vova616 / garageengine

Game engine written in Go (golang).

GarageEngine

This is a 2d game engine written in Go working on OpenGL. Its an Entity/Component based engine and right now contains lots of features such as: Font,Sprites,Texture packing,Physics,Depth layers,Scenes and more. It feels like Unity3d and share the same names: Scene,Coroutines,Components,Transform,GameObjects etc...

This is an educational project, I'm learning as I go, I cannot promise backwards compatibility at this point.
the name will be probably changed.

Install:

You need to download glfw&glew libraries.

Windows: Use mingw and compile glew.

Linux:
sudo apt-get update
sudo apt-get install build-essential binutils-gold freeglut3 freeglut3-dev libglew-dev libglfw-dev libxrandr2 libxrandr-dev libglew libglew1.8

go get github.com/vova616/GarageEngine

To-Do list

Clean project:
Name changing Engine -> engine etc...
Function changing -> SetWorldPositionf -> SetWorldPosition2d etc...

Atlas,Font - Clean whatever we can.
Material - Think of design that does not require lots of work when creating custom shaders.
Physics - Think of a better design for arbiter and clean & polish stuff.
Scene - Get scene by name.
Tree Behaviours - Clean & polish & new features.
Camera - support multiple cameras.
Rendering - support auto-batching.
Coroutine - try to fix the bug that you cannot access to textures in Coroutines.
Readme - explain Tree Behaviours.
Learn from - https://github.com/runningwild/haunts .
Comments - lacks tons of it.

Dependencies

github.com/go-gl/gl
github.com/go-gl/glfw
github.com/vova616/chipmunk
"github.com/vova616/freetype-go/freetype"

Coroutines(they might be deprecated):

The useage is same as unity coroutines.
Use Behaviour Trees, its better and faster.

Behaviour Trees:

Example in SpaceCookies/game/EnemeyAI.go

SpaceCookies

Mini game to test the engine, it will host server on port 123 then you connect to it. Make sure your executable file is in the same folder with the data folder.

Videos:

http://www.youtube.com/watch?v=iMMbf6SRb9Q
http://www.youtube.com/watch?v=BMRlY9dFVLg

Coroutines Example:

func (sp *PlayerController) Start() {
	as := StartCoroutine(func() { sp.AutoShoot() })
	
	StartCoroutine(func() {
		cr.Sleep(3)
		cr.YieldCoroutine(as) //wait for as to finish
		for i := 0; i < 10; i++ {
			cr.Skip()
			cr.Skip()
			cr.Skip()
			sp.Shoot()
		}
	})
}

func (sp *PlayerController) AutoShoot() {
	for i := 0; i < 3; i++ {
		cr.Sleep(3)
		sp.Shoot()
	}
}

func (sp *PlayerController) AutoShoot2() {
	for i := 0; i < 3; i++ {
		for i:=0;i<3*60;i++ {
			cr.Skip() //Frame skip
		}
		sp.Shoot()
	}
}

func (sp *PlayerController) AutoShoot3() {
	for i := 0; i < 3; i++ {
		done := make(chan bool)
		go func() {
			<-time.After(time.Second * 3)
			done <- true
		}() 
		cr.YieldUntil(done)
		sp.Shoot()
	}
} 

garageengine's Issues

Problems with gl.Texture ang gl.GLenum

Problems with texture and glenum

I have updated the repo to use:
github.com/go-gl/gl/v2.1/gl

But using it version or other, i always got:

engine/Texture.go:109: undefined: gl.Texture
engine/Texture.go:112: undefined: gl.GLenum
engine/Texture.go:113: undefined: gl.GLenum
engine/Texture.go:115: undefined: gl.GLenum

What i need change to make it work and make a pull-request?

Dependencies have changed?

SpaceCookies looks fun! Just watched the video on YouTube. However...

When installing the dependencies with go get -d in a freshly checked out revision of GarageEngine, I get:

go get -d
engine/Atlas.go:5:2: no buildable Go source files in /home/afr/go/src/github.com/go-gl/gl
engine/Engine.go:11:2: no buildable Go source files in /home/afr/go/src/github.com/go-gl/glfw

More information:

GOPATH=/home/afr/go
go version go1.6 linux/amd64

I see that https://github.com/go-gl/gl seems to import specific versions of the packages.

Are there additional steps I need to take when installing the Go dependencies for GarageEngine?

Redesign Activity in GameObjects.

Remove SetActiveRecursive.
The parent will control the whole activity of his children, if the parent is inactive all his children will be inactive too.
This will solve some problems and make the flow easier.

engine/audio is broken

# github.com/vova616/GarageEngine/engine/audio
./AudioSource.go:129: undefined: openal.DistanceModel

Instructions for running on OS X with homebrew?

Better GameObject container design.

Put all of the GameObjects in one array, only the transform will know the relations.
It will vastly increase the performance and solve tons of bugs, but we lose order of GameObjects execution we have now. (its not a problem we could add support for this in the future where we just rearrange the array.)