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A game programmer is a software engineer , programmer , or computer scientist who primarily develops codebases for video games or related software , such as game development tools. Game programming has many specialized disciplines, all of which fall under the umbrella term of "game programmer".
In the early days of video games from the early s to mids , a game programmer also took on the job of a designer and artist. This was generally because the abilities of early computers were so limited that having specialized personnel for each function was unnecessary. Game concepts were generally light and games were only meant to be played for a few minutes at a time, but more importantly, art content and variations in gameplay were constrained by computers' limited power.
Later, as specialized arcade hardware and home systems became more powerful, game developers could develop deeper storylines and could include such features as high-resolution and full color graphics, physics , advanced artificial intelligence and digital sound.
Technology has advanced to such a great degree that contemporary games usually boast 3D graphics and full motion video using assets developed by professional graphic artists. Nowadays, the derogatory term " programmer art " has come to imply the kind of bright colors and blocky design that were typical of early video games. The desire for adding more depth and assets to games necessitated a division of labor.
Initially, art production was relegated to full-time artists. Next game programming became a separate discipline from game design.
Now, only some games, such as the puzzle game Bejeweled , are simple enough to require just one full-time programmer. Despite this division, however, most game developers artists, programmers and even producers have some say in the final design of contemporary games. A contemporary video game may include advanced physics, artificial intelligence, 3D graphics, digitised sound, an original musical score, complex strategy and may use several input devices such as mice , keyboards , gamepads and joysticks and may be playable against other people via the Internet or over a LAN.
Each aspect of the game can consume all of one programmer's time and, in many cases, several programmers. Some programmers may specialize in one area of game programming , but many are familiar with several aspects. The number of programmers needed for each feature depends somewhat on programmers' skills, but mostly are dictated by the type of game being developed.
Game engine programmers create the base engine of the game, including the simulated physics and graphics disciplines. They are often customized for a particular game, and these programmers handle these modifications. A game's physics programmer is dedicated to developing the physics a game will employ. For example, a space game may need simulated gravity , but would not have any need for simulating water viscosity.
Since processing cycles are always at a premium, physics programmers may employ "shortcuts" that are computationally inexpensive, but look and act "good enough" for the game in question. In other cases, unrealistic physics are employed to allow easier gameplay or for dramatic effect.
Sometimes, a specific subset of situations is specified and the physical outcome of such situations are stored in a record of some sort and are never computed at runtime at all. Some physics programmers may even delve into the difficult tasks of inverse kinematics and other motions attributed to game characters, but increasingly these motions are assigned via motion capture libraries so as not to overload the CPU with complex calculations.
For a role-playing game such as World of Warcraft , only one physics programmer may be needed. For a complex combat game such as Battlefield , teams of several physics programmers may be required. Historically, this title usually belonged to a programmer who developed specialized blitter algorithms and clever optimizations for 2D graphics. Today, however, it is almost exclusively applied to programmers who specialize in developing and modifying complex 3D graphic renderers.
Some 2D graphics skills have just recently become useful again, though, for developing games for the new generation of cell phones and handheld game consoles. A 3D graphics programmer must have a firm grasp of advanced mathematical concepts such as vector and matrix math, quaternions and linear algebra. Skilled programmers specializing in this area of game development can demand high wages and are usually a scarce commodity.
An AI programmer develops the logic of time to simulate intelligence in enemies and opponents. An AI programmer may program pathfinding , strategy and enemy tactic systems. This is one of the most challenging aspects of game programming and its sophistication is developing rapidly. Contemporary games dedicate approximately 10 to 20 percent of their programming staff to AI. Many game developers have created entire languages that can be used to program their own AI for games via scripts.
These languages are typically less technical than the language used to implement the game, and will often be used by the game or level designers to implement the world of the game. Many studios also make their games' scripting available to players, and it is often used extensively by third party mod developers. The AI technology used in games programming should not be confused with academic AI programming and research. Although both areas do borrow from each other, they are usually considered distinct disciplines, though there are exceptions.
Not always a separate discipline, sound programming has been a mainstay of game programming since the days of Pong. Most games make use of audio, and many have a full musical score. Computer audio games eschew graphics altogether and use sound as their primary feedback mechanism. Many games use advanced techniques such as 3D positional sound , making audio programming a non-trivial matter. With these games, one or two programmers may dedicate all their time to building and refining the game's sound engine, and sound programmers may be trained or have a formal background in digital signal processing.
Scripting tools are often created or maintained by sound programmers for use by sound designers. These tools allow designers to associate sounds with characters, actions, objects and events while also assigning music or atmospheric sounds for game environments levels or areas and setting environmental variables such as reverberation. Though all programmers add to the content and experience that a game provides, a gameplay programmer focuses more on a game's strategy, implementation of the game's mechanics and logic, and the "feel" of a game.
This is usually not a separate discipline, as what this programmer does usually differs from game to game, and they will inevitably be involved with more specialized areas of the game's development such as graphics or sound.
This programmer may implement strategy tables, tweak input code, or adjust other factors that alter the game. Many of these aspects may be altered by programmers who specialize in these areas, however for example, strategy tables may be implemented by AI programmers.
In early video games, gameplay programmers would write code to create all the content in the game—if the player was supposed to shoot a particular enemy, and a red key was supposed to appear along with some text on the screen, then this functionality was all written as part of the core program in C or assembly language by a gameplay programmer.
More often today the core game engine is usually separated from gameplay programming. This has several development advantages. The game engine deals with graphics rendering, sound, physics and so on while a scripting language deals with things like cinematic events, enemy behavior and game objectives.
Large game projects can have a team of scripters to implement these sorts of game content. Scripters usually are also game designers. This programmer specializes in programming user interfaces UIs for games. Most UIs look 2D, though contemporary UIs usually use the same 3D technology as the rest of the game so some knowledge of 3D math and systems is helpful for this role.
Advanced UI systems may allow scripting and special effects, such as transparency, animation or particle effects for the controls. Input programming, while usually not a job title, or even a full-time position on a particular game project, is still an important task.
This programmer writes the code specifying how input devices such as a keyboard , mouse or joystick affect the game. These routines are typically developed early in production and are continually tweaked during development.
Normally, one programmer does not need to dedicate his entire time to developing these systems. A real-time motion-controlled game utilizing devices such as the Wii Remote or Kinect may need a very complex and low latency input system, while the HID requirements of a mouse-driven turn-based strategy game such as Heroes of Might and Magic are significantly simpler to implement. This programmer writes code that allows players to compete or cooperate, connected via a LAN or the Internet or in rarer cases, directly connected via modem.
Network latency , packet compression, and dropped or interrupted connections are just a few of the concerns one must consider. Although multi-player features can consume the entire production timeline and require the other engine systems to be designed with networking in mind, network systems are often put off until the last few months of development, adding additional difficulties to this role. Some titles have had their online features often considered lower priority than the core gameplay cut months away from release due to concerns such as lack of management, design forethought, or scalability.
Virtua Fighter 5 for the PS3 is a notable example of this trend. The tools programmer  can assist the development of a game by writing custom tools for it. Game development Tools often contain features such as script compilation, importing or converting art assets, and level editing. While some tools used may be COTS products such as an IDE or a graphics editor, tools programmers create tools with specific functions tailored to a specific game which are not available in commercial products.
For example, an adventure game developer might need an editor for branching story dialogs , and a sport game developer could use a proprietary editor to manage players and team stats. These tools are usually not available to the consumers who buy the game.
Porting a game from one platform to another has always been an important activity for game developers. Some programmers specialize in this activity, converting code from one operating system to work on another. Sometimes, the programmer is responsible for making the application work not for just one operating system, but on a variety of devices, such as mobile phones.
Often, however, "porting" can involve re-writing the entire game from scratch as proprietary languages , tools or hardware make converting source code a fruitless endeavour.
This programmer may also have to side-step buggy language implementations, some with little documentation, refactor code , oversee multiple branches of code, rewrite code to scale for wide variety of screen sizes and implement special operator guidelines. They may also have to fix bugs that were not discovered in the original release of a game. Unlike other members of the programming team, the technology programmer usually isn't tied to a specific project or type of development for an extended length of time, and they will typically report directly to a CTO or department head rather than a game producer.
As the job title implies, this position is extremely demanding from a technical perspective and requires intimate knowledge of the target platform hardware. Tasks cover a broad range of subjects including the practical implementation of algorithms described in research papers, very low-level assembly optimization and the ability to solve challenging issues pertaining to memory requirements and caching issues during the latter stages of a project.
There is considerable amount of cross-over between this position and some of the others, particularly the graphics programmer.
In smaller teams, one or more programmers will often be described as 'Generalists' who will take on the various other roles as needed. Generalists are often engaged in the task of tracking down bugs and determining which subsystem expertise is required to fix them.
The lead programmer is ultimately in charge of all programming for the game. It is their job to make sure the various submodules of the game are being implemented properly and to keep track of development from a programming standpoint.
A person in this role usually transitions from other aspects of game programming to this role after several years of experience. Despite the title, this person usually has less time for writing code than other programmers on the project as they are required to attend meetings and interface with the client or other leads on the game. However, the lead programmer is still expected to program at least some of the time and is also expected to be knowledgeable in most technical areas of the game.
There is often considerable common ground in the role of technical director and lead programmer, such that the jobs are often covered by one person. Game programmers can specialize on one platform or another, such as the Wii U or Windows.
So, in addition to specializing in one game programming discipline, a programmer may also specialize in development on a certain platform. Also, general game development principles such as 3D graphics programming concepts, sound engineering and user interface design are naturally transferable between platforms. Notably, there are many game programmers with no formal education in the subject, having started out as hobbyists and doing a great deal of programming on their own, for fun, and eventually succeeding because of their aptitude and homegrown experience.
However, most job solicitations for game programmers specify a bachelor's degree in mathematics, physics, computer science, "or equivalent experience".