Now BGM only loads if it exists

load/bgm.lua

@@ -1,10 +1,30 @@
-bgm = {
+bgm_paths = {
 	credit_roll = {
-		gm3 = love.audio.newSource("res/bgm/tgm_credit_roll.mp3", "stream"),
+		gm3 = "res/bgm/tgm_credit_roll.mp3",
 	},
-	pacer_test = love.audio.newSource("res/bgm/pacer_test.mp3", "stream"),
+	pacer_test = "res/bgm/pacer_test.mp3",
 }
 
+bgm = {}
+
+for k,v in pairs(bgm_paths) do
+	if(type(v) == "table") then
+		-- list of subsounds
+		for k2,v2 in pairs(v) do
+			if(love.filesystem.getInfo(v2)) then
+				-- this file exists
+				bgm[k] = bgm[k] or {}
+				bgm[k][k2] = love.audio.newSource(v2, "stream")
+			end
+		end
+	else
+		if(love.filesystem.getInfo(v)) then
+			-- this file exists
+			bgm[k] = love.audio.newSource(v, "stream")
+		end
+	end
+end
+
 local current_bgm = nil
 local bgm_locked = false