Add FEATURE_ID_n semantic and InstanceAttributeSemantics

CesiumGltf/include/CesiumGltf/InstanceAttributeSemantics.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <array>
+#include <string>
+
+namespace CesiumGltf {
+
+/**
+ * @brief The standard glTF instance attribute semantics from
+ * `EXT_mesh_gpu_instancing` plus additional instance attribute semantics from
+ * extensions.
+ */
+struct InstanceAttributeSemantics {
+  /**
+   * @brief XYZ translation vector.
+   */
+  static const std::string TRANSLATION;
+
+  /**
+   * @brief XYZW rotation quaternion.
+   */
+  static const std::string ROTATION;
+
+  /**
+   * @brief XYZ scale vector.
+   */
+  static const std::string SCALE;
+
+  /**
+   * @brief Feature IDs used in `EXT_instance_features`.
+   */
+  static const std::array<std::string, 8> FEATURE_ID_n;
+};
+
+} // namespace CesiumGltf

CesiumGltf/include/CesiumGltf/VertexAttributeSemantics.h

@@ -6,7 +6,8 @@
 namespace CesiumGltf {
 
 /**
- * @brief The standard glTF vertex attribute semantics from the specification.
+ * @brief The standard glTF vertex attribute semantics from the specification
+ * plus additional vertex attribute semantics from extensions.
  */
 struct VertexAttributeSemantics {
   /**
@@ -46,6 +47,11 @@ struct VertexAttributeSemantics {
    * @brief The weights indicating how strongly the joint influences the vertex.
    */
   static const std::array<std::string, 8> WEIGHTS_n;
+
+  /**
+   * @brief Feature IDs used in `EXT_mesh_features`.
+   */
+  static const std::array<std::string, 8> FEATURE_ID_n;
 };
 
 } // namespace CesiumGltf

CesiumGltf/src/InstanceAttributeSemantics.cpp

@@ -0,0 +1,33 @@
+#include <CesiumGltf/InstanceAttributeSemantics.h>
+
+namespace CesiumGltf {
+
+/**
+ * @brief XYZ translation vector.
+ */
+const std::string InstanceAttributeSemantics::TRANSLATION = "TRANSLATION";
+
+/**
+ * @brief XYZW rotation quaternion.
+ */
+const std::string InstanceAttributeSemantics::ROTATION = "ROTATION";
+
+/**
+ * @brief XYZ scale vector.
+ */
+const std::string InstanceAttributeSemantics::SCALE = "SCALE";
+
+/**
+ * @brief Feature IDs used in `EXT_mesh_features`.
+ */
+const std::array<std::string, 8> InstanceAttributeSemantics::FEATURE_ID_n = {
+    "_FEATURE_ID_0",
+    "_FEATURE_ID_1",
+    "_FEATURE_ID_2",
+    "_FEATURE_ID_3",
+    "_FEATURE_ID_4",
+    "_FEATURE_ID_5",
+    "_FEATURE_ID_6",
+    "_FEATURE_ID_7"};
+
+} // namespace CesiumGltf

CesiumGltf/src/VertexAttributeSemantics.cpp

@@ -72,4 +72,17 @@ const std::array<std::string, 8> VertexAttributeSemantics::WEIGHTS_n = {
     "WEIGHTS_6",
     "WEIGHTS_7"};
 
+/**
+ * @brief Feature IDs used in `EXT_mesh_features`.
+ */
+const std::array<std::string, 8> VertexAttributeSemantics::FEATURE_ID_n = {
+    "_FEATURE_ID_0",
+    "_FEATURE_ID_1",
+    "_FEATURE_ID_2",
+    "_FEATURE_ID_3",
+    "_FEATURE_ID_4",
+    "_FEATURE_ID_5",
+    "_FEATURE_ID_6",
+    "_FEATURE_ID_7"};
+
 } // namespace CesiumGltf