README
¶
G3N - Go 3D Game Engine
G3N (pronounced "gen") is an OpenGL 3D Game Engine written in Go. It can be used to write cross-platform Go applications that show rich and dynamic 3D representations - not just games. A basic integrated GUI framework is provided, and 3D spatial audio is supported through OpenAL.
To see G3N in action try the G3N demo or the Gokoban award winning game.
Highlighted Projects
Gokoban - 3D Puzzle Game (1st place in the 2017 Gopher Game Jam)
Dependencies
Go 1.8+ is required. The engine also requires the system to have an OpenGL driver and a GCC-compatible C compiler.
On Unix-based systems the engine depends on some C libraries that can be installed using the appropriate distribution package manager. See below for OS specific requirements.
Ubuntu/Debian-like
$ sudo apt-get install xorg-dev libgl1-mesa-dev libopenal1 libopenal-dev libvorbis0a libvorbis-dev libvorbisfile3
Fedora
$ sudo dnf -y install xorg-x11-proto-devel mesa-libGL mesa-libGL-devel openal-soft openal-soft-devel libvorbis libvorbis-devel glfw-devel libXi-devel
CentOS 7
Enable the EPEL repository:
$ sudo yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
Then install the same packages as for Fedora - remember to use yum instead of dnf for the package installation command.
Windows
The necessary audio libraries sources and DLLs are supplied but they need to be installed manually. Please see Audio libraries for Windows for details. We tested the Windows build using the mingw-w64 toolchain (you can download this file in particular).
macOS
Install the development files of OpenAL and Vorbis using Homebrew:
brew install libvorbis openal-soft
Installation
The following command will download and install the engine along with all its Go dependencies:
go get -u github.com/g3n/engine/...
Features
- Cross-platform: Windows, Linux, and macOS
- Integrated GUI (graphical user interface) with many widgets
- Hierarchical scene graph - nodes can contain other nodes
- 3D spatial audio via OpenAL (.wav, .ogg)
- Real-time lighting: ambient, directional, point, and spot lights
- Physically-based rendering: fresnel reflectance, geometric occlusion, microfacet distribution
- Model loaders: glTF (.gltf, .glb), Wavefront OBJ (.obj), and COLLADA (.dae)
- Geometry generators: box, sphere, cylinder, torus, etc...
- Geometries support morph targets and multimaterials
- Support for animated sprites based on sprite sheets
- Perspective and ortographic cameras
- Text image generation and support for TrueType fonts
- Image textures can be loaded from GIF, PNG or JPEG files
- Animation framework for position, rotation, and scale of objects
- Support for user-created GLSL shaders: vertex, fragment, and geometry shaders
- Integrated basic physics engine (experimental/incomplete)
- Support for HiDPI displays
Hello G3N
The code below is a basic "hello world" application
(hellog3n)
that shows a blue torus.
You can download and install hellog3n via:
go get -u github.com/g3n/demos/hellog3n
For more complex demos please see the G3N demo program.
package main
import (
"github.com/g3n/engine/util/application"
"github.com/g3n/engine/geometry"
"github.com/g3n/engine/material"
"github.com/g3n/engine/math32"
"github.com/g3n/engine/graphic"
"github.com/g3n/engine/light"
)
func main() {
app, _ := application.Create(application.Options{
Title: "Hello G3N",
Width: 800,
Height: 600,
})
// Create a blue torus and add it to the scene
geom := geometry.NewTorus(1, .4, 12, 32, math32.Pi*2)
mat := material.NewPhong(math32.NewColor("DarkBlue"))
torusMesh := graphic.NewMesh(geom, mat)
app.Scene().Add(torusMesh)
// Add lights to the scene
ambientLight := light.NewAmbient(&math32.Color{1.0, 1.0, 1.0}, 0.8)
app.Scene().Add(ambientLight)
pointLight := light.NewPoint(&math32.Color{1, 1, 1}, 5.0)
pointLight.SetPosition(1, 0, 2)
app.Scene().Add(pointLight)
// Add an axis helper to the scene
axis := graphic.NewAxisHelper(0.5)
app.Scene().Add(axis)
app.CameraPersp().SetPosition(0, 0, 3)
app.Run()
}
Documentation
The complete engine API reference can be found here: .
There is also the beginning of a Getting Started Guide, and a newly created list of Guides and Tutorials:
Along with those, a good way to learn how to use the engine is to see the source code of G3ND - the G3N demo.
Contributing
If you find a bug or create a new feature you are encouraged to send pull requests!
Community
Join our channel on Gophers Slack (Click here to register for Gophers Slack). It's a great way to have your questions answered quickly by the G3N community.
Directories
¶
| Path | Synopsis |
|---|---|
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Package animation
|
Package animation |
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Package audio contains sub packages for binding to external audio libraries and implements a spatial audio player.
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Package audio contains sub packages for binding to external audio libraries and implements a spatial audio player. |
|
al
Package al implements the Go bindings of a subset of the functions of the OpenAL C library.
|
Package al implements the Go bindings of a subset of the functions of the OpenAL C library. |
|
ov
Package ov implements the Go bindings of a subset of the functions of the Ogg Vorbis File C library.
|
Package ov implements the Go bindings of a subset of the functions of the Ogg Vorbis File C library. |
|
vorbis
Package vorbis implements the Go bindings of a subset (only one function) of the functions of the libvorbis library See API reference at: https://xiph.org/vorbis/doc/libvorbis/reference.html
|
Package vorbis implements the Go bindings of a subset (only one function) of the functions of the libvorbis library See API reference at: https://xiph.org/vorbis/doc/libvorbis/reference.html |
|
Package camera contains common camera types used for rendering 3D scenes.
|
Package camera contains common camera types used for rendering 3D scenes. |
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control
Package control implements controllers for cameras
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Package control implements controllers for cameras |
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Package core implements some basic types used by other packages.
|
Package core implements some basic types used by other packages. |
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experimental
|
|
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collision
Package collision implements collision related algorithms and data structures.
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Package collision implements collision related algorithms and data structures. |
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physics
Package collision implements collision related algorithms and data structures.
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Package collision implements collision related algorithms and data structures. |
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physics/constraint
Package constraint implements physics constraints.
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Package constraint implements physics constraints. |
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physics/equation
Package equation implements SPOOK equations based on the 2007 PhD thesis of Claude Lacoursière titled "Ghosts and Machines: Regularized Variational Methods for Interactive Simulations of Multibodies with Dry Frictional Contacts"
|
Package equation implements SPOOK equations based on the 2007 PhD thesis of Claude Lacoursière titled "Ghosts and Machines: Regularized Variational Methods for Interactive Simulations of Multibodies with Dry Frictional Contacts" |
|
physics/solver
Package physics implements a basic physics engine.
|
Package physics implements a basic physics engine. |
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Package geometry implements several primitive geometry generators.
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Package geometry implements several primitive geometry generators. |
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Package gls implements a loader of OpenGL functions for the platform and a Go binding for selected OpenGL functions.
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Package gls implements a loader of OpenGL functions for the platform and a Go binding for selected OpenGL functions. |
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Package graphic implements scene objects which have a graphic representation.
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Package graphic implements scene objects which have a graphic representation. |
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Package gui implements the GUI infraestructure and several widgets.
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Package gui implements the GUI infraestructure and several widgets. |
|
assets
Code generated by go-bindata.
|
Code generated by go-bindata. |
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Package light contains common light types which can be add to a 3D scene to illuminate it.
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Package light contains common light types which can be add to a 3D scene to illuminate it. |
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loader
|
|
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collada
Package collada
|
Package collada |
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gltf
Package gltf
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Package gltf |
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obj
Package obj is used to parse the Wavefront OBJ file format (*.obj), including associated materials (*.mtl).
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Package obj is used to parse the Wavefront OBJ file format (*.obj), including associated materials (*.mtl). |
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Package material contains several types of materials which can be used to set the appearance of graphic object
|
Package material contains several types of materials which can be used to set the appearance of graphic object |
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Package math32 implements basic math functions which operate directly on float32 numbers without casting and contains types of common entities used in 3D Graphics such as vectors, matrices, quaternions and others.
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Package math32 implements basic math functions which operate directly on float32 numbers without casting and contains types of common entities used in 3D Graphics such as vectors, matrices, quaternions and others. |
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Package renderer implements the scene renderer.
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Package renderer implements the scene renderer. |
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shaders
Package shaders contains the several shaders used by the engine
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Package shaders contains the several shaders used by the engine |
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Package text implements text font support.
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Package text implements text font support. |
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Package texture contains several types of textures which can be added to materials.
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Package texture contains several types of textures which can be added to materials. |
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tools
|
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g3nshaders
g3nshaders reads shaders files with ".glsl" extensions and generates a Go file containing strings with the content of these files.
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g3nshaders reads shaders files with ".glsl" extensions and generates a Go file containing strings with the content of these files. |
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util
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logger
Package logger implements an hierarchical logger used by other packages.
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Package logger implements an hierarchical logger used by other packages. |
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Package window abstracts the OpenGL Window manager Currently only "glfw" is supported
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Package window abstracts the OpenGL Window manager Currently only "glfw" is supported |
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