Geometry Nodes: String to Curves Node

This commit adds a node that generates a text paragraph as curve
instances. The inputs on the node control the overall shape of the
paragraph, and other nodes can be used to move the individual instances
afterwards. To output more than one line, the "Special Characters" node
can be used.

The node outputs instances instead of real geometry so that it doesn't
have to duplicate work for every character afterwards. This is much
more efficient, because all of the curve evaluation and nodes like fill
curve don't have to repeat the same calculation for every instance of
the same character.

In the future, the instances component will support attributes, and the
node can output attribute fields like "Word Index" and "Line Index".

Differential Revision: https://developer.blender.org/D11522

4 files changed, 34 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
index 36c6b56caae..463bb02afa4 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
@@ -63,6 +63,7 @@
 #include "DNA_sound_types.h"
 #include "DNA_speaker_types.h"
 #include "DNA_texture_types.h"
+#include "DNA_vfont_types.h"
 #include "DNA_world_types.h"
 
 #include "BKE_action.h"
@@ -1764,6 +1765,9 @@ void DepsgraphNodeBuilder::build_nodetree(bNodeTree *ntree)
     else if (id_type == ID_MC) {
       build_movieclip((MovieClip *)id);
     }
+    else if (id_type == ID_VF) {
+      build_vfont((VFont *)id);
+    }
     else if (ELEM(bnode->type, NODE_GROUP, NODE_CUSTOM_GROUP)) {
       bNodeTree *group_ntree = (bNodeTree *)id;
       build_nodetree(group_ntree);
@@ -2015,6 +2019,17 @@ void DepsgraphNodeBuilder::build_simulation(Simulation *simulation)
                      });
 }
 
+void DepsgraphNodeBuilder::build_vfont(VFont *vfont)
+{
+  if (built_map_.checkIsBuiltAndTag(vfont)) {
+    return;
+  }
+  build_parameters(&vfont->id);
+  build_idproperties(vfont->id.properties);
+  add_operation_node(
+      &vfont->id, NodeType::GENERIC_DATABLOCK, OperationCode::GENERIC_DATABLOCK_UPDATE);
+}
+
 static bool seq_node_build_cb(Sequence *seq, void *user_data)
 {
   DepsgraphNodeBuilder *nb = (DepsgraphNodeBuilder *)user_data;
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
index 2378f3fc100..d31290ecbff 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
@@ -55,6 +55,7 @@ struct Scene;
 struct Simulation;
 struct Speaker;
 struct Tex;
+struct VFont;
 struct World;
 struct bAction;
 struct bArmature;
@@ -235,6 +236,7 @@ class DepsgraphNodeBuilder : public DepsgraphBuilder {
   virtual void build_scene_sequencer(Scene *scene);
   virtual void build_scene_audio(Scene *scene);
   virtual void build_scene_speakers(Scene *scene, ViewLayer *view_layer);
+  virtual void build_vfont(VFont *vfont);
 
   /* Per-ID information about what was already in the dependency graph.
    * Allows to re-use certain values, to speed up following evaluation. */
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
index 28cfc5a9e1a..55e8c5ed033 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
@@ -65,6 +65,7 @@
 #include "DNA_sound_types.h"
 #include "DNA_speaker_types.h"
 #include "DNA_texture_types.h"
+#include "DNA_vfont_types.h"
 #include "DNA_volume_types.h"
 #include "DNA_world_types.h"
 
@@ -2496,6 +2497,11 @@ void DepsgraphRelationBuilder::build_nodetree(bNodeTree *ntree)
       OperationKey clip_key(id, NodeType::PARAMETERS, OperationCode::MOVIECLIP_EVAL);
       add_relation(clip_key, shading_key, "Clip -> Node");
     }
+    else if (id_type == ID_VF) {
+      build_vfont((VFont *)id);
+      ComponentKey vfont_key(id, NodeType::GENERIC_DATABLOCK);
+      add_relation(vfont_key, shading_key, "VFont -> Node");
+    }
     else if (ELEM(bnode->type, NODE_GROUP, NODE_CUSTOM_GROUP)) {
       bNodeTree *group_ntree = (bNodeTree *)id;
       build_nodetree(group_ntree);
@@ -2842,6 +2848,15 @@ void DepsgraphRelationBuilder::build_scene_speakers(Scene * /*scene*/, ViewLayer
   }
 }
 
+void DepsgraphRelationBuilder::build_vfont(VFont *vfont)
+{
+  if (built_map_.checkIsBuiltAndTag(vfont)) {
+    return;
+  }
+  build_parameters(&vfont->id);
+  build_idproperties(vfont->id.properties);
+}
+
 void DepsgraphRelationBuilder::build_copy_on_write_relations()
 {
   for (IDNode *id_node : graph_->id_nodes) {
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.h b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
index 1ad61c25305..f0393544511 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
@@ -72,6 +72,7 @@ struct Simulation;
 struct Speaker;
 struct Tex;
 struct ViewLayer;
+struct VFont;
 struct World;
 struct bAction;
 struct bArmature;
@@ -296,6 +297,7 @@ class DepsgraphRelationBuilder : public DepsgraphBuilder {
   virtual void build_scene_sequencer(Scene *scene);
   virtual void build_scene_audio(Scene *scene);
   virtual void build_scene_speakers(Scene *scene, ViewLayer *view_layer);
+  virtual void build_vfont(VFont *vfont);
 
   virtual void build_nested_datablock(ID *owner, ID *id);
   virtual void build_nested_nodetree(ID *owner, bNodeTree *ntree);