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author | Andrei Karas <akaras@inbox.ru> | 2017-10-10 22:14:45 +0300 |
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committer | Andrei Karas <akaras@inbox.ru> | 2017-10-10 22:15:57 +0300 |
commit | aa3f63fd497558a02feb3ddbc44f31eac091f39b (patch) | |
tree | 0e28b9b1f0501dd8be9e1a38db4ec1777fa3fbfa /docs/packages.txt | |
parent | 7c10a6b61e9d06a4ae9cc9f942dfacb6fcfd9d3d (diff) | |
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diff --git a/docs/packages.txt b/docs/packages.txt deleted file mode 100644 index 779b9eb6b..000000000 --- a/docs/packages.txt +++ /dev/null @@ -1,250 +0,0 @@ ------------------------------ -MANAPLUS PACKAGE SYSTEM ------------------------------ - -1. INTRODUCTION -2. LOCATION OF DATA -3. CONTENTS OF DATA PACKAGE -4. TYPES OF DATA -5. INITIALIZING PACKAGE MANAGEMENT -6. LOADING A REQUESTED RESOURCE -7. RESOURCE MANAGEMENT DETAILS - - -1. INTRODUCTION - -Mana is expected to grow continuously with updates to the game world -occurring relatively frequently. More often so than for example new releases -of the game client. To make sure players don't have to update their data -manually all the time, by for example downloading the latest from the website, -the Mana client should be able to automatically obtain new data packages from -the server. - - Note: To reduce the load on the server (which isn't expected to have huge - free uploading resources), the idea is that the server will only send a - torrent file to the client and that the file is subsequently downloaded from - several locations that have volunteered to spread Mana data files. Ultimately - a simple option on the client will even allow players to contribute their - excess bandwidth to help other players get the updates faster. - - -2. LOCATION OF DATA - -There are two locations where Mana can look for game data. The install data -directory and the data directory in the user's home directory. The latter one -doesn't have to be used for Windows users, but is required for dynamic updates -for UNIX users, who generally won't have write permissions to the install -data directory. So for UNIX the two locations are: - - /usr/local/share/manaworld/data/* - - ~/.manaworld/data/* - -While for Windows all the data will be located at: - - C:\Program Files\Mana\data\* - -In the UNIX case it doesn't matter in which order the data directories are -examined. - - -3. CONTENTS OF DATA PACKAGE - -The contents of the data packages are strictly categorized and all packages -share a single root, similar to the paths on a UNIX system. The name of the -package is irrelevant. An example of the contents is given by: - - /graphics/sprites/forest/pinetree.png - /graphics/sprites/furniture/bed.png - /graphics/tiles/dark_forest.png - /graphics/tiles/city.png - /music/eagles_are_watching.xm - /music/silent_rose.xm - /sound/battle/sword1.ogg - /sound/battle/sword2.ogg - /maps/deep_desert.tmx - /maps/desert_town.tmx - /tilesets/dark_forest.tsx - /tilesets/city.tsx - /scripts/Portal.rb - /scripts/PawnShop.rb - /scripts/Fountain.rb - - -4. TYPES OF DATA - - png - The preferred format for images - xm - The preferred format for music (or other kinds of module formats) - ogg - The preferred format for sound effects - tmx - The map format (to be implemented) - tsx - The tile set format (to be implemented) - rb - A Ruby script file (application to be discussed) - - -5. INITIALIZING PACKAGE MANAGEMENT - -When Mana starts it will scan its data directories for both packages (archives) -and directories. When a directory is found with the same name as a package, the -directory is the preferred location to load data from as it is assumed to be -more up to date. - -Each package will have an ID and a file listing associated with it. Having made -a list of all packages they are processed in the order of their IDs. A mapping -is made from file to package, as follows: - - /music/eagles_are_watching.xm -> /usr/local/share/manaworld/data/musicpack - /music/silent_rose.xm -> /usr/local/share/manaworld/data/musicpack - /sound/battle/sword1.ogg -> ~/.manaworld/data/patch1 - /sound/battle/sword2.ogg -> ~/.manaworld/data/patch1 - ... - -Because the packages are loaded in the order of their IDs, it is made sure that -each file will always point to the package in which is was last updated. The -package IDs make sure that there is an absolute ordering of the packages. - -To allow the client to get rid of old packages, a package can declare an -arbitrary amount of packages with a lower ID than itself as obsolete. These -packages will then be ignored by the client, and optionally they can be -automatically deleted. - - -6. LOADING A REQUESTED RESOURCE - -When the game starts and during the game, resources will continuously be asked -for. A resource manager will take care that each resource is only loaded once. -It also makes sure that the resources are loaded from the right package using -the constructed mapping. - -As noted above, the resource manager makes sure directories are preferred -to package files when resources are loaded. The presence of directories is -only expected in the case of developers that will relatively frequently update -the data while working on the next package to be released. - - -7. RESOURCE MANAGEMENT DETAILS - -The resource management technique is critical to the overall success of the -package management system as a whole. Resources are loaded at runtime as they -are needed, and unloaded as they become unused. In order to ensure the -autonomous functioning of this process reference counting is the agreed upon -technique for managing loaded resources in Mana. - -For those unfamiliar with the practice of reference counting, it involves -every resource object having a variable containing the number of references to -the object. When a reference is added the function addRef() is called and when -it is removed the function release() is called. When the reference count -reaches zero the object will automatically delete itself, thus handling the -cleanup of resources. - -Reference counting will form the core of the resource management system. Each -resource object will have the functionality of a reference counted object. The -resource manager will hold ResourceEntry objects. The resource entry object -contains a pointer to the resource as well as the location of the path of the -file the resource was loaded from. This would look something like: - - /** - * A generic reference counted resource object. - */ - class Resource { - public: - /** - * Loads the resource from the specified path. - * @param filePath The path to the file to be loaded. - * @return <code>true</code> if loaded <code>false</code> otherwise. - */ - virtual bool Load(std::string filePath) = 0; - ... - /** - * Increments the reference counted of this object. - */ - void addRef() { ++referenceCount; } - - /** - * Decrements the reference count and deletes the object - * if no references are left. - * @return <code>true</code> if the object was deleted - * <code>false</code> otherwise. - */ - void release() { - --referenceCount; - - if (!referenceCount) - { - delete this; - return true; - } - - return false; - } - private: - unsigned int referenceCount; - }; - ... - /** - * A resource entry descriptor. - */ - struct ResourceEntry { - Resource* resource; - std::string filePath; - }; - ... - -The resource manager would then hold a mapping containing the resource entry as -well as the string defining its resource identification path. The resource -manager would thus look something like this: - - /** - * A class for loading and managing resources. - */ - class ResourceManager { - public: - ... - private: - std::map<std::string, ResourceEntry> resources; - }; - ... - -This will allow the game to load resources with little awareness of the actual -path from which they were loaded. The resource manager will also act as a -resource object factory. A factory object is an object that creates an -instance of an object derived from a common base class. In this case it will -create Resource objects. This would make the ResourceManager object look like -this: - - /** - * A class for loading and managing resources. - */ - class ResourceManager { - public: - enum E_RESOURCE_TYPE - { - MAP, - MUSIC, - IMAGE, - SCRIPT, - TILESET, - SOUND_EFFECT - }; - - /** - * Creates a resource and adds it to the resource map. - * The idPath is converted into the appropriate path - * for the current operating system and the resource - * is loaded. - * @param type The type of resource to load. - * @param idPath The resource identifier path. - * @return A valid resource or <code>NULL</code> if - * the resource could not be loaded. - */ - Resource* Create(const E_RESOURCE_TYPE& type, - std::string idPath); - ... - private: - std::map<std::string, ResourceEntry> resources; - }; - ... - -Loading a resource would then look something like: - - Image* img = (Image*) ResourceManager.Create(ResourceManager::IMAGE, - "/graphics/tiles/dark_forest.png"); |