Support 3D Tile I3dm legacy tile format

CHANGES.md

@@ -40,6 +40,7 @@
 - Added `getNodeTransform`, `setNodeTransform`, `removeUnusedTextures`, `removeUnusedSamplers`, `removeUnusedImages`, `removeUnusedAccessors`, `removeUnusedBufferViews`, and `compactBuffers` methods to `GltfUtilities`.
 - Added `postprocessGltf` method to `GltfReader`.
 - `Model::merge` now merges the `EXT_structural_metadata` and `EXT_mesh_features` extensions. It also now returns an `ErrorList`, used to report warnings and errors about the merge process.
+- Added support for I3dm 3D Tile content files.
 
 ##### Fixes :wrench:
 

CMakeLists.txt

@@ -36,8 +36,8 @@ if (NOT DEFINED GLOB_USE_CONFIGURE_DEPENDS)
     )
 endif()
 
-set(CESIUM_DEBUG_POSTFIX "d")
-set(CESIUM_RELEASE_POSTFIX "")
+set(CESIUM_DEBUG_POSTFIX "d" CACHE STRING "debug postfix for cesium native")
+set(CESIUM_RELEASE_POSTFIX "" CACHE STRING "release postfix for cesium native")
 
 set(CMAKE_DEBUG_POSTFIX ${CESIUM_DEBUG_POSTFIX})
 set(CMAKE_RELEASE_POSTFIX ${CESIUM_RELEASE_POSTFIX})
@@ -137,8 +137,8 @@ endfunction()
 add_subdirectory(extern EXCLUDE_FROM_ALL)
 
 # These libraries override the debug postfix, so re-override it.
-set_target_properties(spdlog PROPERTIES DEBUG_POSTFIX ${CESIUM_DEBUG_POSTFIX})
-set_target_properties(tinyxml2 PROPERTIES DEBUG_POSTFIX ${CESIUM_DEBUG_POSTFIX})
+set_target_properties(spdlog PROPERTIES DEBUG_POSTFIX "${CESIUM_DEBUG_POSTFIX}")
+set_target_properties(tinyxml2 PROPERTIES DEBUG_POSTFIX "${CESIUM_DEBUG_POSTFIX}")
 
 # Public Targets
 add_subdirectory(CesiumUtility)

Cesium3DTilesContent/include/Cesium3DTilesContent/B3dmToGltfConverter.h

@@ -2,6 +2,7 @@
 
 #include "GltfConverterResult.h"
 
+#include <CesiumAsync/Future.h>
 #include <CesiumGltf/Model.h>
 #include <CesiumGltfReader/GltfReader.h>
 
@@ -10,9 +11,12 @@
 #include <optional>
 
 namespace Cesium3DTilesContent {
+struct AssetFetcher;
+
 struct B3dmToGltfConverter {
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const gsl::span<const std::byte>& b3dmBinary,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 };
 } // namespace Cesium3DTilesContent

Cesium3DTilesContent/include/Cesium3DTilesContent/BinaryToGltfConverter.h

@@ -1,20 +1,27 @@
 #pragma once
 
 #include <Cesium3DTilesContent/GltfConverterResult.h>
+#include <CesiumAsync/Future.h>
 #include <CesiumGltfReader/GltfReader.h>
 
 #include <gsl/span>
 
 #include <cstddef>
 
 namespace Cesium3DTilesContent {
+struct AssetFetcher;
+
 struct BinaryToGltfConverter {
 public:
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const gsl::span<const std::byte>& gltfBinary,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 
 private:
+  static GltfConverterResult convertImmediate(
+      const gsl::span<const std::byte>& gltfBinary,
+      const CesiumGltfReader::GltfReaderOptions& options);
   static CesiumGltfReader::GltfReader _gltfReader;
 };
 } // namespace Cesium3DTilesContent

Cesium3DTilesContent/include/Cesium3DTilesContent/CmptToGltfConverter.h

@@ -1,16 +1,20 @@
 #pragma once
 
 #include <Cesium3DTilesContent/GltfConverterResult.h>
+#include <CesiumAsync/Future.h>
 #include <CesiumGltfReader/GltfReader.h>
 
 #include <gsl/span>
 
 #include <cstddef>
 
 namespace Cesium3DTilesContent {
+struct AssetFetcher;
+
 struct CmptToGltfConverter {
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const gsl::span<const std::byte>& cmptBinary,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 };
 } // namespace Cesium3DTilesContent

Cesium3DTilesContent/include/Cesium3DTilesContent/GltfConverterResult.h

@@ -5,7 +5,12 @@
 #include <CesiumGltf/Model.h>
 #include <CesiumUtility/ErrorList.h>
 
+#include <glm/common.hpp>
+#include <glm/gtx/quaternion.hpp>
+
 #include <optional>
+#include <string>
+#include <vector>
 
 namespace Cesium3DTilesContent {
 /**

Cesium3DTilesContent/include/Cesium3DTilesContent/GltfConverterUtility.h

@@ -0,0 +1,132 @@
+#pragma once
+
+#include <Cesium3DTilesContent/GltfConverters.h>
+#include <CesiumAsync/IAssetAccessor.h>
+#include <CesiumAsync/IAssetRequest.h>
+#include <CesiumGltf/AccessorView.h>
+#include <CesiumGltf/PropertyTransformations.h>
+#include <CesiumUtility/ErrorList.h>
+
+#include <glm/fwd.hpp>
+#include <rapidjson/document.h>
+
+#include <cstdint>
+#include <optional>
+#include <vector>
+
+namespace CesiumGltf {
+class Model;
+class Buffer;
+} // namespace CesiumGltf
+
+namespace Cesium3DTilesContent {
+
+namespace GltfConverterUtility {
+std::optional<uint32_t> parseOffsetForSemantic(
+    const rapidjson::Document& document,
+    const char* semantic,
+    CesiumUtility::ErrorList& errorList);
+
+typedef bool (rapidjson::Value::*ValuePredicate)() const;
+
+template <typename T> bool isValue(const rapidjson::Value& value);
+template <typename T> T getValue(const rapidjson::Value& value);
+
+template <typename T>
+std::optional<T> getOptional(const rapidjson::Value& value) {
+  if (isValue<T>(value)) {
+    return std::make_optional(getValue<T>(value));
+  }
+  return {};
+}
+
+template <typename T>
+std::optional<T>
+getValue(const rapidjson::Document& document, const char* semantic) {
+  const auto valueIt = document.FindMember(semantic);
+  if (valueIt == document.MemberEnd() || !isValue<T>(valueIt->value)) {
+    return {};
+  }
+  return std::make_optional(getValue<T>(valueIt->value));
+}
+
+template <> inline bool isValue<bool>(const rapidjson::Value& value) {
+  return value.IsBool();
+}
+
+template <> inline bool getValue<bool>(const rapidjson::Value& value) {
+  return value.GetBool();
+}
+
+template <> inline bool isValue<uint32_t>(const rapidjson::Value& value) {
+  return value.IsUint();
+}
+
+template <> inline uint32_t getValue<uint32_t>(const rapidjson::Value& value) {
+  return value.GetUint();
+}
+
+bool validateJsonArrayValues(
+    const rapidjson::Value& arrayValue,
+    uint32_t expectedLength,
+    ValuePredicate predicate);
+
+std::optional<glm::dvec3>
+parseArrayValueDVec3(const rapidjson::Value& arrayValue);
+
+std::optional<glm::dvec3>
+parseArrayValueDVec3(const rapidjson::Document& document, const char* name);
+
+int32_t
+createBufferInGltf(CesiumGltf::Model& gltf, std::vector<std::byte> buffer = {});
+
+int32_t createBufferViewInGltf(
+    CesiumGltf::Model& gltf,
+    const int32_t bufferId,
+    const int64_t byteLength,
+    const int64_t byteStride);
+
+int32_t createAccessorInGltf(
+    CesiumGltf::Model& gltf,
+    const int32_t bufferViewId,
+    const int32_t componentType,
+    const int64_t count,
+    const std::string type);
+
+/**
+ * Applies the given relative-to-center (RTC) translation to the transforms of
+ * all nodes in the glTF. This is useful in converting i3dm files, where the RTC
+ * translation must be applied to the model before the i3dm instance
+ * transform. It's also the 3D Tiles 1.1 "way" to do away with RTC and encode it
+ * directly in the glTF.
+ */
+void applyRtcToNodes(CesiumGltf::Model& gltf, const glm::dvec3& rtc);
+
+template <typename GlmType, typename GLTFType>
+GlmType toGlm(const GLTFType& gltfVal);
+
+template <typename GlmType, typename ComponentType>
+GlmType toGlm(const CesiumGltf::AccessorTypes::VEC3<ComponentType>& gltfVal) {
+  return GlmType(gltfVal.value[0], gltfVal.value[1], gltfVal.value[2]);
+}
+
+template <typename GlmType, typename ComponentType>
+GlmType
+toGlmQuat(const CesiumGltf::AccessorTypes::VEC4<ComponentType>& gltfVal) {
+  if constexpr (std::is_same<ComponentType, float>()) {
+    return GlmType(
+        gltfVal.value[3],
+        gltfVal.value[0],
+        gltfVal.value[1],
+        gltfVal.value[2]);
+  } else {
+    return GlmType(
+        CesiumGltf::normalize(gltfVal.value[3]),
+        CesiumGltf::normalize(gltfVal.value[0]),
+        CesiumGltf::normalize(gltfVal.value[1]),
+        CesiumGltf::normalize(gltfVal.value[2]));
+  }
+}
+
+} // namespace GltfConverterUtility
+} // namespace Cesium3DTilesContent

Cesium3DTilesContent/include/Cesium3DTilesContent/GltfConverters.h

@@ -3,6 +3,8 @@
 #include "Library.h"
 
 #include <Cesium3DTilesContent/GltfConverterResult.h>
+#include <CesiumAsync/Future.h>
+#include <CesiumAsync/IAssetAccessor.h>
 #include <CesiumGltfReader/GltfReader.h>
 
 #include <gsl/span>
@@ -12,6 +14,39 @@
 #include <string_view>
 
 namespace Cesium3DTilesContent {
+
+struct AssetFetcherResult {
+  std::vector<std::byte> bytes;
+  CesiumUtility::ErrorList errorList;
+};
+
+/**
+ * Object that makes a recursive request to fetch an asset, mostly for the
+ * benefit of i3dm files.
+ */
+struct CESIUM3DTILESCONTENT_API AssetFetcher {
+  AssetFetcher(
+      const CesiumAsync::AsyncSystem& asyncSystem_,
+      const std::shared_ptr<CesiumAsync::IAssetAccessor>& pAssetAccessor_,
+      const std::string& baseUrl_,
+      const glm::dmat4 tileTransform_,
+      const std::vector<CesiumAsync::IAssetAccessor::THeader>& requestHeaders_)
+      : asyncSystem(asyncSystem_),
+        pAssetAccessor(pAssetAccessor_),
+        baseUrl(baseUrl_),
+        tileTransform(tileTransform_),
+        requestHeaders(requestHeaders_) {}
+
+  CesiumAsync::Future<AssetFetcherResult>
+  get(const std::string& relativeUrl) const;
+
+  const CesiumAsync::AsyncSystem& asyncSystem;
+  const std::shared_ptr<CesiumAsync::IAssetAccessor> pAssetAccessor;
+  const std::string baseUrl;
+  glm::dmat4 tileTransform; // For ENU transforms in i3dm
+  const std::vector<CesiumAsync::IAssetAccessor::THeader>& requestHeaders;
+};
+
 /**
  * @brief Creates {@link GltfConverterResult} objects from a
  * a binary content.
@@ -32,9 +67,10 @@ class CESIUM3DTILESCONTENT_API GltfConverters {
    * @brief A function pointer that can create a {@link GltfConverterResult} from a
    * tile binary content.
    */
-  using ConverterFunction = GltfConverterResult (*)(
+  using ConverterFunction = CesiumAsync::Future<GltfConverterResult> (*)(
       const gsl::span<const std::byte>& content,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& subprocessor);
 
   /**
    * @brief Register the given function for the given magic header.
@@ -117,13 +153,16 @@ class CESIUM3DTILESCONTENT_API GltfConverters {
    * the converter.
    * @param content The tile binary content that may contains the magic header
    * to look up the converter and is used to convert to gltf model.
-   * @param options The {@link CesiumGltfReader::GltfReaderOptions} for how to read a glTF.
+   * @param options The {@link CesiumGltfReader::GltfReaderOptions} for how to
+   * read a glTF.
+   * @param assetFetcher An object that can perform recursive asset requests.
    * @return The {@link GltfConverterResult} that stores the gltf model converted from the binary data.
    */
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const std::string& filePath,
       const gsl::span<const std::byte>& content,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 
   /**
    * @brief Creates the {@link GltfConverterResult} from the given
@@ -142,12 +181,15 @@ class CESIUM3DTILESCONTENT_API GltfConverters {
    *
    * @param content The tile binary content that may contains the magic header
    * to look up the converter and is used to convert to gltf model.
-   * @param options The {@link CesiumGltfReader::GltfReaderOptions} for how to read a glTF.
+   * @param options The {@link CesiumGltfReader::GltfReaderOptions} for how to
+   * read a glTF.
+   * @param assetFetcher An object that can perform recursive asset requests.
    * @return The {@link GltfConverterResult} that stores the gltf model converted from the binary data.
    */
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const gsl::span<const std::byte>& content,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 
 private:
   static std::string toLowerCase(const std::string_view& str);

Cesium3DTilesContent/include/Cesium3DTilesContent/I3dmToGltfConverter.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <Cesium3DTilesContent/GltfConverterResult.h>
+#include <CesiumAsync/Future.h>
+#include <CesiumGltf/Model.h>
+#include <CesiumGltfReader/GltfReader.h>
+
+#include <glm/mat4x4.hpp>
+#include <gsl/span>
+
+#include <optional>
+
+namespace Cesium3DTilesContent {
+struct AssetFetcher;
+
+struct I3dmToGltfConverter {
+  static CesiumAsync::Future<GltfConverterResult> convert(
+      const gsl::span<const std::byte>& instancesBinary,
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
+};
+} // namespace Cesium3DTilesContent

Cesium3DTilesContent/include/Cesium3DTilesContent/PntsToGltfConverter.h

@@ -2,6 +2,7 @@
 
 #include "GltfConverterResult.h"
 
+#include <CesiumAsync/Future.h>
 #include <CesiumGltf/Model.h>
 #include <CesiumGltfReader/GltfReader.h>
 
@@ -10,9 +11,12 @@
 #include <optional>
 
 namespace Cesium3DTilesContent {
+struct AssetFetcher;
+
 struct PntsToGltfConverter {
-  static GltfConverterResult convert(
+  static CesiumAsync::Future<GltfConverterResult> convert(
       const gsl::span<const std::byte>& pntsBinary,
-      const CesiumGltfReader::GltfReaderOptions& options);
+      const CesiumGltfReader::GltfReaderOptions& options,
+      const AssetFetcher& assetFetcher);
 };
 } // namespace Cesium3DTilesContent