hump/gamestate.lua
2010-08-13 15:36:12 +02:00

78 lines
1.9 KiB
Lua

Gamestate = {}
local function __NULL__() end
-- default gamestate produces error on every callback
local function __ERROR__() error("Gamestate not initialized. Use Gamestate.switch()") end
Gamestate.current = {
enter = __ERROR__,
leave = __NULL__,
update = __ERROR__,
draw = __ERROR__,
keyreleased = __ERROR__,
keypressed = __ERROR__,
mousereleased = __ERROR__,
}
function Gamestate.new()
return {
enter = __NULL__,
leave = __NULL__,
update = __NULL__,
draw = __NULL__,
keyreleased = __NULL__,
keypressed = __NULL__,
mousereleased = __NULL__,
}
end
function Gamestate.switch(to, ...)
if not to then return end
Gamestate.current:leave()
local pre = Gamestate.current
Gamestate.current = to
Gamestate.current:enter(pre, ...)
end
local _update
function Gamestate.update(dt)
if _update then _update(dt) end
Gamestate.current:update(dt)
end
local _keypressed
function Gamestate.keypressed(key, unicode)
if _keypressed then _keyreleased(key) end
Gamestate.current:keypressed(key, unicode)
end
local _keyreleased
function Gamestate.keyreleased(key)
if _keyreleased then _keyreleased(key) end
Gamestate.current:keyreleased(key)
end
local _mousereleased
function Gamestate.mousereleased(x,y,btn)
if _mousereleased then _mousereleased(x,y,btn) end
Gamestate.current:mousereleased(x,y,btn)
end
local _draw
function Gamestate.draw()
if _draw then _draw() end
Gamestate.current:draw()
end
function Gamestate.registerEvents()
_update = love.update
love.update = Gamestate.update
_keypressed = love.keypressed
love.keypressed = Gamestate.keypressed
_keyreleased = love.keyreleased
love.keyreleased = Gamestate.keyreleased
_mousereleased = love.mousereleased
love.mousereleased = Gamestate.mousereleased
_draw = love.draw
love.draw = Gamestate.draw
end