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Concept
Game engine recreation
Summary
Game engine recreation is a type of video game engine remastering process whereby a new game engine is rewritten from scratch as a clone of the original with the ability to load the original game's data files such as music, textures, scripts, shaders, levels, and more. The new engine should read these data files and, in theory, load and understand them in a way that is indistinguishable from the original. The result of a proper engine clone is often the ability to play a game on modern systems that the old game could no longer run on. It also opens the possibility of community collaboration, as many engine remake projects tend to be open source. Game engine recreation can be beneficial to game publishers because the legal use of a re-creation still requires the original data files, as a player must still purchase the original game in order to legally play the re-created game (as detailed in this list of game engine recreations).
Game engine recreations are made to allow the usage of classical games with newer operating system versions, recent hardware or even completely different operating systems than originally intended. Another motivation is the ability to fix engine bugs which is often hard or impossible with the original engines (with notable exceptions, see community patch) once a software has become unsupported abandonware, with the source code not available.
High-level emulation
When game engine recreations are made in a top down development methodology, in the first step the general game's functionality is programmed and the structure is defined. Then, in later steps, the resulting engine is adapted to the specific detail behaviour of the original game, often by reverse engineering, debugging and profiling the original. An example is OpenRA based on specifications contributed by the community by clean-room re-implementations without dis-assembling the original executable, which result in game engines whose behavior differs from the original. Another example is the Total Annihilation engine remake Spring Engine, which resulted in being used for many more games.
Official source
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