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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.
*
* Copyright 2021, Blender Foundation.
*/
#include "BLI_rect.h"
#include "COM_ConstantFolder.h"
#include "COM_ConstantOperation.h"
#include "COM_SetColorOperation.h"
#include "COM_SetValueOperation.h"
#include "COM_SetVectorOperation.h"
#include "COM_WorkScheduler.h"
namespace blender::compositor {
using Link = NodeOperationBuilder::Link;
/**
* \param operations_builder: Contains all operations to fold.
* \param exec_system: Execution system.
*/
ConstantFolder::ConstantFolder(NodeOperationBuilder &operations_builder)
: operations_builder_(operations_builder)
{
BLI_rcti_init(&max_area_, INT_MIN, INT_MAX, INT_MIN, INT_MAX);
BLI_rcti_init(&first_elem_area_, 0, 1, 0, 1);
}
static bool is_constant_foldable(NodeOperation *operation)
{
if (operation->get_flags().can_be_constant && !operation->get_flags().is_constant_operation) {
for (int i = 0; i < operation->getNumberOfInputSockets(); i++) {
if (!operation->get_input_operation(i)->get_flags().is_constant_operation) {
return false;
}
}
return true;
}
return false;
}
static Vector<NodeOperation *> find_constant_foldable_operations(Span<NodeOperation *> operations)
{
Vector<NodeOperation *> foldable_ops;
for (NodeOperation *op : operations) {
if (is_constant_foldable(op)) {
foldable_ops.append(op);
}
}
return foldable_ops;
}
static ConstantOperation *create_constant_operation(DataType data_type, const float *constant_elem)
{
switch (data_type) {
case DataType::Color: {
SetColorOperation *color_op = new SetColorOperation();
color_op->setChannels(constant_elem);
return color_op;
}
case DataType::Vector: {
SetVectorOperation *vector_op = new SetVectorOperation();
vector_op->setVector(constant_elem);
return vector_op;
}
case DataType::Value: {
SetValueOperation *value_op = new SetValueOperation();
value_op->setValue(*constant_elem);
return value_op;
}
default: {
BLI_assert_msg(0, "Non implemented data type");
return nullptr;
}
}
}
ConstantOperation *ConstantFolder::fold_operation(NodeOperation *operation)
{
const DataType data_type = operation->getOutputSocket()->getDataType();
MemoryBuffer fold_buf(data_type, first_elem_area_);
Vector<MemoryBuffer *> input_bufs = get_constant_input_buffers(operation);
operation->render(&fold_buf, {first_elem_area_}, input_bufs);
MemoryBuffer *constant_buf = create_constant_buffer(data_type);
constant_buf->copy_from(&fold_buf, first_elem_area_);
ConstantOperation *constant_op = create_constant_operation(data_type, constant_buf->getBuffer());
operations_builder_.replace_operation_with_constant(operation, constant_op);
constant_buffers_.add_new(constant_op, constant_buf);
return constant_op;
}
MemoryBuffer *ConstantFolder::create_constant_buffer(const DataType data_type)
{
/* Create a single elem buffer with maximum area possible so readers can read any coordinate
* returning always same element. */
return new MemoryBuffer(data_type, max_area_, true);
}
Vector<MemoryBuffer *> ConstantFolder::get_constant_input_buffers(NodeOperation *operation)
{
const int num_inputs = operation->getNumberOfInputSockets();
Vector<MemoryBuffer *> inputs_bufs(num_inputs);
for (int i = 0; i < num_inputs; i++) {
BLI_assert(operation->get_input_operation(i)->get_flags().is_constant_operation);
ConstantOperation *constant_op = static_cast<ConstantOperation *>(
operation->get_input_operation(i));
MemoryBuffer *constant_buf = constant_buffers_.lookup_or_add_cb(constant_op, [=] {
MemoryBuffer *buf = create_constant_buffer(constant_op->getOutputSocket()->getDataType());
constant_op->render(buf, {first_elem_area_}, {});
return buf;
});
inputs_bufs[i] = constant_buf;
}
return inputs_bufs;
}
/** Returns constant operations resulted from folded operations. */
Vector<ConstantOperation *> ConstantFolder::try_fold_operations(Span<NodeOperation *> operations)
{
Vector<NodeOperation *> foldable_ops = find_constant_foldable_operations(operations);
if (foldable_ops.size() == 0) {
return Vector<ConstantOperation *>();
}
Vector<ConstantOperation *> new_folds;
for (NodeOperation *op : foldable_ops) {
ConstantOperation *constant_op = fold_operation(op);
new_folds.append(constant_op);
}
return new_folds;
}
/**
* Evaluate operations with constant elements into primitive constant operations.
*/
int ConstantFolder::fold_operations()
{
WorkScheduler::start(operations_builder_.context());
Vector<ConstantOperation *> last_folds = try_fold_operations(
operations_builder_.get_operations());
int folds_count = last_folds.size();
while (last_folds.size() > 0) {
Vector<NodeOperation *> ops_to_fold;
for (ConstantOperation *fold : last_folds) {
get_operation_output_operations(fold, ops_to_fold);
}
last_folds = try_fold_operations(ops_to_fold);
folds_count += last_folds.size();
}
WorkScheduler::stop();
delete_constant_buffers();
return folds_count;
}
void ConstantFolder::delete_constant_buffers()
{
for (MemoryBuffer *buf : constant_buffers_.values()) {
delete buf;
}
constant_buffers_.clear();
}
void ConstantFolder::get_operation_output_operations(NodeOperation *operation,
Vector<NodeOperation *> &r_outputs)
{
const Vector<Link> &links = operations_builder_.get_links();
for (const Link &link : links) {
if (&link.from()->getOperation() == operation) {
r_outputs.append(&link.to()->getOperation());
}
}
}
} // namespace blender::compositor
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