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49 lines
2.4 KiB
C++
49 lines
2.4 KiB
C++
#ifndef RESOURCES_CPP
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#define RESOURCES_CPP
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#include <assert.h>
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// Mostly Chapter 2
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// Handles resource management
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namespace Textures // This gives us a scope for the enumerators which allows us to write Textures::Airplane instead of just Airplane to avoid name collisions in the global scope
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{
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enum ID { Landscape, Airplane, Missile };
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}
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class TextureHolder
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{
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public:
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void load(Textures::ID id, const std::string& filename);
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sf::Texture& get(Textures::ID id);
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const sf::Texture& get(Textures::ID id) const;
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private:
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std::map< Textures::ID, std::unique_ptr<sf::Texture> > mTextureMap;
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// unique_ptr are class templates that act like pointers, this allows us to work with heavyweight objects without copying them all the time, or we can store classes that are non-cpyable like sf::Shader
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};
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void TextureHolder::load(Textures::ID id, const std::string& filename)
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// Function to load a resource, it takes one parameter for filename and one for identifier
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{
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std::unique_ptr<sf::Texture> texture(new sf::Texture()); // Create sf:Texture and store it in the unique pointer
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if(!texture -> loadFromFile(filename))// Load the texture from the filename
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{
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throw std::runtime_error(TEXTURE_LOAD_ERROR + filename);
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}
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auto inserted = mTextureMap.insert(std::make_pair(id, std::move(texture))); // Insert texture into map mTextureMap, std::move used to take ownership from texture variable and transfer it to std::make_pair(), std::move moves the resource into a new place and removes it from earlier place https://en.cppreference.com/w/cpp/utility/move
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assert(inserted.second);
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}
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sf::Texture& TextureHolder::get(Textures::ID id) // returns a reference to a texture
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{
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auto found = mTextureMap.find(id); // find returns an iterator to the found element or end() if nothing was found
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assert(found != mTextureMap.end());
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return *found -> second; // We have to access the second member of the pointer, then we deference it and get a texture
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}
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const sf::Texture& TextureHolder::get(Textures::ID id) const // we need to be able to invoke get() also if we only have a pointer/reference to the const TextureHolder, it returns const sf::Texture so the texture cannot be changed by caller
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{
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auto found = mTextureMap.find(id); // find returns an iterator to the found element or end() if nothing was found
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return *found -> second; // We have to access the second member of the pointer, then we deference it and get a texture
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}
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#endif //RESOUIRCES_CPP
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