Addded basic ctrµLua backend, only load backend for loaded modules

backend/ctrulua.lua

@@ -1,2 +1,62 @@
--- TODO: everything
+--- ctrµLua backend 0.0.1 for Abstract.
-error("TODO level over 9000")
+-- Provides a partial abstract API. Still a lot to implement.
+-- Made for some ctrµLua version and abstract 0.0.1.
+-- See `abstract` for Abstract API.
+
+-- General
+local version = "0.0.1"
+
+-- Require stuff
+local abstract = require((...):match("^(.-abstract)%."))
+local ctr = require("ctr")
+local gfx = require("gfx")
+
+-- Version compatibility warning
+do
+	local function checkCompat(stuffName, expectedVersion, actualVersion)
+		if actualVersion ~= expectedVersion then
+			local txt = ("Abstract ctrµLua backend version "..version.." was made for %s %s but %s is used!\nThings may not work as expected.")
+			            :format(stuffName, expectedVersion, actualVersion)
+			print(txt)
+			for i=0,300 do
+				gfx.start(gfx.TOP)
+					gfx.wrappedText(0, 0, txt, gfx.TOP_WIDTH)
+				gfx.stop()
+				gfx.render()
+			end
+		end
+	end
+	-- checkCompat("ctrµLua", "", ("%s.%s.%s"):format(love.getVersion())) -- not really a version, just get the latest build
+	checkCompat("abstract", "0.0.1", abstract.version)
+end
+
+-- Redefine all functions in tbl which also are in toAdd, so when used they call the old function (in tbl) and then the new (in toAdd).
+local function add(tbl, toAdd)
+	for k,v in pairs(toAdd) do
+		local old = tbl[k]
+		tbl[k] = function(...)
+			old(...)
+			return v(...)
+		end
+	end
+end
+
+-- abstract
+abstract.backend = "ctrulua"
+
+-- abstract.event: TODO
+
+-- abstract.draw: TODO
+
+-- abstract.audio: TODO
+
+-- abstract.time
+if abstract.time then
+add(abstract.time, {
+	get = function()
+		return ctr.time() / 1000
+	end
+})
+end
+
+-- abstract.input: TODO

backend/love.lua

@@ -44,7 +44,7 @@ end
 abstract.backend = "love"
 
 -- abstract.event
-do
+if abstract.event then
 local updateDefault = abstract.event.update
 abstract.event.update = function() end
 function love.update(dt)
@@ -83,6 +83,7 @@ end
 end
 
 -- abstract.draw
+if abstract.draw then
 local defaultFont = love.graphics.getFont()
 add(abstract.draw, {
 	init = function(params)
@@ -138,8 +139,10 @@ function love.resize(width, height)
 		abstract.draw.height = height
 	end
 end
+end
 
 -- abstract.audio
+if abstract.audio then
 add(abstract.audio, {
 	-- TODO: doc
 	load = function(filepath)
@@ -151,16 +154,19 @@ add(abstract.audio, {
 		}
 	end
 })
+end
 
 -- abstract.time
+if abstract.time then
 add(abstract.time, {
 	get = function()
 		return love.timer.getTime()
 	end
 })
+end
 
 -- abstract.input
-do
+if abstract.input then
 local buttonsInUse = {}
 local axesInUse = {}
 function love.keypressed(key, scancode, isrepeat)