Started implementing game states and intro.

src/classes.lua

@@ -0,0 +1,46 @@
+------------------------------------------------------------------------------
+-- Methods
+------------------------------------------------------------------------------
+
+-- Single inheritance version of the sample code from
+-- http://lua-users.org/wiki/ObjectOrientationTutorial
+local function make_class(BaseClass)
+    -- "cls" is the new class
+    local cls = {}
+
+    -- copy base class contents into the new class
+    if BaseClass ~= nil then
+        for k, v in pairs(BaseClass) do
+            cls[k] = v
+        end
+    end
+
+    -- set the class's __index, and start filling an "is_a" table that contains this class and all of its bases
+    -- so you can do an "instance of" check using my_instance.is_a[MyClass]
+    cls.__index, cls.is_a = cls, {[cls] = true}
+
+    if BaseClass ~= nil then
+        cls.is_a[BaseClass] = true
+    end
+
+    -- the class's __call metamethod
+    setmetatable(cls, {__call = function (c, ...)
+        local instance = setmetatable({}, c)
+
+        -- run the init method if it's there
+        local init = instance._init
+
+        if init then init(instance, ...) end
+        return instance
+    end})
+
+    -- return the new class table, that's ready to fill with methods
+    return cls
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return make_class

src/gstate.lua

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+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local make_class = require 'src.classes'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local GameState = make_class()
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function GameState:_init(name, index)
+    self.name = name
+    self.index = index
+    self.valid = false
+end
+
+
+function GameState:load()
+end
+
+
+function GameState:update(_)
+    return self.index
+end
+
+
+function GameState:draw()
+end
+
+
+function GameState:unload()
+end
+
+function GameState:keypressed(_)
+end
+
+
+function GameState:mousemoved(_, _)
+end
+
+
+function GameState:mousepressed(_, _, _)
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return GameState

src/intro.lua

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+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local love = require 'love'
+local make_class = require 'src.classes'
+local GameState = require 'src.gstate'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Intro = make_class(GameState)
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Intro:_init(name, index)
+    -- Call super-class constructor.
+    GameState._init(self, name, index)
+
+    -- Attribute definitions
+    self.skip = false
+end
+
+
+function Intro:load()
+    self.background = love.graphics.newImage('imgs/cpu.png')
+    self.valid = true
+end
+
+
+function Intro:update(_)
+    if not self.skip then return self.index else return 0 end
+end
+
+
+function Intro:draw()
+    if self.valid then
+        love.graphics.draw(self.background, 0, 0)
+        love.graphics.print(string.format('OS: %s', love.system.getOS()), 5, 5)
+        love.graphics.print(string.format('Love version: %s', love.getVersion()), 5, 15)
+        love.graphics.print(string.format('Memory usage: %s KiB', love.system.getMemUsage()), 5, 25)
+    end
+end
+
+
+function Intro:unload()
+    self.background = nil
+    self.valid = false
+end
+
+
+function Intro:keypressed(_)
+    self.skip = true
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Intro

src/states.lua

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+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local Intro = require 'src.intro'
+
+
+------------------------------------------------------------------------------
+-- Variables
+------------------------------------------------------------------------------
+
+-- Table of all valid game states.
+local states = {
+    Intro('intro', 1),
+}
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return states