A cross-platform data-driven game engine written in C++.
Data Driven. Melon implement an Entity Component System (ECS) framework, which is massively multi-threaded and cache-friendly.
Modular Design. Melon consists of multiple optional modules. Each module can be compiled and linked independently, allowing convenient frontend backend separation.
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Simple to use
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Data stored in contiguous memory
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Task-based asynchronous pattern
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Can detect entity creation and destruction in a ECS way
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Can detect component addition and removement in a ECS way
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Component sharing supported
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Singleton supported
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Simple entity filter supported
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Based on Vulkan
Melon implement an rigorous ECS framework with multiple convenient mechanisms.
Entity. As defined in ECS architecture, an Entity is just a id to bind different type of components, it does not have behaviour and data.
Component. A Component is a struct that contains only data. Each Component will occupy a block of memory, and Components of the same type are stored contiguously in a way.
Notice that pointers are not recommanded to be stored in it, especially smart pointer, because the memory management uses memset.
System. A System uses EntityFilters to get a set of Entities, and then conducts behaviours on the data binded to them.
EntityFilter. An EntityFilter specify conditions to filter Entities, such as with or without certain types of Components.
SharedComponent. A SharedComponent can be shared among Entities. Entities with the same SharedComponent are organized contiguously, which is helpful to implement render batch, etc.
SingletonComponent. A SingletonComponent is independent and not binded to an Entity. It is used for global data and singleton pattern.
ManualComponent. A ManualComponent will not be removed when destroying the binding Entity. An well-designed EntityFilter can be used to detect the Entity destruction, and then the ManualComponent should be mananually removed.
Entity creation can be detected by filtering Entities without certain type of ManualComponent, and then manually add a ManualComponent of this type to avoid duplicate detection. Component additon and removement can be detected in a similar way.
ManualSharedComponent. A ManualSharedComponent is similar to a ManualComponent
Melon is licensed under the BSD 3-Clause License.