Add GetWorld to Actor. Integrate google test. Add Model manager class. Rename *.h to *.hpp files

Core/Core/RenderEngine/ModelManager.cpp

@@ -0,0 +1,73 @@
+#include "ModelManager.hpp"
+
+ModelManager::StaticModel::StaticModel(const std::vector<Voxel>& voxels, std::string name):
+name_(std::move(name)),
+voxels_(voxels)
+{
+    glm::ivec3 sum_moments{0, 0, 0};
+    int sum_masses = 0;
+
+    for (auto& i : voxels_)
+    {
+        sum_moments += glm::ivec3{i.loc.x * i.mass, i.loc.y * i.mass, i.loc.z * i.mass};
+        sum_masses += i.mass;
+    }
+
+    if(sum_masses != 0)
+        sum_moments /= sum_masses;
+    else if (!voxels_.empty())
+    {
+        sum_moments.x /= static_cast<int>(voxels_.size());
+        sum_moments.y /= static_cast<int>(voxels_.size());
+        sum_moments.z /= static_cast<int>(voxels_.size());
+    }
+    
+    mass_center_ = sum_moments;
+}
+
+ModelManager::StaticModel::~StaticModel()
+{
+    OnDestroy.Call(name_);
+}
+
+unsigned int ModelManager::FNV1aHash(const char* buf)
+{	
+    unsigned int h_val = 0x811c9dc5;
+
+    while (*buf)
+    {
+        h_val ^= static_cast<unsigned int>(*buf++);
+        h_val *= 0x01000193;
+    }
+
+    return h_val;
+}
+
+void ModelManager::OnDestroySometimeModelCaller(const std::string& name)
+{
+    OnDestroySometimeModel.Call(name);
+}
+
+ModelManager::~ModelManager()
+{
+    for (const auto& [it, model] : models)
+    {
+        model->OnDestroy.unbind(this, &ModelManager::OnDestroySometimeModelCaller);
+    }
+    models.clear();
+}
+
+std::shared_ptr<ModelManager::StaticModel> ModelManager::LoadModel(const std::string& name)
+{
+    unsigned int hash = FNV1aHash(name.c_str());
+    auto model = models.find(hash);
+    if (model != models.cend())
+        return model->second;
+
+    std::vector<Voxel> model_data;
+    // Load model_data
+    auto newModel = std::make_shared<StaticModel>(model_data, name);
+    newModel->OnDestroy.bind(this, &ModelManager::OnDestroySometimeModelCaller);
+    models[hash] = newModel;
+    return models[hash];
+}