todo

util/fb/fb.go

@@ -5,9 +5,12 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	"io"
 	"os"
+	"path/filepath"
 )
 
+/* old version that worked some time for some reason
 func Resolution() (w int, h int) {
 	resFile, err := os.Open("/sys/class/graphics/fb0/virtual_size")
 	if err != nil {
@@ -22,6 +25,33 @@ func Resolution() (w int, h int) {
 	fmt.Sscanf(s, "%d,%d", &w, &h)
 	return
 }
+*/
+
+func Resolution() (w int, h int) {
+	matches, err := filepath.Glob("sys/class/drm/*/modes")
+	if err != nil {
+		panic(err)
+	}
+
+	for _, match := range matches {
+		f, err := os.Open(match)
+		if err != nil {
+			panic(err)
+		}
+		r := bufio.NewReader(f)
+		s, err := r.ReadString('\n')
+		if err != nil {
+			switch err {
+			case io.EOF:
+				continue
+			default:
+				panic(err)
+			}
+		}
+		fmt.Sscanf(s, "%dx%d", &w, &h)
+	}
+	return
+}
 
 var devfb *os.File
 var width, height = Resolution()
@@ -53,7 +83,7 @@ func Draw(img image.Image) error {
 	if err != nil {
 		return err
 	}
-	_, err := devfb.Seek(0,0)
+	_, err = devfb.Seek(0, 0)
 	if err != nil {
 		return err
 	}

util/fb/filepath.go

@@ -0,0 +1,36 @@
+//go:build ignore
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	matches, err := filepath.Glob("/sys/class/drm/*/modes")
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(matches)
+	for _, match := range matches {
+		f, err := os.Open(match)
+		if err != nil {
+			panic(err)
+		}
+		r := bufio.NewReader(f)
+		s, err := r.ReadString('\n')
+		if err != nil {
+			switch err {
+			case io.EOF:
+				continue
+			default:
+				panic(err)
+			}
+		}
+		fmt.Print(s)
+	}
+}