Tweaks to asset sharing to support Unreal implementation

CesiumGltf/include/CesiumGltf/VertexAttributeSemantics.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <array>
+#include <string>
+
+namespace CesiumGltf {
+
+/**
+ * @brief The standard glTF vertex attribute semantics from the specification.
+ */
+struct VertexAttributeSemantics {
+  /**
+   * @brief Unitless XYZ vertex positions.
+   */
+  static const std::string POSITION;
+
+  /**
+   * @brief Normalized XYZ vertex normals.
+   */
+  static const std::string NORMAL;
+
+  /**
+   * @brief XYZW vertex tangents where the XYZ portion is normalized, and the W
+   * component is a sign value (-1 or +1) indicating handedness of the tangent
+   * basis.
+   */
+  static const std::string TANGENT;
+
+  /**
+   * @brief ST texture coordinates
+   */
+  static const std::array<std::string, 8> TEXCOORD_n;
+
+  /**
+   * @brief RGB or RGBA vertex color linear multiplier.
+   */
+  static const std::array<std::string, 8> COLOR_n;
+
+  /**
+   * @brief The indices of the joints from the corresponding skin.joints array
+   * that affect the vertex.
+   */
+  static const std::array<std::string, 8> JOINTS_n;
+
+  /**
+   * @brief The weights indicating how strongly the joint influences the vertex.
+   */
+  static const std::array<std::string, 8> WEIGHTS_n;
+};
+
+} // namespace CesiumGltf

CesiumGltf/src/VertexAttributeSemantics.cpp

@@ -0,0 +1,75 @@
+#include <CesiumGltf/VertexAttributeSemantics.h>
+
+namespace CesiumGltf {
+
+/**
+ * @brief Unitless XYZ vertex positions.
+ */
+const std::string VertexAttributeSemantics::POSITION = "POSITION";
+
+/**
+ * @brief Normalized XYZ vertex normals.
+ */
+const std::string VertexAttributeSemantics::NORMAL = "NORMAL";
+
+/**
+ * @brief XYZW vertex tangents where the XYZ portion is normalized, and the W
+ * component is a sign value (-1 or +1) indicating handedness of the tangent
+ * basis.
+ */
+const std::string VertexAttributeSemantics::TANGENT = "TANGENT";
+
+/**
+ * @brief ST texture coordinates
+ */
+const std::array<std::string, 8> VertexAttributeSemantics::TEXCOORD_n = {
+    "TEXCOORD_0",
+    "TEXCOORD_1",
+    "TEXCOORD_2",
+    "TEXCOORD_3",
+    "TEXCOORD_4",
+    "TEXCOORD_5",
+    "TEXCOORD_6",
+    "TEXCOORD_7"};
+
+/**
+ * @brief RGB or RGBA vertex color linear multiplier.
+ */
+const std::array<std::string, 8> VertexAttributeSemantics::COLOR_n = {
+    "COLOR_0",
+    "COLOR_1",
+    "COLOR_2",
+    "COLOR_3",
+    "COLOR_4",
+    "COLOR_5",
+    "COLOR_6",
+    "COLOR_7"};
+
+/**
+ * @brief The indices of the joints from the corresponding skin.joints array
+ * that affect the vertex.
+ */
+const std::array<std::string, 8> VertexAttributeSemantics::JOINTS_n = {
+    "JOINTS_0",
+    "JOINTS_1",
+    "JOINTS_2",
+    "JOINTS_3",
+    "JOINTS_4",
+    "JOINTS_5",
+    "JOINTS_6",
+    "JOINTS_7"};
+
+/**
+ * @brief The weights indicating how strongly the joint influences the vertex.
+ */
+const std::array<std::string, 8> VertexAttributeSemantics::WEIGHTS_n = {
+    "WEIGHTS_0",
+    "WEIGHTS_1",
+    "WEIGHTS_2",
+    "WEIGHTS_3",
+    "WEIGHTS_4",
+    "WEIGHTS_5",
+    "WEIGHTS_6",
+    "WEIGHTS_7"};
+
+} // namespace CesiumGltf

CesiumUtility/include/CesiumUtility/ExtensibleObject.h

@@ -70,9 +70,14 @@ struct CESIUMUTILITY_API ExtensibleObject {
    * @tparam T The type of the extension to add.
    * @return The added extension.
    */
-  template <typename T> T& addExtension() {
+  template <typename T, typename... ConstructorArgumentTypes>
+  T& addExtension(ConstructorArgumentTypes&&... constructorArguments) {
     std::any& extension =
-        extensions.try_emplace(T::ExtensionName, std::make_any<T>())
+        extensions
+            .try_emplace(
+                T::ExtensionName,
+                std::make_any<T>(std::forward<ConstructorArgumentTypes>(
+                    constructorArguments)...))
             .first->second;
     return std::any_cast<T&>(extension);
   }