virtual void visit(const OctreeNode* branch)
{
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*) branch->getListener(0);
if(group)
{
group->clearOcclusionState(mState);
}
}
virtual void traverse(const OctreeNode* n)
{
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*) n->getListener(0);
if (group && group->isOcclusionState(mState))
{
OctreeTraveler::traverse(n);
}
}
virtual bool earlyFail(LLViewerOctreeGroup* base_group)
{
if( mUseObjectCacheOcclusion &&
base_group->getOctreeNode()->getParent()) //never occlusion cull the root node
{
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)base_group;
if (group->getOcclusionState() > 0) //occlusion state is not clear.
{
return true;
}
}
return false;
}
virtual void processGroup(LLViewerOctreeGroup* base_group)
{
if( !mUseObjectCacheOcclusion ||
!base_group->getOctreeNode()->getParent())
{
//no occlusion check
if(mRegionp->addVisibleGroup(base_group))
{
base_group->setVisible();
}
return;
}
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)base_group;
if(group->needsUpdate() || !group->isRecentlyVisible())//needs to issue new occlusion culling check.
{
mPartition->addOccluders(group);
group->setVisible();
return ; //wait for occlusion culling result
}
if(group->isOcclusionState(LLOcclusionCullingGroup::QUERY_PENDING) ||
group->isOcclusionState(LLOcclusionCullingGroup::ACTIVE_OCCLUSION))
{
//keep waiting
group->setVisible();
}
else
{
if(mRegionp->addVisibleGroup(base_group))
{
base_group->setVisible();
}
}
}
virtual bool earlyFail(LLViewerOctreeGroup* base_group)
{
if( mUseObjectCacheOcclusion &&
base_group->getOctreeNode()->getParent()) //never occlusion cull the root node
{
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)base_group;
if(group->needsUpdate())
{
//needs to issue new occlusion culling check, perform view culling check first.
return false;
}
group->checkOcclusion();
if (group->isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
{
return true;
}
}
return false;
}
bool LLVOCacheEntry::isAnyVisible(const LLVector4a& camera_origin, const LLVector4a& local_camera_origin, F32 dist_threshold)
{
LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)getGroup();
if(!group)
{
return false;
}
//any visible
bool vis = group->isAnyRecentlyVisible();
//not ready to remove
if(!vis)
{
S32 cur_vis = llmax(group->getAnyVisible(), (S32)getVisible());
vis = (cur_vis + sMinFrameRange > LLViewerOctreeEntryData::getCurrentFrame());
}
//within the back sphere
if(!vis && !mParentID && !group->isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
{
LLVector4a lookAt;
if(mBSphereRadius > 0.f)
{
lookAt.setSub(mBSphereCenter, local_camera_origin);
dist_threshold += mBSphereRadius;
}
else
{
lookAt.setSub(getPositionGroup(), camera_origin);
dist_threshold += getBinRadius();
}
vis = (lookAt.dot3(lookAt).getF32() < dist_threshold * dist_threshold);
}
return vis;
}
void LLOcclusionCullingGroup::checkOcclusion()
{
if (LLPipeline::sUseOcclusion > 1)
{
LLFastTimer t(FTM_OCCLUSION_READBACK);
LLOcclusionCullingGroup* parent = (LLOcclusionCullingGroup*)getParent();
if (parent && parent->isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
{ //if the parent has been marked as occluded, the child is implicitly occluded
clearOcclusionState(QUERY_PENDING | DISCARD_QUERY);
}
else if (isOcclusionState(QUERY_PENDING))
{ //otherwise, if a query is pending, read it back
GLuint available = 0;
if (mOcclusionQuery[LLViewerCamera::sCurCameraID])
{
glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_AVAILABLE_ARB, &available);
static LLCachedControl<bool> wait_for_query("RenderSynchronousOcclusion", true);
if (wait_for_query && mOcclusionIssued[LLViewerCamera::sCurCameraID] < gFrameCount)
{ //query was issued last frame, wait until it's available
S32 max_loop = 1024;
LLFastTimer t(FTM_OCCLUSION_WAIT);
while (!available && max_loop-- > 0)
{
F32 max_time = llmin(gFrameIntervalSeconds*10.f, 1.f);
//do some usefu work while we wait
LLAppViewer::getTextureCache()->update(max_time); // unpauses the texture cache thread
LLAppViewer::getImageDecodeThread()->update(max_time); // unpauses the image thread
LLAppViewer::getTextureFetch()->update(max_time); // unpauses the texture fetch thread
glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_AVAILABLE_ARB, &available);
}
}
}
else
{
available = 1;
}
if (available)
{ //result is available, read it back, otherwise wait until next frame
GLuint res = 1;
if (!isOcclusionState(DISCARD_QUERY) && mOcclusionQuery[LLViewerCamera::sCurCameraID])
{
glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_ARB, &res);
#if LL_TRACK_PENDING_OCCLUSION_QUERIES
sPendingQueries.erase(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
#endif
}
else if (mOcclusionQuery[LLViewerCamera::sCurCameraID])
{ //delete the query to avoid holding onto hundreds of pending queries
releaseOcclusionQueryObjectName(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
mOcclusionQuery[LLViewerCamera::sCurCameraID] = 0;
}
if (isOcclusionState(DISCARD_QUERY))
{
res = 2;
}
if (res > 0)
{
assert_states_valid(this);
clearOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
assert_states_valid(this);
}
else
{
assert_states_valid(this);
setOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
assert_states_valid(this);
}
clearOcclusionState(QUERY_PENDING | DISCARD_QUERY);
}
}
else if (mSpatialPartition->isOcclusionEnabled() && isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
{ //check occlusion has been issued for occluded node that has not had a query issued
assert_states_valid(this);
clearOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
assert_states_valid(this);
}
}
}
