Add Golang-based Gio example code

Golang and Gio should be considered as an alternative to the current C-
and SDL-based setup.

3 files changed, 100 insertions, 0 deletions

diff --git a/go/go.mod b/go/go.mod
new file mode 100644
index 0000000..de2e3d7
--- /dev/null
+++ b/go/go.mod
@@ -0,0 +1,17 @@
+module xengineering.eu/limox
+
+go 1.20
+
+require gioui.org v0.0.0-20230206180804-32c6a9b10d0b
+
+require (
+	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 // indirect
+	gioui.org/shader v1.0.6 // indirect
+	github.com/benoitkugler/textlayout v0.3.0 // indirect
+	github.com/go-text/typesetting v0.0.0-20221214153724-0399769901d5 // indirect
+	golang.org/x/exp v0.0.0-20221012211006-4de253d81b95 // indirect
+	golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91 // indirect
+	golang.org/x/image v0.0.0-20220722155232-062f8c9fd539 // indirect
+	golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64 // indirect
+	golang.org/x/text v0.3.7 // indirect
+)
diff --git a/go/go.sum b/go/go.sum
new file mode 100644
index 0000000..4d42bf4
--- /dev/null
+++ b/go/go.sum
@@ -0,0 +1,34 @@
+eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3 h1:djFprmHZgrSepsHAIRMp5UJn3PzsoTg9drI+BDmif5Q=
+gioui.org v0.0.0-20230206180804-32c6a9b10d0b h1:ghRvtb24ItyA7QffjaG38gH5f7bzagcz0OPq3T3FyHI=
+gioui.org v0.0.0-20230206180804-32c6a9b10d0b/go.mod h1:3lLo7xMHYnnHTrgKNNctBjEKKH3wQCO2Sn7ti5Jy8mU=
+gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
+gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJGFDjINIPi1jtO6pc=
+gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
+gioui.org/shader v1.0.6 h1:cvZmU+eODFR2545X+/8XucgZdTtEjR3QWW6W65b0q5Y=
+gioui.org/shader v1.0.6/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
+github.com/benoitkugler/pstokenizer v1.0.0/go.mod h1:l1G2Voirz0q/jj0TQfabNxVsa8HZXh/VMxFSRALWTiE=
+github.com/benoitkugler/textlayout v0.3.0 h1:2ehWXEkgb6RUokTjXh1LzdGwG4dRP6X3dqhYYDYhUVk=
+github.com/benoitkugler/textlayout v0.3.0/go.mod h1:o+1hFV+JSHBC9qNLIuwVoLedERU7sBPgEFcuSgfvi/w=
+github.com/benoitkugler/textlayout-testdata v0.1.1 h1:AvFxBxpfrQd8v55qH59mZOJOQjtD6K2SFe9/HvnIbJk=
+github.com/benoitkugler/textlayout-testdata v0.1.1/go.mod h1:i/qZl09BbUOtd7Bu/W1CAubRwTWrEXWq6JwMkw8wYxo=
+github.com/go-text/typesetting v0.0.0-20221214153724-0399769901d5 h1:iOA0HmtpANn48hX2nlDNMu0VVaNza35HJG0WeetBVzQ=
+github.com/go-text/typesetting v0.0.0-20221214153724-0399769901d5/go.mod h1:/cmOXaoTiO+lbCwkTZBgCvevJpbFsZ5reXIpEJVh5MI=
+golang.org/x/exp v0.0.0-20221012211006-4de253d81b95 h1:sBdrWpxhGDdTAYNqbgBLAR+ULAPPhfgncLr1X0lyWtg=
+golang.org/x/exp v0.0.0-20221012211006-4de253d81b95/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
+golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91 h1:ryT6Nf0R83ZgD8WnFFdfI8wCeyqgdXWN4+CkFVNPAT0=
+golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91/go.mod h1:VjAR7z0ngyATZTELrBSkxOOHhhlnVUxDye4mcjx5h/8=
+golang.org/x/image v0.0.0-20210504121937-7319ad40d33e/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d/go.mod h1:023OzeP/+EPmXeapQh35lcL3II3LrY8Ic+EFFKVhULM=
+golang.org/x/image v0.0.0-20220722155232-062f8c9fd539 h1:/eM0PCrQI2xd471rI+snWuu251/+/jpBpZqir2mPdnU=
+golang.org/x/image v0.0.0-20220722155232-062f8c9fd539/go.mod h1:doUCurBvlfPMKfmIpRIywoHmhN3VyhnoFDbvIEWF4hY=
+golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64 h1:UiNENfZ8gDvpiWw7IpOMQ27spWmThO1RwwdQVbJahJM=
+golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/go/main.go b/go/main.go
new file mode 100644
index 0000000..5c4c213
--- /dev/null
+++ b/go/main.go
@@ -0,0 +1,49 @@
+package main
+
+import (
+	"image/color"
+	"log"
+	"os"
+
+	"gioui.org/app"
+	"gioui.org/font/gofont"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/text"
+	"gioui.org/widget/material"
+)
+
+func main() {
+	go func() {
+		w := app.NewWindow()
+		err := run(w)
+		if err != nil {
+			log.Fatal(err)
+		}
+		os.Exit(0)
+	}()
+	app.Main()
+}
+
+func run(w *app.Window) error {
+	th := material.NewTheme(gofont.Collection())
+	var ops op.Ops
+	for {
+		e := <-w.Events()
+		switch e := e.(type) {
+		case system.DestroyEvent:
+			return e.Err
+		case system.FrameEvent:
+			gtx := layout.NewContext(&ops, e)
+
+			title := material.H1(th, "Hello, Gio")
+			maroon := color.NRGBA{R: 127, G: 0, B: 0, A: 255}
+			title.Color = maroon
+			title.Alignment = text.Middle
+			title.Layout(gtx)
+
+			e.Frame(gtx.Ops)
+		}
+	}
+}