Add JSON parser

src/dawn/asset/AssetManager.cpp

@@ -6,6 +6,7 @@
 #include "AssetManager.hpp"
 #include "loaders/TextureLoader.hpp"
 #include "loaders/TrueTypeLoader.hpp"
+#include "loaders/JSONLoader.hpp"
 
 using namespace Dawn;
 
@@ -80,6 +81,20 @@ std::shared_ptr<TrueTypeTexture> AssetManager::get<TrueTypeTexture>(
   return loader->getTexture(fontSize);
 }
 
+template<>
+std::shared_ptr<json> AssetManager::get<json>(
+  const std::string filename
+) {
+  auto existing = this->getExisting<JSONLoader>(filename);
+  if(existing) return existing->data;
+
+  std::shared_ptr<JSONLoader> loader = std::make_shared<JSONLoader>(
+    filename
+  );
+  pendingAssetLoaders.push_back(std::static_pointer_cast<AssetLoader>(loader));
+  return loader->data;
+}
+
 
 AssetManager::~AssetManager() {
   

src/dawn/asset/AssetManager.hpp

@@ -80,6 +80,7 @@ namespace Dawn {
        * Returns the asset loader for the given asset.
        * 
        * @param filename The filename of the asset to get.
+       * @param fontSize The font size to get the truetype asset of.
        * @return The asset loader for the given asset.
        */
       template<class T>

src/dawn/asset/loaders/CMakeLists.txt

@@ -8,4 +8,5 @@ target_sources(${DAWN_TARGET_NAME}
   PRIVATE
     TextureLoader.cpp
     TrueTypeLoader.cpp
+    JSONLoader.cpp
 )

src/dawn/asset/loaders/JSONLoader.cpp

@@ -0,0 +1,46 @@
+// Copyright (c) 2024 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#include "JSONLoader.hpp"
+#include "assert/assert.hpp"
+
+using namespace Dawn;
+
+JSONLoader::JSONLoader(const std::string name) :
+  AssetLoader(name),
+  loader(name + ".json"),
+  state(JSONLoaderLoadState::INITIAL)
+{
+  data = std::make_shared<json>();
+}
+
+void JSONLoader::updateAsync() {
+  if(this->state != JSONLoaderLoadState::INITIAL) return;
+  this->state = JSONLoaderLoadState::LOADING_FILE;
+
+  this->loader.open();
+  auto size = this->loader.getSize();
+
+  auto buffer = new uint8_t[size + 1];
+  assertNotNull(buffer, "Failed to allocate buffer!");
+
+  this->state = JSONLoaderLoadState::PARSING_DATA;
+  auto read = this->loader.read(buffer, size);
+  assertTrue(read == size, "Failed to read entire file!");
+  buffer[size] = '\0';
+
+  *data = json::parse(buffer);
+  delete[] buffer;
+
+  this->state = JSONLoaderLoadState::DONE;
+  this->loaded = true;
+}
+
+void JSONLoader::updateSync() {
+}
+
+JSONLoader::~JSONLoader() {
+  this->data = nullptr;
+}

src/dawn/asset/loaders/JSONLoader.hpp

@@ -0,0 +1,42 @@
+// Copyright (c) 2024 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "asset/AssetLoader.hpp"
+#include "asset/AssetDataLoader.hpp"
+
+namespace Dawn {
+  enum class JSONLoaderLoadState {
+    INITIAL,
+    LOADING_FILE,
+    PARSING_DATA,
+    DONE
+  };
+
+  class JSONLoader : public AssetLoader {
+    protected:
+      AssetDataLoader loader;
+      enum JSONLoaderLoadState state;
+
+    public:
+      std::shared_ptr<json> data;
+
+      /**
+       * Constructs a JSON asset loader. You should instead use the parent
+       * asset managers' abstracted load method
+       * 
+       * @param name File name asset to load, omitting the extension.
+       */
+      JSONLoader(const std::string name);
+
+      void updateSync() override;
+      void updateAsync() override;
+
+      /**
+       * Dispose / Cleanup the JSON asset.
+       */
+      ~JSONLoader();
+  };
+}

src/dawn/dawnlibs.hpp

@@ -47,4 +47,7 @@ extern "C" {
 // #include <glm/gtx/intersect.hpp>
 #include <glm/gtc/type_ptr.hpp>
 #define GLM_ENABLE_EXPERIMENTAL 1
-#include <glm/gtx/matrix_decompose.hpp>
+#include <glm/gtx/matrix_decompose.hpp>
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;