This repository holds Go bindings to various OpenGL versions. They are auto-generated using Glow.
Features:
- Go functions that mirror the C specification using Go types.
- Support for multiple OpenGL APIs (GL/GLES/EGL/WGL/GLX/EGL), versions, and profiles.
- Support for extensions (including debug callbacks).
Requirements:
- A cgo compiler (typically gcc).
- On Ubuntu/Debian-based systems, the
libgl1-mesa-dev
package.
Use go get -u
to download and install the prebuilt packages. The prebuilt packages support OpenGL versions 2.1, 3.1, 3.2, 3.3, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 across both the core and compatibility profiles and include all extensions. Pick whichever one(s) you need:
go get -u github.com/go-gl/gl/v{3.2,3.3,4.1,4.2,4.3,4.4,4.5,4.6}-{core,compatibility}/gl
go get -u github.com/go-gl/gl/v3.1/gles2
go get -u github.com/go-gl/gl/v2.1/gl
Once the bindings are installed you can use them with the appropriate import statements.
import "github.com/go-gl/gl/v3.3-core/gl"
func main() {
window := ... // Open a window.
window.MakeContextCurrent()
// Important! Call gl.Init only under the presence of an active OpenGL context,
// i.e., after MakeContextCurrent.
if err := gl.Init(); err != nil {
log.Fatalln(err)
}
}
The gl
package contains the OpenGL functions and enumeration values for the imported version. It also contains helper functions for working with the API. Of note is gl.Ptr
which takes a Go array or slice or pointer and returns a corresponding uintptr
to use with functions expecting data pointers. Also of note is gl.Str
which takes a null-terminated Go string and returns a corresponding *int8
to use with functions expecting character pointers.
A note about threading and goroutines. The bindings do not expose a mechanism to make an OpenGL context current on a different thread so you must restrict your usage to the thread on which you called gl.Init()
. To do so you should use LockOSThread.
Examples illustrating how to use the bindings are available in the example repo. There are examples for OpenGL 4.1 core and OpenGL 2.1.
The procaddr
package contains platform-specific functions for loading OpenGL functions. Calling gl.Init()
uses the auto
subpackage to automatically select an appropriate implementation based on the build environment. If you want to select a specific implementation you can use the noauto
build tag and the gl.InitWithProcAddrFunc
initialization function.
These gl bindings are generated using the Glow generator. Only developers of this repository need to do this step.
It is required to have glow
source in the same Go workspace (since relative paths are used) and the glow
binary should be in your $PATH
. Doable with go get -u github.com/go-gl/glow
if your $GOPATH/bin
is in your $PATH
.
go generate -tags=gen github.com/go-gl/gl
More information about these bindings can be found in the Glow repository.