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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2022 NVIDIA Corporation
* Copyright 2022 Blender Foundation */
#include "hydra/curves.h"
#include "hydra/geometry.inl"
#include "scene/hair.h"
#include <pxr/imaging/hd/extComputationUtils.h>
HDCYCLES_NAMESPACE_OPEN_SCOPE
HdCyclesCurves::HdCyclesCurves(const SdfPath &rprimId
#if PXR_VERSION < 2102
,
const SdfPath &instancerId
#endif
)
: HdCyclesGeometry(rprimId
#if PXR_VERSION < 2102
,
instancerId
#endif
)
{
}
HdCyclesCurves::~HdCyclesCurves()
{
}
HdDirtyBits HdCyclesCurves::GetInitialDirtyBitsMask() const
{
HdDirtyBits bits = HdCyclesGeometry::GetInitialDirtyBitsMask();
bits |= HdChangeTracker::DirtyPoints | HdChangeTracker::DirtyWidths |
HdChangeTracker::DirtyPrimvar | HdChangeTracker::DirtyTopology;
return bits;
}
HdDirtyBits HdCyclesCurves::_PropagateDirtyBits(HdDirtyBits bits) const
{
if (bits & (HdChangeTracker::DirtyTopology)) {
// Changing topology clears the geometry, so need to populate everything again
bits |= HdChangeTracker::DirtyPoints | HdChangeTracker::DirtyWidths |
HdChangeTracker::DirtyPrimvar;
}
return bits;
}
void HdCyclesCurves::Populate(HdSceneDelegate *sceneDelegate, HdDirtyBits dirtyBits, bool &rebuild)
{
if (HdChangeTracker::IsTopologyDirty(dirtyBits, GetId())) {
PopulateTopology(sceneDelegate);
}
if (dirtyBits & HdChangeTracker::DirtyPoints) {
PopulatePoints(sceneDelegate);
}
if (dirtyBits & HdChangeTracker::DirtyWidths) {
PopulateWidths(sceneDelegate);
}
if (dirtyBits & HdChangeTracker::DirtyPrimvar) {
PopulatePrimvars(sceneDelegate);
}
rebuild = (_geom->curve_keys_is_modified()) || (_geom->curve_radius_is_modified());
}
void HdCyclesCurves::PopulatePoints(HdSceneDelegate *sceneDelegate)
{
VtValue value;
for (const HdExtComputationPrimvarDescriptor &desc :
sceneDelegate->GetExtComputationPrimvarDescriptors(GetId(), HdInterpolationVertex)) {
if (desc.name == HdTokens->points) {
auto valueStore = HdExtComputationUtils::GetComputedPrimvarValues({desc}, sceneDelegate);
const auto valueStoreIt = valueStore.find(desc.name);
if (valueStoreIt != valueStore.end()) {
value = std::move(valueStoreIt->second);
}
break;
}
}
if (value.IsEmpty()) {
value = GetPrimvar(sceneDelegate, HdTokens->points);
}
if (!value.IsHolding<VtVec3fArray>()) {
TF_WARN("Invalid points data for %s", GetId().GetText());
return;
}
const auto &points = value.UncheckedGet<VtVec3fArray>();
array<float3> pointsDataCycles;
pointsDataCycles.reserve(points.size());
for (const GfVec3f &point : points) {
pointsDataCycles.push_back_reserved(make_float3(point[0], point[1], point[2]));
}
_geom->set_curve_keys(pointsDataCycles);
}
void HdCyclesCurves::PopulateWidths(HdSceneDelegate *sceneDelegate)
{
VtValue value = GetPrimvar(sceneDelegate, HdTokens->widths);
const HdInterpolation interpolation = GetPrimvarInterpolation(sceneDelegate, HdTokens->widths);
if (!value.IsHolding<VtFloatArray>()) {
TF_WARN("Invalid widths data for %s", GetId().GetText());
return;
}
const auto &widths = value.UncheckedGet<VtFloatArray>();
array<float> radiusDataCycles;
radiusDataCycles.reserve(widths.size());
if (interpolation == HdInterpolationConstant) {
TF_VERIFY(widths.size() == 1);
const float constantRadius = widths[0] * 0.5f;
for (size_t i = 0; i < _geom->num_keys(); ++i) {
radiusDataCycles.push_back_reserved(constantRadius);
}
}
else if (interpolation == HdInterpolationVertex) {
TF_VERIFY(widths.size() == _geom->num_keys());
for (size_t i = 0; i < _geom->num_keys(); ++i) {
radiusDataCycles.push_back_reserved(widths[i] * 0.5f);
}
}
_geom->set_curve_radius(radiusDataCycles);
}
void HdCyclesCurves::PopulatePrimvars(HdSceneDelegate *sceneDelegate)
{
Scene *const scene = (Scene *)_geom->get_owner();
const std::pair<HdInterpolation, AttributeElement> interpolations[] = {
std::make_pair(HdInterpolationVertex, ATTR_ELEMENT_CURVE_KEY),
std::make_pair(HdInterpolationVarying, ATTR_ELEMENT_CURVE_KEY),
std::make_pair(HdInterpolationUniform, ATTR_ELEMENT_CURVE),
std::make_pair(HdInterpolationConstant, ATTR_ELEMENT_OBJECT),
};
for (const auto &interpolation : interpolations) {
for (const HdPrimvarDescriptor &desc :
GetPrimvarDescriptors(sceneDelegate, interpolation.first)) {
// Skip special primvars that are handled separately
if (desc.name == HdTokens->points || desc.name == HdTokens->widths) {
continue;
}
VtValue value = GetPrimvar(sceneDelegate, desc.name);
if (value.IsEmpty()) {
continue;
}
const ustring name(desc.name.GetString());
AttributeStandard std = ATTR_STD_NONE;
if (desc.role == HdPrimvarRoleTokens->textureCoordinate) {
std = ATTR_STD_UV;
}
else if (desc.name == HdTokens->displayColor &&
interpolation.first == HdInterpolationConstant) {
if (value.IsHolding<VtVec3fArray>() && value.GetArraySize() == 1) {
const GfVec3f color = value.UncheckedGet<VtVec3fArray>()[0];
_instances[0]->set_color(make_float3(color[0], color[1], color[2]));
}
}
// Skip attributes that are not needed
if ((std != ATTR_STD_NONE && _geom->need_attribute(scene, std)) ||
_geom->need_attribute(scene, name)) {
ApplyPrimvars(_geom->attributes, name, value, interpolation.second, std);
}
}
}
}
void HdCyclesCurves::PopulateTopology(HdSceneDelegate *sceneDelegate)
{
// Clear geometry before populating it again with updated topology
_geom->clear(true);
HdBasisCurvesTopology topology = GetBasisCurvesTopology(sceneDelegate);
_geom->reserve_curves(topology.GetNumCurves(), topology.CalculateNeededNumberOfControlPoints());
const VtIntArray vertCounts = topology.GetCurveVertexCounts();
for (int curve = 0, key = 0; curve < topology.GetNumCurves(); ++curve) {
// Always reference shader at index zero, which is the primitive material
_geom->add_curve(key, 0);
key += vertCounts[curve];
}
}
HDCYCLES_NAMESPACE_CLOSE_SCOPE
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