support common picom options

toggle-bw.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+PICOM_OPTIONS="--backend glx"
+
 # pgrep returns 0 if a matching process is found, 1 if not.
 # Thus 1 means there is either a picom process without b/w filter running,
 # or none at all. Either way, display is coloured when return code is 1.
@@ -7,7 +9,7 @@ pgrep -fa gl_FragColor &>/dev/null
 if [ $? -eq 1 ];
 then
 	pkill picom
-	picom --backend glx --glx-fshader-win \
+	picom ${PICOM_OPTIONS} --glx-fshader-win \
 		"uniform sampler2D tex;
 		uniform float opacity;
 		void main() {
@@ -16,5 +18,5 @@ then
 		}" &
 else
 	pkill picom
-	picom &
+	picom ${PICOM_OPTIONS} &
 fi