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pgraphnodes: Support hardware instancing for LODNode

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LODNode will now correctly calculate LOD for individual instances.

It turns out implementing it for FadeLODNode is hard (wrt. tracking state for individual instances) so I have not bothered with supporting it - FadeLODNode instead calculates a single switch level for all instances based on the centroid of the visible instances.
This commit is contained in:
rdb 2020-11-26 16:47:35 +01:00
parent e13756f43e
commit 615502aef6
1 changed files with 74 additions and 19 deletions
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93
panda/src/pgraphnodes/lodNode.cxx
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@ -143,26 +143,64 @@ cull_callback(CullTraverser *trav, CullTraverserData &data) {
CDReader cdata(_cycler);
CPT(TransformState) rel_transform = get_rel_transform(trav, data);
LPoint3 center = cdata->_center * rel_transform->get_mat();
PN_stdfloat dist2 = center.dot(center);
PN_stdfloat lod_scale = cdata->_lod_scale *
trav->get_scene()->get_camera_node()->get_lod_scale();
int num_children = std::min(get_num_children(), (int)cdata->_switch_vector.size());
for (int index = 0; index < num_children; ++index) {
const Switch &sw = cdata->_switch_vector[index];
bool in_range;
if (cdata->_got_force_switch) {
in_range = (cdata->_force_switch == index);
} else {
in_range = sw.in_range_2(dist2 * cdata->_lod_scale
* trav->get_scene()->get_camera_node()->get_lod_scale());
if (data._instances == nullptr || cdata->_got_force_switch) {
LPoint3 center = cdata->_center * rel_transform->get_mat();
PN_stdfloat dist2 = center.dot(center);
for (int index = 0; index < num_children; ++index) {
const Switch &sw = cdata->_switch_vector[index];
bool in_range;
if (cdata->_got_force_switch) {
in_range = (cdata->_force_switch == index);
} else {
in_range = sw.in_range_2(dist2 * lod_scale);
}
if (in_range) {
// This switch level is in range. Draw its children.
PandaNode *child = get_child(index);
if (child != nullptr) {
CullTraverserData next_data(data, child);
trav->traverse(next_data);
}
}
}
}
else {
// Figure out which instances in which switch levels should be visible.
size_t num_instances = data._instances->size();
std::unique_ptr<BitArray[]> in_range(new BitArray[num_children]);
for (size_t ii = 0; ii < num_instances; ++ii) {
LPoint3 inst_center = cdata->_center *
rel_transform->compose((*data._instances)[ii].get_transform())->get_mat();
PN_stdfloat dist2 = inst_center.dot(inst_center);
for (int index = 0; index < num_children; ++index) {
const Switch &sw = cdata->_switch_vector[index];
if (!sw.in_range_2(dist2 * lod_scale)) {
in_range[index].set_bit(ii);
}
}
}
if (in_range) {
// This switch level is in range. Draw its children.
PandaNode *child = get_child(index);
if (child != nullptr) {
CullTraverserData next_data(data, child);
trav->traverse(next_data);
for (int index = 0; index < num_children; ++index) {
const Switch &sw = cdata->_switch_vector[index];
CPT(InstanceList) instances = data._instances->without(in_range[index]);
if (!instances->empty()) {
// At least one instance is visible in this switch level.
PandaNode *child = get_child(index);
if (child != nullptr) {
CullTraverserData next_data(data, child);
next_data._instances = instances;
trav->traverse(next_data);
}
}
}
}
@ -321,13 +359,30 @@ compute_child(CullTraverser *trav, CullTraverserData &data) {
return cdata->_force_switch;
}
PN_stdfloat lod_scale = cdata->_lod_scale *
trav->get_scene()->get_camera_node()->get_lod_scale();
CPT(TransformState) rel_transform = get_rel_transform(trav, data);
LPoint3 center = cdata->_center * rel_transform->get_mat();
LPoint3 center;
if (data._instances == nullptr) {
center = cdata->_center * rel_transform->get_mat();
}
else {
// Can't really do much with instancing in FadeLODNode; let's instead
// just calculate the centroid of the visible instances.
center = LPoint3(0);
for (const InstanceList::Instance &instance : *data._instances) {
center += cdata->_center *
rel_transform->compose(instance.get_transform())->get_mat();
}
center *= 1.0 / data._instances->size();
}
PN_stdfloat dist2 = center.dot(center);
for (int index = 0; index < (int)cdata->_switch_vector.size(); ++index) {
if (cdata->_switch_vector[index].in_range_2(dist2 * cdata->_lod_scale
* trav->get_scene()->get_camera_node()->get_lod_scale())) {
if (cdata->_switch_vector[index].in_range_2(dist2 * lod_scale)) {
if (pgraph_cat.is_debug()) {
pgraph_cat.debug()
<< data.get_node_path() << " at distance " << sqrt(dist2)