main.go

package main

import (
	"unsafe"

	"github.com/veandco/go-sdl2/sdl"
)

func main() {
	const w = 640
	const h = 480
	sdl.Init(sdl.INIT_VIDEO)

	window, err := sdl.CreateWindow("Cube", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
		w, h, sdl.WINDOW_SHOWN)
	if err != nil {
		panic(err)
	}
	defer window.Destroy()

	renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
	if err != nil {
		panic(err)
	}
	defer renderer.Destroy()

	texture, err := renderer.CreateTexture(sdl.PIXELFORMAT_ARGB8888, sdl.TEXTUREACCESS_STREAMING,
		w, h)
	if err != nil {
		panic(err)
	}
	defer texture.Destroy()

	var pixels unsafe.Pointer
	var pitch int
	err = texture.Lock(nil, &pixels, &pitch)
	if err != nil {
		panic(err)
	}
	for x := 0; x < w; x++ {
		for y := 0; y < h; y++ {
			(*[w * h]uint32)(pixels)[y*(pitch/4)+x] = 0xFF00FF // whatever color you want
		}
	}
	texture.Update(nil, pixels, pitch)
	texture.Unlock()

	renderer.Clear()
	renderer.Copy(texture, nil, nil)
	renderer.Present()

	sdl.Delay(1000)
}