Make love.run and love.errhand return a function for their main loop instead (resolves #1268)

This way lua code can stop every iteration (usually frame), and return to the
c++ code, so love can work in environments with co-operative multithreading
like emscripten.

It may be interesting to see if we can make this optional, so this only happens
on platforms that require it, but I doubt it's significant in the grand scheme
of things.

--HG--
branch : minor

src/love.cpp

@@ -252,8 +252,14 @@ static DoneAction runlove(int argc, char **argv, int &retval)
 	lua_pushstring(L, "love.boot");
 	lua_call(L, 1, 1);
 
-	// Call the returned boot function.
-	lua_call(L, 0, 1);
+	// Turn the returned boot function into a coroutine and call it until done.
+	lua_newthread(L);
+	lua_pushvalue(L, -2);
+	int stackpos = lua_gettop(L);
+	while (lua_resume(L, 0) == LUA_YIELD)
+	{
+		lua_pop(L, lua_gettop(L) - stackpos);
+	}
 
 	retval = 0;
 	DoneAction done = DONE_QUIT;

src/scripts/boot.lua

@@ -564,14 +564,14 @@ function love.run()
 	local dt = 0
 
 	-- Main loop time.
-	while true do
+	return function()
 		-- Process events.
 		if love.event then
 			love.event.pump()
 			for name, a,b,c,d,e,f in love.event.poll() do
 				if name == "quit" then
 					if not love.quit or not love.quit() then
-						return a
+						return a or 0
 					end
 				end
 				love.handlers[name](a,b,c,d,e,f)
@@ -700,14 +700,14 @@ function love.errhand(msg)
 		p = p .. "\n\nPress Ctrl+C or tap to copy this error"
 	end
 
-	while true do
+	return function()
 		love.event.pump()
 
 		for e, a, b, c in love.event.poll() do
 			if e == "quit" then
-				return
+				return 1
 			elseif e == "keypressed" and a == "escape" then
-				return
+				return 1
 			elseif e == "keypressed" and a == "c" and love.keyboard.isDown("lctrl", "rctrl") then
 				copyToClipboard()
 			elseif e == "touchpressed" then
@@ -719,7 +719,7 @@ function love.errhand(msg)
 				end
 				local pressed = love.window.showMessageBox("Quit "..name.."?", "", buttons)
 				if pressed == 1 then
-					return
+					return 1
 				elseif pressed == 3 then
 					copyToClipboard()
 				end
@@ -735,22 +735,47 @@ function love.errhand(msg)
 
 end
 
-local function deferErrhand(...)
-	local handler = love.errorhandler or love.errhand or error_printer
-	return handler(...)
-end
-
 -----------------------------------------------------------
 -- The root of all calls.
 -----------------------------------------------------------
 
 return function()
-	local result = xpcall(love.boot, error_printer)
-	if not result then return 1 end
-	local result = xpcall(love.init, deferErrhand)
-	if not result then return 1 end
-	local result, retval = xpcall(love.run, deferErrhand)
-	if not result then return 1 end
-
-	return retval == nil and 0 or retval
+	local func
+	local inerror = false
+
+	local function deferErrhand(...)
+		local errhand = love.errorhandler or love.errhand
+		local handler = (not inerror and errhand) or error_printer
+		inerror = true
+		func = handler(...)
+	end
+
+	local function earlyinit()
+		-- If love.boot fails, return 1 and finish immediately
+		local result = xpcall(love.boot, error_printer)
+		if not result then return 1 end
+
+		-- If love.init or love.run fails, don't return a value,
+		-- as we want the error handler to take over
+		result = xpcall(love.init, deferErrhand)
+		if not result then return end
+
+		-- NOTE: We can't assign to func directly, as we'd
+		-- overwrite the result of deferErrhand with nil on error
+		local main
+		result, main = xpcall(love.run, deferErrhand)
+		if result then
+			func = main
+		end
+	end
+
+	func = earlyinit
+
+	while func do
+		local _, retval = xpcall(func, deferErrhand)
+		if retval then return retval end
+		coroutine.yield()
+	end
+
+	return 1
 end

src/scripts/boot.lua.h

@@ -1044,7 +1044,7 @@ const unsigned char boot_lua[] =
 	0x09, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x20, 0x64, 0x74, 0x20, 0x3d, 0x20, 0x30, 0x0a,
 	0x09, 0x2d, 0x2d, 0x20, 0x4d, 0x61, 0x69, 0x6e, 0x20, 0x6c, 0x6f, 0x6f, 0x70, 0x20, 0x74, 0x69, 0x6d, 0x65, 
 	0x2e, 0x0a,
-	0x09, 0x77, 0x68, 0x69, 0x6c, 0x65, 0x20, 0x74, 0x72, 0x75, 0x65, 0x20, 0x64, 0x6f, 0x0a,
+	0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x28, 0x29, 0x0a,
 	0x09, 0x09, 0x2d, 0x2d, 0x20, 0x50, 0x72, 0x6f, 0x63, 0x65, 0x73, 0x73, 0x20, 0x65, 0x76, 0x65, 0x6e, 0x74, 
 	0x73, 0x2e, 0x0a,
 	0x09, 0x09, 0x69, 0x66, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x20, 0x74, 0x68, 
@@ -1059,7 +1059,8 @@ const unsigned char boot_lua[] =
 	0x09, 0x09, 0x09, 0x09, 0x09, 0x69, 0x66, 0x20, 0x6e, 0x6f, 0x74, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x71, 
 	0x75, 0x69, 0x74, 0x20, 0x6f, 0x72, 0x20, 0x6e, 0x6f, 0x74, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x71, 0x75, 
 	0x69, 0x74, 0x28, 0x29, 0x20, 0x74, 0x68, 0x65, 0x6e, 0x0a,
-	0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x61, 0x0a,
+	0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x61, 0x20, 0x6f, 0x72, 0x20, 
+	0x30, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x09, 0x65, 0x6e, 0x64, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x65, 0x6e, 0x64, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x68, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x73, 0x5b, 
@@ -1261,7 +1262,7 @@ const unsigned char boot_lua[] =
 	0x74, 0x6f, 0x20, 0x63, 0x6f, 0x70, 0x79, 0x20, 0x74, 0x68, 0x69, 0x73, 0x20, 0x65, 0x72, 0x72, 0x6f, 0x72, 
 	0x22, 0x0a,
 	0x09, 0x65, 0x6e, 0x64, 0x0a,
-	0x09, 0x77, 0x68, 0x69, 0x6c, 0x65, 0x20, 0x74, 0x72, 0x75, 0x65, 0x20, 0x64, 0x6f, 0x0a,
+	0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x28, 0x29, 0x0a,
 	0x09, 0x09, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x2e, 0x70, 0x75, 0x6d, 0x70, 0x28, 
 	0x29, 0x0a,
 	0x09, 0x09, 0x66, 0x6f, 0x72, 0x20, 0x65, 0x2c, 0x20, 0x61, 0x2c, 0x20, 0x62, 0x2c, 0x20, 0x63, 0x20, 0x69, 
@@ -1269,11 +1270,11 @@ const unsigned char boot_lua[] =
 	0x29, 0x20, 0x64, 0x6f, 0x0a,
 	0x09, 0x09, 0x09, 0x69, 0x66, 0x20, 0x65, 0x20, 0x3d, 0x3d, 0x20, 0x22, 0x71, 0x75, 0x69, 0x74, 0x22, 0x20, 
 	0x74, 0x68, 0x65, 0x6e, 0x0a,
-	0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x0a,
+	0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x31, 0x0a,
 	0x09, 0x09, 0x09, 0x65, 0x6c, 0x73, 0x65, 0x69, 0x66, 0x20, 0x65, 0x20, 0x3d, 0x3d, 0x20, 0x22, 0x6b, 0x65, 
 	0x79, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, 0x22, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x20, 0x3d, 0x3d, 
 	0x20, 0x22, 0x65, 0x73, 0x63, 0x61, 0x70, 0x65, 0x22, 0x20, 0x74, 0x68, 0x65, 0x6e, 0x0a,
-	0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x0a,
+	0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x31, 0x0a,
 	0x09, 0x09, 0x09, 0x65, 0x6c, 0x73, 0x65, 0x69, 0x66, 0x20, 0x65, 0x20, 0x3d, 0x3d, 0x20, 0x22, 0x6b, 0x65, 
 	0x79, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, 0x22, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x20, 0x3d, 0x3d, 
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@@ -1305,7 +1306,7 @@ const unsigned char boot_lua[] =
 	0x75, 0x74, 0x74, 0x6f, 0x6e, 0x73, 0x29, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x69, 0x66, 0x20, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, 0x20, 0x3d, 0x3d, 0x20, 
 	0x31, 0x20, 0x74, 0x68, 0x65, 0x6e, 0x0a,
-	0x09, 0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x0a,
+	0x09, 0x09, 0x09, 0x09, 0x09, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x31, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x65, 0x6c, 0x73, 0x65, 0x69, 0x66, 0x20, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, 
 	0x20, 0x3d, 0x3d, 0x20, 0x33, 0x20, 0x74, 0x68, 0x65, 0x6e, 0x0a,
 	0x09, 0x09, 0x09, 0x09, 0x09, 0x63, 0x6f, 0x70, 0x79, 0x54, 0x6f, 0x43, 0x6c, 0x69, 0x70, 0x62, 0x6f, 0x61, 
@@ -1321,15 +1322,6 @@ const unsigned char boot_lua[] =
 	0x09, 0x09, 0x65, 0x6e, 0x64, 0x0a,
 	0x09, 0x65, 0x6e, 0x64, 0x0a,
 	0x65, 0x6e, 0x64, 0x0a,
-	0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x64, 0x65, 0x66, 
-	0x65, 0x72, 0x45, 0x72, 0x72, 0x68, 0x61, 0x6e, 0x64, 0x28, 0x2e, 0x2e, 0x2e, 0x29, 0x0a,
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-	0x2e, 0x29, 0x0a,
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 	0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 
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@@ -1341,24 +1333,71 @@ const unsigned char boot_lua[] =
 	0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 
 	0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
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 }; // [boot.lua]
 } // love