ReShade: Use ALTEXEPATH to install ReShade DLLs for Custom Commands…

… with `ONLY_CUSTOMCMD=1` (#1092)

steamtinkerlaunch

@@ -7,7 +7,7 @@
 PREFIX="/usr"
 PROGNAME="SteamTinkerLaunch"
 NICEPROGNAME="Steam Tinker Launch"
-PROGVERS="v14.0.20240421-1"
+PROGVERS="v14.0.20240423-1"
 PROGCMD="${0##*/}"
 PROGINTERNALPROTNAME="Proton-stl"
 SHOSTL="stl"
@@ -9132,8 +9132,11 @@ function ShaderRepoDialog {
 
 function setFullGameExePath {
 	if [[ ( "$USECUSTOMCMD" -eq 1 && -f "$CUSTOMCMD" && "$CUSTOMCMDRESHADE" -eq 1 ) || "$ONLY_CUSTOMCMD" -eq 1 ]]; then
-		FGEP="${CUSTOMCMD%/*}"
-
+		# Use Alternative EXE Path if defined instead of custom command path
+		# We should only use the custom command directory if no alternatiive EXE path is defined, and
+		# we should prioritise the alt path if it is defined
+		DEFINEDALTEXEPATH="$(GETALTEXEPATH)"
+		FGEP="${DEFINEDALTEXEPATH:-${CUSTOMCMD%/*}}"
 		writelog "INFO" "${FUNCNAME[0]} - Using the directory '$FGEP' of the used custom command as absolute game exe path"
 
 		if [ "$CUSTOMCMDRESHADE" -eq 1 ]; then
@@ -9582,7 +9585,7 @@ function installRSdll {
 function installReshade {
 	if [ "$USERESHADE" -eq 1 ]; then
 		prepareReshadeFiles
-		setShadDestDir
+		setShadDestDir  # Have to use setShadDestDir because setShadDest will use ABSGAMEEXEPATH which is not Custom Command 
 
 		INSTDESTDIR="$SHADDESTDIR"