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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.
*/
#ifndef __FN_ATTRIBUTES_REF_HH__
#define __FN_ATTRIBUTES_REF_HH__
/** \file
* \ingroup fn
*
* An AttributesRef references multiple arrays of equal length. Each array has a corresponding name
* and index.
*/
#include <optional>
#include "FN_spans.hh"
#include "BLI_linear_allocator.hh"
#include "BLI_map.hh"
#include "BLI_utility_mixins.hh"
#include "BLI_vector_set.hh"
namespace blender {
namespace fn {
class AttributesInfo;
class AttributesInfoBuilder : NonCopyable, NonMovable {
private:
LinearAllocator<> m_allocator;
VectorSet<std::string> m_names;
Vector<const CPPType *> m_types;
Vector<void *> m_defaults;
friend AttributesInfo;
public:
AttributesInfoBuilder() = default;
~AttributesInfoBuilder();
template<typename T> void add(StringRef name, const T &default_value)
{
this->add(name, CPPType::get<T>(), (const void *)&default_value);
}
void add(StringRef name, const CPPType &type, const void *default_value = nullptr);
};
/**
* Stores which attributes are in an AttributesRef. Every attribute has a unique index, a unique
* name, a type and a default value.
*/
class AttributesInfo : NonCopyable, NonMovable {
private:
LinearAllocator<> m_allocator;
Map<StringRefNull, uint> m_index_by_name;
Vector<StringRefNull> m_name_by_index;
Vector<const CPPType *> m_type_by_index;
Vector<void *> m_defaults;
public:
AttributesInfo() = default;
AttributesInfo(const AttributesInfoBuilder &builder);
~AttributesInfo();
uint size() const
{
return m_name_by_index.size();
}
IndexRange index_range() const
{
return m_name_by_index.index_range();
}
StringRefNull name_of(uint index) const
{
return m_name_by_index[index];
}
uint index_of(StringRef name) const
{
return m_index_by_name.lookup_as(name);
}
const void *default_of(uint index) const
{
return m_defaults[index];
}
const void *default_of(StringRef name) const
{
return this->default_of(this->index_of(name));
}
template<typename T> const T &default_of(uint index) const
{
BLI_assert(m_type_by_index[index]->is<T>());
return *(T *)m_defaults[index];
}
template<typename T> const T &default_of(StringRef name) const
{
return this->default_of<T>(this->index_of(name));
}
const CPPType &type_of(uint index) const
{
return *m_type_by_index[index];
}
const CPPType &type_of(StringRef name) const
{
return this->type_of(this->index_of(name));
}
bool has_attribute(StringRef name, const CPPType &type) const
{
return this->try_index_of(name, type) >= 0;
}
int try_index_of(StringRef name) const
{
return (int)m_index_by_name.lookup_default_as(name, -1);
}
int try_index_of(StringRef name, const CPPType &type) const
{
int index = this->try_index_of(name);
if (index == -1) {
return -1;
}
else if (this->type_of((uint)index) == type) {
return index;
}
else {
return -1;
}
}
};
/**
* References multiple arrays that match the description of an AttributesInfo instance. This class
* is supposed to be relatively cheap to copy. It does not own any of the arrays itself.
*/
class MutableAttributesRef {
private:
const AttributesInfo *m_info;
Span<void *> m_buffers;
IndexRange m_range;
public:
MutableAttributesRef(const AttributesInfo &info, Span<void *> buffers, uint size)
: MutableAttributesRef(info, buffers, IndexRange(size))
{
}
MutableAttributesRef(const AttributesInfo &info, Span<void *> buffers, IndexRange range)
: m_info(&info), m_buffers(buffers), m_range(range)
{
}
uint size() const
{
return m_range.size();
}
const AttributesInfo &info() const
{
return *m_info;
}
GMutableSpan get(uint index) const
{
const CPPType &type = m_info->type_of(index);
void *ptr = POINTER_OFFSET(m_buffers[index], type.size() * m_range.start());
return GMutableSpan(type, ptr, m_range.size());
}
GMutableSpan get(StringRef name) const
{
return this->get(m_info->index_of(name));
}
template<typename T> MutableSpan<T> get(uint index) const
{
BLI_assert(m_info->type_of(index).is<T>());
return MutableSpan<T>((T *)m_buffers[index] + m_range.start(), m_range.size());
}
template<typename T> MutableSpan<T> get(StringRef name) const
{
return this->get<T>(m_info->index_of(name));
}
std::optional<GMutableSpan> try_get(StringRef name, const CPPType &type) const
{
int index = m_info->try_index_of(name, type);
if (index == -1) {
return {};
}
else {
return this->get((uint)index);
}
}
template<typename T> std::optional<MutableSpan<T>> try_get(StringRef name) const
{
int index = m_info->try_index_of(name);
if (index == -1) {
return {};
}
else if (m_info->type_of((uint)index).is<T>()) {
return this->get<T>((uint)index);
}
else {
return {};
}
}
MutableAttributesRef slice(IndexRange range) const
{
return this->slice(range.start(), range.size());
}
MutableAttributesRef slice(uint start, uint size) const
{
return MutableAttributesRef(*m_info, m_buffers, m_range.slice(start, size));
}
};
} // namespace fn
} // namespace blender
#endif /* __FN_ATTRIBUTES_REF_HH__ */
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