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|
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "BKE_spline.hh"
#include "BKE_attribute_access.hh"
#include "BKE_attribute_math.hh"
#include "BKE_geometry_set.hh"
#include "attribute_access_intern.hh"
/* -------------------------------------------------------------------- */
/** \name Geometry Component Implementation
* \{ */
CurveComponent::CurveComponent() : GeometryComponent(GEO_COMPONENT_TYPE_CURVE)
{
}
CurveComponent::~CurveComponent()
{
this->clear();
}
GeometryComponent *CurveComponent::copy() const
{
CurveComponent *new_component = new CurveComponent();
if (curve_ != nullptr) {
new_component->curve_ = curve_->copy();
new_component->ownership_ = GeometryOwnershipType::Owned;
}
return new_component;
}
void CurveComponent::clear()
{
BLI_assert(this->is_mutable());
if (curve_ != nullptr) {
if (ownership_ == GeometryOwnershipType::Owned) {
delete curve_;
}
curve_ = nullptr;
}
}
bool CurveComponent::has_curve() const
{
return curve_ != nullptr;
}
/* Clear the component and replace it with the new curve. */
void CurveComponent::replace(CurveEval *curve, GeometryOwnershipType ownership)
{
BLI_assert(this->is_mutable());
this->clear();
curve_ = curve;
ownership_ = ownership;
}
CurveEval *CurveComponent::release()
{
BLI_assert(this->is_mutable());
CurveEval *curve = curve_;
curve_ = nullptr;
return curve;
}
const CurveEval *CurveComponent::get_for_read() const
{
return curve_;
}
CurveEval *CurveComponent::get_for_write()
{
BLI_assert(this->is_mutable());
if (ownership_ == GeometryOwnershipType::ReadOnly) {
curve_ = curve_->copy();
ownership_ = GeometryOwnershipType::Owned;
}
return curve_;
}
bool CurveComponent::is_empty() const
{
return curve_ == nullptr;
}
bool CurveComponent::owns_direct_data() const
{
return ownership_ == GeometryOwnershipType::Owned;
}
void CurveComponent::ensure_owns_direct_data()
{
BLI_assert(this->is_mutable());
if (ownership_ != GeometryOwnershipType::Owned) {
curve_ = curve_->copy();
ownership_ = GeometryOwnershipType::Owned;
}
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Attribute Access Helper Functions
* \{ */
int CurveComponent::attribute_domain_size(const AttributeDomain domain) const
{
if (curve_ == nullptr) {
return 0;
}
if (domain == ATTR_DOMAIN_POINT) {
int total = 0;
for (const SplinePtr &spline : curve_->splines()) {
total += spline->size();
}
return total;
}
if (domain == ATTR_DOMAIN_CURVE) {
return curve_->splines().size();
}
return 0;
}
static CurveEval *get_curve_from_component_for_write(GeometryComponent &component)
{
BLI_assert(component.type() == GEO_COMPONENT_TYPE_CURVE);
CurveComponent &curve_component = static_cast<CurveComponent &>(component);
return curve_component.get_for_write();
}
static const CurveEval *get_curve_from_component_for_read(const GeometryComponent &component)
{
BLI_assert(component.type() == GEO_COMPONENT_TYPE_CURVE);
const CurveComponent &curve_component = static_cast<const CurveComponent &>(component);
return curve_component.get_for_read();
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Builtin Spline Attributes
*
* Attributes with a value for every spline, stored contiguously or in every spline separately.
* \{ */
namespace blender::bke {
class BuiltinSplineAttributeProvider final : public BuiltinAttributeProvider {
using AsReadAttribute = GVArrayPtr (*)(const CurveEval &data);
using AsWriteAttribute = GVMutableArrayPtr (*)(CurveEval &data);
const AsReadAttribute as_read_attribute_;
const AsWriteAttribute as_write_attribute_;
public:
BuiltinSplineAttributeProvider(std::string attribute_name,
const CustomDataType attribute_type,
const WritableEnum writable,
const AsReadAttribute as_read_attribute,
const AsWriteAttribute as_write_attribute)
: BuiltinAttributeProvider(std::move(attribute_name),
ATTR_DOMAIN_CURVE,
attribute_type,
BuiltinAttributeProvider::NonCreatable,
writable,
BuiltinAttributeProvider::NonDeletable),
as_read_attribute_(as_read_attribute),
as_write_attribute_(as_write_attribute)
{
}
GVArrayPtr try_get_for_read(const GeometryComponent &component) const final
{
const CurveEval *curve = get_curve_from_component_for_read(component);
if (curve == nullptr) {
return {};
}
return as_read_attribute_(*curve);
}
GVMutableArrayPtr try_get_for_write(GeometryComponent &component) const final
{
if (writable_ != Writable) {
return {};
}
CurveEval *curve = get_curve_from_component_for_write(component);
if (curve == nullptr) {
return {};
}
return as_write_attribute_(*curve);
}
bool try_delete(GeometryComponent &UNUSED(component)) const final
{
return false;
}
bool try_create(GeometryComponent &UNUSED(component),
const AttributeInit &UNUSED(initializer)) const final
{
return false;
}
bool exists(const GeometryComponent &component) const final
{
return component.attribute_domain_size(ATTR_DOMAIN_CURVE) != 0;
}
};
static int get_spline_resolution(const SplinePtr &spline)
{
if (const BezierSpline *bezier_spline = dynamic_cast<const BezierSpline *>(spline.get())) {
return bezier_spline->resolution();
}
if (const NURBSpline *nurb_spline = dynamic_cast<const NURBSpline *>(spline.get())) {
return nurb_spline->resolution();
}
return 1;
}
static void set_spline_resolution(SplinePtr &spline, const int resolution)
{
if (BezierSpline *bezier_spline = dynamic_cast<BezierSpline *>(spline.get())) {
bezier_spline->set_resolution(std::max(resolution, 1));
}
if (NURBSpline *nurb_spline = dynamic_cast<NURBSpline *>(spline.get())) {
nurb_spline->set_resolution(std::max(resolution, 1));
}
}
static GVArrayPtr make_resolution_read_attribute(const CurveEval &curve)
{
return std::make_unique<fn::GVArray_For_DerivedSpan<SplinePtr, int, get_spline_resolution>>(
curve.splines());
}
static GVMutableArrayPtr make_resolution_write_attribute(CurveEval &curve)
{
return std::make_unique<fn::GVMutableArray_For_DerivedSpan<SplinePtr,
int,
get_spline_resolution,
set_spline_resolution>>(
curve.splines());
}
static bool get_cyclic_value(const SplinePtr &spline)
{
return spline->is_cyclic();
}
static void set_cyclic_value(SplinePtr &spline, const bool value)
{
if (spline->is_cyclic() != value) {
spline->set_cyclic(value);
spline->mark_cache_invalid();
}
}
static GVArrayPtr make_cyclic_read_attribute(const CurveEval &curve)
{
return std::make_unique<fn::GVArray_For_DerivedSpan<SplinePtr, bool, get_cyclic_value>>(
curve.splines());
}
static GVMutableArrayPtr make_cyclic_write_attribute(CurveEval &curve)
{
return std::make_unique<
fn::GVMutableArray_For_DerivedSpan<SplinePtr, bool, get_cyclic_value, set_cyclic_value>>(
curve.splines());
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Builtin Control Point Attributes
*
* Attributes with a value for every control point. Most of the complexity here is due to the fact
* that we must provide access to the attribute data as if it was a contiguous array when it is
* really stored separately on each spline. That will be inherently rather slow, but these virtual
* array implementations try to make it workable in common situations.
* \{ */
static Array<int> control_point_offsets(const CurveEval &curve)
{
Span<SplinePtr> splines = curve.splines();
Array<int> offsets(splines.size() + 1);
int size = 0;
for (const int spline_index : splines.index_range()) {
offsets[spline_index] = size;
size += splines[spline_index]->size();
}
offsets.last() = size;
return offsets;
}
namespace {
struct PointIndices {
int spline_index;
int point_index;
};
} // namespace
static PointIndices lookup_point_indices(Span<int> offsets, const int index)
{
const int spline_index = std::upper_bound(offsets.begin(), offsets.end(), index) -
offsets.begin() - 1;
const int index_in_spline = index - offsets[spline_index];
return {spline_index, index_in_spline};
}
template<typename T>
static void point_attribute_materialize(Span<Span<T>> data,
Span<int> offsets,
const IndexMask mask,
MutableSpan<T> r_span)
{
const int total_size = offsets.last();
if (mask.is_range() && mask.as_range() == IndexRange(total_size)) {
for (const int spline_index : data.index_range()) {
const int offset = offsets[spline_index];
const int next_offset = offsets[spline_index + 1];
initialized_copy_n(data[spline_index].data(), next_offset - offset, r_span.data() + offset);
}
}
else {
int spline_index = 0;
for (const int i : r_span.index_range()) {
const int dst_index = mask[i];
while (offsets[spline_index] < dst_index) {
spline_index++;
}
const int index_in_spline = dst_index - offsets[spline_index];
r_span[dst_index] = data[spline_index][index_in_spline];
}
}
}
template<typename T>
static void point_attribute_materialize_to_uninitialized(Span<Span<T>> data,
Span<int> offsets,
const IndexMask mask,
MutableSpan<T> r_span)
{
T *dst = r_span.data();
const int total_size = offsets.last();
if (mask.is_range() && mask.as_range() == IndexRange(total_size)) {
for (const int spline_index : data.index_range()) {
const int offset = offsets[spline_index];
const int next_offset = offsets[spline_index + 1];
uninitialized_copy_n(data[spline_index].data(), next_offset - offset, dst + offset);
}
}
else {
int spline_index = 0;
for (const int i : r_span.index_range()) {
const int dst_index = mask[i];
while (offsets[spline_index] < dst_index) {
spline_index++;
}
const int index_in_spline = dst_index - offsets[spline_index];
new (dst + dst_index) T(data[spline_index][index_in_spline]);
}
}
}
/**
* Virtual array for any control point data accessed with spans and an offset array.
*/
template<typename T> class VArray_For_SplinePoints : public VArray<T> {
private:
const Array<Span<T>> data_;
Array<int> offsets_;
public:
VArray_For_SplinePoints(Array<Span<T>> data, Array<int> offsets)
: VArray<T>(offsets.last()), data_(std::move(data)), offsets_(std::move(offsets))
{
}
T get_impl(const int64_t index) const final
{
const PointIndices indices = lookup_point_indices(offsets_, index);
return data_[indices.spline_index][indices.point_index];
}
void materialize_impl(const IndexMask mask, MutableSpan<T> r_span) const final
{
point_attribute_materialize(data_.as_span(), offsets_, mask, r_span);
}
void materialize_to_uninitialized_impl(const IndexMask mask, MutableSpan<T> r_span) const final
{
point_attribute_materialize_to_uninitialized(data_.as_span(), offsets_, mask, r_span);
}
};
/**
* Mutable virtual array for any control point data accessed with spans and an offset array.
*/
template<typename T> class VMutableArray_For_SplinePoints final : public VMutableArray<T> {
private:
Array<MutableSpan<T>> data_;
Array<int> offsets_;
public:
VMutableArray_For_SplinePoints(Array<MutableSpan<T>> data, Array<int> offsets)
: VMutableArray<T>(offsets.last()), data_(std::move(data)), offsets_(std::move(offsets))
{
}
T get_impl(const int64_t index) const final
{
const PointIndices indices = lookup_point_indices(offsets_, index);
return data_[indices.spline_index][indices.point_index];
}
void set_impl(const int64_t index, T value) final
{
const PointIndices indices = lookup_point_indices(offsets_, index);
data_[indices.spline_index][indices.point_index] = value;
}
void set_all_impl(Span<T> src) final
{
for (const int spline_index : data_.index_range()) {
const int offset = offsets_[spline_index];
const int next_offsets = offsets_[spline_index + 1];
data_[spline_index].copy_from(src.slice(offset, next_offsets - offset));
}
}
void materialize_impl(const IndexMask mask, MutableSpan<T> r_span) const final
{
point_attribute_materialize({(Span<T> *)data_.data(), data_.size()}, offsets_, mask, r_span);
}
void materialize_to_uninitialized_impl(const IndexMask mask, MutableSpan<T> r_span) const final
{
point_attribute_materialize_to_uninitialized(
{(Span<T> *)data_.data(), data_.size()}, offsets_, mask, r_span);
}
};
/**
* Virtual array implementation specifically for control point positions. This is only needed for
* Bezier splines, where adjusting the position also needs to adjust handle positions depending on
* the handle types. We pay a small price for this when other spline types are mixed with Bezier.
*
* \note There is no need to check the handle type to avoid changing auto handles, since
* retrieving write access to the position data will mark them for recomputation anyway.
*/
class VMutableArray_For_SplinePosition final : public VMutableArray<float3> {
private:
MutableSpan<SplinePtr> splines_;
Array<int> offsets_;
public:
VMutableArray_For_SplinePosition(MutableSpan<SplinePtr> splines, Array<int> offsets)
: VMutableArray<float3>(offsets.last()), splines_(splines), offsets_(std::move(offsets))
{
}
float3 get_impl(const int64_t index) const final
{
const PointIndices indices = lookup_point_indices(offsets_, index);
return splines_[indices.spline_index]->positions()[indices.point_index];
}
void set_impl(const int64_t index, float3 value) final
{
const PointIndices indices = lookup_point_indices(offsets_, index);
Spline &spline = *splines_[indices.spline_index];
if (BezierSpline *bezier_spline = dynamic_cast<BezierSpline *>(&spline)) {
const float3 delta = value - bezier_spline->positions()[indices.point_index];
bezier_spline->handle_positions_left()[indices.point_index] += delta;
bezier_spline->handle_positions_right()[indices.point_index] += delta;
bezier_spline->positions()[indices.point_index] = value;
}
else {
spline.positions()[indices.point_index] = value;
}
}
void set_all_impl(Span<float3> src) final
{
for (const int spline_index : splines_.index_range()) {
Spline &spline = *splines_[spline_index];
const int offset = offsets_[spline_index];
const int next_offset = offsets_[spline_index + 1];
if (BezierSpline *bezier_spline = dynamic_cast<BezierSpline *>(&spline)) {
MutableSpan<float3> positions = bezier_spline->positions();
MutableSpan<float3> handle_positions_left = bezier_spline->handle_positions_left();
MutableSpan<float3> handle_positions_right = bezier_spline->handle_positions_right();
for (const int i : IndexRange(next_offset - offset)) {
const float3 delta = src[offset + i] - positions[i];
handle_positions_left[i] += delta;
handle_positions_right[i] += delta;
positions[i] = src[offset + i];
}
}
else {
spline.positions().copy_from(src.slice(offset, next_offset - offset));
}
}
}
/** Utility so we can pass positions to the materialize functions above. */
Array<Span<float3>> get_position_spans() const
{
Array<Span<float3>> spans(splines_.size());
for (const int i : spans.index_range()) {
spans[i] = splines_[i]->positions();
}
return spans;
}
void materialize_impl(const IndexMask mask, MutableSpan<float3> r_span) const final
{
Array<Span<float3>> spans = this->get_position_spans();
point_attribute_materialize(spans.as_span(), offsets_, mask, r_span);
}
void materialize_to_uninitialized_impl(const IndexMask mask,
MutableSpan<float3> r_span) const final
{
Array<Span<float3>> spans = this->get_position_spans();
point_attribute_materialize_to_uninitialized(spans.as_span(), offsets_, mask, r_span);
}
};
/**
* Provider for any builtin control point attribute that doesn't need
* special handling such as access to other arrays in the spline.
*/
template<typename T> class BuiltinPointAttributeProvider : public BuiltinAttributeProvider {
protected:
using GetSpan = Span<T> (*)(const Spline &spline);
using GetMutableSpan = MutableSpan<T> (*)(Spline &spline);
using UpdateOnWrite = void (*)(Spline &spline);
const GetSpan get_span_;
const GetMutableSpan get_mutable_span_;
const UpdateOnWrite update_on_write_;
public:
BuiltinPointAttributeProvider(std::string attribute_name,
const WritableEnum writable,
const GetSpan get_span,
const GetMutableSpan get_mutable_span,
const UpdateOnWrite update_on_write)
: BuiltinAttributeProvider(std::move(attribute_name),
ATTR_DOMAIN_POINT,
bke::cpp_type_to_custom_data_type(CPPType::get<T>()),
BuiltinAttributeProvider::NonCreatable,
writable,
BuiltinAttributeProvider::NonDeletable),
get_span_(get_span),
get_mutable_span_(get_mutable_span),
update_on_write_(update_on_write)
{
}
GVArrayPtr try_get_for_read(const GeometryComponent &component) const
{
const CurveEval *curve = get_curve_from_component_for_read(component);
if (curve == nullptr) {
return {};
}
Span<SplinePtr> splines = curve->splines();
if (splines.size() == 1) {
return std::make_unique<fn::GVArray_For_GSpan>(get_span_(*splines.first()));
}
Array<int> offsets = control_point_offsets(*curve);
Array<Span<T>> spans(splines.size());
for (const int i : splines.index_range()) {
spans[i] = get_span_(*splines[i]);
}
return std::make_unique<fn::GVArray_For_EmbeddedVArray<T, VArray_For_SplinePoints<T>>>(
offsets.last(), std::move(spans), std::move(offsets));
}
GVMutableArrayPtr try_get_for_write(GeometryComponent &component) const
{
CurveEval *curve = get_curve_from_component_for_write(component);
if (curve == nullptr) {
return {};
}
MutableSpan<SplinePtr> splines = curve->splines();
if (splines.size() == 1) {
return std::make_unique<fn::GVMutableArray_For_GMutableSpan>(
get_mutable_span_(*splines.first()));
}
Array<int> offsets = control_point_offsets(*curve);
Array<MutableSpan<T>> spans(splines.size());
for (const int i : splines.index_range()) {
spans[i] = get_mutable_span_(*splines[i]);
if (update_on_write_) {
update_on_write_(*splines[i]);
}
}
return std::make_unique<
fn::GVMutableArray_For_EmbeddedVMutableArray<T, VMutableArray_For_SplinePoints<T>>>(
offsets.last(), std::move(spans), std::move(offsets));
}
bool try_delete(GeometryComponent &UNUSED(component)) const final
{
return false;
}
bool try_create(GeometryComponent &UNUSED(component),
const AttributeInit &UNUSED(initializer)) const final
{
return false;
}
bool exists(const GeometryComponent &component) const final
{
return component.attribute_domain_size(ATTR_DOMAIN_POINT) != 0;
}
};
/**
* Special attribute provider for the position attribute. Having this separate means we don't
* need to make #BuiltinPointAttributeProvider overly generic, and the special handling for the
* positions is more clear.
*/
class PositionAttributeProvider final : public BuiltinPointAttributeProvider<float3> {
public:
PositionAttributeProvider()
: BuiltinPointAttributeProvider(
"position",
BuiltinAttributeProvider::Writable,
[](const Spline &spline) { return spline.positions(); },
[](Spline &spline) { return spline.positions(); },
[](Spline &spline) { spline.mark_cache_invalid(); })
{
}
GVMutableArrayPtr try_get_for_write(GeometryComponent &component) const final
{
CurveEval *curve = get_curve_from_component_for_write(component);
if (curve == nullptr) {
return {};
}
/* Changing the positions requires recalculation of cached evaluated data in many cases.
* This could set more specific flags in the future to avoid unnecessary recomputation. */
bool curve_has_bezier_spline = false;
for (SplinePtr &spline : curve->splines()) {
if (spline->type() == Spline::Type::Bezier) {
curve_has_bezier_spline = true;
break;
}
}
/* Use the regular position virtual array there are any bezier splines to potentially avoid
* using the special position virtual array when there are no Bezier splines anyway. */
if (!curve_has_bezier_spline) {
return BuiltinPointAttributeProvider<float3>::try_get_for_write(component);
}
for (SplinePtr &spline : curve->splines()) {
spline->mark_cache_invalid();
}
Array<int> offsets = control_point_offsets(*curve);
return std::make_unique<
fn::GVMutableArray_For_EmbeddedVMutableArray<float3, VMutableArray_For_SplinePosition>>(
offsets.last(), curve->splines(), std::move(offsets));
}
};
/** \} */
/* -------------------------------------------------------------------- */
/** \name Attribute Provider Declaration
* \{ */
/**
* In this function all the attribute providers for a curve component are created. Most data
* in this function is statically allocated, because it does not change over time.
*/
static ComponentAttributeProviders create_attribute_providers_for_curve()
{
static BuiltinSplineAttributeProvider resolution("resolution",
CD_PROP_INT32,
BuiltinAttributeProvider::Writable,
make_resolution_read_attribute,
make_resolution_write_attribute);
static BuiltinSplineAttributeProvider cyclic("cyclic",
CD_PROP_BOOL,
BuiltinAttributeProvider::Writable,
make_cyclic_read_attribute,
make_cyclic_write_attribute);
static PositionAttributeProvider position;
static BuiltinPointAttributeProvider<float> radius(
"radius",
BuiltinAttributeProvider::Writable,
[](const Spline &spline) { return spline.radii(); },
[](Spline &spline) { return spline.radii(); },
nullptr);
static BuiltinPointAttributeProvider<float> tilt(
"tilt",
BuiltinAttributeProvider::Writable,
[](const Spline &spline) { return spline.tilts(); },
[](Spline &spline) { return spline.tilts(); },
[](Spline &spline) { spline.mark_cache_invalid(); });
return ComponentAttributeProviders({&position, &radius, &tilt, &resolution, &cyclic}, {});
}
} // namespace blender::bke
const blender::bke::ComponentAttributeProviders *CurveComponent::get_attribute_providers() const
{
static blender::bke::ComponentAttributeProviders providers =
blender::bke::create_attribute_providers_for_curve();
return &providers;
}
/** \} */
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