gpu: [compute] skip encoding roundtrip for path data

Since clip.Path now encodes paths in the format expected by
elements.comp, use that data directly instead of a roundtrip through
drawOps.buildVerts.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/ops/ops.go

@@ -18,6 +18,10 @@ func DecodeCommand(d []byte) scene.Command {
 	return cmd
 }
 
+func EncodeCommand(out []byte, cmd scene.Command) {
+	copy(out, byteslice.Uint32(cmd[:]))
+}
+
 func DecodeTransform(data []byte) (t f32.Affine2D) {
 	if opconst.OpType(data[0]) != opconst.TypeTransform {
 		panic("invalid op")