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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.
*/
#pragma once
/** \file
* \ingroup fn
*
* Field serve as an intermediate representation for calculation of a group of functions. Having
* an intermediate representation is helpful mainly to separate the execution system from the
* system that describes the necessary computations. Fields can be executed in different contexts,
* and optimization might mean executing the fields differently based on some factors like the
* number of elements.
*
* For now, fields are very tied to the multi-function system, but in the future the #FieldFunction
* class could be extended to use different descriptions of its outputs and computation besides
* the embedded multi-function.
*/
#include "BLI_string_ref.hh"
#include "BLI_vector.hh"
#include "FN_generic_virtual_array.hh"
#include "FN_multi_function_builder.hh"
#include "FN_multi_function_procedure.hh"
#include "FN_multi_function_procedure_builder.hh"
#include "FN_multi_function_procedure_executor.hh"
namespace blender::fn {
class FieldSource {
public:
~FieldSource() = default;
virtual const CPPType &cpp_type_of_output_index(int output_index) const = 0;
virtual bool is_context_source() const
{
return false;
}
virtual bool is_operation_source() const
{
return false;
}
virtual uint64_t hash() const
{
return get_default_hash(this);
}
friend bool operator==(const FieldSource &a, const FieldSource &b)
{
return a.is_equal_to(b);
}
virtual bool is_equal_to(const FieldSource &other) const
{
return this == &other;
}
};
/**
* Descibes the output of a function. Generally corresponds to the combination of an output socket
* and link combination in a node graph.
*/
class GField {
std::shared_ptr<FieldSource> source_;
int source_output_index_ = 0;
public:
GField() = default;
GField(std::shared_ptr<FieldSource> source, const int source_output_index = 0)
: source_(std::move(source)), source_output_index_(source_output_index)
{
}
operator bool() const
{
return source_ != nullptr;
}
const fn::CPPType &cpp_type() const
{
return source_->cpp_type_of_output_index(source_output_index_);
}
bool has_context_source() const
{
return source_->is_context_source();
}
bool has_operation_source() const
{
return source_->is_operation_source();
}
const FieldSource &source() const
{
return *source_;
}
int source_output_index() const
{
return source_output_index_;
}
};
template<typename T> class Field : public GField {
public:
Field() = default;
Field(GField field) : GField(std::move(field))
{
BLI_assert(this->cpp_type().template is<T>());
}
Field(std::shared_ptr<FieldSource> source, const int source_output_index = 0)
: Field(GField(std::move(source), source_output_index))
{
}
};
class OperationFieldSource : public FieldSource {
std::unique_ptr<const MultiFunction> owned_function_;
const MultiFunction *function_;
blender::Vector<GField> inputs_;
public:
OperationFieldSource(std::unique_ptr<const MultiFunction> function, Vector<GField> inputs = {})
: owned_function_(std::move(function)), inputs_(std::move(inputs))
{
function_ = owned_function_.get();
}
OperationFieldSource(const MultiFunction &function, Vector<GField> inputs = {})
: function_(&function), inputs_(std::move(inputs))
{
}
Span<GField> inputs() const
{
return inputs_;
}
const MultiFunction &multi_function() const
{
return *function_;
}
bool is_operation_source() const override
{
return true;
}
const CPPType &cpp_type_of_output_index(int output_index) const override
{
int output_counter = 0;
for (const int param_index : function_->param_indices()) {
MFParamType param_type = function_->param_type(param_index);
if (param_type.is_output()) {
if (output_counter == output_index) {
return param_type.data_type().single_type();
}
output_counter++;
}
}
BLI_assert_unreachable();
return CPPType::get<float>();
}
};
class ContextFieldSource;
class FieldContext {
public:
~FieldContext() = default;
virtual const GVArray *try_get_varray_for_context(const ContextFieldSource &context_source,
IndexMask mask,
ResourceScope &scope) const;
};
class ContextFieldSource : public FieldSource {
protected:
const CPPType *type_;
std::string debug_name_;
public:
ContextFieldSource(const CPPType &type, std::string debug_name = "")
: type_(&type), debug_name_(std::move(debug_name))
{
}
virtual const GVArray *try_get_varray_for_context(const FieldContext &context,
IndexMask mask,
ResourceScope &scope) const = 0;
blender::StringRef debug_name() const
{
return debug_name_;
}
const CPPType &cpp_type() const
{
return *type_;
}
const CPPType &cpp_type_of_output_index(int output_index) const override
{
BLI_assert(output_index == 0);
UNUSED_VARS_NDEBUG(output_index);
return *type_;
}
bool is_context_source() const override
{
return true;
}
};
Vector<const GVArray *> evaluate_fields(ResourceScope &scope,
Span<const GField *> fields_to_evaluate,
IndexMask mask,
const FieldContext &context,
Span<GVMutableArray *> dst_hints = {});
void evaluate_constant_field(const GField &field, void *r_value);
void evaluate_fields_to_spans(Span<const GField *> fields_to_evaluate,
IndexMask mask,
const FieldContext &context,
Span<GMutableSpan> out_spans);
template<typename T> T evaluate_constant_field(const Field<T> &field)
{
T value;
value.~T();
evaluate_constant_field(field, &value);
return value;
}
template<typename T> Field<T> make_constant_field(T value)
{
auto constant_fn = std::make_unique<fn::CustomMF_Constant<T>>(std::forward<T>(value));
auto operation = std::make_shared<OperationFieldSource>(std::move(constant_fn));
return Field<T>{GField{std::move(operation), 0}};
}
class FieldEvaluator : NonMovable, NonCopyable {
private:
struct OutputPointerInfo {
void *dst = nullptr;
void (*set)(void *dst, const GVArray &varray, ResourceScope &scope) = nullptr;
};
ResourceScope scope_;
const FieldContext &context_;
const IndexMask mask_;
Vector<GField> fields_to_evaluate_;
Vector<GVMutableArray *> dst_hints_;
Vector<const GVArray *> evaluated_varrays_;
Vector<OutputPointerInfo> output_pointer_infos_;
bool is_evaluated_ = false;
public:
/** Takes #mask by pointer because the mask has to live longer than the evaluator. */
FieldEvaluator(const FieldContext &context, const IndexMask *mask)
: context_(context), mask_(*mask)
{
}
/**
* \param field: Field to add to the evaluator.
* \param dst: Mutable virtual array that the evaluated result for this field is be written into.
*/
int add_with_destination(GField field, GVMutableArray &dst)
{
const int field_index = fields_to_evaluate_.append_and_get_index(std::move(field));
dst_hints_.append(&dst);
output_pointer_infos_.append({});
return field_index;
}
/** Same as above but typed. */
template<typename T> int add_with_destination(Field<T> field, VMutableArray<T> &dst)
{
GVMutableArray &generic_dst_hint = scope_.construct<GVMutableArray_For_VMutableArray<T>>(
__func__, dst);
return this->add_with_destination(GField(std::move(field)), generic_dst_hint);
}
/**
* \param field: Field to add to the evaluator.
* \param varray_ptr: Once #evaluate is called, the resulting virtual array will be will be
* assigned to the given position.
*/
template<typename T> int add(Field<T> field, const VArray<T> **varray_ptr)
{
const int field_index = fields_to_evaluate_.append_and_get_index(std::move(field));
dst_hints_.append(nullptr);
output_pointer_infos_.append(OutputPointerInfo{
varray_ptr, [](void *dst, const GVArray &varray, ResourceScope &scope) {
*(const VArray<T> **)dst = &*scope.construct<GVArray_Typed<T>>(__func__, varray);
}});
return field_index;
}
/**
* \return Index of the field in the evaluator. Can be used in the #get_evaluated methods.
*/
int add(GField field)
{
const int field_index = fields_to_evaluate_.append_and_get_index(std::move(field));
dst_hints_.append(nullptr);
output_pointer_infos_.append({});
return field_index;
}
/**
* Evaluate all fields on the evaluator. This can only be called once.
*/
void evaluate()
{
BLI_assert_msg(!is_evaluated_, "Cannot evaluate twice.");
Array<const GField *> fields(fields_to_evaluate_.size());
for (const int i : fields_to_evaluate_.index_range()) {
fields[i] = &fields_to_evaluate_[i];
}
evaluated_varrays_ = evaluate_fields(scope_, fields, mask_, context_, dst_hints_);
BLI_assert(fields_to_evaluate_.size() == evaluated_varrays_.size());
for (const int i : fields_to_evaluate_.index_range()) {
OutputPointerInfo &info = output_pointer_infos_[i];
if (info.dst != nullptr) {
info.set(info.dst, *evaluated_varrays_[i], scope_);
}
}
is_evaluated_ = true;
}
const GVArray &get_evaluated(const int field_index) const
{
BLI_assert(is_evaluated_);
return *evaluated_varrays_[field_index];
}
template<typename T> const VArray<T> &get_evaluated(const int field_index)
{
const GVArray &varray = this->get_evaluated(field_index);
GVArray_Typed<T> &typed_varray = scope_.construct<GVArray_Typed<T>>(__func__, varray);
return *typed_varray;
}
};
} // namespace blender::fn
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