                index_count += facep->getIndicesCount();

                S32 idx = draw_vec.size()-1;

                BOOL fullbright = facep->isState(LLFace::FULLBRIGHT);
                F32 vsize = facep->getVirtualSize();

                if (idx >= 0 && draw_vec[idx]->mEnd == facep->getGeomIndex()-1 &&
                        draw_vec[idx]->mTexture == facep->getTexture() &&
                        (U16) (draw_vec[idx]->mEnd - draw_vec[idx]->mStart + facep->getGeomCount()) <= (U32) gGLManager.mGLMaxVertexRange &&
                        //draw_vec[idx]->mCount + facep->getIndicesCount() <= (U32) gGLManager.mGLMaxIndexRange &&
                        draw_vec[idx]->mEnd - draw_vec[idx]->mStart + facep->getGeomCount() < 4096 &&
                        draw_vec[idx]->mFullbright == fullbright)
                {
                        draw_vec[idx]->mCount += facep->getIndicesCount();
                        draw_vec[idx]->mEnd += facep->getGeomCount();
                        draw_vec[idx]->mVSize = llmax(draw_vec[idx]->mVSize, vsize);
                }
                else
                {
                        U32 start = facep->getGeomIndex();
                        U32 end = start + facep->getGeomCount()-1;
                        U32 offset = facep->getIndicesStart();
                        U32 count = facep->getIndicesCount();
                        LLDrawInfo* info = new LLDrawInfo(start,end,count,offset,facep->getTexture(), buffer, fullbright); 
                        info->mVSize = vsize;
                        draw_vec.push_back(info);
                }
        }

        buffer->setBuffer(0);
        mFaceList.clear();
}

F32 LLParticlePartition::calcPixelArea(LLSpatialGroup* group, LLCamera& camera)
{
        return 1024.f;
}

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