feat(assets): add identifying assets in code from their path

engine/include/cubos/engine/assets/asset.hpp

@@ -12,6 +12,14 @@
 
 namespace cubos::engine
 {
+    /// @brief Type of the asset identifier.
+    enum class IdType
+    {
+        UUID,
+        Path,
+        Invalid
+    };
+
     template <typename T>
     class Asset;
 
@@ -71,11 +79,22 @@ namespace cubos::engine
         /// @return Asset version.
         int getVersion() const;
 
+        /// @brief Gets the type of the asset identifier.
+        /// @return Asset identifier type.
+        IdType getIdType() const;
+
         /// @brief Gets the Path or UUID of the asset.
         /// @return Asset Path or UUID.
         std::string getIdString() const;
 
-        /// @brief Gets the UUID of the asset if it is the case of having one.
+        /// @brief Gets the UUID of the asset if it has one.
+        ///
+        /// There are two possible reasons for an asset handle to have no UUID:
+        /// - it being an invalid or null handle;
+        /// - it being created from an asset path.
+        ///
+        /// To ensure an asset handle gets a UUID, you can use @ref Assets::load.
+        ///
         /// @return Asset UUID.
         std::optional<uuids::uuid> getId() const;
 

engine/include/cubos/engine/assets/assets.hpp

@@ -356,11 +356,6 @@ namespace cubos::engine
         /// @return Lock guard.
         std::unique_lock<std::shared_mutex> lockWrite(const AnyAsset& handle) const;
 
-        /// @brief Checks if the given path is a valid path to an asset.
-        /// @param path Path to check.
-        /// @return A string that says if the given string is a path, uuid or not a valid format string
-        static std::string isPath(const std::string& path);
-
         /// @brief Gets a pointer to the entry associated with the given handle.
         /// @param handle Handle to get the entry for.
         /// @return Entry for the given handle, or nullptr if there is no such entry.

engine/include/cubos/engine/assets/meta.hpp

@@ -52,7 +52,7 @@ namespace cubos::engine
 
         /// @brief Gets the path of the asset.
         /// @return Path of the asset.
-        std::string getPath() const;
+        std::optional<std::string> getPath() const;
 
         /// @brief Sets a parameter on the asset's metadata.
         /// @param key Key of the parameter.

engine/src/assets/asset.cpp

@@ -43,13 +43,13 @@ AnyAsset::AnyAsset(std::string_view str)
         pathOrId = str;
         mId = id.value();
     }
-    else if (str.find('/') != std::string_view::npos || str.find('\\') != std::string_view::npos)
+    else if (!str.empty() && str[0] == '/')
     {
         pathOrId = str;
     }
     else
     {
-        CUBOS_ERROR("Could not create asset handle, invalid UUID: \"{}\"", str);
+        CUBOS_ERROR("Could not create asset handle, invalid path or UUID: \"{}\"", str);
     }
 }
 
@@ -113,6 +113,19 @@ int AnyAsset::getVersion() const
     return getId().has_value() && getId().value() == mId ? mVersion : 0;
 }
 
+IdType AnyAsset::getIdType() const
+{
+    if (!pathOrId.empty() && pathOrId[0] == '/')
+    {
+        return IdType::Path;
+    }
+    else if (auto id = uuids::uuid::from_string(pathOrId))
+    {
+        return IdType::UUID;
+    }
+    return IdType::Invalid;
+}
+
 std::string AnyAsset::getIdString() const
 {
     return pathOrId;

engine/src/assets/assets.cpp

@@ -597,18 +597,6 @@ std::unique_lock<std::shared_mutex> Assets::lockWrite(const AnyAsset& handle) co
     abort();
 }
 
-std::string Assets::isPath(const std::string& path)
-{
-    if (path.find('/') != std::string::npos || path.find('\\') != std::string::npos)
-    {
-        return "Path";
-    }
-    else if (auto id = uuids::uuid::from_string(path))
-    {
-        return "UUID";
-    }
-    return "Invalid format";
-}
 std::shared_ptr<Assets::Entry> Assets::entry(const AnyAsset& handle) const
 {
     // If the handle is null, we can't access the asset.
@@ -622,8 +610,9 @@ std::shared_ptr<Assets::Entry> Assets::entry(const AnyAsset& handle) const
     auto sharedLock = std::shared_lock(mMutex);
 
     auto sid = handle.getIdString();
+    auto type = handle.getIdType();
 
-    if (isPath(sid) == "Path")
+    if (type == IdType::Path)
     {
         for (const auto& [eid, entry] : mEntries)
         {
@@ -635,7 +624,7 @@ std::shared_ptr<Assets::Entry> Assets::entry(const AnyAsset& handle) const
         CUBOS_ERROR("No such asset {}", handle);
         return nullptr;
     }
-    if (isPath(sid) == "UUID")
+    if (type == IdType::UUID)
     {
         // Search for the entry in the map.
         auto it = mEntries.find(handle.getId().value());
@@ -673,8 +662,8 @@ std::shared_ptr<Assets::Entry> Assets::entry(const AnyAsset& handle, bool create
     }
 
     auto sid = handle.getIdString();
-
-    if (isPath(sid) == "Path")
+    auto type = handle.getIdType();
+    if (type == IdType::Path)
     {
         for (const auto& [eid, entry] : mEntries)
         {
@@ -697,9 +686,8 @@ std::shared_ptr<Assets::Entry> Assets::entry(const AnyAsset& handle, bool create
         CUBOS_ERROR("No such asset {}", handle);
         return nullptr;
     }
-    if (isPath(sid) == "UUID")
+    else if (type == IdType::UUID)
     {
-
         // Search for an existing entry for the asset.
         auto it = mEntries.find(handle.getId().value());
         if (it == mEntries.end())

engine/src/assets/meta.cpp

@@ -27,11 +27,7 @@ uuids::uuid AssetMeta::getId() const
     return uuids::uuid::from_string(this->get("id").value()).value();
 }
 
-std::string AssetMeta::getPath() const
+std::optional<std::string> AssetMeta::getPath() const
 {
-    if (auto path = this->get("path"))
-    {
-        return path.value();
-    }
-    return {};
+    return this->get("path");
 }

engine/src/render/mesh/plugin.cpp

@@ -79,16 +79,16 @@ void cubos::engine::renderMeshPlugin(Cubos& cubos)
 
     cubos.observer("update RenderMesh on LoadRenderVoxels")
         .onAdd<LoadRenderVoxels>()
-        .call([](Commands cmds, State& state, Assets& assets, Query<Entity, const RenderVoxelGrid&> query) {
+        .call([](Commands cmds, State& state, Assets& assets, Query<Entity, RenderVoxelGrid&> query) {
             for (auto [ent, grid] : query)
             {
                 if (grid.asset.isNull())
                 {
                     continue;
                 }
 
-                // If not loaded, the mId might be a nil UUID, so we need to load the asset first.
-                assets.load(grid.asset);
+                // The asset handle might not yet have a valid ID, and since we need getId, we load it first.
+                grid.asset = assets.load(grid.asset);
                 // If the asset has never been loaded, or it has been updated since the last meshing, update the entry
                 // and queue a meshing task. Otherwise, just reuse the existing mesh.
                 auto& entry = state.entries[grid.asset.getId().value()];