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--[[
GameState - State management for ReiLua-Enhanced
Inspired by hump.gamestate for Love2D
Adapted for ReiLua-Enhanced by providing similar API
Usage:
local GameState = require("lib.gamestate")
local menu = {}
local game = {}
function menu:enter() end
function menu:update(dt) end
function menu:draw() end
GameState.registerEvents()
GameState.switch(menu)
]]
local GameState = {}
-- Current state
local current = nil
-- Stack of states for push/pop functionality
local stack = {}
-- Helper function to call state function if it exists
local function call(state, func, ...)
if state and state[func] then
return state[func](state, ...)
end
end
-- Switch to a new state
function GameState.switch(to, ...)
if current then
call(current, 'leave')
end
local pre = current
current = to
return call(current, 'enter', pre, ...)
end
-- Push current state to stack and switch to new state
function GameState.push(to, ...)
if current then
table.insert(stack, current)
end
return GameState.switch(to, ...)
end
-- Pop state from stack and return to it
function GameState.pop(...)
if #stack < 1 then
return
end
local pre = current
current = table.remove(stack)
if pre then
call(pre, 'leave')
end
return call(current, 'resume', pre, ...)
end
-- Get current state
function GameState.current()
return current
end
-- Register callbacks to RL framework
function GameState.registerEvents()
-- Override RL callbacks to forward to current state
local RL_init = RL.init
local RL_update = RL.update
local RL_draw = RL.draw
local RL_event = RL.event
local RL_exit = RL.exit
RL.init = function()
if RL_init then RL_init() end
call(current, 'init')
end
RL.update = function(dt)
if RL_update then RL_update(dt) end
call(current, 'update', dt)
end
RL.draw = function()
if RL_draw then RL_draw() end
call(current, 'draw')
end
RL.event = function(event)
if RL_event then RL_event(event) end
call(current, 'event', event)
end
RL.exit = function()
if RL_exit then RL_exit() end
call(current, 'exit')
end
end
-- State callbacks that can be implemented:
-- state:enter(previous, ...) - Called when entering state
-- state:leave() - Called when leaving state
-- state:resume(previous, ...) - Called when returning to state via pop()
-- state:init() - Called once at game start if state is initial
-- state:update(dt) - Called every frame
-- state:draw() - Called every frame for rendering
-- state:event(event) - Called on input events
-- state:exit() - Called when game exits
return GameState
|
