Engo is an open-source 2D game engine written in Go.



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A cross-platform game engine written in Go following an interpretation of the Entity Component System paradigm. Engo is currently compilable for Mac OSX, Linux and Windows. With the release of Go 1.4, supporting Android and the inception of iOS compatibility, mobile has been be added as a release target. Web support (wasm) is also available.

v1.0 is now available! To celebrate, there will be a game jam coming soon to celebrate the release, start actually building things and hopefully find any issues. Updates for this will come soon.

Getting in touch / Contributing

We have a gitter chat for people to join who want to further discuss engo. We are happy to discuss bugs, feature requests and would love to hear about the projects you are building!

Getting Started

Theory: common vs engo

There are currently two major important packages within this repository: github.com/EngoEngine/engo and github.com/EngoEngine/engo/common.

The top level engo package contains the functionality of creating windows, starting the game, creating an OpenGL context and handling input. It is designed to be used with Systems designed as per github.com/EngoEngine/ecs specifications. The common package contains our ECS implementations of common game development Systems like a RenderSystem or CameraSystem.

Practice: Getting it to Run

  1. First, you have to install some dependencies:
  2. If you're running on Debian/Ubuntu: sudo apt-get install libasound2-dev libglu1-mesa-dev freeglut3-dev mesa-common-dev xorg-dev libgl1-mesa-dev git-all
  3. If you're running on Windows you'll need a gcc compiler that the go tool can use and have gcc.exe in your PATH environmental variable. We recommend Mingw since it has been tested. You'll also need git installed, we recommend getting it from The official Git site
  4. If you're on OSX, you will also need Git. You can find instructions here. You can also use homebrew to install git as well. Open an issue if you have any issues
  5. Then, you can go get it: go get -u github.com/EngoEngine/engo
  6. You may also want to get the dependencies of platform specific builds, so that build tools like godef can use them: go get -u -tags js ./... go get -u -tags android ./...
  7. Now, you have two choices:
  8. Visit our website, which hosts a full-blown tutorial series on how to create your own game, and on top of that, has some conceptual explanations;
  9. Check out some demos in our demos folder.
  10. Finally, if you run into problems, if you've encountered a bug, or want to request a feature, feel free to shoot us a DM or create an issue.

Breaking Changes Since v1.0

Engo is always undergoing a lot of optimizations and constantly gets new features. However, this sometimes means things break. In order to make transitioning easier for you, we have a list of those changes, with the most recent being at the top. If you run into any problems, please contact us at gitter.

  • TMXObject Width and Height is in pixels, and can be fractional. This has changed from an int to a float64.
  • TMXTileset now uses a Spritesheet instead of a Texture. This helps keep track of the guid better and allows the gid to not start at zero and have skips in it, as well as for borders and spacing in the tile sheet.
  • TMX Level's objects have all been rolled into Object rather than have separate things like "PolyLineObject". This is to be consistent with the TMX format.
  • The Shader interface now has a SetCamera(*CameraSystem) method. This method allows shaders to automatically update the camera system as it changes, such as between scenes or when the camera system is added.
  • The domain engo.io has expired. Now use github.com/EngoEngine/engo as the import path, and the site can be located at engoengine.github.io

Roadmap to v1.1

A list of issues for v1.1 can be found here. There's always room for improvement! Feel free to submit proposals, open issues, and let us know how we can improve!


Engo, originally known as Engi was written by ajhager as a general purpose Go game engine. With a desire to build it into an "ECS" game engine, it was forked to github.com/paked/engi. After passing through several iterations, it was decided that the project would be rebranded and rereleased as Engo on its own GitHub organization.


Thank you to everyone who has worked on, or with Engo. None of this would be possible without you, and your help has been truly amazing.

These are 3rd party projects that have made engo possible.

  • The original engi game engine which engo was based off of (BSD license)
  • Oto, a low-level cross-platform library to play sound. The AudioSystem uses this and is based on the audio package used in Ebiten.
  • Generic asset loader

    Generic asset loader

    It would be nice if users had the possibility to add their own filetype / extension / loader method to our asset loader.

    To be complete, we would then use that method ourselves.

    Thinking of a generic interface, let's brainstorm.

    type FileLoader interface {
        // Extensions returns the file extensions for which this FileLoader should be used, excluding the '.' in front of it
        Extensions() []string
        // Load is called with the url (location) of the file, and is called whenever the file must be loaded
        Load(url string) error
        // Unload is called with the url (location) of the file, and is called whenever the resources of the file should be freed from the memory
        Unload(url string) error

    There'd also have to be a generic method of retrieving the actual resource? Or not? Kinda like our engo.Files.Image("url") returns an actual (loaded) image.

    Thoughts? Improvements? Changes? Always welcome.

    feature refactoring 
    opened by EtienneBruines 48
  • Multithreading


    As Go is such a nice language to do multithreading in, and most games lack multithreading, it'd be nice if we supported it.

    Currently, each frame, we are iterating over all Systems, and iterating over all Entitys "in" those Systems.

    I'm not sure if we can safely multithread multiple Systems at once, but we could easily multithread the iteration over Entitys?

    Current implementation

        for _, system := range w.Systems() {
            if headless && system.SkipOnHeadless() {
                continue // so skip it
            for _, entity := range system.Entities() {
                if w.paused {
                    ok := entity.GetComponent(&unp)
                    if !ok {
                        continue // so skip it
                if entity.Exists {
                    system.Update(entity, dt)

    Proposed implementation

        for _, system := range w.Systems() {
            if headless && system.SkipOnHeadless() {
                continue // so skip it
            entities := system.Entities()
            // It's not always faster to multithread; so in this case we're not going to
            if len(entities) < 2*runtime.NumCPU() {
                for _, ent := range entities {
                    system.Update(ent, dt)
                continue // with other Systems
            entityChannel := make(chan *Entity)
            wg := sync.WaitGroup{}
            // Launch workers
            for i := 0; i < runtime.NumCPU(); i++ {
                go func() {
                    for ent := range entityChannel {
                        system.Update(ent, dt)
            // Give them something to do
            for _, entity := range entities {
                if w.paused {
                    ok := entity.GetComponent(&unp)
                    if !ok {
                        continue // so skip it
                if entity.Exists {
                    entityChannel <- entity
            // Wait until they're done, before continuing to other Systems

    I know it's a bit more code than the original implementation, but it sure is efficient.

    feature question 
    opened by EtienneBruines 31
  • Rotation support

    Rotation support

    Hi there,

    this is a PR (based on other ones) that adds rotation support for Engi.

    The rotation is implemented in the default shader. I'd like the changes I introduced in the shader interface.It may be possible to avoid this by passing the space width and height in the gl buffer.

    opened by faide 24
  • HUD example compiles but crashes

    HUD example compiles but crashes

    This crashes as soon as I launch the example with the following traceback:

    fatal error: unexpected signal during runtime execution
    [signal 0xb code=0x1 addr=0x0 pc=0x7f90bf226ff0]
    runtime stack:
    runtime.throw(0x7bac40, 0x2a)
        /home/faide/tools/go/src/runtime/panic.go:527 +0x90
        /home/faide/tools/go/src/runtime/sigpanic_unix.go:12 +0x5a
    goroutine 1 [syscall, locked to thread]:
    runtime.cgocall(0x60d8e0, 0xc8200c7ad0, 0x0)
        /home/faide/tools/go/src/runtime/cgocall.go:120 +0x11b fp=0xc8200c7a88 sp=0xc8200c7a58
    github.com/go-gl/gl/v2.1/gl._Cfunc_glowDrawElements(0x7f90bef73760, 0x600000004, 0x1403, 0x0)
        github.com/go-gl/gl/v2.1/gl/_obj/_cgo_gotypes.go:12227 +0x35 fp=0xc8200c7ad0 sp=0xc8200c7a88
    github.com/go-gl/gl/v2.1/gl.DrawElements(0x600000004, 0xc800001403, 0x0)
        /home/faide/go/src/github.com/go-gl/gl/v2.1/gl/package.go:19385 +0x45 fp=0xc8200c7af8 sp=0xc8200c7ad0
    github.com/paked/webgl.(*Context).DrawElements(0xc8200f6000, 0x4, 0x6, 0x1403, 0x0)
        /home/faide/go/src/github.com/paked/webgl/webgl_gl2.go:775 +0x42 fp=0xc8200c7b18 sp=0xc8200c7af8
        /home/faide/go/src/github.com/paked/engi/shaders.go:289 +0x168 fp=0xc8200c7b58 sp=0xc8200c7b18
        /home/faide/go/src/github.com/paked/engi/shaders.go:294 +0x21 fp=0xc8200c7b68 sp=0xc8200c7b58
        /home/faide/go/src/github.com/paked/engi/render.go:291 +0xce fp=0xc8200c7ca0 sp=0xc8200c7b68
    github.com/paked/engi/ecs.(*World).Update(0xc820014720, 0x0)
        /home/faide/go/src/github.com/paked/engi/ecs/world.go:121 +0x2d5 fp=0xc8200c7d90 sp=0xc8200c7ca0
        /home/faide/go/src/github.com/paked/engi/engi_glfw.go:194 +0x53 fp=0xc8200c7da8 sp=0xc8200c7d90
    github.com/paked/engi.runLoop(0x7f90bc69f360, 0xc6fb60, 0x400)
        /home/faide/go/src/github.com/paked/engi/engi_glfw.go:226 +0xd9 fp=0xc8200c7e70 sp=0xc8200c7da8
    github.com/paked/engi.Open(0x0, 0x71d4b0, 0x8, 0x0, 0x400, 0x280, 0x0, 0x0, 0x7f90bc69f360, 0xc6fb60)
        /home/faide/go/src/github.com/paked/engi/engi.go:68 +0xf4 fp=0xc8200c7ea0 sp=0xc8200c7e70
        /home/faide/go/src/github.com/paked/engi/demos/hud/hud.go:108 +0xab fp=0xc8200c7f50 sp=0xc8200c7ea0
        /home/faide/tools/go/src/runtime/proc.go:111 +0x2b0 fp=0xc8200c7fa0 sp=0xc8200c7f50
        /home/faide/tools/go/src/runtime/asm_amd64.s:1721 +0x1 fp=0xc8200c7fa8 sp=0xc8200c7fa0
    goroutine 17 [syscall, locked to thread]:
        /home/faide/tools/go/src/runtime/asm_amd64.s:1721 +0x1

    if I suppress the call to w.AddEntity(hudBg) it works so I suspect something in generateHUDBackground but I can't see what really differs from generateBackground which works fine.

    opened by faide 21
  • Split into `engo` and `core`

    Split into `engo` and `core`

    According to #245.

    Also Fixes #245. Fixes #246. Fixes #253. Fixes #280. Fixes #277. Fixes #228. Fixes #235.

    Working towards #261 as well.

    refactoring stability 
    opened by EtienneBruines 21
  • Cleanup: engi has both responder and Wo - global

    Cleanup: engi has both responder and Wo - global

    In engi.go, two variables are globally defined:

    var (
        responder   Responder
        Wo          Responder

    They have exactly the same value, and are used for exactly the same. Which one are we keeping?

    Side-node, if it's a Responder (and not a World), should we even call it Wo? It took me a while before I noticed why Wo didn't have the functions / variables available that World has.

    opened by EtienneBruines 21
  • Changed Systemer to System interface

    Changed Systemer to System interface

    Fixes #119

    Breaking change

    Things like

    type MyCustomSystem struct {

    have become

    type MyCustomSystem struct {

    Things like

    func (m *MyCustomSystem) New(*ecs.World) {
        m.System = ecs.NewSystem()

    have become

    func (m *MyCustomSystem) New(*ecs.World) {
        m.BasicSystemWrapper = ecs.NewBasicSystemWrapper(m)

    Things like

    func (*MyCustomSystem) Update(*ecs.Entity, float32) {}

    have become

    func (*MyCustomSystem) EUpdate(*ecs.Entity, float32) {}

    New features

    A valid System (which you can add to a World instance), is this:

    type MyCustomSystem struct {}
    func (*MyCustomSystem) Type() string { return "MyCustomSystem" }
    func (*MyCustomSystem) Priority() int { return 1 }
    func (*MyCustomSystem) AddEntity(*ecs.Entity) {}
    func (*MyCustomSystem) RemoveEntity(*ecs.Entity) {}
    func (*MyCustomSystem) New(*ecs.World) {}
    func (*MyCustomSystem) Update(dt float32) {}

    One can still use the 'old' behavior which does the looping-over-entities for you, this can be done like:

    type MyCustomSys struct {
    func (*MyCustomSys) Type() string { return "MyCustomSys" }
    func (*MyCustomSys) Pre() {}
    func (*MyCustomSys) Post() {}
    func (m *MyCustomSys) New(*ecs.World) {
        m.BasicSystemWrapper = ecs.NewBasicSystemWrapper(m)
    func (*MyCustomSys) EUpdate(*ecs.Entity, float32) {}
    refactoring review-needed 
    opened by EtienneBruines 19
  • Click handling

    Click handling

    How should clicks be handled according to the ECS?

    In javascript/html, there's some kind of propagation: the foremost element is clicked, then passed along to any other element that may have been involved ; and each time the element has the ability to stop the propagation.

    In ECS, I would assume there is some kind of System that monitors whether or not something gets clicked?

    Any best-practices here? Anything I misunderstood? (I imagine the "buttons" in the "main menu" I'm creating, to be some kind of clickable)

    Current status

    • [ ] Rightclick-handling
    feature question 
    opened by EtienneBruines 19
  • Keys namespace

    Keys namespace

    As of this moment, each key is under the same general namespace. So if you want the w key, you would get engo.W.

    My proposition: Namespace so we could get it with engo.Keys.W. This way we wouldn't "dirty" the general namespace and it would be easier with an IDE for example to understand what that engo.W means.

    help wanted proposal refactoring 
    opened by Sendoushi 18
  • Mint Linux/Ubuntu setup error

    Mint Linux/Ubuntu setup error

    I'm new to go (learning by making a game with engo) so it may be a misunderstanding on my part.

    $ sudo apt-get install libopenal-dev libglu1-mesa-dev freeglut3-dev mesa-common-dev xorg-dev libgl1-mesa-dev golang gccgo-go
    $ go get -u engo.io/engo
    # github.com/go-gl/mathgl/mgl32
    ../go/src/github.com/go-gl/mathgl/mgl32/mempool.go:12: undefined: sync.Pool
    ../go/src/github.com/go-gl/mathgl/mgl32/mempool.go:29: undefined: sync.Pool
    ../go/src/github.com/go-gl/mathgl/mgl32/mempool.go:41: undefined: sync.Pool
    # github.com/luxengine/math
    ../go/src/github.com/luxengine/math/sqrt_amd64.s:6 6a: No such file or directory: textflag.h
    # golang.org/x/mobile/internal/mobileinit
    ../go/src/golang.org/x/mobile/internal/mobileinit/ctx_android.go:8:17: fatal error: jni.h: No such file or directory
     #include <jni.h>
    compilation terminated.
    opened by F483 17
  • About performance

    About performance

    When rendering multiple images, for example, 100 PNG images, just static rendering, no change, use 50% of cpu. Using gomobile bind on Android, Use only common.Text Show fps, fps cannot be stabilized at 60. Is there any way to improve performance?

    opened by kayon 6
  • WSL to build on windows

    WSL to build on windows

    WSL's latest update includes monitor/window support. I'd like to test it out to and see if it's a viable alternative to MySys/Cygwin for building on windows yet.

    opened by Noofbiz 0
  • Update isometric demo to use tiles of different sizes

    Update isometric demo to use tiles of different sizes

    When isometric tiles of different sizes are used, Tiled arranges them such that the tile lines up with the bottom-most point of the grid, and allows the tiles to overflow. Update the isometric demo to account for that.

    opened by Noofbiz 0
  • Get Font Via URL

    Get Font Via URL

    Similar to all the other stuff in common, like common.GetLoadedSprite(url), but for fonts. This is so you can setup the font and call CreatePreloaded only one time, leading to only one font atlas. Then you can get it back using common.GetLoadedFont(url). This way systems only need the URLs rather than either playing with pointers to pass stuff around correctly, and calling CreatePreloaded more than once results in multiple font atlases being used.

    opened by Noofbiz 0
  • Use net/http instead of xrequests to open files on js

    Use net/http instead of xrequests to open files on js

    performance platform:web refactoring 
    opened by Noofbiz 0
  • Can't build with

    Can't build with "headless" build tag

    I tried to build my project with the headless tag, but got the following error: github.com/!engo!engine/[email protected]/engo_empty.go:79:4: fallthrough statement out of place

    opened by kori-irrlicht 2
  • cannot find module providing package: working directory is not part of a module

    cannot find module providing package: working directory is not part of a module

    I'm trying to execute the Tutorial 1 code but I run into this error:

    $ go run traffic.go
    traffic.go:4:2: cannot find module providing package github.com/EngoEngine/ecs: working directory is not part of a module
    traffic.go:5:2: cannot find module providing package github.com/EngoEngine/engo: working directory is not part of a module
    traffic.go:6:2: cannot find module providing package github.com/EngoEngine/engo/common: working directory is not part of a module

    I had to activate modules in order to solve this other error: https://github.com/EngoEngine/engo/issues/724

    opened by raphbqed 4
  • Raycasting system / demo

    Raycasting system / demo

    opened by Noofbiz 0
  • Batch rendering for text and shape shaders

    Batch rendering for text and shape shaders

    enhancement feature performance 
    opened by Noofbiz 0
  • Use Shapes to make images from SVG

    Use Shapes to make images from SVG

    An SVG is actually just a collection of shapes, and we have methods to create all the shapes needed to fully implement the SVG 2.0 spec. So, rather than saving an SVG to an image.Image and then uploading it as a texture (which is how SVG support works at the moment), we can draw the SVG via shapes.

    enhancement feature 
    opened by Noofbiz 0
  • v1.0.5(Jun 20, 2020)

    engo v1.0.5

    This minor version has small bug fixes, updated the glfw build to use GLFW 3.3,

    • fixes to common.AudioSystem's usage of oto
    • update to go1.13.x
    • common.RenderComponent now has a field for StartingZIndex, so SetZIndex doesn't need to be immediately called just after creation all the time
    • depreciated gopherjs in favor of wasm
    • a TextureAtlas added to common, as well as support for TexturePacker file types
    Source code(tar.gz)
    Source code(zip)
  • v1.0.4(Apr 6, 2019)

  • v1.0.3(Mar 1, 2019)

    • Uses GLFW 3.2
    • Sprite sheets are now automatically batched by the default shader
    • Blendmaps support has been added, as well as a demo on how to use it
    • WASM support added (still experimental!)
    Source code(tar.gz)
    Source code(zip)
  • v1.0.2(Dec 12, 2018)

    Before switching to GLFW 3.2

    This version still uses GLFW 3.1!

    Changes since v1.0.1

    • WASM support added by using gopherwasm/js to bridge gopherjs and WASM
    • Window is now exported in GLFW and SDL so people can make Vulkan based render systems.
    • Render System now has sprite batch drawing. This significantly reduced the number of draw calls.
    Source code(tar.gz)
    Source code(zip)
  • v1.0.1(Nov 4, 2018)

    This is engo before the switch to gopherwasm for wasm support. This version is used with https://github.com/EngoEngine/gl/releases/tag/v1.0.1 or earlier.


    • Text rendering
    • TMX Maps
    • Audio no longer blocks the update loop when being written to, but is also no longer synced with the game time.
    Source code(tar.gz)
    Source code(zip)
  • v1.0(May 26, 2018)

    Engo v1.0 is now available! Grab this if you want to use it in your games without dealing with changes due to recent developments.

    Changes since the beginning to v1.0

    • Demos now require the build tag demo. This is so you can easily go get engo.io/engo ./... without waiting on building all the demos.
    • SetHeadless() was removed as it never actually did anything. It would set the opion but then it would be reset when Run was called.
    • engo.PreloadedSpriteSingle is now engo.LoadedSprite
    • engo.Files.Load and engo.Files.LoadMany have been merged into one function engo.Files.Load which does the same thing as engo.Files.LoadMany allowing an indefinite ammount of parameters to be passed in.
    • engo has been split in engo (which contains stuff about creating windows, starting the game, creating an OpenGL context, input handling, etc.) - and common (which contains a lot of common System implementations for common tasks (RenderSystem, CameraSystem, AudioSystem, etc.)
    • engo.Width() and engo.Height() have been changed to engo.GameWidth() and engo.GameHeight() respectively.
    • RenderComponent.Scale is now no longer a method, but a variable you can change / access directly.
    • engo.NewRenderComponent was removed. You can now define the values you want directly by using engo.RenderComponent{}. Note that the Drawable is still required.
    • ecs.Entity changed to ecs.BasicEntity, world.AddEntity is gone - a lot has changed here. The entire issue is described here, while this comment in particular, should help you migrate your code.
    • Renamed engo.io/webgl to engo.io/gl, because the package handles more than only webgl.
    • github.com/EngoEngine/engo -> engo.io/engo - Our packages engo, ecs and gl should now be imported using the engo.io path.
    • engi.XXX -> engo.XXX - We renamed our package engi to engo.
    Source code(tar.gz)
    Source code(zip)
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