added load from json game objects

src/items/GameObjectLoader.cpp

@@ -0,0 +1,134 @@
+#include "GameObjectLoader.h"
+#include <fstream>
+#include <iostream>
+#include <cmath>
+#include "render/Renderer.h"
+#include "render/TextureManager.h"
+#include "utils/Utils.h"
+#include <Eigen/Geometry>
+
+namespace ZL {
+
+	using json = nlohmann::json;
+
+	std::vector<GameObjectData> GameObjectLoader::loadFromJson(const std::string& jsonPath, const std::string& zipPath)
+	{
+		std::vector<GameObjectData> objects;
+		json j;
+
+		try {
+			std::ifstream file(jsonPath);
+			if (!file.is_open()) {
+				throw std::runtime_error("Could not open file: " + jsonPath);
+			}
+
+			if (file.peek() == std::ifstream::traits_type::eof()) {
+				throw std::runtime_error("JSON file is empty: " + jsonPath);
+			}
+
+			file >> j;
+
+			if (!j.contains("objects") || !j["objects"].is_array()) {
+				std::cerr << "Warning: 'objects' array not found in " << jsonPath << std::endl;
+				return objects;
+			}
+
+			for (const auto& item : j["objects"]) {
+				GameObjectData data;
+
+				data.name = item.value("name", "Unknown");
+				data.texturePath = item.value("texturePath", "");
+				data.meshPath = item.value("meshPath", "");
+
+				data.rotationX = item.value("rotationX", 0.0f);
+				data.rotationY = item.value("rotationY", 0.0f);
+				data.rotationZ = item.value("rotationZ", 0.0f);
+
+				data.positionX = item.value("positionX", 0.0f);
+				data.positionY = item.value("positionY", 0.0f);
+				data.positionZ = item.value("positionZ", 0.0f);
+
+				data.scale = item.value("scale", 1.0f);
+
+				if (!data.meshPath.empty()) {
+					objects.push_back(data);
+				}
+			}
+
+			std::cout << "Successfully loaded " << objects.size() << " game objects from " << jsonPath << std::endl;
+
+		} catch (const std::exception& e) {
+			std::cerr << "Error loading JSON: " << e.what() << std::endl;
+		}
+
+		return objects;
+	}
+
+	std::unordered_map<std::string, LoadedGameObject> GameObjectLoader::loadAndCreateGameObjects(
+		const std::string& jsonPath,
+		Renderer& renderer,
+		const std::string& zipPath)
+	{
+		std::unordered_map<std::string, LoadedGameObject> gameObjects;
+		std::vector<GameObjectData> objectsData = loadFromJson(jsonPath, zipPath);
+
+		for (const auto& objData : objectsData) {
+			std::cout << "Loading game object: " << objData.name << std::endl;
+
+			LoadedGameObject gameObj;
+			gameObj.name = objData.name;
+
+			// Load texture
+			try {
+				gameObj.texture = std::make_shared<Texture>(CreateTextureDataFromPng(objData.texturePath, zipPath.c_str()));
+			}
+			catch (const std::exception& e) {
+				std::cerr << "GameObjectLoader: Failed to load texture for '" << objData.name << "': " << e.what() << std::endl;
+				continue;
+			}
+
+			// Load mesh
+			try {
+				gameObj.mesh.data = LoadFromTextFile02(objData.meshPath, zipPath);
+			}
+			catch (const std::exception& e) {
+				std::cerr << "GameObjectLoader: Failed to load mesh for '" << objData.name << "': " << e.what() << std::endl;
+				continue;
+			}
+
+			// Apply rotation
+			Eigen::Quaternionf rotationQuat = Eigen::Quaternionf::Identity();
+
+			if (objData.rotationX != 0.0f) {
+				rotationQuat = Eigen::Quaternionf(Eigen::AngleAxisf(objData.rotationX, Eigen::Vector3f::UnitX())) * rotationQuat;
+			}
+			if (objData.rotationY != 0.0f) {
+				rotationQuat = Eigen::Quaternionf(Eigen::AngleAxisf(objData.rotationY, Eigen::Vector3f::UnitY())) * rotationQuat;
+			}
+			if (objData.rotationZ != 0.0f) {
+				rotationQuat = Eigen::Quaternionf(Eigen::AngleAxisf(objData.rotationZ, Eigen::Vector3f::UnitZ())) * rotationQuat;
+			}
+
+			gameObj.mesh.data.RotateByMatrix(rotationQuat.toRotationMatrix());
+
+			// Apply scale
+			if (objData.scale != 1.0f) {
+				gameObj.mesh.data.Scale(objData.scale);
+			}
+
+			// Apply position
+			if (objData.positionX != 0.0f || objData.positionY != 0.0f || objData.positionZ != 0.0f) {
+				gameObj.mesh.data.Move({ objData.positionX, objData.positionY, objData.positionZ });
+			}
+
+			gameObj.mesh.RefreshVBO();
+			gameObjects[objData.name] = gameObj;
+
+			std::cout << "Successfully loaded: " << objData.name << std::endl;
+		}
+
+		std::cout << "Total game objects loaded: " << gameObjects.size() << std::endl;
+		return gameObjects;
+	}
+
+} // namespace ZL