fix linting errors

config.go

@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -81,7 +82,7 @@ func InitConfig() (*Config, error) {
 	// setup custom usage
 	flagset := flag.NewFlagSet("config", flag.ContinueOnError)
 	flagset.Usage = func() {
-		fmt.Println(Usage)
+		_, _ = fmt.Println(Usage)
 		os.Exit(0)
 	}
 
@@ -165,13 +166,13 @@ func SanitiyCheck(conf *Config) error {
 
 	geo := strings.Split(conf.Geo, "x")
 	if len(geo) != 2 {
-		return fmt.Errorf(geoerr)
+		return errors.New(geoerr)
 	}
 
 	w, errw := strconv.Atoi(geo[0])
 	h, errh := strconv.Atoi(geo[1])
 	if errw != nil || errh != nil {
-		return fmt.Errorf(geoerr)
+		return errors.New(geoerr)
 	}
 
 	conf.Width = w
@@ -195,11 +196,3 @@ func SanitiyCheck(conf *Config) error {
 
 	return nil
 }
-
-func fileExists(filename string) bool {
-	info, err := os.Stat(filename)
-	if os.IsNotExist(err) {
-		return false
-	}
-	return !info.IsDir()
-}

game.go

@@ -46,7 +46,9 @@ func LoadImage(name string) (*ebiten.Image, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer fd.Close()
+	defer func() {
+		_ = fd.Close()
+	}()
 
 	img, _, err := image.Decode(fd)
 	if err != nil {
@@ -89,7 +91,7 @@ func (game *Game) Init() error {
 	game.Shader = shader
 
 	// user can customize TPS
-	ebiten.SetMaxTPS(game.Conf.TPS)
+	ebiten.SetTPS(game.Conf.TPS)
 
 	// setup shader bounds, by default we use window size
 	game.ShaderBounds = image.Rect(0, 0, game.Conf.Width, game.Conf.Height)

main.go

@@ -64,7 +64,7 @@ func main() {
 
 	ebiten.SetWindowSize(game.Conf.Width, game.Conf.Height)
 	ebiten.SetWindowTitle("Kage shader viewer")
-	ebiten.SetWindowResizable(true)
+	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
 
 	if err := ebiten.RunGame(game); err != nil {
 		log.Fatal(err)