Geometry Nodes: new evaluation system

This refactors the geometry nodes evaluation system. No changes for the
user are expected. At a high level the goals are:
* Support using geometry nodes outside of the geometry nodes modifier.
* Support using the evaluator infrastructure for other purposes like field evaluation.
* Support more nodes, especially when many of them are disabled behind switch nodes.
* Support doing preprocessing on node groups.

For more details see T98492.

There are fairly detailed comments in the code, but here is a high level overview
for how it works now:
* There is a new "lazy-function" system. It is similar in spirit to the multi-function
  system but with different goals. Instead of optimizing throughput for highly
  parallelizable work, this system is designed to compute only the data that is actually
  necessary. What data is necessary can be determined dynamically during evaluation.
  Many lazy-functions can be composed in a graph to form a new lazy-function, which can
  again be used in a graph etc.
* Each geometry node group is converted into a lazy-function graph prior to evaluation.
  To evaluate geometry nodes, one then just has to evaluate that graph. Node groups are
  no longer inlined into their parents.

Next steps for the evaluation system is to reduce the use of threads in some situations
to avoid overhead. Many small node groups don't benefit from multi-threading at all.
This is much easier to do now because not everything has to be inlined in one huge
node tree anymore.

Differential Revision: https://developer.blender.org/D15914

1 files changed, 16 insertions, 29 deletions

diff --git a/source/blender/nodes/intern/node_geometry_exec.cc b/source/blender/nodes/intern/node_geometry_exec.cc
index 953dce035c2..1833774fe33 100644
--- a/source/blender/nodes/intern/node_geometry_exec.cc
+++ b/source/blender/nodes/intern/node_geometry_exec.cc
@@ -11,34 +11,27 @@
 
 #include "node_geometry_util.hh"
 
-using blender::nodes::geometry_nodes_eval_log::LocalGeoLogger;
-
 namespace blender::nodes {
 
 void GeoNodeExecParams::error_message_add(const NodeWarningType type, std::string message) const
 {
-  if (provider_->logger == nullptr) {
-    return;
+  if (geo_eval_log::GeoTreeLogger *tree_logger = this->get_local_tree_logger()) {
+    tree_logger->node_warnings.append({node_.name, {type, std::move(message)}});
   }
-  LocalGeoLogger &local_logger = provider_->logger->local();
-  local_logger.log_node_warning(provider_->dnode, type, std::move(message));
 }
 
 void GeoNodeExecParams::used_named_attribute(std::string attribute_name,
-                                             const eNamedAttrUsage usage)
+                                             const NamedAttributeUsage usage)
 {
-  if (provider_->logger == nullptr) {
-    return;
+  if (geo_eval_log::GeoTreeLogger *tree_logger = this->get_local_tree_logger()) {
+    tree_logger->used_named_attributes.append({node_.name, std::move(attribute_name), usage});
   }
-  LocalGeoLogger &local_logger = provider_->logger->local();
-  local_logger.log_used_named_attribute(provider_->dnode, std::move(attribute_name), usage);
 }
 
 void GeoNodeExecParams::check_input_geometry_set(StringRef identifier,
                                                  const GeometrySet &geometry_set) const
 {
-  const SocketDeclaration &decl =
-      *provider_->dnode->input_by_identifier(identifier).runtime->declaration;
+  const SocketDeclaration &decl = *node_.input_by_identifier(identifier).runtime->declaration;
   const decl::Geometry *geo_decl = dynamic_cast<const decl::Geometry *>(&decl);
   if (geo_decl == nullptr) {
     return;
@@ -118,7 +111,7 @@ void GeoNodeExecParams::check_output_geometry_set(const GeometrySet &geometry_se
 
 const bNodeSocket *GeoNodeExecParams::find_available_socket(const StringRef name) const
 {
-  for (const bNodeSocket *socket : provider_->dnode->runtime->inputs) {
+  for (const bNodeSocket *socket : node_.input_sockets()) {
     if (socket->is_available() && socket->name == name) {
       return socket;
     }
@@ -129,19 +122,19 @@ const bNodeSocket *GeoNodeExecParams::find_available_socket(const StringRef name
 
 std::string GeoNodeExecParams::attribute_producer_name() const
 {
-  return provider_->dnode->label_or_name() + TIP_(" node");
+  return node_.label_or_name() + TIP_(" node");
 }
 
 void GeoNodeExecParams::set_default_remaining_outputs()
 {
-  provider_->set_default_remaining_outputs();
+  params_.set_default_remaining_outputs();
 }
 
 void GeoNodeExecParams::check_input_access(StringRef identifier,
                                            const CPPType *requested_type) const
 {
   const bNodeSocket *found_socket = nullptr;
-  for (const bNodeSocket *socket : provider_->dnode->input_sockets()) {
+  for (const bNodeSocket *socket : node_.input_sockets()) {
     if (socket->identifier == identifier) {
       found_socket = socket;
       break;
@@ -151,7 +144,7 @@ void GeoNodeExecParams::check_input_access(StringRef identifier,
   if (found_socket == nullptr) {
     std::cout << "Did not find an input socket with the identifier '" << identifier << "'.\n";
     std::cout << "Possible identifiers are: ";
-    for (const bNodeSocket *socket : provider_->dnode->input_sockets()) {
+    for (const bNodeSocket *socket : node_.input_sockets()) {
       if (socket->is_available()) {
         std::cout << "'" << socket->identifier << "', ";
       }
@@ -164,13 +157,7 @@ void GeoNodeExecParams::check_input_access(StringRef identifier,
               << "' is disabled.\n";
     BLI_assert_unreachable();
   }
-  else if (!provider_->can_get_input(identifier)) {
-    std::cout << "The identifier '" << identifier
-              << "' is valid, but there is no value for it anymore.\n";
-    std::cout << "Most likely it has been extracted before.\n";
-    BLI_assert_unreachable();
-  }
-  else if (requested_type != nullptr) {
+  else if (requested_type != nullptr && (found_socket->flag & SOCK_MULTI_INPUT) == 0) {
     const CPPType &expected_type = *found_socket->typeinfo->geometry_nodes_cpp_type;
     if (*requested_type != expected_type) {
       std::cout << "The requested type '" << requested_type->name() << "' is incorrect. Expected '"
@@ -183,7 +170,7 @@ void GeoNodeExecParams::check_input_access(StringRef identifier,
 void GeoNodeExecParams::check_output_access(StringRef identifier, const CPPType &value_type) const
 {
   const bNodeSocket *found_socket = nullptr;
-  for (const bNodeSocket *socket : provider_->dnode->output_sockets()) {
+  for (const bNodeSocket *socket : node_.output_sockets()) {
     if (socket->identifier == identifier) {
       found_socket = socket;
       break;
@@ -193,8 +180,8 @@ void GeoNodeExecParams::check_output_access(StringRef identifier, const CPPType
   if (found_socket == nullptr) {
     std::cout << "Did not find an output socket with the identifier '" << identifier << "'.\n";
     std::cout << "Possible identifiers are: ";
-    for (const bNodeSocket *socket : provider_->dnode->output_sockets()) {
-      if (!(socket->flag & SOCK_UNAVAIL)) {
+    for (const bNodeSocket *socket : node_.output_sockets()) {
+      if (socket->is_available()) {
         std::cout << "'" << socket->identifier << "', ";
       }
     }
@@ -206,7 +193,7 @@ void GeoNodeExecParams::check_output_access(StringRef identifier, const CPPType
               << "' is disabled.\n";
     BLI_assert_unreachable();
   }
-  else if (!provider_->can_set_output(identifier)) {
+  else if (params_.output_was_set(this->get_output_index(identifier))) {
     std::cout << "The identifier '" << identifier << "' has been set already.\n";
     BLI_assert_unreachable();
   }