update vcm::parse semantics

src/assets/assetload_funcs.cpp

@@ -381,8 +381,8 @@ assetload::postfunc assetload::model(
 
     auto text = io::read_string(path);
     try {
-        auto model = vcm::parse(path.string(), text, path.extension() == ".xml")
-                         .release();
+        auto vcmModel = vcm::parse(path.string(), text, path.extension() == ".xml");
+        auto model = std::make_unique<model::Model>(std::move(vcmModel.squash())).release();
         return [=](Assets* assets) {
             request_textures(loader, *model);
             assets->store(std::unique_ptr<model::Model>(model), name);

src/coders/vcm.cpp

@@ -2,7 +2,6 @@
 
 #include "xml.hpp"
 #include "util/stringutil.hpp"
-#include "objects/rigging.hpp"
 #include "io/io.hpp"
 
 #include <vector>
@@ -16,6 +15,45 @@ using namespace xml;
 using namespace model;
 using namespace rigging;
 
+static int calc_offsets(
+    const Bone& bone, std::vector<glm::vec3>& dst, int index, int depth, int parent
+) {
+    if (depth == 0) {
+        dst[0] = bone.getOffset();
+    } else {
+        dst[index] = dst[parent] + bone.getOffset();
+    }
+    const auto& subBones = bone.getSubnodes();
+
+    int subIndex = index + 1;
+    for (int i = 0; i < subBones.size(); i++) {
+        subIndex += calc_offsets(*subBones[i], dst, subIndex, depth + 1, index);
+    }
+    return subIndex - index;
+}
+
+model::Model& VcmModel::squash() {
+    std::vector<glm::vec3> fullOffsets(skeleton->getBones().size());
+    calc_offsets(*skeleton->getRoot(), fullOffsets, 0, 0, 0);
+
+    Model squashed;
+    for (auto& [name, model] : parts) {
+        if (auto bone = skeleton->find(name)) {
+            model.translate(fullOffsets[bone->getIndex()]);
+        } else {
+            throw std::runtime_error("invalid state: bones/parts mismatch");
+        }
+        squashed.merge(std::move(model));
+    }
+    parts = { {"", std::move(squashed)} };
+    skeleton.reset();
+    return parts.at("");
+}
+
+model::Model VcmModel::squashed() const {
+    return std::move(VcmModel {parts, std::nullopt}).squash();
+}
+
 static const std::unordered_map<std::string, int> side_indices {
     {"north", 0},
     {"south", 1},
@@ -376,13 +414,13 @@ static VcmModel load_model(const xmlelement& root) {
     }
 
     vcmModel.parts["root"] = std::move(model);
-    vcmModel.skeleton = std::make_unique<SkeletonConfig>(
+    vcmModel.skeleton = SkeletonConfig(
         "", std::make_unique<Bone>(std::move(rootBone)), boneIndex
     );
     return vcmModel;
 }
 
-VcmModel vcm::parseFull(
+VcmModel vcm::parse(
     std::string_view file, std::string_view src, bool usexml
 ) {
     try {
@@ -399,41 +437,3 @@ VcmModel vcm::parseFull(
         throw std::runtime_error(err.errorLog());
     }
 }
-
-static int calc_offsets(
-    const Bone& bone, std::vector<glm::vec3>& dst, int index, int depth, int parent
-) {
-    if (depth == 0) {
-        dst[0] = bone.getOffset();
-    } else {
-        dst[index] = dst[parent] + bone.getOffset();
-    }
-    const auto& subBones = bone.getSubnodes();
-
-    int subIndex = index + 1;
-    for (int i = 0; i < subBones.size(); i++) {
-        subIndex += calc_offsets(*subBones[i], dst, subIndex, depth + 1, index);
-    }
-    return subIndex - index;
-}
-
-std::unique_ptr<model::Model> vcm::parse(
-    std::string_view file, std::string_view src, bool usexml
-) {
-    auto vcmModel = parseFull(file, src, usexml);
-
-    std::vector<glm::vec3> fullOffsets(vcmModel.skeleton->getBones().size());
-    calc_offsets(*vcmModel.skeleton->getRoot(), fullOffsets, 0, 0, 0);
-
-    Model fullModel;
-    for (auto& [name, model] : vcmModel.parts) {
-        if (auto bone = vcmModel.skeleton->find(name)) {
-            model.translate(fullOffsets[bone->getIndex()]);
-        } else {
-            throw std::runtime_error("invalid state: bones/parts mismatch");
-        }
-        fullModel.merge(std::move(model));
-    }
-
-    return std::make_unique<Model>(std::move(fullModel));
-}

src/coders/vcm.hpp

@@ -2,9 +2,11 @@
 
 #include <memory>
 #include <string>
+#include <optional>
 #include <unordered_map>
 
 #include "graphics/commons/Model.hpp"
+#include "objects/rigging.hpp"
 
 namespace rigging {
     class SkeletonConfig;
@@ -13,14 +15,13 @@ namespace rigging {
 namespace vcm {
     struct VcmModel {
         std::unordered_map<std::string, model::Model> parts;
-        std::unique_ptr<rigging::SkeletonConfig> skeleton;
+        std::optional<rigging::SkeletonConfig> skeleton;
+
+        model::Model& squash();
+        model::Model squashed() const;
     };
 
-    VcmModel parseFull(
-        std::string_view file, std::string_view src, bool usexml
-    );
-
-    std::unique_ptr<model::Model> parse(
+    VcmModel parse(
         std::string_view file, std::string_view src, bool usexml
     );
 }

src/logic/scripting/lua/libs/libassets.cpp

@@ -57,11 +57,14 @@ static int l_parse_model(lua::State* L) {
     auto name = lua::require_string(L, 3);
     
     if (format == "xml" || format == "vcm") {
+        auto vcmModel = vcm::parse(name, string, format == "xml");
         engine->getAssets()->store(
-            vcm::parse(name, string, format == "xml"), name
+            std::make_unique<model::Model>(std::move(vcmModel.squash())), name
         );
     } else {
-        throw std::runtime_error("unknown format " + util::quote(std::string(format)));
+        throw std::runtime_error(
+            "unknown format " + util::quote(std::string(format))
+        );
     }
     return 0;
 }