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Implemented texture pre-streaming for lod swaps

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--HG--
branch : nfb
This commit is contained in:
Kearwood Gilbert
2014-04-23 01:43:00 -07:00
parent 7194d39f7d
commit e9c17df900
29 changed files with 202 additions and 139 deletions
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25
KREngine/kraken/KRLODGroup.cpp
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@@ -102,15 +102,17 @@ void KRLODGroup::setReference(const KRAABB &reference)
m_reference = reference;
}
bool KRLODGroup::getLODVisibility(const KRViewport &viewport)
KRNode::LodVisibility KRLODGroup::calcLODVisibility(const KRViewport &viewport)
{
if(m_min_distance == 0 && m_max_distance == 0) {
return true;
return LOD_VISIBILITY_VISIBLE;
} else {
float lod_bias = viewport.getLODBias();
lod_bias = pow(2.0f, -lod_bias);
float sqr_distance; // Compare using squared distances as sqrt is expensive
// Compare using squared distances as sqrt is expensive
float sqr_distance;
float sqr_prestream_distance;
KRVector3 world_camera_position = viewport.getCameraPosition();
KRVector3 local_camera_position = worldToLocal(world_camera_position);
@@ -119,13 +121,24 @@ bool KRLODGroup::getLODVisibility(const KRViewport &viewport)
if(m_use_world_units) {
KRVector3 world_reference_point = localToWorld(local_reference_point);
sqr_distance = (world_camera_position - world_reference_point).sqrMagnitude() * (lod_bias * lod_bias);
sqr_prestream_distance = getContext().KRENGINE_PRESTREAM_DISTANCE * getContext().KRENGINE_PRESTREAM_DISTANCE;
} else {
sqr_distance = (local_camera_position - local_reference_point).sqrMagnitude() * (lod_bias * lod_bias);
KRVector3 world_reference_point = localToWorld(local_reference_point);
sqr_prestream_distance = worldToLocal(KRVector3::Normalize(world_reference_point - world_camera_position) * getContext().KRENGINE_PRESTREAM_DISTANCE).sqrMagnitude(); // TODO, FINDME - Optimize with precalc?
}
float sqr_min_distance = m_min_distance * m_min_distance;
float sqr_max_distance = m_max_distance * m_max_distance;
return ((sqr_distance >= sqr_min_distance || m_min_distance == 0) && (sqr_distance < sqr_max_distance || m_max_distance == 0));
float sqr_min_visible_distance = m_min_distance * m_min_distance;
float sqr_max_visible_distance = m_max_distance * m_max_distance;
if((sqr_distance >= sqr_min_visible_distance || m_min_distance == 0) && (sqr_distance < sqr_max_visible_distance || m_max_distance == 0)) {
return LOD_VISIBILITY_VISIBLE;
} else if((sqr_distance >= sqr_min_visible_distance - sqr_prestream_distance || m_min_distance == 0) && (sqr_distance < sqr_max_visible_distance + sqr_prestream_distance || m_max_distance == 0)) {
return LOD_VISIBILITY_PRESTREAM;
} else {
return LOD_VISIBILITY_HIDDEN;
}
}
}