no required module provides package SDL2

Question

I am trying to import sdl2 package from https://github.com/veandco/go-sdl2. I followed all the steps that appear on readme.md for Windows. Installing mingw64 and do on cmd:

go get -v github.com/veandco/go-sdl2/sdl

It works okay, but when I tried to do:

go run .\sdl2.go

I got this error:

sdl2.go:4:2: no required module provides package github.com/veandco/go-sdl2/sdl: working directory is not part of a module

In my other computer works perfect but when I clone this repository and install the package on the other laptop I had a lot of issues. To get more info about the case I put my test source here to brig more information:

package main

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

const winWidth, winHeight int = 800, 600



type color struct {
    r, g, b byte
}

func setPixel(x, y int, c color, pixels []byte) {
    index := (y * winWidth + x) * 4

    if index < len(pixels)-4 && index >= 0 {
    pixels[index] = c.r
    pixels[index+1] = c.g
    pixels[index+2] = c.b
    }
}

func main() {
    winWidth := 800
    winHeight := 600

    window,err := sdl.CreateWindow("Testing SDL2", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
        int32(winWidth) ,int32(winHeight), sdl.WINDOW_SHOWN)
    if err != nil {
        fmt.Println(err)
        return 
    }
    defer window.Destroy()

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

    tex, err  := renderer.CreateTexture(sdl.PIXELFORMAT_ABGR8888, sdl.TEXTUREACCESS_STREAMING, int32(winWidth), int32(winHeight))
    if err != nil {
        fmt.Println(err)
        return
    }
    defer tex.Destroy()

    pixels := make([]byte, winWidth*winHeight*4)

    for y := 0; y < winHeight; y++ {
        for x := 0; x < winWidth; x++ {
            setPixel(x,y, color{byte(x % 255),byte(y % 255), 0}, pixels)
        }
    }
    tex.Update(nil,pixels,winWidth*4)
    renderer.Copy(tex,nil,nil)
    renderer.Present()

    sdl.Delay(2000)

} 

Answer 1

According to New module changes in Go 1.16 blog

The go command now builds packages in module-aware mode by default, even when no go.mod is present. This is a big step toward using modules in all projects.

as suggested in the blog change the value for GO111MODULE to auto go env -w GO111MODULE=auto would fix the issue.