rpi_sdl_test.go

package main

import (
	"os"
	"fmt"
	"math/rand"
	"github.com/veandco/go-sdl2/sdl"
)

const (
	WindowTitle = "test"
	WindowWidth = 800
	WindowHeight = 600
)

func run() int {
	var window *sdl.Window
	var renderer *sdl.Renderer
	var err error
	r := rand.New(rand.NewSource(99))

	sdl.Do(func() {
		window, err = sdl.CreateWindow(
			WindowTitle,
			0, 0,
			WindowWidth, WindowHeight,
			sdl.WINDOW_FULLSCREEN,
		)
	})
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", err)
		return 1
	}
	defer func() {
		sdl.Do(func() {
			window.Destroy()
		})
	}()

	sdl.Do(func() {
		renderer, err = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
	})
	if err != nil {
		fmt.Fprint(os.Stderr, "Failed to create renderer: %s\n", err)
		return 2
	}
	defer func() {
		sdl.Do(func() {
			renderer.Destroy()
		})
	}()

	running := true
	for running {
		sdl.Do(func() {
			for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
				switch event.(type) {
					case *sdl.KeyboardEvent:
						running = false
					}
			}
			renderer.Clear()
			renderer.SetDrawColor(uint8(r.Int31n(255)), uint8(r.Int31n(255)), uint8(r.Int31n(255)), 0x80)
			renderer.FillRect(&sdl.Rect{0, 0, WindowWidth, WindowHeight})
			renderer.Present()
		})
	}

	return 0
}

func main() {
	var exitcode int
	sdl.Main(func() {
		exitcode = run()
	})
	os.Exit(exitcode)
}