blur: add probe to check compositor for ext-bg-effect

core/cmd/dms/commands_blur.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/blur"
+	"github.com/spf13/cobra"
+)
+
+var blurCmd = &cobra.Command{
+	Use:   "blur",
+	Short: "Background blur utilities",
+}
+
+var blurCheckCmd = &cobra.Command{
+	Use:   "check",
+	Short: "Check if the compositor supports background blur (ext-background-effect-v1)",
+	Args:  cobra.NoArgs,
+	Run:   runBlurCheck,
+}
+
+func init() {
+	blurCmd.AddCommand(blurCheckCmd)
+}
+
+func runBlurCheck(cmd *cobra.Command, args []string) {
+	supported, err := blur.ProbeSupport()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	switch supported {
+	case true:
+		fmt.Println("supported")
+	default:
+		fmt.Println("unsupported")
+	}
+}

core/cmd/dms/commands_common.go

@@ -525,5 +525,6 @@ func getCommonCommands() []*cobra.Command {
 		configCmd,
 		dlCmd,
 		randrCmd,
+		blurCmd,
 	}
 }

core/internal/blur/probe.go

@@ -0,0 +1,35 @@
+package blur
+
+import (
+	wlhelpers "github.com/AvengeMedia/DankMaterialShell/core/internal/wayland/client"
+	client "github.com/AvengeMedia/DankMaterialShell/core/pkg/go-wayland/wayland/client"
+)
+
+const extBackgroundEffectInterface = "ext_background_effect_manager_v1"
+
+func ProbeSupport() (bool, error) {
+	display, err := client.Connect("")
+	if err != nil {
+		return false, err
+	}
+	defer display.Context().Close()
+
+	registry, err := display.GetRegistry()
+	if err != nil {
+		return false, err
+	}
+
+	found := false
+	registry.SetGlobalHandler(func(e client.RegistryGlobalEvent) {
+		switch e.Interface {
+		case extBackgroundEffectInterface:
+			found = true
+		}
+	})
+
+	if err := wlhelpers.Roundtrip(display, display.Context()); err != nil {
+		return false, err
+	}
+
+	return found, nil
+}