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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2022 Blender Foundation. All rights reserved. */
#include "DNA_node_types.h"
#include "NOD_derived_node_tree.hh"
#include "VPC_compile_state.hh"
#include "VPC_context.hh"
#include "VPC_evaluator.hh"
#include "VPC_gpu_material_operation.hh"
#include "VPC_input_single_value_operation.hh"
#include "VPC_node_operation.hh"
#include "VPC_operation.hh"
#include "VPC_result.hh"
#include "VPC_scheduler.hh"
#include "VPC_utilities.hh"
namespace blender::viewport_compositor {
using namespace nodes::derived_node_tree_types;
Evaluator::Evaluator(Context &context, bNodeTree &node_tree)
: context_(context), node_tree_(node_tree)
{
}
void Evaluator::evaluate()
{
/* Reset the texture pool that was potentially populated from a previous evaluation. */
context_.texture_pool().reset();
/* The node tree is not compiled yet, so compile and evaluate the node tree. */
if (!is_compiled_) {
compile_and_evaluate();
is_compiled_ = true;
return;
}
/* The node tree is already compiled, so just go over the operations stream and evaluate the
* operations in order. */
for (const std::unique_ptr<Operation> &operation : operations_stream_) {
operation->evaluate();
}
}
void Evaluator::reset()
{
/* Reset evaluator state. */
operations_stream_.clear();
derived_node_tree_.reset();
node_tree_reference_map_.clear();
/* Mark the node tree as in need to be compiled. */
is_compiled_ = false;
}
void Evaluator::compile_and_evaluate()
{
/* Construct and initialize a derived node tree from the compositor node tree. */
derived_node_tree_.reset(new DerivedNodeTree(node_tree_, node_tree_reference_map_));
/* Compute the node execution schedule. */
const Schedule schedule = compute_schedule(*derived_node_tree_);
/* Declare a compile state to use for tracking the state of the compilation. */
CompileState compile_state;
/* Go over the nodes in the schedule, compiling them into either node operations or GPU material
* operations. */
for (const DNode &node : schedule) {
/* Ask the compile state if now would be a good time to compile the GPU material compile group
* given the current node, and if it is, compile and evaluate it. */
if (compile_state.should_compile_gpu_material_compile_group(node)) {
compile_and_evaluate_gpu_material_compile_group(compile_state);
}
/* If the node is a GPU material node, then add it to the GPU material compile group. */
if (is_gpu_material_node(node)) {
compile_state.add_node_to_gpu_material_compile_group(node);
}
else {
/* Otherwise, compile and evaluate the node into a node operation. */
compile_and_evaluate_node(node, compile_state);
}
}
}
void Evaluator::compile_and_evaluate_node(DNode node, CompileState &compile_state)
{
/* Get an instance of the node's compositor operation. */
NodeOperation *operation = node->typeinfo()->get_compositor_operation(context_, node);
/* Map the node to the compiled operation. */
compile_state.map_node_to_node_operation(node, operation);
/* Map the inputs of the operation to the results of the outputs they are linked to. */
map_node_operation_inputs_to_their_results(node, operation, compile_state);
/* Add the operation to the operations stream. This has to be done after input mapping because
* the method may add Input Single Value Operations to the operations stream. */
operations_stream_.append(std::unique_ptr<Operation>(operation));
/* Evaluate the operation. */
operation->evaluate();
}
void Evaluator::map_node_operation_inputs_to_their_results(DNode node,
NodeOperation *operation,
CompileState &compile_state)
{
for (const InputSocketRef *input_ref : node->inputs()) {
const DInputSocket input{node.context(), input_ref};
/* Get the output linked to the input. */
const DOutputSocket output = get_output_linked_to_input(input);
/* The output is not null, which means the input is linked. So map the input to the result we
* get from the output. */
if (output) {
Result &result = compile_state.get_result_from_output_socket(output);
operation->map_input_to_result(input->identifier(), &result);
continue;
}
/* Otherwise, the output is null, which means the input is unlinked. So map the input to the
* result of a newly created Input Single Value Operation. */
InputSingleValueOperation *input_operation = new InputSingleValueOperation(context_, input);
operation->map_input_to_result(input->identifier(), &input_operation->get_result());
/* Add the input operation to the operations stream. */
operations_stream_.append(std::unique_ptr<InputSingleValueOperation>(input_operation));
/* Evaluate the input operation. */
input_operation->evaluate();
}
}
void Evaluator::compile_and_evaluate_gpu_material_compile_group(CompileState &compile_state)
{
/* Compile the GPU material compile group into a GPU Material Operation. */
SubSchedule &sub_schedule = compile_state.get_gpu_material_compile_group_sub_schedule();
GPUMaterialOperation *operation = new GPUMaterialOperation(context_, sub_schedule);
/* Map each of the nodes in the sub-schedule to the compiled operation. */
for (DNode node : sub_schedule) {
compile_state.map_node_to_gpu_material_operation(node, operation);
}
/* Map the inputs of the operation to the results of the outputs they are linked to. */
map_gpu_material_operation_inputs_to_their_results(operation, compile_state);
/* Add the operation to the operations stream. */
operations_stream_.append(std::unique_ptr<Operation>(operation));
/* Evaluate the operation. */
operation->evaluate();
/* Clear the GPU material compile group to ready it for tracking the next GPU material. */
compile_state.reset_gpu_material_compile_group();
}
void Evaluator::map_gpu_material_operation_inputs_to_their_results(GPUMaterialOperation *operation,
CompileState &compile_state)
{
InputIdentifierToOutputSocketMap &map = operation->get_input_identifier_to_output_socket_map();
/* For each input of the operation, retrieve the result of the output linked to it, and map the
* result to the input. */
for (const InputIdentifierToOutputSocketMap::Item &item : map.items()) {
/* Map the input to the result we got from the output. */
Result &result = compile_state.get_result_from_output_socket(item.value);
operation->map_input_to_result(item.key, &result);
}
}
} // namespace blender::viewport_compositor
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