// +build ignore,OMIT package main import ( "golang.org/x/mobile/app" "golang.org/x/mobile/app/debug" "golang.org/x/mobile/gl" ) func main() { app.Run(app.Callbacks{ Draw: draw, }) } func draw() { gl.ClearColor(1, 0, 0, 1) // RGBA value used to clear buffer: red gl.Clear(gl.COLOR_BUFFER_BIT) debug.DrawFPS() }